Thermal sensitivity of the crab Neosarmatium africanum in tropical and temperate mangroves on the east coast of Africa
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Mangrove forests are amongst the tropical marine ecosystems most severely affected by rapid environmental change, and the activities of key associated macrobenthic species contribute to their ecological resilience. Along the east coast of Africa, the amphibious sesarmid crab Neosarmatium africanum (=meinerti) plays a pivotal role in mangrove ecosystem functioning through carbon cycling and sediment bioturbation. In the face of rapid climate change, identifying the sensitivity and vulnerability to global warming of this species is of increasing importance. Based on a latitudinal comparison, we measured the thermal sensitivity of a tropical and a temperate population of N. africanum, testing specimens at the centre and southern limit of its distribution, respectively. We measured metabolic oxygen consumption and haemolymph dissolved oxygen content during air and water breathing within a temperature range that matched the natural environmental conditions. The results indicate different thermal sensitivities in the physiological responses of N. africanum from tropical and temperate populations, especially during air breathing. The differences observed in the thermal physiology between the two populations suggest that the effect of global warming on this important mangrove species may be different under different climate regimes.
KeywordsSesarmidae Decapods Tropical and temperate wetlands Oxygen consumption Haemolymph Physiology Populations
The study was supported by SP3-People (Marie Curie) IRSES Project CREC (No. 247514). FG was funded by the Intra-European Fellowship (ex Marie Curie) Number 221017, FP7. This work is based upon research supported by the South African Research Chairs Initiative of the Department of Science and Technology and the National Research Foundation. MF and DD were supported also by DD baseline funding from King Abdullah University of Science and Technology (KAUST). We thank Jenny Marie Booth, Sara Cilio, Bruce Mostert, Laura Sbaragli and Irene Ortolani for fundamental help during Kenyan and South African laboratory and fieldwork.
Compliance with ethical standards
All applicable international, national and/or institutional guidelines for the care and use of animals were followed. Furthermore, all procedures performed in studies involving animals were in accordance with the ethical standards of the institution or practice at which the studies were conducted.
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