Spatial and trophic overlap of marked and unmarked Columbia River Basin spring Chinook salmon during early marine residence with implications for competition between hatchery and naturally produced fish

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• 作者：Elizabeth A. Daly (1) elizabeth.daly@oregonstate.edu
  Richard D. Brodeur (2)
  Joseph P. Fisher (3)
  Laurie A. Weitkamp (2)
  David J. Teel (4)
  Brian R. Beckman (5)
• 关键词：Columbia River Basin – ; Marine – ; Juvenile Chinook salmon – ; Spatial – ; Trophic – ; Competition – ; Hatchery – ; Wild
• 刊名：Environmental Biology of Fishes
• 出版年：2012
• 出版时间：May 2012
• 年：2012
• 卷：94
• 期：1
• 页码：117-134
• 全文大小：1.7 MB
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• 作者单位：1. Cooperative Institute for Marine Resources Studies, Oregon State University, Newport, OR 97365, USA2. NOAA Fisheries, Northwest Fisheries Science Center, Newport, OR 97365, USA3. Cooperative Institute for Marine Resources Studies, Oregon State University, Corvallis, OR 92331, USA4. NOAA Fisheries, Northwest Fisheries Science Center, Manchester, WA 98353, USA5. NOAA Fisheries, Northwest Fisheries Science Center, Seattle, WA 98112, USA
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Environment
  Nature Conservation
  Animal Systematics/Taxonomy/ Biogeography
  Zoology
  Hydrobiology
  
• 出版者：Springer Netherlands
• ISSN：1573-5133

文摘

Ecological interactions between natural and hatchery juvenile salmon during their early marine residence, a time of high mortality, have received little attention. These interactions may negatively influence survival and hamper the ability of natural populations to recover. We examined the spatial distributions and size differences of both marked (hatchery) and unmarked (a high proportion of which are natural) juvenile Chinook salmon in the coastal waters of Oregon and Washington from May to June 1999–2009. We also explored potential trophic interactions and growth differences between unmarked and marked salmon. Overlap in spatial distribution between these groups was high, although catches of unmarked fish were low compared to those of marked hatchery salmon. Peak catches of hatchery fish occurred in May, while a prolonged migration of small unmarked salmon entered our study area toward the end of June. Hatchery salmon were consistently longer than unmarked Chinook salmon especially by June, but unmarked salmon had significantly greater body condition (based on length-weight residuals) for over half of the May sampling efforts. Both unmarked and marked fish ate similar types and amounts of prey for small (station) and large (month, year) scale comparisons, and feeding intensity and growth were not significantly different between the two groups. There were synchronous interannual fluctuations in catch, length, body condition, feeding intensity, and growth between unmarked and hatchery fish, suggesting that both groups were responding similarly to ocean conditions.