Characterizing the role of phosphorus availability and periphytic algae in the food choice and performance of detritivorous caddisflies (Trichoptera:Limnephilidae)

IF 1.7 4区 环境科学与生态学 Q3 ECOLOGY
Freshwater Science Pub Date : 2021-11-05 DOI:10.1086/717953
Lee M. Demi, Donovan Hughes, B. W. Taylor
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引用次数: 0

Abstract

Organisms that rely on detritus as their primary food source may face particularly strong nutritional constraints on growth and development, given the characteristically poor quality of detrital resources. In freshwater ecosystems, the low content of P in detritus often limits detritivore growth. Additionally, a growing body of evidence suggests the biochemical composition of algae, such as essential fatty acids, can limit aquatic detritivore growth. We investigated feeding preference and growth responses of common aquatic detritivores by performing paired feeding-preference and growth experiments on 4 species of larval caddisflies (Trichoptera) from the family Limnephilidae: Asynarchus nigriculus, Anabolia bimaculata, Limnephilus externus, and Ecclisomyia sp. We manipulated both the P content and epiphytic algal biomass of a common detrital food resource (decomposing sedge [Carex sp.]) by conditioning the detritus under 2 different light (ambient, shaded) and P (ambient [low], +P) regimes. We tested 3 hypotheses that describe feeding preferences and performance under different scenarios of P limitation, algal limitation, and co-limitation by P and algae. We observed evidence of preferential feeding behavior for each of the 4 taxa, with 2 species exhibiting preferences for conditioned detritus with high algal biomass and 2 for detritus from the +P treatments. We observed agreement between feeding preferences and performance (growth, growth efficiency, mortality) for only 2 taxa, with A. nigriculus exhibiting higher growth rates and growth efficiency on their preferred high-P detritus, and L. externus experiencing lower mortality when reared on their preferred high algal biomass detritus. These findings provide an initial step toward characterizing the feeding preferences and performance responses of aquatic detritivores to 2 potentially common nutritional constraints: detrital P and algal supply.
磷有效性和周边藻类在碎屑石蛾食物选择和性能中的作用的表征(毛翅目:灰蝶科)
鉴于碎屑资源的质量较差,以碎屑为主要食物来源的生物在生长和发育方面可能面临特别严重的营养限制。在淡水生态系统中,碎屑中磷含量低往往限制了碎屑动物的生长。此外,越来越多的证据表明,藻类的生物化学成分,如必需脂肪酸,会限制水生碎屑动物的生长。通过对褐藻科的4种幼虫(毛翅目)进行配对进食偏好和生长实验,研究了常见水生碎屑食草动物的进食偏好和成长反应。我们通过在两种不同的光照(环境光照,遮荫)和磷照(环境[低],+P)条件下调节碎屑,来控制常见碎屑食物资源(分解莎草[Carex sp])的磷含量和附生藻类生物量。我们测试了3个假设,这些假设描述了在磷限制、藻类限制以及磷和藻类共同限制的不同情景下的喂养偏好和表现。我们观察到4个分类群中每个分类群都有优先觅食行为的证据,其中2个物种对藻类生物量高的条件碎屑表现出偏好,2个物种则对+P处理的碎屑表现出喜好。我们仅观察到2个分类群的饲养偏好和性能(生长、生长效率、死亡率)之间的一致性,黑曲霉在其首选的高磷碎屑上表现出更高的生长速率和生长效率,而外部乳杆菌在其首选高藻类生物量碎屑上饲养时死亡率较低。这些发现为表征水生碎屑动物对两种潜在的常见营养约束的进食偏好和性能反应迈出了第一步:碎屑磷和藻类供应。
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来源期刊
Freshwater Science
Freshwater Science ECOLOGY-MARINE & FRESHWATER BIOLOGY
CiteScore
4.10
自引率
0.00%
发文量
49
审稿时长
6-12 weeks
期刊介绍: Freshwater Science (FWS) publishes articles that advance understanding and environmental stewardship of all types of inland aquatic ecosystems (lakes, rivers, streams, reservoirs, subterranean, and estuaries) and ecosystems at the interface between aquatic and terrestrial habitats (wetlands, riparian areas, and floodplains). The journal regularly features papers on a wide range of topics, including physical, chemical, and biological properties of lentic and lotic habitats; ecosystem processes; structure and dynamics of populations, communities, and ecosystems; ecology, systematics, and genetics of freshwater organisms, from bacteria to vertebrates; linkages between freshwater and other ecosystems and between freshwater ecology and other aquatic sciences; bioassessment, conservation, and restoration; environmental management; and new or novel methods for basic or applied research.
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