Stage-Specific Changes in Physiological and Life-History Responses to Elevated Temperature and Pco2 during the Larval Development of the European Lobster Homarus gammarus (L.)

Small, Daniel P., Calosi, Piero ORCID: https://orcid.org/0000-0003-3378-2603, Boothroyd, Dominic, Widdicombe, Stephen et Spicer, John I. (2015). Stage-Specific Changes in Physiological and Life-History Responses to Elevated Temperature and Pco2 during the Larval Development of the European Lobster Homarus gammarus (L.). Physiological and Biochemical Zoology, 88 (5). pp. 494-507.

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Résumé

An organism’s physiological processes form the link between its life-history traits and the prevailing environmental conditions, especially in species with complex life cycles. Understanding how these processes respond to changing environmental conditions, thereby affecting organismal development, is critical if we are to predict the biological implications of current and future global climate change. However, much of our knowledge is derived from adults or single developmental stages. Consequently, we investigated the metabolic rate, organic content, carapace mineralization, growth, and survival across each larval stage of the European lobster Homarus gammarus, reared under current and predicted future ocean warming and acidification scenarios. Larvae exhibited stage-specific changes in the temperature sensitivity of their metabolic rate. Elevated Pco2 increased C∶N ratios and interacted with elevated temperature to affect carapace mineralization. These changes were linked to concomitant changes in survivorship and growth, from which it was concluded that bottlenecks were evident during H. gammarus larval development in stages I and IV, the transition phases between the embryonic and pelagic larval stages and between the larval and megalopa stages, respectively. We therefore suggest that natural changes in optimum temperature during ontogeny will be key to larvae survival in a future warmer ocean. The interactions of these natural changes with elevated temperature and Pco2 significantly alter physiological condition and body size of the last larval stage before the transition from a planktonic to a benthic life style. Thus, living and growing in warm, hypercapnic waters could compromise larval lobster growth, development, and recruitment. -- Keywords : Homarus gammarus ; ocean warming ; ocean acidification ; life history ; larval development ; seafood.

Type de document :	Article
Validation par les pairs :	Oui
Information complémentaire :	CC BY-NC 4.0
Version du document déposé :	Version officielle de l'éditeur
Départements et unités départementales :	Département de biologie, chimie et géographie
Déposé par :	DIUQAR UQAR
Date de dépôt :	05 avr. 2023 15:41
Dernière modification :	02 oct. 2023 14:35
URI :	https://semaphore.uqar.ca/id/eprint/2169

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