Latitudinal influence on gametogenesis and host–parasite ecology in a marine bivalve model

Type Article
Date 2021-06
Language English
Author(s) Mahony Kate E.ORCID1, 2, 3, Lynch Sharon A.1, 2, 3, Egerton Sian1, 2, 3, Laffan Rebecca E.1, 2, 3, Correia Simão4, de Montaudouin Xavier5, Mesmer‐dudons Nathalie5, Freitas Rosa4, Culloty Sarah C.1, 2, 3
Affiliation(s) 1 : School of Biological, Earth and Environmental Sciences University College Cork Cork, Ireland
2 : Aquaculture and Fisheries Development Centre Environmental Research Institute University College Cork Cork ,Ireland
3 : MaREI Centre for Climate, Energy and Marine Environmental Research Institute University College Cork Cork, Ireland
4 : Departamento de Biologia and CESAM Universidade de Aveiro Aveiro ,Portugal
5 : UMR 5805 EPOC CNRSUniversité de Bordeaux Arcachon, France
Source Ecology and Evolution (2045-7758) (Wiley), 2021-06 , Vol. 11 , N. 11 , P. 7029-7041
DOI 10.1002/ece3.7551
Keyword(s) boom and bust, cockles, fisheries, latitude, parasite–host interactions, reproduction, shellfish, spatial variation, trematodes
Abstract

Reproduction and parasites have significant impacts on marine animal populations globally. This study aimed to investigate the associative effects of host reproduction and a host–parasite interplay on a marine bivalve, along a geographic gradient of latitude. Cockles Cerastoderma edule were sampled from five European sites (54°N to 40°N), between April 2018 and October 2019. A histological survey provided data on trematode (metacercaria and sporocyst life stages), prevalence, and cockle stage of gametogenesis to assess the influence of a latitudinal gradient on both interplays. Sex ratios at the northernmost sites were skewed toward females, and spawning size was reduced at the lower latitudes. Trematode infection did not follow a latitudinal gradient. Localized site‐related drivers, namely seawater temperature, varied spatially, having an impact on cockle–trematode interactions. Spawning was related to elevated temperatures at all sites. Prolonged spawning occurred at southern latitudes, where seawater temperatures were warmer. Trematode prevalence and the impact of trematodes on gametogenesis were found to be spatially variable, but not latitudinally. Therefore, it is not possible to determine the likelihood of boom and bust events in cockles, based on the latitudinal location of a population. In terms of sublethal impacts, it appeared that energy was allocated to reproduction rather than somatic growth in southern populations, with less energy allocated to reproduction in the larger, northern cockles. The demonstrated spatial trend of energy allocation indicates the potential of a temporal trend of reduced cockle growth at northern sites, as a result of warming sea temperatures. This awareness of the spatially varying drivers of populations is crucial considering the potential for these drivers/inhibitors to be exacerbated in a changing marine environment.

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How to cite 

Mahony Kate E., Lynch Sharon A., Egerton Sian, Laffan Rebecca E., Correia Simão, de Montaudouin Xavier, Mesmer‐dudons Nathalie, Freitas Rosa, Culloty Sarah C. (2021). Latitudinal influence on gametogenesis and host–parasite ecology in a marine bivalve model. Ecology and Evolution, 11(11), 7029-7041. Publisher's official version : https://doi.org/10.1002/ece3.7551 , Open Access version : https://archimer.ifremer.fr/doc/00691/80352/