DOI: 10.1016/j.jtherbio.2020.102528
论文题名: Effects of constant and fluctuating incubation temperatures on hatching success and hatchling traits in the diamondback terrapin (Malaclemys terrapin) in the context of the warming climate
作者: Rowe C.L. ; Liang D. ; Woodland R.J.
刊名: Journal of Thermal Biology
ISSN: 3064565
出版年: 2020
卷: 88 语种: 英语
英文关键词: Climate change
; Global warming
; Hatching success
; Incubation
; Lethal temperature
; Thermal tolerance
Scopus关键词: animal experiment
; anthropometric parameters
; Article
; biological trait
; carapace length
; carapace width
; climate warming
; constant incubation temperature
; controlled study
; embryo
; embryo development
; embryo mortality
; fluctuating incubation temperature
; habitat
; habitat loss
; hatching
; hatchling
; hatchling size
; hatchling weight
; incubation temperature
; incubation time
; LT50
; Malaclemys terrapin
; nesting
; nonhuman
; survival rate
; terrapin
; thermal exposure
; yolk height
英文摘要: As global temperatures continue to rise, so too will the nest temperatures of many species of turtles. Yet for most turtle species, including the estuarine diamondback terrapin (Malaclemys terrapin), there is limited information on embryonic sensitivity to elevated temperature. We incubated eggs of M. terrapin at three, mean temperatures (31, 34, 37 °C) under two thermal exposure regimes (constant or semi-naturally fluctuating temperature) and measured hatching success, developmental rate, and hatchling size. Hatching success was 100% at 31 °C and 67% at 34 °C, respectively; at 37 °C, all eggs failed early in the incubation period. These values were unaffected by exposure regime. The modeled LT50 (temperature that was lethal to 50% of the test population) was 34.0 °C in the constant and 34.2 °C in the fluctuating thermal regime, reflecting a steep decline in survival between 33 and 35 °C. Hatchlings having been incubated at a constant 34 °C hatched sooner than those incubated at 31 °C under either constant or fluctuating temperature. Hatchlings were smaller in straight carapace length (CL) and width after having been incubated at 34 °C compared to 31 °C. Larger (CL) hatchlings resulted from fluctuating temperature conditions relative to constant temperature conditions, regardless of mean temperature. Based upon recent temperatures in natural nests, the M. terrapin population studied here appears to possess resiliency to several degrees of elevated mean nest temperatures, beyond which, embryonic mortality will likely sharply increase. When considered within the mosaic of challenges that Maryland's M. terrapin face as the climate warms, including ongoing habitat losses due to sea level rise and impending thermal impacts on bioenergetics and offspring sex ratios, a future increase in embryonic mortality could be a critical factor for a population already experiencing ecological and physiological challenges due to climate change. © 2020 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159645
Appears in Collections: 气候变化与战略
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作者单位: University of Maryland Center for Environmental Science, Chesapeake Biological Laboratory, 146 Williams Street, P.O. Box 38, Solomons, MD 20688, United States
Recommended Citation:
Rowe C.L.,Liang D.,Woodland R.J.. Effects of constant and fluctuating incubation temperatures on hatching success and hatchling traits in the diamondback terrapin (Malaclemys terrapin) in the context of the warming climate[J]. Journal of Thermal Biology,2020-01-01,88