RRC ID 68362
Author Blanckenhorn WU, Berger D, Rohner PT, Schäfer MA, Akashi H, Walters RJ.
Title Comprehensive thermal performance curves for yellow dung fly life history traits and the temperature-size-rule.
Journal J Therm Biol
Abstract Ambient temperature strongly determines the behaviour, physiology, and life history of all organisms. The technical assessment of organismal thermal niches in form of now so-called thermal performance curves (TPC) thus has a long tradition in biological research. Nevertheless, several traits do not display the idealized, intuitive dome-shaped TPC, and in practice assessments often do not cover the entire realistic or natural temperature range of an organism. We here illustrate this by presenting comprehensive sex-specific TPCs for the major (juvenile) life history traits of yellow dung flies (Scathophaga stercoraria; Diptera: Scathophagidae). This concerns estimation of prominent biogeographic rules, such as the temperature-size-rule (TSR), the common phenomenon in ectothermic organisms that body size decreases as temperature increases. S. stercoraria shows an untypical asymptotic TPC of continuous body size increase with decreasing temperature without a peak (optimum), thus following the TSR throughout their entire thermal range (unlike several other insects presented here). Egg-to-adult mortality (our best fitness estimator) also shows no intermediate maximum. Both may relate to this fly entering pupal winter diapause below 12 °C. While development time presents a negative exponential relationship with temperature, development rate and growth rate typify the classic TPC form for this fly. The hitherto largely unexplored close relative S. suilla with an even more arctic distribution showed very similar responses, demonstrating large overlap among two ecologically similar, coexisting dung fly species, thus implying limited utility of even complete TPCs for predicting species distribution and coexistence.
Volume 100
Pages 103069
Published 2021-8-5
DOI 10.1016/j.jtherbio.2021.103069
PII S0306-4565(21)00237-0
PMID 34503806
GBIF Insect specimen database of Kanagawa Prefectural Museum of Natural History Insect specimens in the Museum of Nature and Human Activities, Hyogo Prefecture, Japan Insect specimens of Toyama Science Museum Insect specimens of Iwate Prefectural Museum Insect Collection of Natural History Museum and Institute, Chiba Entomological Specimens of Museum of Nature and Human Activities, Hyogo Pref., Japan Insect Specimen Database of Fukui City Museum of Natural History