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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Habitat dependant growth of three species of bottom settling fish in a coastal fjord
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Habitat dependant growth of three species of bottom settling fish in a coastal fjord

机译：栖息在沿海峡湾的三种底栖鱼类的生长

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摘要

Settlement of juvenile fish is often associated with structurally complex habitat such as eelgrass (Zostera marina L). We tested whether juvenile Greenland cod (Gadus ogac Richardson), Atlantic cod (G. morhua L), and white hake (Urophycis tenuis Mitchill) have higher feeding and growth rates in structurally complex eelgrass habitat compared to barren seafloor or the water column. We conducted five single species field experiments from September 2002-October 2003, to test whether juvenile Greenland cod, Atlantic cod, and white hake had higher feeding and growth rates in structurally complex eelgrass habitat compared to barren seafloor or the water column. In two experiments with G. ogac, growth rates did not differ among habitats in autumn 2002, but in autumn 2003 fish grew fastest in the water column (0.449 ± 0.055% · d~(-1)) compared to barren (0372 ± 0.028% · d~(-1)) or eelgrass habitats (0.254±0.013% · d~(-1)). In two experiments with G. morhua, growth rates over the winter (2002-2003) did not differ among habitats, but in spring of 2003 growth was significantly greater in eelgrass (0.366±0.026% · d~(-1)) compared to barren (0.327 ± 0.035% · d~(-1)) or water column habitats (0.065± 0.013% · d~(-1)). In one experiment with U. tenuis, growth was faster in eelgrass (0.713 ± 0.062% · d~(-1)) than barren (0.483±0.055% · d~(-1)) or water column habitats (0.271 ±0.040% · d~(-1)). Zooplankton abundance was consistently highest among seafloor habitats (i.e., eelgrass and barren substrate) and lowest in the water column. More food (by weight) was consumed by U. tenuis and G. ogac in eelgrass than other habitats, while G. morhua consumed the most food over barren substrate. Results are generally consistent with predictions of higher growth rates and food rations among seafloor habitats for white hake and Atlantic cod. Greenland cod did not grow as predicted indicating that potential trade-offs in habitat selection may vary with season and the response to habitat is not uniform among species.
机译：幼鱼的定居常常与结构复杂的生境有关，例如鳗e（Zostera marina L）。我们测试了格陵兰鳕鱼（Gadus ogac Richardson），大西洋鳕鱼（G. morhua L）和白鳕（Urophycis tenuis Mitchill）在结构复杂的鳗草栖息地中的觅食和生长速率是否高于贫瘠的海底或水柱。从2002年9月至2003年10月，我们进行了五个单物种野外试验，以测试与贫瘠的海底或水柱相比，幼稚的格陵兰鳕鱼，大西洋鳕鱼和白鳕在结构复杂的鳗草栖息地中是否具有较高的摄食和生长速率。在两次G. ogac实验中，2002年秋季生境之间的生长率没有差异，但与贫瘠的（0372±0.028）相比，2003年秋季水柱中的鱼生长最快（0.449±0.055％·d〜（-1）） ％·d〜（-1））或鳗草栖息地（0.254±0.013％·d〜（-1））。在两个G. morhua的实验中，不同生境之间冬季（2002-2003）的生长速率没有差异，但是与2003年春季相比，鳗草的生长显着更高（0.366±0.026％·d〜（-1））。贫瘠（0.327±0.035％·d〜（-1））或水柱生境（0.065±0.013％·d〜（-1））。在一项使用U. tenuis的实验中，鳗草（0.713±0.062％·d〜（-1））的生长快于贫瘠（0.483±0.055％·d〜（-1））或水柱生境（0.271±0.040％） ·d〜（-1））。在海底生境（鳗草和贫瘠的底物）中，浮游动物的丰度一直最高，而在水柱中则最低。鳗草中的U. tenuis和G. ogac消耗的食物（按重量计）比其他生境多，而Morhua的贫瘠底物消耗的食物最多。结果通常与白鳕鱼和大西洋鳕鱼海底生境中较高的生长速率和食物配给量的预测一致。格陵兰鳕鱼未如预期的那样生长，表明生境选择的潜在权衡可能随季节而变化，并且物种间对生境的反应也不统一。

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    M.D. Renkawitz; R.S. Gregory; D.C. Schneider;

  • 作者单位

    Memorial University of Newfoundland and Labrador, Ocean Sciences Centre, St. John's, Newfoundland, Canada A1B 3X9,U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Marine Fisheries Service, Northeast Fisheries Science Center, 166 Water Street, Woods Hole, MA 02543, USA;

    Department of Fisheries & Oceans Canada, Ecological Sciences Section & Centre of Expertise for Aquatic Habitat Research, PO Box 5667, 80 East White Hills Road St.John 's, Newfoundland and Labrador, Canada A1C 5X1;

    Memorial University of Newfoundland and Labrador, Ocean Sciences Centre, St. John's, Newfoundland, Canada A1B 3X9;

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  • 正文语种 eng
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  • 关键词

    atlantic cod; eelgrass; greenland cod; growth rates; habitat complexity; white hake;

    机译：大西洋鳕鱼鳗草格陵兰鳕鱼增长率;生境复杂性;白无须鳕;

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