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Jolivet A, Chauvaud L, Thébault J, et al. Circadian behaviour of Tectus (Trochus) niloticus in the southwest Pacific inferred from accelerometry. Mov Ecol. 2015;3(1):26doi: 10.1186/s40462-015-0054-5.
Jolivet, A., Chauvaud, L., Thébault, J., Robson, A. A., Dumas, P., Amos, G., & Lorrain, A. (2015). Circadian behaviour of Tectus (Trochus) niloticus in the southwest Pacific inferred from accelerometry. Movement ecology, 3(1), 26. https://doi.org/10.1186/s40462-015-0054-5
Jolivet, Aurélie, et al. "Circadian behaviour of Tectus (Trochus) niloticus in the southwest Pacific inferred from accelerometry." Movement ecology vol. 3,1 (2015): 26. doi: https://doi.org/10.1186/s40462-015-0054-5
Jolivet A, Chauvaud L, Thébault J, Robson AA, Dumas P, Amos G, Lorrain A. Circadian behaviour of Tectus (Trochus) niloticus in the southwest Pacific inferred from accelerometry. Mov Ecol. 2015 Sep 16;3(1):26. doi: 10.1186/s40462-015-0054-5. eCollection 2015. PMID: 26380713; PMCID: PMC4572623.
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Mov Ecol. 2015 Sep 16;3(1):26. doi: 10.1186/s40462-015-0054-5. eCollection 2015.

Circadian behaviour of Tectus (Trochus) niloticus in the southwest Pacific inferred from accelerometry.

Movement ecology

Aurélie Jolivet, Laurent Chauvaud, Julien Thébault, Anthony A Robson, Pascal Dumas, George Amos, Anne Lorrain

Affiliations

  1. Institut Universitaire Européen de la Mer (UMR CNRS 6539), Université de Bretagne Occidentale, rue Dumont d'Urville, F-29280 Plouzané, France.
  2. LabexMER, UMS 3113 CNRS, Institut Universitaire Européen de la Mer, Université de Brest, Rue Dumont D'Urville, 29280 Plouzané, France ; Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa, Chiba 277-8564 Japan.
  3. Institut de Recherche pour le Développement (UR 227 CoReUs), 2, Fisheries Department of Vanuatu, Port-Vila, Vanuatu.
  4. SANMA Fisheries Department of Vanuatu, Port-Vila, Vanuatu.
  5. Institut de Recherche pour le Développement (UMR 6539 CNRS/UBO/IRD/IFREMER), BPA5, 98848 Nouméa cedex, Nouvelle Calédonie.

PMID: 26380713 PMCID: PMC4572623 DOI: 10.1186/s40462-015-0054-5

Abstract

BACKGROUND: Behaviour and time spent active and inactive are key factors in animal ecology, with important consequences for bioenergetics. For the first time, here, we equipped the gastropod Tectus (= Trochus) niloticus with accelerometers to describe activity rhythms at two sites in the Southwest Pacific with different temperature regimes: New Caledonia and Vanuatu.

RESULTS: Based on a 24-hour cycle, T. niloticus activity began at dusk and gradually stopped during the night, before sunrise. This nocturnal behaviour was characterised by short (duration <30 s), low intensity (acceleration < 0.12 ɡ) movements and was probably associated with foraging behaviour. We assumed that activity ceased once the animal was satiated. Our analysis of two size groups in Vanuatu (80-90 mm vs. 120-140 mm, basal shell diameter) revealed a size effect; smaller specimens displayed greater activity, reflected by more intense and longer movements while migrating at night toward the edge of the reef. This nocturnal behaviour is not uncommon for grazing gastropods and is mainly associated with attempting to avoid visual predators whilst feeding.

CONCLUSIONS: The use of accelerometers coupled with light and temperature sensors provided detailed information on topshell behaviour and physiology under natural conditions. These data provide a foundation for identifying potential changes in the fine-scale behaviour of T. niloticus in response to environmental changes, which is essential in animal ecology and stock conservation.

Keywords: 24-hour periodicity; Accelerometry; Activity; Foraging; Migration; Tectus niloticus

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