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Stomach contents of the Pacific sharpnose shark, Rhizoprionodon longurio (Carcharhiniformes, Carcharhinidae) in the southeastern Gulf of California

机译:太平洋Sharpnose Shark,Rhizopionodon龙莲(Carcharliniformes,Carcharhinidae)在加利福尼亚州东南部的胃内容物

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摘要

The feeding habits of the sharpnose shark Rhizoprionodon longurio of the SE Gulf of California are described using the stomach contents of 250 specimens (135 males and 115 females) obtained weekly from December 2007 to March 2008 in the two main landing sites of the artisanal fishing fleet of Mazatlan. The mean total length (TL) was 77.7 ± 12.8 cm and the respective ranges for males and females were 60-120 cm and 52120 cm. Size distribution showed two modal groups (juveniles: 52-80 cm, mode 72.5 cm, and adults: 85-140 cm, mode 92.5 cm). Out of the 395 preys identified in 235 stomachs with identifiable contents, the most important were cephalopods (Index of Relative Importance, IRI = 93.1%), mainly Argonauta spp. (IRI = 92.9%). The total IRI value for fish was 5.9%, mostly represented by Oligoplites refulgens and Oligoplites sp. (joint IRI value = 4.8%). The diversity of the stomach contents of males and females was not significantly different, and although the values of diversity, equitability and dietary breadth indexes were lower in juveniles than in adults, ANOSIM analysis did not show differences in dietary habits related to age and sex. The results indicate a specialized feeding behaviour, with Argonauta spp. as preferred prey. This behaviour does not agree with all previous information on R. longurio, and is probably due to local availability of this prey during the sampling period.
机译:利用2007年12月至2008年3月在手工渔船的两个主要着陆地点,使用250次标本(135名男性和115名女性)的胃含量,描述了加利福尼亚州Se Shark Rhizoprodon龙莲的饲养习惯。 Mazatlan。平均总长度(TL)为77.7±12.8厘米,雄性和女性的相应范围为60-120厘米,52120厘米。尺寸分布显示两种模态群体(幼年:52-80厘米,模式72.5厘米,成人:85-140厘米,模式92.5厘米)。在具有可识别内容的235粒胃中鉴定的395次捕食中,最重要的是头孢氨酸(相对重要性指数,IRI = 93.1%),主要是Argonauta SPP。 (IRI = 92.9%)。鱼的总价值为5.9%,主要由寡头岩和oligoplites sp表示。 (联合IRI值= 4.8%)。男性和女性的胃含量的多样性并没有显着差异,尽管少年的多样性,公式和饮食宽度指数的价值低于成人,但Anosim分析并未显示出与年龄和性别相关的饮食习惯的差异。结果表明了具有Argonauta SPP的专用饲养行为。作为优先的猎物。此行为不同意以上所有关于R. Longuro的信息,并且可能是由于在采样期间局部可用性。

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