A salp bloom (Tunicata, Thaliacea) along the Apulian coast and in the Otranto Channel between March-May 2013

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Citizen records were substantiated with field inspections along the coast and during an oceanographic campaign in the Otranto Channel.Salps clogged nets, impairing fishing activities along the coast. Swimmers were scared by the gelatinous appearance of the salps, and thought they were jellyfish. At the end of the bloom the dead bodies of the colonies, that were up to 6-7 m long, were accumulated along the coast and stirred by the waves, forming foams along dozens of kilometers of coast. The bloom also occurred at the Tremiti Islands, north of the Gargano Peninsula. The possible impacts of such events on the functioning of pelagic systems are discussed." } { "@context": "http://schema.org", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": "1", "item": { "@id": "https://f1000research.com/", "name": "Home" } }, { "@type": "ListItem", "position": "2", "item": { "@id": "https://f1000research.com/browse/articles", "name": "Browse" } }, { "@type": "ListItem", "position": "3", "item": { "@id": "https://f1000research.com/articles/2-181/v1", "name": "A salp bloom (Tunicata, Thaliacea) along the Apulian coast and in..." } } ] } Home Browse A salp bloom (Tunicata, Thaliacea) along the Apulian coast and in... ALL Metrics - Views Downloads Get PDF Get XML Cite How to cite this article Boero F, Belmonte G, Bracale R et al. A salp bloom (Tunicata, Thaliacea) along the Apulian coast and in the Otranto Channel between March-May 2013 [version 1; peer review: 2 approved] . F1000Research 2013, 2 :181 ( https://doi.org/10.12688/f1000research.2-181.v1 ) NOTE: If applicable, it is important to ensure the information in square brackets after the title is included in all citations of this article. Close Copy Citation Details Export Export Citation Sciwheel EndNote Ref. Manager Bibtex ProCite Sente EXPORT Select a format first Track Share ▬ ✚ Observation Article A salp bloom (Tunicata, Thaliacea) along the Apulian coast and in the Otranto Channel between March-May 2013 [version 1; peer review: 2 approved] Ferdinando Boero 1,2 , Genuario Belmonte 1 , Roberta Bracale 1 , Simonetta Fraschetti 1 , Stefano Piraino 1 , Serena Zampardi 1 Ferdinando Boero 1,2 , Genuario Belmonte 1 , [...] Roberta Bracale 1 , Simonetta Fraschetti 1 , Stefano Piraino 1 , Serena Zampardi 1 PUBLISHED 10 Sep 2013 Author details Author details 1 Universita' del Salento, DiSTeBA, 73100 Lecce, Italy 2 National Research Council, Institute of Marine Sciences, 16149 Genoa, Italy OPEN PEER REVIEW DETAILS REVIEWER STATUS Abstract Between March-May 2013 a massive Salpa maxima bloom was recorded by a citizen science study along the Ionian and Adriatic coast of the Salento peninsula (Italy). Citizen records were substantiated with field inspections along the coast and during an oceanographic campaign in the Otranto Channel. Salps clogged nets, impairing fishing activities along the coast. Swimmers were scared by the gelatinous appearance of the salps, and thought they were jellyfish. At the end of the bloom the dead bodies of the colonies, that were up to 6-7 m long, were accumulated along the coast and stirred by the waves, forming foams along dozens of kilometers of coast. The bloom also occurred at the Tremiti Islands, north of the Gargano Peninsula. The possible impacts of such events on the functioning of pelagic systems are discussed. READ ALL READ LESS Corresponding Author(s) Ferdinando Boero ( [email protected] ) Close Corresponding author: Ferdinando Boero Competing interests: No competing interests were disclosed. Grant information: These observations were made while working at a series of projects financed by the European Union and the Italian Ministry of Research (RITMARE, COCONET, VECTORS OF CHANGE, MED-JELLYRISK, PERSEUS, PRIN). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. Copyright: © 2013 Boero F et al . This is an open access article distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Data associated with the article are available under the terms of the Creative Commons Zero "No rights reserved" data waiver (CC0 1.0 Public domain dedication). How to cite: Boero F, Belmonte G, Bracale R et al. A salp bloom (Tunicata, Thaliacea) along the Apulian coast and in the Otranto Channel between March-May 2013 [version 1; peer review: 2 approved] . F1000Research 2013, 2 :181 ( https://doi.org/10.12688/f1000research.2-181.v1 ) First published: 10 Sep 2013, 2 :181 ( https://doi.org/10.12688/f1000research.2-181.v1 ) Latest published: 10 Sep 2013, 2 :181 ( https://doi.org/10.12688/f1000research.2-181.v1 ) Observation The phylum Chordata is divided into three subphyla, the invertebrate Tunicata and Cephalochordata, and the vertebrate Vertebrata. The tunicates comprise the popular class Ascidiacea, the sea squirts, the inconspicuous Appendicularia and Sorberacea, and the conspicuous Thaliacea. Thaliaceans are mostly planktonic and are part of gelatinous macrozooplankton (Bone, 1998) 1 . They are usually open water animals and are rarely seen from the shore. They are filter feeders and their colonies can become rather big, reaching several metres in length. Salps are colonial thaliacea thriving in all oceans, their chains of zooids can be very conspicuous. During the spring of 2013, a citizen science study ( http://meteomeduse.focus.it/ ), aimed at documenting the presence of gelatinous plankton in Italian waters (Boero 2013a) 2 , recorded about sixty sightings of Salpa maxima Forskål, 1775. The first, scattered records of salps arrived from the Apulian coasts in March 2013. Records increased in April and reached a peak in May. In April-May 2013, some of the authors had several chances to document the bloom, from both the coast (FB, RB, SF, SP), and from an oceanographic vessel (GB) during a cruise for the project CoCoNet ( http://www.coconet-fp7.eu/ ), between 8–21 May 2013. In mid-May 2013 the colonies experienced massive degeneration and, in the following days, became stirred and stranded along parts of the Apulian coast where they formed foam belts, each several kilometers long. Figure 1 shows the distribution of the highest number of recorded salp chains of the citizen science study and of original observations by the authors in the first half of May, 2013. Figure 1 also shows the records of salp chains at stations of the CoCoNet cruise in the Otranto Channel. Dozens of colonies were visible from a single point of observation and, while moving, the same pattern persisted in a rather homogeneous fashion, leading to the perception of a single, large bloom, probably involving several million individuals. The bloom was more apparent from the coast, since the colonies were concentrated by the wind and currents, whereas in the open sea they were more scattered. Figure 1. The peak of salp presence (early May 2013) along the Apulian coast. Coastal presences from both citizen science records and authors’ own observations were aggregated with the software Fishery Analyst, offshore records derive from onship observations during the CoCoNet Cruise. Yellow lines: trajectories of the main currents. The colonies were impressively long ( Figure 2 ) reaching up to 6–7 m in length and were seen by hundreds of people, including fishermen, who alerted the local authorities. At the end of the bloom, in mid-May 2013, the dissolving colonies were seen along the whole coast of the Salento pensinsula (the southernmost part of Apulia) ( Figure 3 ). Figure 2. A chain of Salpa maxima in the waters of Salento. Picture by R. Bracale. Figure 3. The fragments of salp chains, at the end of the bloom. Picture by S. Fraschetti. Merging the citizen science records with our direct observations from the coast and onboard the CoCoNet cruise, it is clear that the bloom was not a localized event, and that it characterized the plankton of a vast body of water for a prolonged period of time. During the same period of the reported bloom, citizens delivered just one salp record from the northern Adriatic and four from the Ligurian Sea, even though citizens sent many records of other gelatinous plankters, mostly jellyfish. The small number of salp records, and the massive presence of other gelatinous plankters along the whole coast of Italy (more than 5000 records from March to August 2013), are rather strong indications that salps were rare elsewhere beyond the Apulian coast. Since salp colonies ranged between 2 and 6–7 m in length, it is rather unlikely that organisms of that size might have passed unnoticed while much less conspicuous gelatinous plankters had been recorded. The public reaction Many people thought that salps were jellyfish. Ocean literacy is rather limited, and very few people know what a salp is. People took pictures of them and reports started to appear in the local media, from local televisions to local newspapers and web sites. Eventually, the news reached the national press as well, with mentions in magazines such as Internazionale and Venerdì di Repubblica . A picture of a large colony, taken during a field inspection, became rather popular and was published several times ( Figure 2 ). Fishermen started to complain, because their nets were clogged and they could not operate. They documented the events with pictures, to support their requests of compensation. The foam formed at the end of the bloom was at first attributed to a massive malfunction of sewage treatment plants, inexplicably occurring simultaneously in several plants that are independent of each other. The local media covered this event with some alarm. F. Boero made several interventions on local TVs and newspapers, explaining the reason of the appearance of the foam in such a wide area. Why a salp bloom can be important Salps are gelatinous filter feeders; they are usually rather rare in Apulian waters, especially in coastal waters, and decades can pass without any salp observations. Records of salps in the scientific literature are rather scant, suggesting a similar pattern of occurrence also elsewhere. On June 5th 1998, F. Boero saw a bloom similar to the present one while crossing the Adriatic sea from Dubrovnick to Bari. During the six-hour journey, salps were constantly present in high densities, forming chains whose estimated length was 5–6 m. No report of that event was ever published. On that occasion, however, the colonies did not reach the coast, and remained off shore, with only relatively low quantities being washed ashore (the majority of them had ended their life cycle while sinking to the bottom). The attention the 2013 salp bloom received in the media suggests that it is not likely that events of this magnitude occurred often in the past, since they would have been covered by the media as well. The surprise expressed by lay people and fishermen, indicates that, even if people are used to jellyfish, they are not used to salps, and the reason is simple: salps are rarely encountered in Italian waters. Such conspicuous animals do not pass unnoticed, and if they are around they are seen and recorded. Salps have extremely high clearing rates and can feed on all sizes of phytoplankton, from viruses to protists, competing with crustacean filter feeders (Bone, 1998) 1 . The presence of a massive bloom of salps likely depletes phytoplankton production, impairing the phytoplankton-crustacea-fish larvae and juveniles pathway (see Boero et al. 2008) 3 . The match of fish recruitment with a salp proliferation, could lead to a decrease in fish reproductive success due to food depletion. If this phenomemon was not reported, it could result in fishery scientists who, after a few months, might record anomalies in the age classes of some fish species while being unable to link them to any particular cause. Since salps tend to disgregate and precipitate as marine snow, they tend to fuel the detritus food chain on the sea bottom. Salp blooms, thus, might redirect the functioning of marine ecosystems in a sudden and dramatic way, leaving little evidence of the cause of changes that, indeed, might become apparent long after the end of the bloom. As remarked by Boero (2013 b) 4 , the availability of records of unusual events such as this salp proliferation, might help us to understand anomalies in the population structure of some species or even anomalies in the functioning of whole ecosystems. Predictability of salp blooms Deibel and Paffenhöfer (2009) 5 , whilst analysing a long time series of plankton records, identified a correlation between specific oceanographic conditions and the occurrence of thaliacean blooms, especially in correspondence with eddies, since these currents presumably concentrate salps. The area where the presently recorded salp bloom occurred is, indeed, characterized by a large gyre ( Figure 1 ). The current that flows along the Italian coast, and outflows from the Adriatic into the Ionian Sea is compensated by an inflow current that brings Ionian waters into the Adriatic sea on the East coast of the Adriatic (i.e. Greece, Albania, Montenegro, Bosnia and Croatia). These two opposite currents often generate a gyre in the Southern Adriatic, connecting the Eastern Adriatic coast to the Western one, immediately below the Gargano Peninsula, whereas, in correspondence of the Otranto Channel, a current connects the Italian Adriatic coast to the Albanian coast. The salp bloom, however, was also recorded at the Tremiti Islands, north of the Gargano Peninsula, and along the Ionian coast of the Salento Peninsula (e.g. Porto Cesareo) so outside the southern Adriatic gyre. Unfortunately, this area of the Adriatic is not systematically monitored for gelatinous plankton blooms, so the regularities identified by Deibel and Paffenhöfer (2009) 5 , which occured along the Atlantic coast of the USA, cannot be searched for in Adriatic historical records. Licandro et al. (2006) 6 , however, identified some correlations between hydrographic conditions and thaliacean presence along the Mediterranean coast of France, thus showing that the presence of thaliacean blooms is far from rare, under a given set of conditions, in spite of the scantiness of records. Both Licandro et al. (2006) 6 and Deibel and Paffenhöfer (2009) 5 ascribed the occurrence of thaliacean blooms to the occurrence of a given set of abiotic conditions, disregarding biotic interactions. Gelatinous plankton, ecosystem functioning and natural history Thaliacean specialists, as Bone (1998) 1 summarized, concur that the ecological role of pelagic tunicates is much underestimated in plankton studies and that their impact on ecosystem functioning is much larger than commonly perceived. The functioning of planktonic ecosystems is one of the most important ecological processes on the planet both in terms of oxygen production and as a carbon sink. The whole functioning of what is commonly called “nekton” (e.g. marine vertebrates and large squids), furthermore, depends on phytoplankton primary production and on the efficiency of energy transfer by grazers such as crustaceans or, as in this case, thaliaceans. The presences of gelatinous plankton species, either carnivorous (jellyfish and ctenophores) or herbivorous (thaliaceans), commonly occurs in pulses that are almost invariably perceived as episodic and irregular events (Boero et al. 2008) 3 and so considered of negligible importance. This perception is simply wrong and, as Ricklefs (2012) 7 convincingly showed, the understanding of the functioning of ecosystems would gain much from the practicing of natural history. Regularities, such as the massive presence of crustacean plankton after phytoplankton blooms, do greatly attract ecologists, whereas irregularities such as gelatinous plankton blooms that, usually, are of short duration and might even be overlooked by standard monitorings, tend to be disregarded. If only regularities were responsible of the functioning of ecological systems, however, there would be no change. Irregularities are the motor of change and cannot be considered as negligible freaks, they are, instead, the key for the understanding of change, i.e. of the history of natural systems. Author contributions F. Boero coordinated the citizen science study and wrote the article G. Belmonte made the onboard observations during the CoCoNet cruise R. Bracale made observations along the Adriatic coast and the picture in Figure 2 S. Fraschetti made observations along the Ionian coast and the picture in Figure 3 S. Piraino made observations along the Adriatic and Ionian coast S. Zampardi collected the citizen science observations, treated the data with the software fishery analyst and produced the map in Figure 1 All authors critically revised the manuscript and approved it for publication. Competing interests No competing interests were disclosed. Grant information These observations were made while working at a series of projects financed by the European Union and the Italian Ministry of Research (RITMARE, COCONET, VECTORS OF CHANGE, MED-JELLYRISK, PERSEUS, PRIN). Acknowledgements Fabio Tresca produced Figure 1 ; Paolo D’Ambrosio and Sergio Fai helped in treating citizen science data with Fishery Analyst ( http://www.mappamondogis.it/fisheryanalystonline.htm ). Faculty Opinions recommended References 1. Bone Q: The biology of pelagic tunicates. Oxford: Oxford University Press, 1998. Reference Source 2. Boero F: Review of jellyfish blooms in the Mediterranean and Black Sea. GFCM Studies and Reviews. 2013a; 92 : 53pp. Reference Source 3. Boero F, Bouillon J, Gravili C, et al. : Gelatinous plankton: irregularities rule the world (sometimes). Mar Ecol Progr Ser. 2008; 356 : 299–310. Publisher Full Text 4. Boero F: Observational articles: a tool to reconstruct ecological history based on chronicling unusual events [v1; ref status: indexed, http://f1000r.es/1kg ] F1000Research. 2013b; 2 . : 168. Publisher Full Text 5. Deibel D, Paffenhöfer GA: Predictability of patches of neritic salps and doliolids (Tunicata, Thaliacea). Journ Plankton Res. 2009; 31 : 1571–1579. Publisher Full Text 6. Licandro P, Ibanez F, Etienne M: Long-term fluctuations (1974–1999) of the salps Thalia democratica and Salpa fusiformis in the Northwestern Mediterranean Sea: relationships with hydroclimatic variability. Limnol Oceanogr. 2006; 51 : 1832–1848. Publisher Full Text 7. Ricklefs RE: Naturalists, natural history, and the nature of biological diversity. Am Nat. 2012; 179 (4): 423–35. PubMed Abstract | Publisher Full Text Comments on this article Comments (0) Version 1 VERSION 1 PUBLISHED 10 Sep 2013 ADD YOUR COMMENT Comment Author details Author details 1 Universita' del Salento, DiSTeBA, 73100 Lecce, Italy 2 National Research Council, Institute of Marine Sciences, 16149 Genoa, Italy Competing interests No competing interests were disclosed. Grant information These observations were made while working at a series of projects financed by the European Union and the Italian Ministry of Research (RITMARE, COCONET, VECTORS OF CHANGE, MED-JELLYRISK, PERSEUS, PRIN). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. Article Versions (1) version 1 Published: 10 Sep 2013, 2:181 https://doi.org/10.12688/f1000research.2-181.v1 Copyright © 2013 Boero F et al . This is an open access article distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Data associated with the article are available under the terms of the Creative Commons Zero "No rights reserved" data waiver (CC0 1.0 Public domain dedication). Download Export To Sciwheel Bibtex EndNote ProCite Ref. Manager (RIS) Sente metrics Views Downloads F1000Research - - PubMed Central info_outline Data from PMC are received and updated monthly. - - Citations open_in_new 0 open_in_new 0 open_in_new SEE MORE DETAILS CITE how to cite this article Boero F, Belmonte G, Bracale R et al. A salp bloom (Tunicata, Thaliacea) along the Apulian coast and in the Otranto Channel between March-May 2013 [version 1; peer review: 2 approved] . F1000Research 2013, 2 :181 ( https://doi.org/10.12688/f1000research.2-181.v1 ) NOTE: If applicable, it is important to ensure the information in square brackets after the title is included in all citations of this article. COPY CITATION DETAILS track receive updates on this article Track an article to receive email alerts on any updates to this article. TRACK THIS ARTICLE Share Open Peer Review Current Reviewer Status: ? Key to Reviewer Statuses VIEW HIDE Approved The paper is scientifically sound in its current form and only minor, if any, improvements are suggested Approved with reservations A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit. Not approved Fundamental flaws in the paper seriously undermine the findings and conclusions Version 1 VERSION 1 PUBLISHED 10 Sep 2013 Views 0 Cite How to cite this report: Licandro P. Reviewer Report For: A salp bloom (Tunicata, Thaliacea) along the Apulian coast and in the Otranto Channel between March-May 2013 [version 1; peer review: 2 approved] . F1000Research 2013, 2 :181 ( https://doi.org/10.5256/f1000research.2180.r1768 ) The direct URL for this report is: https://f1000research.com/articles/2-181/v1#referee-response-1768 NOTE: it is important to ensure the information in square brackets after the title is included in this citation. Close Copy Citation Details Reviewer Report 27 Sep 2013 Priscilla Licandro , Sir Alister Hardy Foundation for Ocean Science (SAHFOS), Plymouth, UK Approved VIEWS 0 https://doi.org/10.5256/f1000research.2180.r1768 This is an interesting and well written article, which reports a large bloom of gelatinous plankton (i.e. salps) observed in Spring 2013 along the Apulian coast (southern Adriatic). Such an exceptional event, which occurred for more than 2 ... Continue reading READ ALL This is an interesting and well written article, which reports a large bloom of gelatinous plankton (i.e. salps) observed in Spring 2013 along the Apulian coast (southern Adriatic). Such an exceptional event, which occurred for more than 2 months over a very large region, likely had a significant impact on the functioning of the marine ecosystem of the southern Adriatic, in particular on the proportion of sinking carbon as opposed to the carbon transferred across the pelagic food web. Records of salp blooms are quite scant in the literature. For various reasons gelatinous zooplankton have been often overlooked so that, as rightly mentioned by the authors, blooms such as this have likely occurred but not been reported in the past. Citizen science records, used in this study, have the advantage of providing real time information over a large spatial scale, a scale which is not covered by any monitoring program ongoing around the southern Adriatic or in other regions of the Mediterranean. Even though those records are not always rigorous measurements, and should be considered with care, I recommend that the authors provide more information on the range of Salpa maxima abundance observed in Spring 2013. Ranges of abundance (i.e. 1000) available from the online portal http://meteomeduse.focus.it/ and similar - if not more precise information from the CoCoNet cruise - should be indicated, as they might enable researchers to assess whether S. maxima swarms were evenly distributed inshore and offshore, or whether they were instead concentrated in a particular area. I suggest some amendments in the text (see below for details), to clarify that salps are commonly found in Italian waters (see for instance the time series off Chiavari (Ligurian Sea) in Licandro & Ibanez, 2000 and off Naples (Tyrrhenian Sea) in Mazzocchi et al., 2011 ), although salp blooms are not regular events. In particular Salpa maxima, as well as other species of salps, had been previously found in the southern Adriatic (see ‘Checklist of the Flora and Fauna in Italian Seas-II’, 2010, Biologia Marina Mediterranea, Vol 17 (suppl.1)). The authors might want to mention that records of salps available in other regions of the southern Adriatic (e.g. Lokrum, the monitoring station off Dubrovnik, where gelatinous plankton has been regularly sampled every month since the mid-1990s) could possibly provide background information, to clarify the recurrence of salp blooms in the southern Adriatic and the environmental conditions associated with those events. Detailed comments: Fig. 1 - I suggest indicating the average range of Salpa maxima abundance using, if necessary, different colours for different classes of abundance. First paragraph, page 4 - I suggest the following modification: "The small number of salp records, and the massive presence of other gelatinous plankters along the whole coast of Italy (...) suggest that salps were rare elsewhere beyond the Apulian coast..." Fourth paragraph, page 4 - I suggest the following modification: “Salps are gelatinous filter-feeders; they tend to be less abundant in Apulian waters..” Fifth paragraph, page 4 - I suggest the following modification: “ ..blooms of salps are not regularly encountered in Italian waters..” Competing Interests: No competing interests were disclosed. I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard. Close READ LESS CITE CITE HOW TO CITE THIS REPORT Licandro P. Reviewer Report For: A salp bloom (Tunicata, Thaliacea) along the Apulian coast and in the Otranto Channel between March-May 2013 [version 1; peer review: 2 approved] . F1000Research 2013, 2 :181 ( https://doi.org/10.5256/f1000research.2180.r1768 ) The direct URL for this report is: https://f1000research.com/articles/2-181/v1#referee-response-1768 NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article. COPY CITATION DETAILS Report a concern Respond or Comment COMMENT ON THIS REPORT Views 0 Cite How to cite this report: Mills C. Reviewer Report For: A salp bloom (Tunicata, Thaliacea) along the Apulian coast and in the Otranto Channel between March-May 2013 [version 1; peer review: 2 approved] . F1000Research 2013, 2 :181 ( https://doi.org/10.5256/f1000research.2180.r1771 ) The direct URL for this report is: https://f1000research.com/articles/2-181/v1#referee-response-1771 NOTE: it is important to ensure the information in square brackets after the title is included in this citation. Close Copy Citation Details Reviewer Report 26 Sep 2013 Claudia Mills , Department of Biology, University of Washington, Seattle, WA, USA Approved VIEWS 0 https://doi.org/10.5256/f1000research.2180.r1771 Salp blooms are medium-scale oceanographic events that happen normally throughout the world oceans. We can only appreciate the regularity, extent, and significance of these events if there is a record of their occurrence. This paper localizes an extensive salp bloom ... Continue reading READ ALL Salp blooms are medium-scale oceanographic events that happen normally throughout the world oceans. We can only appreciate the regularity, extent, and significance of these events if there is a record of their occurrence. This paper localizes an extensive salp bloom in time and space along the Apulian coast, and also mentions a single anecdotal observation of an unrecorded bloom in the same area in 1998, giving us perhaps an idea of the rarity of such an event. Competing Interests: No competing interests were disclosed. I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard. Close READ LESS CITE CITE HOW TO CITE THIS REPORT Mills C. Reviewer Report For: A salp bloom (Tunicata, Thaliacea) along the Apulian coast and in the Otranto Channel between March-May 2013 [version 1; peer review: 2 approved] . F1000Research 2013, 2 :181 ( https://doi.org/10.5256/f1000research.2180.r1771 ) The direct URL for this report is: https://f1000research.com/articles/2-181/v1#referee-response-1771 NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article. COPY CITATION DETAILS Report a concern Respond or Comment COMMENT ON THIS REPORT Comments on this article Comments (0) Version 1 VERSION 1 PUBLISHED 10 Sep 2013 ADD YOUR COMMENT Comment keyboard_arrow_left keyboard_arrow_right Open Peer Review Reviewer Status info_outline Alongside their report, reviewers assign a status to the article: Approved The paper is scientifically sound in its current form and only minor, if any, improvements are suggested Approved with reservations A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit. Not approved Fundamental flaws in the paper seriously undermine the findings and conclusions Reviewer Reports Invited Reviewers 1 2 Version 1 10 Sep 13 read read Claudia Mills , University of Washington, Seattle, WA, USA Priscilla Licandro , Sir Alister Hardy Foundation for Ocean Science (SAHFOS), Plymouth, UK Comments on this article All Comments (0) Add a comment Sign up for content alerts Sign Up You are now signed up to receive this alert Browse by related subjects keyboard_arrow_left Back to all reports Reviewer Report 0 Views copyright © 2013 Licandro P. This is an open access peer review report distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. 27 Sep 2013 | for Version 1 Priscilla Licandro , Sir Alister Hardy Foundation for Ocean Science (SAHFOS), Plymouth, UK 0 Views copyright © 2013 Licandro P. This is an open access peer review report distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. format_quote Cite this report speaker_notes Responses (0) Approved info_outline Alongside their report, reviewers assign a status to the article: Approved The paper is scientifically sound in its current form and only minor, if any, improvements are suggested Approved with reservations A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit. Not approved Fundamental flaws in the paper seriously undermine the findings and conclusions This is an interesting and well written article, which reports a large bloom of gelatinous plankton (i.e. salps) observed in Spring 2013 along the Apulian coast (southern Adriatic). Such an exceptional event, which occurred for more than 2 months over a very large region, likely had a significant impact on the functioning of the marine ecosystem of the southern Adriatic, in particular on the proportion of sinking carbon as opposed to the carbon transferred across the pelagic food web. Records of salp blooms are quite scant in the literature. For various reasons gelatinous zooplankton have been often overlooked so that, as rightly mentioned by the authors, blooms such as this have likely occurred but not been reported in the past. Citizen science records, used in this study, have the advantage of providing real time information over a large spatial scale, a scale which is not covered by any monitoring program ongoing around the southern Adriatic or in other regions of the Mediterranean. Even though those records are not always rigorous measurements, and should be considered with care, I recommend that the authors provide more information on the range of Salpa maxima abundance observed in Spring 2013. Ranges of abundance (i.e. 1000) available from the online portal http://meteomeduse.focus.it/ and similar - if not more precise information from the CoCoNet cruise - should be indicated, as they might enable researchers to assess whether S. maxima swarms were evenly distributed inshore and offshore, or whether they were instead concentrated in a particular area. I suggest some amendments in the text (see below for details), to clarify that salps are commonly found in Italian waters (see for instance the time series off Chiavari (Ligurian Sea) in Licandro & Ibanez, 2000 and off Naples (Tyrrhenian Sea) in Mazzocchi et al., 2011 ), although salp blooms are not regular events. In particular Salpa maxima, as well as other species of salps, had been previously found in the southern Adriatic (see ‘Checklist of the Flora and Fauna in Italian Seas-II’, 2010, Biologia Marina Mediterranea, Vol 17 (suppl.1)). The authors might want to mention that records of salps available in other regions of the southern Adriatic (e.g. Lokrum, the monitoring station off Dubrovnik, where gelatinous plankton has been regularly sampled every month since the mid-1990s) could possibly provide background information, to clarify the recurrence of salp blooms in the southern Adriatic and the environmental conditions associated with those events. Detailed comments: Fig. 1 - I suggest indicating the average range of Salpa maxima abundance using, if necessary, different colours for different classes of abundance. First paragraph, page 4 - I suggest the following modification: "The small number of salp records, and the massive presence of other gelatinous plankters along the whole coast of Italy (...) suggest that salps were rare elsewhere beyond the Apulian coast..." Fourth paragraph, page 4 - I suggest the following modification: “Salps are gelatinous filter-feeders; they tend to be less abundant in Apulian waters..” Fifth paragraph, page 4 - I suggest the following modification: “ ..blooms of salps are not regularly encountered in Italian waters..” Competing Interests No competing interests were disclosed. I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard. reply Respond to this report Responses (0) Licandro P. Peer Review Report For: A salp bloom (Tunicata, Thaliacea) along the Apulian coast and in the Otranto Channel between March-May 2013 [version 1; peer review: 2 approved] . F1000Research 2013, 2 :181 ( https://doi.org/10.5256/f1000research.2180.r1768) NOTE: it is important to ensure the information in square brackets after the title is included in this citation. The direct URL for this report is: https://f1000research.com/articles/2-181/v1#referee-response-1768 keyboard_arrow_left Back to all reports Reviewer Report 0 Views copyright © 2013 Mills C. This is an open access peer review report distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. 26 Sep 2013 | for Version 1 Claudia Mills , Department of Biology, University of Washington, Seattle, WA, USA 0 Views copyright © 2013 Mills C. This is an open access peer review report distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. format_quote Cite this report speaker_notes Responses (0) Approved info_outline Alongside their report, reviewers assign a status to the article: Approved The paper is scientifically sound in its current form and only minor, if any, improvements are suggested Approved with reservations A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit. Not approved Fundamental flaws in the paper seriously undermine the findings and conclusions Salp blooms are medium-scale oceanographic events that happen normally throughout the world oceans. We can only appreciate the regularity, extent, and significance of these events if there is a record of their occurrence. This paper localizes an extensive salp bloom in time and space along the Apulian coast, and also mentions a single anecdotal observation of an unrecorded bloom in the same area in 1998, giving us perhaps an idea of the rarity of such an event. Competing Interests No competing interests were disclosed. I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard. reply Respond to this report Responses (0) Mills C. Peer Review Report For: A salp bloom (Tunicata, Thaliacea) along the Apulian coast and in the Otranto Channel between March-May 2013 [version 1; peer review: 2 approved] . F1000Research 2013, 2 :181 ( https://doi.org/10.5256/f1000research.2180.r1771) NOTE: it is important to ensure the information in square brackets after the title is included in this citation. The direct URL for this report is: https://f1000research.com/articles/2-181/v1#referee-response-1771 Alongside their report, reviewers assign a status to the article: Approved - the paper is scientifically sound in its current form and only minor, if any, improvements are suggested Approved with reservations - A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit. Not approved - fundamental flaws in the paper seriously undermine the findings and conclusions Adjust parameters to alter display View on desktop for interactive features Includes Interactive Elements View on desktop for interactive features Competing Interests Policy Provide sufficient details of any financial or non-financial competing interests to enable users to assess whether your comments might lead a reasonable person to question your impartiality. 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