Thermal sensitivity of the crab Neosarmatium africanum in tropical and temperate mangroves on the east coast of Africa
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.
- Anderson, M. J., R. N. Gorley & K. R. Clarke, 2008. Permanova + for primer: guide to software and statistical methods, 1st edn. Primer-E, Plymouth, 214 p.Google Scholar
- Bates, D. M., 2010. Fitting linear mixed-effects models using lme4. http://lme4.r-forge.r-project.org/lMMwR/lrgprt.pdf.
- Bright, D. B. & C. L. Hogue, 1972. A synopsis of the burrowing land crabs of the world and list of their arthropod symbionts and burrow associates. Una sinopsis mundial de los cangrejos terrestres de madrigueras y lista de sus artrópodos simbiontes y madrigueras asociadas. Contributions in Science 20: 1–58.Google Scholar
- Deutsch, C. A., J. J. Tewksbury, R. B. Huey, K. S. Sheldon, C. K. Ghalambor, D. C. Haak & P. R. Martin, 2008. Impacts of climate warming on terrestrial ectotherms across latitude. Proceedings of the National Academy of Sciences of the United States of America 105: 6668–6672.CrossRefPubMedPubMedCentralGoogle Scholar
- Gaitán-Espitia, J. D., L. D. Bacigalupe, T. Opitz, N. A. Lagos, T. Timmermann & M. A. Lardies, 2014. Geographic variation in thermal physiological performance of the intertidal crab Petrolisthes violaceus along a latitudinal gradient. The Journal of experimental biology 217: 4379–4386.CrossRefPubMedGoogle Scholar
- Gaston, K. J., S. L. Chown, P. Calosi, J. Bernardo, D. T. Bilton, A. Clarke, S. Clusella-Trullas, C. K. Ghalambor, M. Konarzewski, L. S. Peck, W. P. Porter, H. O. Pörtner, E. L. Rezende, P. M. Schulte, J. I. Spicer, J. H. Stillman, J. S. Terblanche & M. van Kleunen, 2009. Macrophysiology: a conceptual reunification. The American Naturalist 174: 595–612.CrossRefPubMedGoogle Scholar
- Huey, R. B., M. R. Kearney, A. Krockenberger, J. A. M. Holtum, M. Jess & S. E. Williams, 2012. Predicting organismal vulnerability to climate warming: roles of behaviour, physiology and adaptation. Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences 367: 1665–1679.CrossRefPubMedPubMedCentralGoogle Scholar
- Poloczanska, E. S., C. J. Brown, W. J. Sydeman, W. Kiessling, D. S. Schoeman, P. J. Moore, K. Brander, J. F. Bruno, L. B. Buckley, M. T. Burrows, C. M. Duarte, B. S. Halpern, J. Holding, C. V. Kappel, M. I. O’Connor, J. M. Pandolfi, C. Parmesan, F. Schwing, S. A. Thompson & A. J. Richardson, 2013. Global imprint of climate change on marine life. Nature Climate Change 3: 919–925.CrossRefGoogle Scholar
- Ragionieri, L., S. Fratini & C. D. Schubart, 2012. Revision of the Neosarmatium meinerti species complex (Decapoda: Brachyura: Sesarmidae), with descriptions of three pseudocryptic Indo-West Pacific species. The Raffles Bulletin of Zoology 60: 71–87.Google Scholar
- Sinclair, B. J., K. E. Marshall, M. A. Sewell, D. L. Levesque, C. S. Willett, S. Slotsbo, Y. Dong, C. D. G. Harley, D. J. Marshall, B. S. Helmuth & R. B. Huey, 2016. Can we predict ectotherm responses to climate change using thermal performance curves and body temperatures? Ecology Letters 19: 1372–1385.CrossRefPubMedGoogle Scholar
- Stuart-Smith, R. D., G. J. Edgar, N. S. Barrett, S. J. Kininmonth & A. E. Bates, 2015. Thermal biases and vulnerability to warming in the world’ s marine fauna. Nature Nature Publishing Group 528: 1–17.Google Scholar
- Sunday, J. M., A. E. Bates, M. R. Kearney, R. K. Colwell, N. K. Dulvy, J. T. Longino & R. B. Huey, 2014. Thermal-safety margins and the necessity of thermoregulatory behavior across latitude and elevation. Proceedings of the National Academy of Sciences of the United States of America 111: 5610–5615.CrossRefPubMedPubMedCentralGoogle Scholar
- Terblanche, J. S., A. A. Hoffmann, K. A. Mitchell, L. Rako, P. C. Roux & S. L. Chown, 2011. Ecologically relevant measures of tolerance to potentially lethal temperatures. 10: 3713–3725.Google Scholar
- Tomlinson, P. B., 1986. The botany of mangroves. Cambridge Tropical Biology Series. 234: 373–374.Google Scholar
- Verberk, W. C. E. P., F. Bartolini, D. J. Marshall, H.-O. Pörtner, J. S. Terblanche, C. R. White & F. Giomi, 2015. Can respiratory physiology predict thermal niches? Annals of the New York Academy of Sciences 179: 1–16.Google Scholar
- Verberk, W. C. E. P., J. Overgaard, R. Ern, M. Bayley, T. Wang, L. Boardman & J. S. Terblanche, 2016. Does oxygen limit thermal tolerance in arthropods? A critical review of current evidence. Comparative Biochemistry and Physiology -Part A: Molecular and Integrative Physiology The Authors 192: 64–78.CrossRefGoogle Scholar