Effect of Chemical Pollution and Parasitism on Heat Tolerance in Dung Beetles (Coleoptera: Scarabaeinae)
| Autor: | Daniel González-Tokman, Mariana Servín-Pastor, Carlos García-Robledo, Fredy Alvarado, Imelda Martínez-M, Fernanda Baena-Díaz, Federico Escobar, Yorleny Gil-Pérez |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Thermotolerance
0106 biological sciences Fauna Parasitism 010603 evolutionary biology 01 natural sciences Ecosystem services Feces 03 medical and health sciences Animals Critical thermal maximum Scarabaeinae Ecosystem 030304 developmental biology Scarabaeidae 0303 health sciences Ivermectin Ecology biology General Medicine biology.organism_classification Coleoptera Insect Science Ectotherm Threatened species Cattle |
| Zdroj: | Journal of Economic Entomology. 114:462-467 |
| ISSN: | 1938-291X 0022-0493 |
| DOI: | 10.1093/jee/toaa216 |
| Popis: | Ecosystem services provided by insects are threatened by recent increasing global temperatures, particularly in the tropics, where insects live close to their thermal limits. Given that tolerance to high temperatures depends on individual metabolism and physiological stress response, it may also be sensitive to other stressors that are common in natural and human-modified environments, such as pollution and parasite pressure. The effects of multiple stressors could be synergistic and can be particularly relevant in insects that provide highly valuable ecosystem services, such as dung beetles in cattle pastures. Here we measured heat tolerance (critical thermal maximum, CTmax) in dung beetles exposed to ivermectin, a toxic parasiticide excreted in cattle dung, with known negative effects on coprophagous fauna, and in beetles exposed to an immune challenge. We also exposed a group of beetles to a combination of both ivermectin and immune challenge to test for potential synergistic effects of both stressors. Contrary to our predictions, CTmax did not change with ivermectin exposure, but increased in immune-challenged beetles. As found in other insects, CTmax was higher in larger beetles, highlighting the importance of body size on thermal tolerance in ectotherms. We discuss potential mechanisms responsible of increased heat tolerance in immune-challenged beetles and highlight the importance of natural and human-induced environmental pressures that now interact with global warming and threaten ecosystem services provided by wild animals. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|