Lethal temperatures in two populations of lion's paw scallop (Nodipecten subnodosus) off the Baja California peninsula, Mexico

Understanding population-level variation in thermal tolerance is essential for predicting species responses to climate change. This study assessed the lethal low and high temperatures (LT50) of juvenile Pacific lion-paw scallops (Nodipecten subnodosus) from two environmentally contrasting regions of the Baja California Peninsula: Laguna Ojo de Liebre (LOL, Pacific coast) and Bahía de Los Ángeles (BLA, Gulf of California). Individuals were exposed to a 96-h thermal bioassay across seven fixed temperatures (5–35°C) utilizing a precision-controlled marine simulation system. Mortality was recorded hourly, and LT50 values were estimated via Probit regression analysis. Both populations exhibited similar lower LT50 (~6.6°C), but significantly different upper LT50: 30.58°C for LOL and 32.13°C for BLA. Results are evidence of adaptive evolution differences. Comparison with historical environmental data indicate that BLA scallops, despite facing higher thermal stress, exhibit greater resilience, making them promising candidates for aquaculture under climate change scenarios. Future research may consider the LT50 values reported here as instrumental for projecting the climate change impacts and aquaculture planning.

• Publication year

  2026

• Venue

  CICIMAR oceánides

• Publication date

  2026-01-13

• Fields of study

  Not labeled

• Identifiers
  DOI 10.37543/oceanides.v40i1-2.324
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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