Habitat scale and seasonality influence macroinvertebrate functional feeding groups in a tropical Kenyan montane stream

IF 1.1 4区 环境科学与生态学 Q3 MARINE & FRESHWATER BIOLOGY African Journal of Aquatic Science Pub Date : 2023-07-03 DOI:10.2989/16085914.2023.2249507
Frank O. Masese, Augustine Sitati, Mourine J. Yegon, Elizabeth W. Wanderi, P. Raburu
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Abstract

Habitat quality and diversity strongly influence the composition of macroinvertebrate communities in lotic ecosystems. We evaluated the functional organization of macroinvertebrates in response to changes in habitat type and seasonality in the Afromontane Moiben River in western Kenya. In-stream substrate characteristics were evaluated at the reach, channel unit/habitat and microhabitat scales at nine sites in different land-use areas. Water and habitat quality were assessed during the dry (January–March) and wet (April–June) seasons. A total of 81 macroinvertebrate samples were collected every month from three channel units (pools, riffles and runs) defined by different substrate types and classified into five functional feeding groups (FFGs): collector-filterers, collector-gatherers, predators, scrapers and shredders. Numerical abundance differed significantly between FFGs, with gatherers > filterers > predators > scrapers > shredders. Coarse substrate (bedrock, boulders and cobbles) in riffles had the highest richness and abundance of filterers and scrapers while sand, mud and detritus in pools recorded the lowest richness and abundance. Shredders and scrapers occurred predominantly in upstream sites with minimal human disturbance, while gatherers were most abundant at disturbed sites. The greatest variability in FFGs was at the smallest microhabitat scale, and not at the reach scale. This study shows that attention should be given to both reach-scale and in-stream disturbances when assessing the ecological condition of streams and rivers.
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栖息地规模和季节性对肯尼亚热带山地溪流中大型无脊椎动物功能摄食群的影响
栖息地的质量和多样性对地层生态系统中大型无脊椎动物群落的组成有很大影响。我们评估了肯尼亚西部非洲蒙地莫伊本河(Afromontane Moiben River)中大型无脊椎动物的功能组织对生境类型和季节性变化的响应。我们在不同土地利用区的九个地点对河段、河道单元/生境和微生境尺度上的河道底质特征进行了评估。在旱季(1 月至 3 月)和雨季(4 月至 6 月)对水质和栖息地质量进行了评估。每月从不同基质类型定义的三个河道单元(水池、涟漪和流水)中收集了共计 81 个大型无脊椎动物样本,并将其分为五个功能摄食群组(FFGs):采集-过滤群组、采集-采集群组、捕食群组、刮食群组和撕碎群组。FFG 之间的数量丰度差异显著,采集者>过滤者>捕食者>刮食者>碎食者。溪流中粗底质(基岩、巨石和鹅卵石)的滤食者和刮食者的丰富度和丰度最高,而水池中沙、泥和碎屑的丰富度和丰度最低。碎食者和刮食者主要出现在人为干扰最小的上游地点,而采集者在干扰地点最多。FFGs 的最大变化出现在最小的微生境尺度上,而不是在河段尺度上。这项研究表明,在评估溪流和河流的生态状况时,应同时关注河段尺度和河流内部的干扰。
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来源期刊
African Journal of Aquatic Science
African Journal of Aquatic Science MARINE & FRESHWATER BIOLOGY-
CiteScore
3.90
自引率
7.10%
发文量
31
审稿时长
>12 weeks
期刊介绍: The African Journal of Aquatic Science is an international journal devoted to the study of the aquatic sciences, covering all African inland and estuarine waters. The Journal publishes peer-reviewed original scientific papers and short articles in all the aquatic science fields including limnology, hydrobiology, ecology, conservation, biomonitoring, management, water quality, ecotoxicology, biological interactions, physical properties and human impacts on African aquatic systems.
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