Niche Partitioning Among Three Apex Piscivorous Fishes: Evidence of Limited Intraguild Predation

IF 1.3 3区 农林科学 Q3 FISHERIES
Robert W. Eckelbecker, Christopher S. Guy, Paul C. Gerrity, Joe W. Deromedi, Travis E. Neebling, Mark A. Smith
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Abstract

This study aimed to understand the ecological relationship among burbot Lota lota, brown trout Salmo trutta and lake trout Salvelinus namaycush, with a focus on burbot, a species of greatest conservation need in Wyoming. While we hypothesised a reciprocal intraguild predation dynamic, where competition and predation occur between predators based on size or age structure, our findings provided limited support for this hypothesis. Both dietary overlap and trophic position were minimal among burbot, brown trout and lake trout. Instances of reciprocal predation were rare; no predation between burbot and lake trout was observed; and brown trout was the only species consumed by all predators (burbot 0.02 mean proportion by weight; lake trout 0.09 mean proportion by weight). Predation by brown trout on burbot was negligible, contributing only 0.01 to the mean proportion by weight and frequency of occurrence. Additionally, both burbot and brown trout were less piscivorous than expected, with fish comprising 0.36 and 0.17 of their mean proportion by weight in their overall diets, respectively. Overall, our findings suggest that these predators coexist with limited competitive or predatory interactions, likely due to differences in prey selection.

Abstract Image

三种顶端食鱼鱼类的生态位分配:有限的内部捕食证据
本研究以美国怀俄明州最需要保护的湖鳟(burbot)为研究对象,探讨了湖鳟(Salvelinus namaycush)、褐鳟(Salmo trutta)和湖鳟(Lota Lota)之间的生态关系。虽然我们假设了一种互惠的动物内部捕食动态,即捕食者之间根据体型或年龄结构发生竞争和捕食,但我们的发现对这一假设提供了有限的支持。红鳟鱼、褐鳟鱼和湖鳟鱼的饮食重叠和营养地位最小。相互捕食的例子很少;白鲑与湖鳟鱼之间未见捕食现象;褐鳟是唯一被所有捕食者吃掉的物种(burbot的平均重量比例为0.02;湖鳟平均重量比例为0.09)。褐鳟对burbot的捕食几乎可以忽略不计,仅占其平均重量和发生频率的0.01。此外,burbot和褐鳟的食鱼性都低于预期,鱼分别占其总饮食中体重平均比例的0.36%和0.17%。总的来说,我们的研究结果表明,这些捕食者共存于有限的竞争或捕食相互作用中,可能是由于猎物选择的差异。
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来源期刊
Ecology of Freshwater Fish
Ecology of Freshwater Fish 农林科学-海洋与淡水生物学
CiteScore
4.10
自引率
0.00%
发文量
45
审稿时长
12-24 weeks
期刊介绍: Ecology of Freshwater Fish publishes original contributions on all aspects of fish ecology in freshwater environments, including lakes, reservoirs, rivers, and streams. Manuscripts involving ecologically-oriented studies of behavior, conservation, development, genetics, life history, physiology, and host-parasite interactions are welcomed. Studies involving population ecology and community ecology are also of interest, as are evolutionary approaches including studies of population biology, evolutionary ecology, behavioral ecology, and historical ecology. Papers addressing the life stages of anadromous and catadromous species in estuaries and inshore coastal zones are considered if they contribute to the general understanding of freshwater fish ecology. Theoretical and modeling studies are suitable if they generate testable hypotheses, as are those with implications for fisheries. Manuscripts presenting analyses of published data are considered if they produce novel conclusions or syntheses. The journal publishes articles, fresh perspectives, and reviews and, occasionally, the proceedings of conferences and symposia.
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