Author : Carlos Caetano Beçak de Paula Leao
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (135 download)
Book Synopsis Effects of Incubation Temperature on Thermal Performance of Burst Swimming Speed and Resting Oxygen Consumption of Baja California Chorus Frog Tadpoles, Pseudacris Hypochondriaca by : Carlos Caetano Beçak de Paula Leao
Download or read book Effects of Incubation Temperature on Thermal Performance of Burst Swimming Speed and Resting Oxygen Consumption of Baja California Chorus Frog Tadpoles, Pseudacris Hypochondriaca written by Carlos Caetano Beçak de Paula Leao and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Developmental phenotypic plasticity is the ability of organisms to produce changes in their phenotype in response to embryonic, fetal, or early life environmental conditions. Environmental cues, both biotic and abiotic, can trigger alternate phenotypic expressions, with the thermal environment being a prime determinant. Environmental temperature is an ideal variable for investigating poikilothermic organismal developmental phenotypic plasticity; it dictates the kinetic pace of development, and it is the abiotic factor most consistently affected by anthropogenic climate change. Average climatic temperature and temperature fluctuations are projected to continue increasing this century. In this study, we investigated the effects of increased constant incubation temperature and fluctuating incubation temperature on two physiological traits, burst swimming speed and resting oxygen consumption, for the thermally robust amphibian, Baja California chorus frog (Pseudacris hypochondriaca). Amphibian embryos and larvae are aquatic, poikilothermic, and sensitive to environmental changes, and have long been used as research animals in studies on plasticity. We incubated P. hypochondriaca embryos and subsequently hatched larvae in four different incubation temperature groups (constant temperature group 15°C and fluctuating temperature groups 10 ⇆ 20°C, 12.5 ⇆ 17.5°C, and 15 ⇆ 25°C) then measured resting oxygen consumption of larvae from each incubation temperature group at different measurement temperatures 10°C, 15°C, 20°C and 25°C and burst swim speed for larvae from each treatment temperature at select measurement temperatures. We hypothesized that thermal performance would reflect embryonic temperature conditions, so that (1) larvae (tadpoles) incubated in warmer conditions would have lower resting oxygen consumption rates and faster swimming speeds at warmer measurement temperatures, (2) larvae incubated in cooler conditions would have higher resting oxygen consumption rates and faster swimming speeds at cooler measurement temperatures, and (3) larvae incubated in greater temperature fluctuations would maintain higher performance across a wider range of temperatures than those incubated in smaller temperature fluctuations. Overall, higher burst swimming speed may reflect an increase in performance, whereas an increase in resting oxygen consumption at lower temperatures or a decrease in resting oxygen consumption at higher temperatures may reflect "improved" performance. We found no significant difference in thermal performance in neither burst swim speed nor oxygen consumption at any measurement temperature resulting from incubation in different temperature conditions. There were differences in performance of oxygen consumption dependent on measurement temperature, but they were unaffected by incubation temperature. We also identified trends in the relationship between treatment temperature and developmental rates that conform partially to the warmer-faster rule of ectotherm development and trends in the relationship between treatment temperature and morphometrics that conform partially to the temperature-size rule of phenotypic plasticity.
