Importance of Shellfish in the Diet of Two Ray Species (Rhinoptera steindachneri and Hypanus dipterurus) in the Upper Gulf of California

IF 1.3 4区 农林科学 Q3 FISHERIES
M. D. R. Simental‐Anguiano, Y. Torres-Rojas, F. Galván‐Magaña, A. Tripp-Quezada
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引用次数: 1

Abstract

ABSTRACT The upper Gulf of California, Mexico is a marine protected area (MPA), considered important for the conservation and protection of species. The present study assessed the resource–consumer interactions of two ray species (Rhinoptera steindachneri and Hypanus dipterurus), to know the importance of shellfish in the food-web dynamics of two predators present in this MPA. A total of 33 prey species for R. steindachneri and 48 prey species for H. dipterurus were recorded. The bivalve Tellina subtrigona (%IRI = 99.5) was the most important species in the diet of R. steindachneri; whereas the gastropod Mitrella dorma (%IRI = 32.7) was the primary prey of H. dipterurus. The ray R. steindachneri had a lower Shannon's index of diversity (H' = 0.49) than H. dipterurus (H' = 1.41). Based on Amundsen's graphical method, R. steindachneri have a specialist feeding strategy; whereas H. dipterurus presented a mixed strategy that includes both specialist and generalist organisms. However, the trophic specialization evidenced by these rays may reflect the grouping behavior of their prey, which tend to form large aggregations. Both ray species are secondary consumers (TLR. steindachneri = 3.10 and TL H. dipterurus = 3.12) of shellfish. Nevertheless, there is a low similarity in the prey species composition between them (ANOSIM: R = 0.47), indicating that these two ray species have different diets, and therefore, each ray species has specific resource–consumer interactions. This information allows to understand the importance of shellfish in the food-web dynamics in the ecosystem and MPA effectiveness in the upper Gulf of California for species at risk, like ray species.
贝类在加利福尼亚上湾两种鳐鱼(Rhinoptera steindachneri和Hypanus dipteurus)饮食中的重要性
摘要墨西哥加利福尼亚湾上游是一个海洋保护区(MPA),被认为对物种的保护具有重要意义。本研究评估了两种鳐鱼(Rhinoptera steindachneri和Hypanus dipteurus)的资源-消费者相互作用,以了解贝类在该MPA中存在的两种捕食者的食物网动态中的重要性。共记录到33种施坦达奇龙的猎物和48种双尾龙的猎物。双壳类Tellina subrigona(%IRI=99.5)是施泰恩达奇奈里(R.steindachneri)日粮中最重要的物种;而睡鼠腹足类Mitrella dorma(%IRI=32.7)是双尾龙的主要猎物。施氏鳐的Shannon多样性指数(H’=0.49)低于双尾龙(H’=1.41);而H.Dipteurus提出了一种混合策略,包括专业生物和多面手生物。然而,这些射线所证明的营养特化可能反映了它们的猎物的分组行为,这些猎物往往会形成大的聚集。这两种鳐鱼都是贝类的次级消费者(TLR.steindachneri=3.10,TL H.Dipteurus=3.12)。然而,它们之间的猎物种类组成相似性很低(ANOSIM:R=0.47),这表明这两种鳐鱼有不同的饮食,因此,每种鳐鱼都有特定的资源-消费者互动。这些信息有助于了解贝类在生态系统食物网动态中的重要性,以及加利福尼亚湾上游对射线物种等风险物种的MPA有效性。
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来源期刊
Journal of Shellfish Research
Journal of Shellfish Research 生物-海洋与淡水生物学
CiteScore
2.30
自引率
0.00%
发文量
40
审稿时长
6 months
期刊介绍: Original articles dealing with all aspects of shellfish research will be considered for publication. Manuscripts will be judged by the editors or other competent reviewers, or both, on the basis of originality, content, merit, clarity of presentation, and interpretations.
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