首页 | 本学科首页   官方微博 | 高级检索  
   检索      


Year-class strength regulation in plaice (Pleuronectes platessa L.) on the Swedish west coast
Authors:Leif Pihl
Institution:(1) Department of Zoology, University of Gothenburg, Kristineberg Marine Biological Station, S-450 34 Fiskebäckskil, Sweden;(2) Present address: Virginia Institute of Marine Science, 23062 Gloucester Point, Virginia, USA
Abstract:Year-class strength of plaice (Pleuronectes platessa) has been studied over periods of 10 and 35 years, respectively, in two shallow sandy areas on the Swedish west coast. In one area, Gullmar Bay (N 58 ° 19prime – W 11 ° 33prime), 0-group plaice were sampled quantitatively with a drop trap at 0–0.7 m depth and densities between 0.2 and 3.8 ind./m2 were recorded in early summer. In the other area, Laholm Bay (N 56 ° 30prime – W 12 ° 55prime), 0-group plaice were sampled semi-quantitatively in August with young-fish trawl at 1.5 m depths. Densities between 0.001 and 0.28 ind./m2 were assessed.The effects of temperature and wind (in the winter and early spring) and predation (in early summer), on the recruitment of 0-group plaice were investigated. In Gullmar Bay high recruitment occurred after severe winters and in years when on-shore winds dominated during spring. No such correlations were found in Laholm Bay. In Gullmar Bay a significant inverse relationship was found between the density of O-group plaice in early summer and the biomass of brown shrimp (Crangon crangon) and the shore crab (Carcinus maenas), the main predators in the nursery area.The importance of physical and biological factors regulating recruitment in plaice are discussed.
Keywords:Pleuronectes platessa L  recruitment  year-class strength  predation  Skagerrak- Kattegat
本文献已被 SpringerLink 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号