Reproductive Status of Callinectes sapidus as an Indicator of Spawning Habitat in the South Atlantic Bight, USA

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• 作者：Matthew B. Ogburn ; Leigh C. Habegger
• 关键词：Spawning stock ; Callinectes sapidus ; Habitat ; Reproductive status ; Stock assessment
• 刊名：Estuaries and Coasts
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：38
• 期：6
• 页码：2059-2069
• 全文大小：894 KB
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  Hines, A.H., E.G. Johnson, M.Z. Darne
• 作者单位：Matthew B. Ogburn (1) (2)
  Leigh C. Habegger (3)
  
  1. Savannah State University, 3219 College Street, Savannah, GA, 31404, USA
  2. Smithsonian Environmental Research Center, 647 Contees Wharf Road, Edgewater, MD, 21037, USA
  3. University of Rhode Island, Kingston, RI, 02881, USA
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Environment
  Ecology
  Geosciences
  Environmental Management
  Nature Conservation
  
• 出版者：Springer New York
• ISSN：1559-2731

文摘

Stocks of estuarine migrant species can be challenging to assess due to a relative lack of abundance data in offshore areas and complex interactions between spawning behavior and estuarine geomorphology. The blue crab Callinectes sapidus in the South Atlantic Bight (SAB), USA, inhabits estuaries ranging from large semi-enclosed bays to narrow river mouths where estuarine conditions extend onto the continental shelf. Mature female reproductive status was used as an indicator to identify spawning habitat, and data from long-term fishery independent surveys were used to evaluate spatiotemporal trends in abundance of spawning females. Long-term data (1990-011) were obtained from the Southeast Area Marine Assessment Program (SEAMAP) South Atlantic survey and the Georgia Ecological Monitoring Trawl Survey. Biological samples were obtained from estuarine and offshore areas of Georgia for a detailed analysis of habitat use. Reproductive status of mature female blue crabs (ovigery, ovary development, egg remnants) was indicative of a summer peak in spawning in Georgia that occurred primarily on the continental shelf as far as 13 km offshore. SEAMAP data provide strong evidence that blue crab females spawn on the continental shelf throughout the SAB, with substantial declines in spawner abundance over time. Empirical orthogonal function analysis of SEAMAP time series was indicative of regional spawning areas defined by biogeography which are poorly aligned with fishery management jurisdictions. Indicators of reproductive status provided a powerful method for identifying spawning habitats of an estuarine migrant species, especially when spawners may disperse over the continental shelf and occur at low density. Keywords Spawning stock Callinectes sapidus Habitat Reproductive status Stock assessment