No maternal or direct effects of ocean acidification on egg hatching in the Arctic copepod Calanus glacialis

Thor, Peter, Vermandele, Fanny, Carignan, Marie-Hélène, Jacque, Sarah et Calosi, Piero ORCID: https://orcid.org/0000-0003-3378-2603 (2018). No maternal or direct effects of ocean acidification on egg hatching in the Arctic copepod Calanus glacialis. PLoS ONE, 13 (2). e0192496.

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Résumé

Widespread ocean acidification (OA) is transforming the chemistry of the global ocean and the Arctic is recognised as the region where this transformation will occur at the fastest rate. Moreover, many Arctic species are considered less capable of tolerating OA due to their lower capacity for acid-base regulation. This inability may put severe restraints on many fundamental functions, such as growth and reproductive investments, which ultimately may result in reduced fitness. However, maternal effects may alleviate severe effects on the offspring rendering them more tolerant to OA. In a highly replicated experiment we studied maternal and direct effects of OA predicted for the Arctic shelf seas on egg hatching time and success in the keystone copepod species Calanus glacialis. We incubated females at present day conditions (pHT 8.0) and year 2100 extreme conditions (pHT 7.5) during oogenesis and subsequently reciprocally transplanted laid eggs between these two conditions. Statistical tests showed no effects of maternal or direct exposure to OA at this level. We hypothesise that C. glacialis may be physiologically adapted to egg production at low pH since oogenesis can also take place at conditions of potentially low haemolymph pH of the mother during hibernation in the deep.

Type de document :	Article
Validation par les pairs :	Oui
Information complémentaire :	CC BY 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 :	03 avr. 2023 19:54
Dernière modification :	04 oct. 2023 18:28
URI :	https://semaphore.uqar.ca/id/eprint/2156

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