A trade-off between mucocytes and bacteriocytes in Loripes orbiculatus gills (Bivalvia, Lucinidae): a mixotrophic adaptation to seasonality and reproductive status in a symbiotic species?

Type Article
Date 2020-09
Language English
Author(s) Roques Cécile1, Grousset Evelyse1, Troussellier Marc1, Hermet Sophie1, Le Carrer Johan2, Sar Chamroeun3, Caro Audrey1
Affiliation(s) 1 : Marine Biodiversity, Exploitation and Conservation (MARBEC), Univ Montpellier, CNRS, Ifremer, IRD, Montpellier, France
2 : Martinique Natural Marine Park, Fort-de-France, France
3 : Montpellier Ressources Imagerie, Montpellier, France
Source Marine Biology (0025-3162) (Springer Science and Business Media LLC), 2020-09 , Vol. 167 , N. 10 , P. 154 (16p.)
DOI 10.1007/s00227-020-03768-w
WOS© Times Cited 1
Abstract

In this study, we investigated the composition of the gill tissue relative to the reproductive status of the lucinid clam Loripes orbiculatus (sensus Poli, 1791) according to seasonal as well as biological parameters to provide insights into the physiological variability of this symbiotic bivalve. Temporal variation in population density was also studied. The species was investigated in Zostera noltii seagrass beds in the Thau lagoon (43°26′52.27′′ N, 3°39′6.25′′ E) in the south of France in a monthly sampling study from May 2013 to July 2015. A total of 257 individual adults of different sizes were analysed according to water temperature and salinity variations. The findings revealed a very stable Loripes density over time, with one single reproductive period during late spring/early summer. We also found that bacteriocytes and mucocytes in the gills were negatively correlated and highly variable in their respective proportions. Bacteriocytes remained dominant during cold periods, whereas mucocytes appeared mainly in the gills of large individuals when the water temperature increased in the spring. As mucocytes were also related with gonadal maturation, we hypothesize that these may allow the host to increase the proportion of heterotrophy in its nutrition during spring primary production to face the metabolic demands required for reproduction. It is possible that mucocytes may also be involved in host immunity.

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Roques Cécile, Grousset Evelyse, Troussellier Marc, Hermet Sophie, Le Carrer Johan, Sar Chamroeun, Caro Audrey (2020). A trade-off between mucocytes and bacteriocytes in Loripes orbiculatus gills (Bivalvia, Lucinidae): a mixotrophic adaptation to seasonality and reproductive status in a symbiotic species? Marine Biology, 167(10), 154 (16p.). Publisher's official version : https://doi.org/10.1007/s00227-020-03768-w , Open Access version : https://archimer.ifremer.fr/doc/00653/76550/