Author:
Teixeira Alves Mickael,Taylor Nick G. H.,Tidbury Hannah J.
Abstract
AbstractPersistence of wild Pacific oyster, Magallana gigas, also known as Crassostrea gigas, has been increasingly reported across Northern European waters in recent years. While reproduction is inhibited by cold waters, recent warm summer temperature has increased the frequency of spawning events. Although correlation between the increasing abundance of Pacific oyster reefs in Northern European waters and climate change is documented, persistence of wild populations may also be influenced by external recruitment from farmed populations and other wild oyster populations, as well as on competition for resources with aquaculture sites. Our understanding of the combined impact of the spawning frequency, external recruitment, and competition on wild population persistence is limited. This study applied an age-structured model, based on ordinary differential equations, to describe an oyster population under discrete temperature-related dynamics. The impact of more frequent spawning events, external recruitment, and changes in carrying capacity on Pacific oyster density were simulated and compared under theoretical scenarios and two case studies in Southern England. Results indicate that long term persistence of wild oyster populations towards carrying capacity requires a high frequency of spawning events but that in the absence of spawning, external recruitment from farmed populations and other wild oyster populations may act to prevent extinction and increase population density. However, external recruitment sources may be in competition with the wild population so that external recruitment is associated with a reduction in wild population density. The implications of model results are discussed in the context of wild oyster population management.
Funder
Department for Environment, Food and Rural Affairs, UK Government
Publisher
Springer Science and Business Media LLC
Reference69 articles.
1. Bayne, B. et al. The proposed dropping of the genus Crassostrea for all Pacific cupped oysters and its replacement by a new genus Magallana: a dissenting view. J. Shellfish Res. 36, 545–547 (2017).
2. Mann, R. Some biochemical and physiological aspects of growth and gametogenesis in Crassostrea gigas and Ostrea edulis grown at sustained elevated temperatures. J. Mar. Biol. Assoc. UK 59, 95–110 (1979).
3. Humphreys, J., Herbert, R. J., Roberts, C. & Fletcher, S. A reappraisal of the history and economics of the Pacific oyster in Britain. Aquaculture 428, 117–124 (2014).
4. Ellis, T., Gardiner, R., Gubbins, M., Reese, A. & Smith, D. Aquaculture statistics for the UK, with a focus on England and Wales 2012. Centre for Environment Fisheries & Aquaculture Science (Cefas) Weymouth (2015).
5. Herbert, R. J. et al. Ecological impacts of non-native Pacific oysters (Crassostrea gigas) and management measures for protected areas in Europe. Biodivers. Conserv. 25, 2835–2865 (2016).
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