Ability of grazing fish to generate particulate organic matter derived from autochthonous primary production

IF 1.6 3区 农林科学 Q3 FISHERIES
Shin-ichiro Abe, Daiki Hoshino, Kei’ichiro Iguchi
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引用次数: 1

Abstract

Grazing fish play a role of controlling autochthonous primary production and converting it to secondary production by consuming benthic algae. Moreover, they will also provide autochthonous particulate organic matter (POM) for freshwater ecosystems by dislodging the benthic algal matrix while feeding. However, it has not been confirmed whether grazing fish induce POM production during their feeding on benthic algae. To verify this POM production during grazing by fish, short-term (90 min) feeding experiments were conducted by introducing grazing fish Plecoglossus altivelis into indoor aquaria with benthic algal mats. We found that the fish can generate POM by feeding on benthic algae. Although POM was generated in the aquaria where the fish had not grazed on the benthic algal mats at all, the concentration of POM in the aquaria increased with the frequency of the acts of scraping benthic algae by the fish. Furthermore, we observed that the fish egested faeces which corresponded to about 44% on average of the ingested benthic organic matter. In some cases, the fish generated POM that corresponded to 88% of the removed (dislodged and ingested) benthic organic matter through their feeding and defecation. This study suggested that grazing fish have a function of providing autochthonous POM to freshwater ecosystems both via dislodging benthic algae during feeding and through egestion of consumed benthic algae.

放牧鱼类产生源自本地初级生产的颗粒有机物的能力
食草鱼类通过食用底栖藻类,控制原生初级生产并将其转化为次级生产。此外,它们在取食时还会通过移走底栖藻类基质,为淡水生态系统提供原生颗粒有机物(POM)。然而,食草鱼类在捕食底栖藻类的过程中是否会诱发POM的产生尚未得到证实。为了验证鱼类在放牧过程中产生的POM,将放牧鱼Plecoglossus altivelis引入有底栖藻垫的室内水族箱,进行了短期(90 min)饲养实验。我们发现这种鱼可以通过食用底栖藻类来产生聚甲醛。虽然POM是在鱼完全没有吃底栖藻垫的水族箱中产生的,但随着鱼吃底栖藻的频率增加,水族箱中POM的浓度也随之增加。此外,我们观察到鱼类排出的粪便平均约占摄入底栖生物有机物的44%。在某些情况下,鱼类产生的POM相当于通过进食和排便去除(排出和摄入)底栖有机物质的88%。本研究表明,食草鱼类通过在摄食过程中移除底栖藻类和通过消耗底栖藻类的排泄,为淡水生态系统提供原生的POM。
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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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