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Temperature loggers on Madagascar's Salary Reef revealed that intertidal gleaning habitats experience extreme thermal stress, particularly during transitional seasons due to midday low tides, indicating uneven and seasonally distinct thermal risks for local fisheries.
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by claude@2026-07, 2026-07-16
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This preprint studied thermal microclimates across different reef geomorphic zones on Salary Reef, southwestern Madagascar, where fishing is spatially structured and includes women and children gleaning in intertidal habitats during low tide. The authors deployed temperature loggers for over a year and analyzed modeled tide elevation, finding that subtidal zones had similar mean temperatures but diverged substantially in the number of cumulative hours above 30 °C, while logger data showed higher extremes and lower minima than gridded datasets. Intertidal gleaning habitats experienced extreme thermal stress reaching 48.8 °C, with the highest heat events occurring in transitional “shoulder” seasons driven by midday low tides. This paper does not explicitly discuss endometriosis or adenomyosis; it was included in the corpus via a keyword match in the upstream search index.
Abstract
Climate change poses an understudied threat to the coastal reef systems of the Western Indian Ocean (WIO), a biodiversity hotspot critical for the maintenance of subsistence fisheries. The southwestern coast of Madagascar is especially sensitive to disturbances due to the high level of socioecological dependence on functioning reefs. Fishing in this region is spatially structured. For example, gleaning (pêche-à-pied) is undertaken predominantly by women and children walking in intertidal reef flat and crest habitats during low tide, while boat-based fishing occurs across a range of reef geomorphic zones. These zones may experience different microclimates due to differences in depth, water residence time, and oceanic exposure. To characterize the thermal microclimates of these zones, we deployed temperature loggers for over a year across reef geomorphic zones on Salary Reef, Madagascar. We further examined modeled tide elevation data over the deployment period and the 18.6-year tidal cycle. Subtidal loggers showed similar mean temperature but diverged up to 27% in cumulative hours above 30 °C. Compared with gridded temperature datasets, logger observations revealed higher extremes and lower minima, underscoring the added fidelity of in-situ measurements. The intertidal logger recorded extreme thermal stress (up to 48.8 °C) in gleaning habitats, with maximum heat events occurring in transitional “shoulder” seasons rather than peak summer. Tidal analyses showed that midday low tides in these transitional periods drive extreme intertidal warming. Fisheries in Madagascar will likely experience uneven and seasonally distinct thermal risks. Climate adaptation must consider how microclimate variability mediates socioecological vulnerability in coastal oceans.
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This is a Preprint and has not been peer reviewed. This is version 2 of this Preprint.
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Climate change poses an understudied threat to the coastal reef systems of the Western Indian Ocean (WIO), a biodiversity hotspot critical for the maintenance of subsistence fisheries. The southwestern coast of Madagascar is especially sensitive to disturbances due to the high level of socioecological dependence on functioning reefs. Fishing in this region is spatially structured. For example, gleaning (pêche-à-pied) is undertaken predominantly by women and children walking in intertidal reef flat and crest habitats during low tide, while boat-based fishing occurs across a range of reef geomorphic zones. These zones may experience different microclimates due to differences in depth, water residence time, and oceanic exposure. To characterize the thermal microclimates of these zones, we deployed temperature loggers for over a year across reef geomorphic zones on Salary Reef, Madagascar. We further examined modeled tide elevation data over the deployment period and the 18.6-year tidal cycle. Subtidal loggers showed similar mean temperature but diverged up to 27% in cumulative hours above 30 °C. Compared with gridded temperature datasets, logger observations revealed higher extremes and lower minima, underscoring the added fidelity of in-situ measurements. The intertidal logger recorded extreme thermal stress (up to 48.8 °C) in gleaning habitats, with maximum heat events occurring in transitional “shoulder” seasons rather than peak summer. Tidal analyses showed that midday low tides in these transitional periods drive extreme intertidal warming. Fisheries in Madagascar will likely experience uneven and seasonally distinct thermal risks. Climate adaptation must consider how microclimate variability mediates socioecological vulnerability in coastal oceans.
https://doi.org/10.32942/X2CW68
Aquaculture and Fisheries Life Sciences, Marine Biology, Oceanography and Atmospheric Sciences and Meteorology
marine microclimate, fisheries climate sensitivity, Western Indian Ocean, reef flats, gleaning, Marine Heatwaves, Madagascar
Published: 2025-09-10 14:45
Last Updated: 2025-09-15 05:38
CC-By Attribution-ShareAlike 4.0 International
Conflict of interest statement:
The authors declare no conflicts of interest
Data and Code Availability Statement:
Data and code are available at: https://github.com/villesci/marine_mada_microclim/tree/main
Language:
English
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