Scholarlink

<p>Larval thermal tolerance helps define climate change response in many marine species, but significant knowledge gaps exist. For example, American lobster (<i>Homarus americanus</i>) is economically and ecologically important, yet the thermal tolerances of its larval stages remain poorly defined. Lobster habitat in the Gulf of Maine is warming rapidly, creating a pressing need to understand how lobster larvae will respond. Here, we provide the first comprehensive assessment of upper and lower critical (T<sub>c</sub>) and pejus (T<sub>p</sub>) temperatures for all planktonic larval stages and the first benthic stage of the American lobster based on scope for activity (respirometry-based), survivorship and growth, using larvae from lobsters collected in the Gulf of Maine in 2020–2022. Ontogenetic changes in thermal tolerance corresponded to temperatures they would experience in the field. Newly hatched stage I larvae were more cold tolerant than subsequent stages reflecting overwintering on the bottom as embryos. Stage II, III and IV were more heat tolerant and less cold tolerant corresponding to previously reported shoaling of vertical distributions. The first benthic stage (V), which resides in cool bottom water, was more cold tolerant. Planktonic stage IV had the narrowest range of T<sub>c</sub> and T<sub>p</sub> making it potentially the most vulnerable developmental stage to climate change. Thermal limits established here improve understanding of physiological response to temperature stress, but additional research is needed to elucidate behavioral responses and thermal tolerance of larvae developing in situ. Our results illustrate the importance of defining stage specific temperature tolerance in species with multiple larval stages.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Ontogenetic shifts in thermal tolerance of planktonic larvae in the American lobster, Homarus americanus

  • 期刊论文

  • 发表日期：

    2026年1月5日

查看全文
  • Eric R. Annis,
  • Aubrey Jane,
  • Markus Frederich,
  • ReidAnn Sever,
  • Jesica Waller,
  • Heather Glon,
  • Doug B. Rasher

摘要

Larval thermal tolerance helps define climate change response in many marine species, but significant knowledge gaps exist. For example, American lobster (Homarus americanus) is economically and ecologically important, yet the thermal tolerances of its larval stages remain poorly defined. Lobster habitat in the Gulf of Maine is warming rapidly, creating a pressing need to understand how lobster larvae will respond. Here, we provide the first comprehensive assessment of upper and lower critical (Tc) and pejus (Tp) temperatures for all planktonic larval stages and the first benthic stage of the American lobster based on scope for activity (respirometry-based), survivorship and growth, using larvae from lobsters collected in the Gulf of Maine in 2020–2022. Ontogenetic changes in thermal tolerance corresponded to temperatures they would experience in the field. Newly hatched stage I larvae were more cold tolerant than subsequent stages reflecting overwintering on the bottom as embryos. Stage II, III and IV were more heat tolerant and less cold tolerant corresponding to previously reported shoaling of vertical distributions. The first benthic stage (V), which resides in cool bottom water, was more cold tolerant. Planktonic stage IV had the narrowest range of Tc and Tp making it potentially the most vulnerable developmental stage to climate change. Thermal limits established here improve understanding of physiological response to temperature stress, but additional research is needed to elucidate behavioral responses and thermal tolerance of larvae developing in situ. Our results illustrate the importance of defining stage specific temperature tolerance in species with multiple larval stages.