Temperature-induced metabolic performance in early life stages of two brachyuran crabs

IF 2.9 2区 生物学 Q2 BIOLOGY
Kerry-Ann van der Walt , Seshnee Reddy , Antony M. Knights , Louise B. Firth , Francesca Porri
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Abstract

Understanding marine species' metabolic responses to short- and long-term temperature variation is critical for predicting the resilience of communities and ecosystems at local and global scales. This study investigated the effect of temperature on the routine metabolic rate (RMR) across the zoea and megalopa stages of two brachyuran species, Hymenosoma orbiculare and Pinnotheres sp. Respirometry results under temperatures ranging from 11 to 25 °C revealed stage- and species-specific metabolic responses. In H. orbiculare, RMR in the megalopa life stage increased steeply and significantly at 22 °C, whereas the zoea life stage showed no significant change across the temperature range tested. For Pinnotheres sp., the megalopa life stage also exhibited significant RMR increases above 19 °C, while the zoea life stage showed stable RMR. These results demonstrate that megalopae, particularly H. orbiculare, are more metabolically sensitive to acute warming, operating closer to their physiological limits, while zoeae maintain relative stability, but may be constrained by limited plasticity under sustained warming. Species-level comparisons indicate that H. orbiculare, with its higher and more variable RMR, is more vulnerable than Pinnotheres sp., whose larval stages maintain comparatively stable metabolism. This study highlights the importance of understanding life-stage- and species-specific thermal responses to better predict larval survival, recruitment, and resilience under future climate warming.
两种短爪蟹生命早期温度诱导的代谢表现
了解海洋物种对短期和长期温度变化的代谢反应对于预测当地和全球范围内群落和生态系统的恢复能力至关重要。本文研究了温度对圆膜虫(Hymenosoma orbiculare)和平诺虫(pinnothers sp.)两种短尾纲动物小虫和大虫阶段常规代谢率(RMR)的影响。在11 ~ 25℃的温度范围内,呼吸测量结果揭示了不同阶段和物种的代谢反应。在22℃的温度范围内,圆圆圆蝽生活期的RMR急剧显著增加,而小虫生活期的RMR在整个温度范围内变化不显著。在19°C以上,大鳞虫生活期的RMR也显著增加,而小鳞虫生活期的RMR则保持稳定。这些结果表明,大翅目,特别是圆翅目,对急性变暖的代谢更敏感,更接近其生理极限,而zoeae保持相对稳定,但可能受到持续变暖的有限可塑性的限制。在种水平上的比较表明,相对于幼虫期代谢相对稳定的平叶螟而言,圆叶螟的RMR较高且变化较大,因此其易受伤害。这项研究强调了了解生命阶段和物种特异性热反应的重要性,以更好地预测未来气候变暖下幼虫的生存、招募和恢复能力。
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来源期刊
Journal of thermal biology
Journal of thermal biology 生物-动物学
CiteScore
5.30
自引率
7.40%
发文量
196
审稿时长
14.5 weeks
期刊介绍: The Journal of Thermal Biology publishes articles that advance our knowledge on the ways and mechanisms through which temperature affects man and animals. This includes studies of their responses to these effects and on the ecological consequences. Directly relevant to this theme are: • The mechanisms of thermal limitation, heat and cold injury, and the resistance of organisms to extremes of temperature • The mechanisms involved in acclimation, acclimatization and evolutionary adaptation to temperature • Mechanisms underlying the patterns of hibernation, torpor, dormancy, aestivation and diapause • Effects of temperature on reproduction and development, growth, ageing and life-span • Studies on modelling heat transfer between organisms and their environment • The contributions of temperature to effects of climate change on animal species and man • Studies of conservation biology and physiology related to temperature • Behavioural and physiological regulation of body temperature including its pathophysiology and fever • Medical applications of hypo- and hyperthermia Article types: • Original articles • Review articles
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