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Article Dans Une Revue PLoS ONE Année : 2023

The nocturnal life of the great scallops (Pecten maximus, L.): First description of their natural daily valve opening cycle

Résumé

Valvometry techniques used to monitor bivalve gaping activity have elucidated numerous relationships with environmental fluctuations, along with biological rhythms ranging from sub- daily to seasonal. Thus, a precise understanding of the natural activity of bivalves (i.e., not exposed to stressful environmental variations) is necessary as a baseline for detecting abnormal behaviors (deviations). This knowledge is also needed to reliably interpret observa- tions of bivalve gaping behavior and associated biological processes (e.g., respiration, nutri- tion) acquired over time-limited periods. With this in mind, we investigated the natural daily gaping activity of the great scallop (Pecten maximus) by continuously monitoring 35 individu- als in several individual tanks and in situ (Bay of Saint-Brieuc, Brittany, France) using fully autonomous Hall effect sensors. Our results revealed a circadian cycle (τ = 24.0h) in scallop gaping activity. Despite significant inter-individual variability in mean opening and cycle amplitude, almost all individuals (87.5%) exhibited nocturnal activity, with valves more open at night than during the day. A shift in light regime in the tanks triggered an instantaneous change in opening pattern, indicating that light levels strongly determine scallop activity. Based on the opening status of scallops, we also identified several gaping behaviors deviat- ing from the regular daily pattern (lack of rhythmicity, high daytime opening), potentially reflecting physiological weakness. While further long-term studies are required to fully under- stand the natural activity of scallops, these findings pave the way for studies focused on the scallop response to external factors and introduce further research into the detection of abnormal behaviors. Coupling observations of diel valve gaping cycles with other daily varia- tions in organismal and environmental parameters could help explain mechanisms driving the growth patterns of scallops observed in their shell striations. From a technical perspec- tive, our field-based monitoring demonstrates the suitability of autonomous valvometry sen- sors for studying mobile subtidal bivalve activity in remote offshore environments.
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hal-03979596 , version 1 (08-02-2023)

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Elie Retailleau, Arthur Chauvaud, Gaetan Richard, Delphine Mathias, Laurent Chauvaud, et al.. The nocturnal life of the great scallops (Pecten maximus, L.): First description of their natural daily valve opening cycle. PLoS ONE, 2023, 18 (1), pp.e0279690. ⟨10.1371/journal.pone.0279690⟩. ⟨hal-03979596⟩
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