2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/21/2019 | 9:00 AM - 9:15 AM | GROWTH AND SURVIVAL JOINTLY PREDICT THE UPPER THERMAL LIMITS OF THE STONEFLY PTERONARCYS CALIFORNICA | 250 DE
GROWTH AND SURVIVAL JOINTLY PREDICT THE UPPER THERMAL LIMITS OF THE STONEFLY PTERONARCYS CALIFORNICA
Species distribution models (SDMs) imply that temperature is a dominant factor influencing the distribution of freshwater macroinvertebrates. However, a strong SDM-derived relationship between temperature and probability of occurrence does not guarantee a causal association. If temperature predictors used in SDMs have a causal basis, we should be able to experimentally validate SDMs by assessing how fitness measures vary with temperature. We hypothesized that growth and survival would jointly predict upper temperature limits (UTLs) derived from SDMs. To test this hypothesis, we reared nymphs of Pteronarcys californica under 7 temperatures (13-24°C) and measured growth and survivorship in each treatment over 70 days. The product of growth and survivorship (fitness) in the lab experiments dropped to zero at 24°C. This value is higher than the UTL of 21°C estimated from two field datasets. However, the difference between the lab- and field-inferred UTLs is consistent with the generalization that realized niches (field) are more narrow than fundamental niches (lab). We conclude that temperature likely influences the distribution of P.californica through its effect on individual fitness. We are currently conducting similar experiments on several other species to more comprehensively test our hypothesis.
- Invertebrate
- Life History
- Distribution
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Presenters/Authors
Donald Benkendorf
(), Utah State University, donald.benkendorf@aggiemail.usu.edu;
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Charles Hawkins
(), Utah State University, chuck.hawkins@usu.edu;
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