Assessment and comparison of the Marennes-Oléron Bay (France) and Carlingford Lough (Ireland) carrying capacity with ecosystem models

被引：6

作者：

Bacher C. ^{[1
]}

Duarte P. ^{[2
]}

Ferreira J.G. ^{[3
]}

Héral M. ^{[1
]}

Raillard O. ^{[4
]}

机构：

[1] CREMA, 17137 L'Houmeau, Place du Séminaire

[2] Universidade Fernando Pessoa, Dep. de Ciências e Tecnologia, 4200 Porto, Praça 9 de Abril

[3] Universidade Nova de Lisboa, Fac. Ciencias e Tecnologia, DCEA, 2825 Monte de Caparica, Quinta da Torre

[4] CETYS, 13791 Aix-en-Provence, Cedex 3

来源：

Aquatic Ecology | 1997年 / 31卷 / 4期

关键词：

Aquaculture; Box model; Crassostrea gigas; Population dynamics; Production;

D O I：

10.1023/A:1009925228308

中图分类号：

学科分类号：

摘要：

Based on the individual growth, food limitation, population renewal through seeding, and individual marketable size, a theoretical model of the cultured species population dynamics was used to assess the carrying capacity of an ecosystem. It gave a dome-shape curve relating the annual production and the standing stock under the assumption of individual growth limited by the available food in an ecosystem. It also showed the influence of mortality rate and marketable size on this curve and was introduced as a means to explore the global properties resulting from the interactions between the ecophysiology of the reared species and the environment at the ecosystem level. In a second step, an ecosystem model was built to assess the carrying capacity of Marennes-Oléron bay, the most important shellfish culture site in France, with a standing stock of Crassostrea gigas around 100 000 tonnes fresh weight (FW) and an annual production of 30 000 tonnes FW. The ecosystem model focused on the oyster growth rate and considered the interaction between food availability, residence time of the water, oyster ecophysiology and number of individuals. It included a spatial discretization of the bay (box design) based on a hydrodynamic model, and the nitrogen or carbon cycling between phytoplankton, cultured oysters, and detritus. From simulations of the oyster growth with different seeding values, a curve relating the total annual production and the standing stock was obtained. This curve exhibited a dome shape with a maximum production corresponding to an optimum standing stock. The model predicted a maximum annual production of 45 000 tonnes FW for a standing stock around 115 000 tonnes FW. The prediction confirmed some results obtained empirically in the case of Marennes-Oléron bay and the results of the theoretical model. Results were compared with those obtained in Carlingford Lough (Ireland) using a similar ecosystem model. Carlingford Lough is a small intertidal bay where the same species is cultured at a reduced scale, with current biomass less than 500 tonnes FW. The model showed that the standing stock can be increased from 200 tonnes FW to approximately 1500 tonnes FW before any decrease of the production.

引用

页码：379 / 394

页数：15

共 22 条

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