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Partitioning of macroinvertebrate assemblages across temporary pools in an intermittent dryland river
Inland Waters ( IF 3.1 ) Pub Date : 2020-06-04 , DOI: 10.1080/20442041.2020.1738841
Rafaela Lima de Farias 1, 2 , Cristina Stenert 3 , Leonardo Maltchik 3 , Elvio Sergio Figueredo Medeiros 1
Affiliation  

ABSTRACT

Streams in arid regions are seen as mosaics of spatial/temporal landscapes, with high environmental heterogeneity and exerting strong influence on patterns, structure, and diversity of biotic communities. This study describes the richness and density of benthic macroinvertebrates in temporary pools across different sections of a dryland intermittent river catchment and characterizes the diversity partitioning at different spatial scales across the longitudinal gradient of the river. We hypothesized that the diversity of invertebrates is not homogeneously distributed among the different spatial scales but concentrated at the finer levels of pools and river reaches. The study was conducted in an intermittent river catchment in semiarid Brazil. Sampling was performed hierarchically, including 3 segments of the river (upper, middle, and a tributary), 3 reaches per segment, 3 sites per reach, and 3 microhabitats per site (n = 81). Macroinvertebrate diversity was evaluated at scales of river segment (β4), reach (β3), site (β2), and microhabitat (β1). Habitat structure was composed of a diverse array of elements that varied spatially. Scale-dependent spatial segregation of community composition was observed on macroinvertebrate assemblages. Diversity partitioning analysis reinforced the importance of broader spatial scales (β4) and lesser importance of finer spatial scales (β1 and β2) for the regional diversity in the dryland river catchment study site. Our observations reflect a combination of homogenization of assemblage composition and reduced diversity at finer scales, with a greater contribution of broader scales to the diversity.



中文翻译:

间歇性旱地河流中大型无脊椎动物种群跨临时池的划分

摘要

干旱地区的河流被看作是时空景观的马赛克,具有高度的环境异质性,并且对生物群落的格局,结构和多样性产生了强烈影响。这项研究描述了旱地间歇性河流流域不同断面的临时池底栖无脊椎动物的丰富度和密度,并描述了沿河流纵向梯度在不同空间尺度上的多样性分配特征。我们假设无脊椎动物的多样性在不同的空间尺度上不是均匀分布,而是集中在较细的水池和河段。这项研究是在巴西半干旱的间歇性流域进行的。采样是分层进行的,包括3条河段(上部,中部和支流),n  = 81)。在河段(β4),河段(β3),地点(β2)和微生境(β1)的尺度上评估了大型无脊椎动物的多样性。生境结构由在空间上变化的各种元素组成。在大型无脊椎动物组合中观察到群落组成的尺度依赖性空间隔离。多样性划分分析强调了更广泛的空间尺度(β4)的重要性以及更精细的空间尺度(β1β2)针对旱地流域研究地点的区域多样性。我们的观察结果反映了组合组成的均质化和较小规模的多样性降低的组合,更广泛的规模对多样性的贡献更大。

更新日期:2020-06-04
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