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Cladocera Distribution Along an Environmental Gradient on The Short Research Note Acta Limnologica Brasiliensia, 2019, vol. 31, e29 https://doi.org/10.1590/S2179-975X2919 ISSN 2179-975X on-line version Cladocera distribution along an environmental gradient on the Cerrado-Amazon ecotone: a preliminary study Distribuição de Cladocera ao longo de um gradiente ambiental no ecótono Cerrado-Amazônia: um estudo preliminar Leandro Schlemmer Brasil1* , Ana Luiza-Andrade1 , Tiago Borges Kisaka2 , Paulo Ilha3 and Francisco Diogo Rocha Sousa4 1 Programa de Pós-graduação em Zoologia, Universidade Federal do Pará – UFPA, R. Augusto Corrêa, 1, Bairro Guamá, CEP 66075-110, Belém, PA, Brasil 2 Departamento de Ecologia, Universidade de Brasília – UnB, Campus Universitário Darcy Ribeiro, Bloco E, s/n, 1º andar, Asa Norte, CEP 70919-900, Brasília, DF, Brasil 3 Instituto de Pesquisa Ambiental da Amazônia – IPAM, R. Horizontina, 104, Centro, CEP 78640-000, Canarana, MT, Brasil 4 Unidade Acadêmica Especial de Ciências Biológicas, Universidade Federal de Jataí – UFJ, BR 364, Km 195, 3800, CEP 75801-615, Jataí, GO, Brasil *e-mail: [email protected] Cite as: Brasil, L.S et al. Cladocera distribution along an environmental gradient on the Cerrado- Amazon ecotone: a preliminary study. Acta Limnologica Brasiliensia, 2019, vol. 31, e29 Abstract: Aim: Our objective in this study is to understand Cladocera species distribution along an environmental gradient in forest and cropland landscapes in the southern Amazon. Methods: We collected Cladocera communities and environmental variables from five streams and verified their associations with a Redundancy Analysis.Results: Acroperus tupinamba, Alonella dadayi e Kisakiellus aweti were mostly associated to sites with higher canopy cover. Anthalona neotropica, Anthalona verrucose and Flavalona iheringula occurred exclusively in site with more thalweg depth. Conclusions: If these results are confirmed Cladocera stream communities are affected by changes in land use. Further studies in this line are extremely necessary to reduce this knowledge gap. Keywords: change in-stream; land use change; arc of deforestation. Resumo: Objetivo: Nosso objetivo neste estudo é entender a distribuição de espécies de Cladocera ao longo de um gradiente ambiental em florestas e paisagens agrícolas no sul da Amazônia. Métodos: Coletamos comunidades de Cladocera e variáveis ambientais em cinco riachos e verificamos suas associações com uma Análise de Redundância. Resultados: Acroperus tupinamba, Alonella dadayi e Kisakiellus aweti foram mais associados a locais com maior cobertura do dossel. Já Anthalona neotropica, Anthalona verrucose e Flavalona iheringula ocorreram exclusivamente no local com maior profundidade de talvegue. Conclusões: Se estes resultados forem confirmados, as comunidades de Cladocera de riachos são afetadas por mudanças no uso da terra. Mais estudos nessa linha são extremamente necessários para reduzir essa lacuna de conhecimento. Palavras-chave: mudanças no riacho; mudanças no uso da terra; arco do desmatamento. This is an Open Access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. 2 Brasil, L.S. et al. 1. Introduction 2. Material and Methods Agriculture expansion is responsible for The sampling took place in August 2017. high rates of deforestation at the “Arch of We sampled five streams that belong to the Deforestation” region, an extensive area in the high Xingu River Basin, located within the Cerrado-Amazon ecotone which is currently Cerrado-Amazon ecotone in the county of undergoing strong land conversion and frontier Querência, Mato Grosso (Brazil). This region settlement (Brando et al., 2013). The conversion is characterized by rapid agriculture expansion, of natural landscapes in cropland systems causes being inserted within the “Arch of Deforestation” steep environmental changes and is the main (Figure 1). Three streams (“APP2”, “APP2A” and responsible for the deterioration of the freshwater “APPM”) are located in micro-basins with a high ecosystems (Leal et al., 2018). Such disturbances degree of conservation, composed mainly of primary might disrupt biotic communities such as fish forests, and two (“TAN1” and “APP CASCAVEL”) and aquatic invertebrates (Montag et al., 2019). in micro-basins dominated by croplands. In this sense, it is of major importance to have This region was deforested in the 1970s and knowledge about the identity of the species, what underwent a first cycle of logging, being secondarily is their distribution and how they interact with the converted to cattle pasture and finally being environmental conditions (Hortal et al., 2015). gradually converted to agriculture in the (soybean Microcrustaceans of the Superorder Cladocera planting in the main crop and corn and millet in are important in the food web of freshwater the secondary crop) 1990s (Brando et al., 2013). ecosystems because of their trophic features Changes in fish (Ilha et al., 2018, 2019) and (Santos et al., 2010) as the majority of species are Odonata (Brasil et al., 2014a, b) communities have filters, scrapers or collectors of organic matter. already been documented in this region and related At the same time, they are part of the diet of to environmental changes caused by the conversion other invertebrates, fishes and aquatic birds of the forest into agrosystems. (Elmoor-Loureiro & Soares, 2010). Shortfalls In each stream, biological sampling was conducted in Cladocera are mostly related to small lotic in a transect of 30 m using a plankton net (100 μm systems, a type of ecosystem that does not receive mesh) dragged throughout leaves, tree branches, fine a lot of research focus when compared to lentic sediments and macrophytes. The material gathered ecosystems, due to the unfavourable conditions for was set in ethanol (70%) and identified to species the establishment of large populations (Sousa & level (Sousa & Elmoor-Loureiro, 2018). Along the Elmoor-Loureiro, 2013). For the southern Amazon transect we measured ten environmental variables: region, there is only a precursory species list (Sousa Canopy cover (%), Average channel depth (cm), & Elmoor-Loureiro, 2018), with no information Average thalweg depth (cm), Average channel width about the relation of those species with the (m), Width/Depth, Sinuosity, Fine Benthic Organic different environmental conditions. A reason for Matter (%), Coarse Benthic Organic Mattter (%), this lotic shortfall for Cladocera is that most studies Roots (%) and Wood (%). All environmental for the group are restricted to lentic ecosystems variables were measured at least three times per (Ghidini & Santos-Silva, 2011). Nevertheless, transect, at the beginning, middle and in the end. there is a high relevance in the increase of this More details on the collection of environmental knowledge as the relationship between Cladocera variables can be seen at Montag et al. (2019). and local conditions has recently been explored As we only had five sites (samples) we reduced for the Neotropical region, with results reinforcing the number of predictor variables. When the the importance of temperature and precipitation number of descriptor variables is greater than for the productivity of freshwater ecosystems the number of samples, it is very difficult to (Rocha et al., 2017). capture reliable patterns in multivariate analyzes Given the knowledge shortfall about Cladocera (Legendre & Legendre, 2012). Therefore, we used communities and the rapid conversion from a bioenv variable selection method to select the natural landscapes to cropland systems in the three most important predictors for Cladocera Cerrado-Amazon ecotone, our objective is to communities using the Vegan package bioenv understand the relation between the distribution function (Oksanen et al., 2010). of Cladocera species along an environmental To verify the relationship of Cladocera species gradient within landscapes of both cropland and with the environmental gradient we used the forest systems. matrix of species with the hellinger transformation Acta Limnologica Brasiliensia, 2019, vol. 31, e29 Cladocera distribution along an environmental… 3 Figure 1. Study area and sampling sites from the Upper Xingu River Basin, satellite image based on Normalized Difference Vegetation Index (NDVI) - composition False Color -bands 5/4/3 – Spacial resolution of 30 meters, LANDSAT 8 (2017). and the standardized environmental matrix in a two sites, one cropland and one forest. This species Redundancy analysis (RDA) (Legendre & Legendre, was recently reported in streams and is endemic 2012) and tested the significance with ANOVA from the southern Amazon region (Sousa & (Legendre & Legendre, 2012). Elmoor-Loureiro, 2018). Based on the ten measured environmental 3. Results and Discussion variables (Table 2) the most important for We sampled 22 individuals that were allocated Cladocera communities and used as predictors to eight taxa, seven species and one morphospecies in the RDA were canopy cover, average channel (Table 1). The number of individuals by site was depth and width/depth. Together they had a 63% of 4.4±2.07 (average ± standard deviation) and of correlation in BIOENV (Table 3). Changes in taxa (richness) was of 2.8±1.30. The species with land use often cause changes in within-stream the higher abundance were Acroperus tupinambá environmental conditions (Montag et al., 2019). In (Elmoor-Loureiro, 1997) with six individuals the Amazon,
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