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首页> 外文期刊>Comparative parasitology >The Ecological Significance of Helminth Endoparasites on the Physiological Performance of Two Sympatric Fishes
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The Ecological Significance of Helminth Endoparasites on the Physiological Performance of Two Sympatric Fishes

机译：蠕虫内寄生虫对两种同伴鱼生理行为的生态学意义。

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We investigated the effects of helminth endoparasite load on the physiological performance of 2 sympatric fishes, Lepomis macrochirus and Lepomis megalotis (Centrarchidae). Species-specific swimming endurance and thermal tolerance were used as measures of physiological performance, A discriminant function analysis for endurance indicated that only kidney parasite load significantly correlated with the first discriminant function. However, overall increases in parasite load within the mesentery, hearty liver, and small intestine were each associated with observed decreases in endurance for both species. A discriminant function analysis also indicated that increases in mesentery and liver parasite load were significantly correlated with decreases in thermal tolerance. An overall increase in parasite load within the mesentery, heart, liver, small intestine, and spleen was also correlated with decreased thermal tolerance. Thus, our results suggest that helminth endoparasite load may play an important role in the physiological performance of these sympatric fishes.. Differences in microhabitat utilization and partitioning of L. macrochirus and L. megalotis correlate with species-specific physiological performance. For example, microhabitats with greater current velocities are used by L. megalotis because of the greater capacity of this species for endurance. However, parasite loads that significantly reduce endurance would force changes in habitat utilization causing direct competition among species normally partitioned. We offer a theoretical discussion of how parasite load may create opportunities for interaction and competition among individuals and species usually partitioned by physiologically based preferences in microhabitat utilization.
机译：我们调查了蠕虫体内寄生虫负荷对2种同伴鱼Lepomis macrochirus和Lepomis megalotis（Centrarchidae）的生理性能的影响。特定物种的游泳耐力和耐热性被用作生理性能的量度。耐力的判别功能分析表明，只有肾脏寄生虫负荷与第一判别功能显着相关。然而，肠系膜，heart肝和小肠内寄生虫总负荷的增加均与两种物种的耐力下降有关。判别功能分析还表明，肠系膜和肝脏寄生虫负荷的增加与热耐受性的降低显着相关。肠系膜，心脏，肝脏，小肠和脾脏中寄生虫负荷的总体增加也与耐热性降低有关。因此，我们的结果表明，蠕虫体内的寄生虫负荷可能在这些同伴鱼类的生理性能中起重要作用。L. macrochirus和L. megalotis在微生境利用和分配方面的差异与特定物种的生理性能有关。例如，巨型线虫使用具有更高流速的微生境，因为该物种具有更大的耐力。但是，显着降低耐用性的寄生虫负荷将迫使栖息地利用发生变化，从而导致通常划分的物种之间发生直接竞争。我们提供了一个理论上的讨论，即寄生虫负荷如何为个体和物种之间的相互作用和竞争创造机会，这些个体和物种通常由微生境利用中基于生理学的偏好来划分。

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