High thermal stress responses of Echinolittorina snails at their range edge predict population vulnerability to future warming
| Autor: | Yunwei Dong, Monthon Ganmanee, Stephen Robert Cartwright, Gray A. Williams, Tommy T. Y. Hui, Neil Hutchinson, Benny K. K. Chan, Guodong Han, Kee Alfian Abdul Adzis, Jie Wang |
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| Rok vydání: | 2019 |
| Předmět: |
Hot Temperature
Environmental Engineering 010504 meteorology & atmospheric sciences Range (biology) Biogeography Radiata Snails Population 010501 environmental sciences Edge (geometry) Global Warming 01 natural sciences Echinolittorina Animals Environmental Chemistry HSP70 Heat-Shock Proteins education Waste Management and Disposal 0105 earth and related environmental sciences education.field_of_study biology Ecology Global warming Temperature Global change biology.organism_classification Pollution Heat-Shock Response Environmental Monitoring |
| Zdroj: | Science of The Total Environment. 647:763-771 |
| ISSN: | 0048-9697 |
| Popis: | Populations at the edge of their species' distribution ranges are typically living at the physiological extreme of the environmental conditions they can tolerate. As a species' response to global change is likely to be largely determined by its physiological performance, subsequent changes in environmental conditions can profoundly influence populations at range edges, resulting in range extensions or retractions. To understand the differential physiological performance among populations at their distribution range edge and center, we measured levels of mRNA for heat shock protein 70 (hsp70) as an indicator of temperature sensitivity in two high-shore littorinid snails, Echinolittorina malaccana and E. radiata, between 1°N to 36°N along the NW Pacific coast. These Echinolittorina snails are extremely heat-tolerant and frequently experience environmental temperatures in excess of 55 °C when emersed. It was assumed that animals exhibiting high temperature sensitivity will synthesize higher levels of mRNA, which will thus lead to higher energetic costs for thermal defense. Populations showed significant geographic variation in temperature sensitivity along their range. Snails at the northern range edge of E. malaccana and southern range edge of E. radiata exhibited higher levels of hsp70 expression than individuals collected from populations at the center of their respective ranges. The high levels of hsp70 mRNA in populations at the edge of a species' distribution range may serve as an adaptive response to locally stressful thermal environments, suggesting populations at the edge of their distribution range are potentially more sensitive to future global warming. |
| Databáze: | OpenAIRE |
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