Feeding Ecology of Blue Marlins, Dolphinfish, Yellowfin Tuna, and Wahoos from the North Atlantic Ocean and Comparisons with other Oceans
Feeding Ecology of Blue Marlins, Dolphinfish, Yellowfin Tuna, and Wahoos from the North Atlantic Ocean and Comparisons with other Oceans
复制标题
北大西洋蓝马林鱼、海豚鱼、黄鳍金枪鱼和鲅鱼的摄食生态及其与其他海洋的比较
DOI：
10.1577/t09-105.1
复制
发表时间：
2010
影响因子：
1.4
通讯作者：
Tyler W. Averett
中科院分区：
文献类型：
--
作者：
P. Rudershausen;J. Buckel;J. Edwards;Damon P. Gannon;C. M. Butler;Tyler W. Averett
我们研究了蓝马林鱼Makaira nigricans，Coryphaena hippurus，黄鳍金枪鱼Thunnus albacares，1998-2000年和2003年，在北大西洋西部的大岩蓝马林锦标赛（BRT）上，2009年和2002年至2004年在BRT外捕获的银汉鱼。鲭是蓝马林鱼、黄鳍金枪鱼和瓦胡的重要猎物;其他经常食用的猎物包括头足类（黄鳍金枪鱼和瓦胡）和外腔棘鱼（黄鳍金枪鱼）。海豚的饮食包括exocoetids，portunids，和同种作为重要的猎物。蓝马林鱼和瓦胡消耗相对较少的猎物物种（即，低的饮食生态位宽度），而黄鳍金枪鱼具有最高的饮食生态位宽度;黄鳍金枪鱼具有中间的生态位宽度值。最大猎物的大小增加，鱼的大小，然而，消费与藻类马尾藻属的小猎物。发生在整个大小范围的鱼检查。大多数种间的饮食重叠值与蓝鳍金枪鱼并不显着，但是，蓝马林鱼，黄鳍金枪鱼，和wahoos有显着的饮食重叠，由于他们依赖于鲭类的猎物。在蓝马林鱼，鱼，和wahoos中发现的猎物类型更一致的BRT年比猎物中发现的黄鳍金枪鱼。黄鳍金枪鱼和wahoos在BRT年收集的猎物与历史（20世纪80年代初）饮食数据从北卡罗来纳州，墨西哥湾，巴哈马群岛。根据主成分分析，饮食从几个海洋聚集在一起的蓝马林鱼，蓝鳍金枪鱼，黄鳍金枪鱼和瓦胡。虽然发现了差异，但每种捕食者的饮食在很大程度上是一致的，尽管捕鱼或环境变化可能产生影响，但在过去三十年墨西哥湾流（在各大洋之间）和空间上，海洋中的鱼类数量都在增加。
We examined diet, dietary niche width, diet overlap, and prey size-predator size relationships of blue marlins Makaira nigricans, dolphinfish Coryphaena hippurus, yellowfin tuna Thunnus albacares, and wahoos Acanthocybium solandri caught in the western North Atlantic Ocean during the Big Rock Blue Marlin Tournament (BRT) in 1998-2000 and 2003-2009 and dolphinfish captured outside the BRT from 2002 to 2004. Scombrids were important prey of blue marlins, yellowfin tuna, and wahoos; other frequently consumed prey included cephalopods (for yellowfin tuna and wahoos) and exocoetids (for yellowfin tuna). Dolphinfish diets included exocoetids, portunids, and conspecifics as important prey. Blue marlins and wahoos consumed relatively few prey species (i.e., low dietary niche width), while dolphinfish had the highest dietary niche width; yellowfin tuna had intermediate niche width values. Maximum prey size increased with dolphinfish size; however, the consumption of small prey associated with algae Sargassum spp. occurred across the full size range of dolphinfish examined. Most interspecific diet overlap values with dolphinfish were not significant; however, blue marlins, yellowfin tuna, and wahoos had significant diet overlap due to their reliance on scombrid prey. Prey types found in blue marlins, dolphinfish, and wahoos were more consistent among BRT years than prey found in yellowfin tuna. The prey of yellowfin tuna and wahoos collected during BRT years correlated with historic (early 1980s) diet data from North Carolina, the Gulf of Mexico, and the Bahamas. Based on principal components analysis, diets from several oceans clustered together for blue marlins, dolphinfish, yellowfin tuna, and wahoos. Although differences were found, the diets of each predator were largely consistent both temporally (e.g., over the past three decades in the Gulf Stream) and spatially (among oceans), despite potential effects of fishing or environmental changes.