Up and down or how to stay in the bay: retentive strategies of Olympia oyster larvae in a shallow estuary
2015; Inter-Research; Volume: 530; Linguagem: Inglês
10.3354/meps11283
ISSN1616-1599
Autores Tópico(s)Marine and fisheries research
ResumoMEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 530:103-117 (2015) - DOI: https://doi.org/10.3354/meps11283 Up and down or how to stay in the bay: retentive strategies of Olympia oyster larvae in a shallow estuary Laura G. Peteiro1,2,*, Alan L. Shanks2 1Facultade de Ciencias, Departamento de Ecoloxía y Bioloxía Animal, Universidade de Vigo, Vigo 36310, Spain 2Oregon Institute of Marine Biology, University of Oregon, PO Box 5389, Charleston, OR 97420, USA *Corresponding author: lauragpeteiro@gmail.com ABSTRACT: The decline of Olympia oysters along the US west coast has prompted interest in population recovery and therefore the larval biology of the species. Olympia oysters are estuarine dependent as adults. Larvae must be retained in or return to the estuary for successful recruitment. We examined larval abundance and tidally timed vertical migration for Ostrea lurida in Coos Bay, Oregon. Weekly zooplankton tows and CTD casts were conducted from June to October 2010 in alternating rising and falling tides. All larval stages were represented, confirming that larvae are retained in the estuary during their entire development. Possible mechanisms to increase retention are the timing of larval release and the behaviour of the larvae. No Olympia larvae were observed until mid-July, when water temperature rose over 16°C. Above this temperature, the probability of presence increased directly with temperature and indirectly with stratification (generalized additive model; R2 = 0.89); larvae were most abundant during the dry season (August to September), when low river inflow leads to long water residence times in the upper bay, where the water is warm (>16°C), salty (>25) and weakly stratified. Even in well-mixed conditions, Olympia oyster larvae performed tidally timed vertical migrations, moving deeper during falling tides (mean depth 7.22 ± 0.43 and 3.79 ± 0.69 m for falling and rising tides, respectively). High current speeds (>0.5 m s-1) overcame their swimming capability, preventing vertical migration and limiting the retentive effectiveness of this behaviour. Matching larval release with predictable hydrographical features (dry season) that favour larval retention in the bay may be the main factor determining population sustainability in Coos Bay. KEY WORDS: Olympia oyster · Estuarine-dependent species · Tidal-timed migration · Phenology of reproduction · Larval dispersal · Meta-population connectivity · Self-recruitment Full text in pdf format PreviousNextCite this article as: Peteiro LG, Shanks AL (2015) Up and down or how to stay in the bay: retentive strategies of Olympia oyster larvae in a shallow estuary. Mar Ecol Prog Ser 530:103-117. https://doi.org/10.3354/meps11283 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 530. Online publication date: June 18, 2015 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2015 Inter-Research.
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