Settlement and nursery habitats for demersal fishes on the continental shelf of the New York Bight
Settlement and nursery habitats for demersal fishes on the continental shelf of the New York Bight
复制标题
纽约湾大陆架底层鱼类的聚居地和繁殖地
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
Mark H. Malchoff
中科院分区：
文献类型：
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作者：
Brian P. Steves;R. Cowen;Mark H. Malchoff
尽管在河口和近岸环境中对幼鱼进行了广泛的研究，但令人惊讶的是，对近海定居和育苗区幼鱼的基本栖息地要求知之甚少。1996年6月至1997年7月，用两米横梁拖网调查了纽约湾外海陆架0龄(早期幼鱼)底栖鱼的定居和育苗栖息地。在3个跨陆架断面(深度20-95m)的21个站位的重复拖网，按月取样以确定种群生态(在659个拖网中采集了21,309条鱼)。在收集的47种物种中，33种包括0岁的青少年，25种包括接近定居大小的个体。两个优势种--平尾平尾轮虫和双线叉尾轮虫占0龄鱼总渔获量的88.9%。在所有0龄鱼中，94%是在夏季和秋季捕获的。加权平均值的比较和经典对应分析的使用确定了整个陆架的栖息地和苗圃生境主要是由深度、温度和一年中的时间来决定的。横跨大陆架的三个区域(内、中、外)各有不同的幼鱼群落。对重要近海物种幼体栖息地的分布和质量的了解应有助于改进对它们的管理。随着20世纪后半叶鱼类数量的减少，特别是在西北大西洋(McHugh，1972；NEFSC，1992)，渔业管理者
Although juvenile fish are studied extensively in estuarine and nearshore environments, surprisingly little is known about the basic habitat requirements of juveniles for offshore settlement and nursery areas. Between June 1996 and July 1997, settlement and nursery habitats of age-0 (early juvenile) demersal fish on the conti- nental shelf of the New York Bight were investigated by using a two-meter beam trawl. Replicate tows at 21 sta- tions along three cross-shelf transects (20-95 m depth), were sampled on a near monthly basis to determine gen- eral ecology (21,309 fish collected in 659 tows). Of the 47 species collected, 33 included age-0 juveniles, and 25 included near-settlement size individuals. The two dominant species, Pleuronectes fer- rugineus and Merluccius bilinearis, con- stituted 88.9% of the total catch of age-0 fish. Of all age-0 fish, 94% were collected during summer and fall. Comparisons of weighted means and the use of canoni- cal correspondence analysis determined that settlement and nursery habitats across the shelf are primarily delin- eated by depth, temperature, and time of year. Three zones across the shelf (inner, middle, and outer) each had dis- tinct juvenile fish assemblages. Knowl- edge gained about the distribution and quality of juvenile habitat for commer- cially important offshore species should facilitate their improved management. With the decrease in fish abun- dance in the latter half of the twen- tieth century, particularly in the Northwest Atlantic (McHugh, 1972; NEFSC, 1992), fisheries managers