&lt;b&gt;Partitioning beta diversity of aquatic Oligochaeta in different environments of a Neotropical floodplain

Danielle Katharine Petsch,Luís Gabriel Antão Barboza,Flávio Henrique Ragonha,Bárbara Carolina Garcia Gimenez,Alice Michiyo Takeda

doi:10.4025/actascibiolsci.v37i1.21738

<b>Partitioning beta diversity of aquatic Oligochaeta in different environments of a Neotropical floodplain

Danielle Katharine Petsch, Luís Gabriel Antão Barboza + Show 3 more

Open Access

https://doi.org/10.4025/actascibiolsci.v37i1.21738

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Abstract

We tested the hypothesis that the contribution of the nestedness component is higher in environments with more similar features (lentic or lotic), whereas the contribution of the turnover component is higher in environments with more dissimilar features (lotic vs. lentic). To this end, we partitioned beta diversity of the Oligochaeta community into 12 environments of the Upper Parana River floodplain. We recorded 986 individuals of 17 taxa. Through Redundancy Analysis, we observed a differentiation between lentic and lotic habitats both by environmental features as species composition. Our hypothesis was partially supported, because in environments with more similar hydrological characteristics, we observed a greater contribution of the nestedness component only in lentic environments, whereas in lotic environments, the turnover component showed a higher value. Moreover, when analyzed the different environments (lentic vs. lotic), we noticed a very similar contribution of both components. Some species were more frequent, as A. pigueti and P. americana, while others were exclusive to some environments (N. bonettoi and H. aedeochaeta). We evidenced the importance of each component in structuring Oligochaeta community, nonetheless, in a different way between environments with more similar (nestedness to lentic and turnover to lotic) or dissimilar (almost the same contribution of both) features.

Highlights

Partição da diversidade beta de Oligochaeta aquático em diferentes ambientes de uma planície de inundação neotropical
We developed this study in the Upper Paraná River floodplain, in 12 different environments inserted in the Long Term Ecological Research (LTER) site 6 (Figure 1)
Species ordered on the top of the matrix, such as A. pigueti, Pristina americana, Pristina orborni, Nais communis and Bratislavia unidentata, were the most frequent species, occurring in many environments

Summary

Introduction

Partição da diversidade beta de Oligochaeta aquático em diferentes ambientes de uma planície de inundação neotropical. Nossa hipótese foi parcialmente corroborada uma vez que em relação aos ambientes com características mais similares, observamos maior contribuição do componente aninhamento apenas nos ambientes lênticos, enquanto nos ambientes lóticos, o componente turnover foi maior. Nós evidenciamos a importância de cada componente na estruturação da comunidade de Oligochaeta, no entanto, de uma forma diferente entre os ambientes com características mais semelhantes (aninhamento para lênticos e turnover para lóticos) ou diferentes (contribuição semelhante de ambos). Beta diversity may reflect two different phenomena: nestedness and spatial turnover (HARRISON et al, 1992; BASELGA, 2010). Spatial turnover implies the replacement of some species by others as a consequence of environmental sorting or spatial and historical constraints (QIAN et al, 2005). In this way, according to Baselga (2010), all situations where communities are not identical can be described by only these two main patterns (turnover and nestedness) or combinations of both, since the only processes required to generate all the possible patterns are species replacement and loss or gain of species

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