Environmental integrity and damselfly species composition in Amazonian streams at the "arc of deforestation" region, Mato Grosso, Brazil

Brasil, Leandro Schlemmer; Batista, Joana Darc; Giehl, Núbia França da Silva; Valadão, Marco Bruno Xavier; Santos, Josias Oliveira dos; Dias-Silva, Karina

doi:10.1590/s2179-975x2014000300007

Cited by 24 publications

(20 citation statements)

References 49 publications

(61 reference statements)

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“…Initially, to define the threshold of habitat integrity along the environmental gradient that divided the sites into two categories (negligibly impacted and impacted), we performed a principal component analysis (PCA) using the 12 environmental variables that make up the HII (Supplementary material 1). Based on this analysis and the findings of previous studies (Brasil, Batista, et al., ; Dutra & De Marco, ; Juen et al., ; Monteiro‐Júnior et al., ; Oliveira‐Junior et al., ), we defined a threshold of HII = 0.7 to separate the negligibly impacted streams (HII ≥ 0.7) from the impacted (HII < 0.7) streams. While the term “negligibly impacted” is used here to facilitate the comprehension of the results, some of the sites may have suffered a certain degree of anthropogenic impact, but can be considered to be the best conserved sites, given the local context of the region, and adequate for inclusion in the analyses as control sites.…”

Section: Methodsmentioning

confidence: 96%

“…The HII has proven to be a valuable descriptor of the environmental integrity of Amazonian streams, and when applied to odonate fauna, it has also been shown to be a good predictor of the abundance of individuals and the species richness and composition of these communities (Brasil, Batista, et al., ; Brasil, Giehl, et al., ; Carvalho, Pinto, Oliveira‐Júnior, & Juen, ; Juen, Oliveira‐junior, & Shimano, ; Monteiro‐Júnior, Couceiro, Hamada, & Juen, ; Monteiro‐Júnior et al., ; Oliveira‐Junior et al., ). Major alterations, principally in species composition, tend to be observed at streams with integrity values of <0.6 or 0.7.…”

Section: Methodsmentioning

confidence: 99%

“…Major alterations, principally in species composition, tend to be observed at streams with integrity values of <0.6 or 0.7. Significant changes tend to be observed in the communities found in habitats with indices lower than this (Brasil, Batista, et al., ; Carvalho et al., ; Juen et al., ; Monteiro‐Júnior et al., ; Oliveira‐Junior et al., ).…”

Section: Methodsmentioning

confidence: 99%

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Elements of metacommunity structure in Amazonian Zygoptera among streams under different spatial scales and environmental conditions

Brasil

Vieira

Oliveira

et al. 2017

Ecology and Evolution

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An important aspect of conservation is to understand the founding elements and characteristics of metacommunities in natural environments, and the consequences of anthropogenic disturbance on these patterns. In natural Amazonian environments, the interfluves of the major rivers play an important role in the formation of areas of endemism through the historical isolation of species and the speciation process. We evaluated elements of metacommunity structure for Zygoptera (Insecta: Odonata) sampled in 93 Amazonian streams distributed in two distinct biogeographic regions (areas of endemism). Of sampled streams, 43 were considered to have experienced negligible anthropogenic impacts, and 50 were considered impacted by anthropogenic activities. Our hypothesis was that preserved (“negligible impact”) streams would present a Clementsian pattern, forming clusters of distinct species, reflecting the biogeographic pattern of the two regions, and that anthropogenic streams would present random patterns of metacommunity, due to the loss of more sensitive species and dominance of more tolerant species, which have higher dispersal ability and environmental tolerance. In negligible impact streams, the Clementsian pattern reflected a strong biogeographic pattern, which we discuss considering the areas of endemism of Amazonian rivers. As for communities in human‐impacted streams, a biotic homogenization was evident, in which rare species were suppressed and the most common species had become hyper‐dominant. Understanding the mechanisms that trigger changes in metacommunities is an important issue for conservation, because they can help create mitigation measures for the impacts of anthropogenic activities on biological communities, and so should be expanded to studies using other taxonomic groups in both tropical and temperate systems, and, wherever possible, at multiple spatial scales.

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Section: Methodsmentioning

confidence: 96%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Elements of metacommunity structure in Amazonian Zygoptera among streams under different spatial scales and environmental conditions

Brasil

Vieira

Oliveira

et al. 2017

Ecology and Evolution

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“…In the Amazon, the state of Pará is notable for its strategic location when considering the advance of the Deforestation Arc. It is one of the most deforested regions in Brazil, due to the great changes in the natural landscapes resulting from agricultural expansion (BRASIL et al, 2014), and also because of its contribution to Agrarian Reform land distribution, whose settlements total 1,055 units and 221,804 families installed by 2013, the largest area of settlement projects among the Amazonian states.…”

Section: Introductionmentioning

confidence: 99%

Impact of Rural Settlements on the Deforestation of the Amazon

Farias

Beltrão

Santos

et al. 2018

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In recent years, it is possible to realize a change in the profile of deforestation in the Amazon, reflecting increasing rates of "little deforestations", result from the diversification of productive activities related to family farming. In the Amazon, the state of Pará stands out for its strategic location when considering the Arc of Deforestation in advance, and also for its contribution in the distribution of lands by the Agrarian Reform, whose settlements add 1.055 units and 221.04 families installed. In this context, this paper aims to investigate the influence of the settlement projects of agrarian reform have on deforestation in the city of Novo Repartimento (PA) from 2000 to 2013.

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“…Our results indicate that turnover is the most important component of the variation in beta diversity in the Zygoptera communities of Amazonian streams, confirming the predictions of our first hypothesis. Local (alpha) species richness was relatively low in comparison with previous studies using similar sampling effort in streams of the Brazilian Atlantic Forest (Silva et al ., ), Cerrado Savanna (Júnior et al ., ; Carvalho et al ., ; Dutra & De Marco, ) and the Amazon‐Cerrado transition zone (Brasil et al ., ,; Juen et al ., ). The Amazon region, however, has one of the highest levels of alpha diversity found anywhere on the planet in a number of different taxonomic groups (Vinet & Zhedanov, ), including the Odonata (Kalkman et al ., ), which may be related to the large number of endemic species found in the different biogeographic regions (Juen & De Marco, ).…”

Section: Discussionmentioning

confidence: 99%

Spatial, biogeographic and environmental predictors of diversity in Amazonian Zygoptera

Brasil

Oliveira

Calvão

et al. 2017

Insect Conserv Diversity

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Our objectives were to assess how turnover and nestedness contribute to beta‐diversity patterns of the Zygoptera in Amazonian streams, and to relate these components of beta diversity to environmental, spatial and biogeographic predictors. Our first hypothesis is that the turnover is the most important component of beta‐diversity patterns due to the historical isolation of all or part of the areas located in the interfluves of the major Amazonian rivers. Our second hypothesis is that the interaction between environmental conditions and the area of endemism (biogeography) would be the most important predictor of beta‐diversity patterns. To test these hypotheses, we compiled data on the Zygoptera communities from 172 Amazonian streams. We used three sets of predictor variables: (i) environmental variables, (ii) area of endemism (biogeographic) and (iii) spatial filters. The turnover explained 99.36% of the beta diversity, corroborating our first hypothesis. Together, environmental and biogeographic variables were the best predictors of beta‐diversity patterns. For turnover, however, the biogeographic variables were the best predictors, contrary to our second hypothesis. We found high gamma diversity, but low alpha diversity in the Zygoptera communities. This paradox is explained by the high turnover among sites within the study landscape. This pattern of diversity is related to both historical biogeographic factors and the spatial structuring of environmental conditions in the Amazon region. In the light of our results (high turnover and beta diversity), and their correspondence with areas of endemism, adequate conservation of Amazonian Zygoptera diversity will depend on the establishment of so‐called mega‐reserves throughout the major Amazonian interfluves and, whenever possible, in the areas with adequate environmental conditions for the greatest possible number of species, otherwise, most species may be at a constant risk of extinction.

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Environmental integrity and damselfly species composition in Amazonian streams at the "arc of deforestation" region, Mato Grosso, Brazil

Cited by 24 publications

References 49 publications

Elements of metacommunity structure in Amazonian Zygoptera among streams under different spatial scales and environmental conditions

Elements of metacommunity structure in Amazonian Zygoptera among streams under different spatial scales and environmental conditions

Impact of Rural Settlements on the Deforestation of the Amazon

Spatial, biogeographic and environmental predictors of diversity in Amazonian Zygoptera

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