Does the damming of streams in the southern Amazon basin affect dragonfly and damselfly assemblages (Odonata: Insecta)? A preliminary study

Brasil, Leandro Schlemmer; Giehl, Núbia França da Silva; Almeida, Sara Miranda; Valadão, Marco Bruno Xavier; Santos, Josias Oliveira dos; Pinto, Nelson Silva; Batista, Joana Darc

doi:10.1080/13887890.2014.963712

Cited by 19 publications

(15 citation statements)

References 40 publications

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“…Assessing biodiversity is one of the greatest challenges for scientists, especially in regions of high variation, such as the Tropical region [ 36 ]. The methodology applied in the present study proved to be efficient, and the richness assessed was similar to what was found in studies at the regional and local scale [ 6 , 17 , 30 , 42 , 43 ]. We observed variation in species richness patterns, especially regarding sampling time, evidencing noon was the best time to sample dragonflies.…”

Section: Discussionsupporting

confidence: 76%

Sampling efficiency of a protocol to measure Odonata diversity in tropical streams

et al. 2021

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Odonata can be sampled following different types of protocols. In Brazil, the most used protocol is the scanning in fixed areas method, where a 100-meter transect is delimited in one of the stream margins, subdivided into 20 segments measuring 5 meters. Despite being universally used, the methodological efficiency or limitations of this protocol for Odonata has never been tested. In this scenario, our objective was to assess the efficiency of the sampling protocol to measure the richness and composition of Odonata in three fundamental aspects: the time of sampling and sampling effort over time and space. We show that the best sampling efficiency was achieved in collections performed at noon, in transects measuring 100 meters, requiring at least two samplings in the same location, supporting the procedures traditionally adopted by many studies with the group. While comparing species composition, we did not see any implication between the different treatments on the capture of the local species pool. However, we highlight and discuss some possible methodological flaws when using this protocol to sample specific Odonata groups. We believe the results obtained are fundamental in the inventory of species and to conduct future studies, as well as to aid conservative measures that use the order Odonata as a tool for environmental monitoring.

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Section: Discussionsupporting

confidence: 76%

Sampling efficiency of a protocol to measure Odonata diversity in tropical streams

et al. 2021

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“…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%

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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“…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%

“…In each stream, we demarcated a linear transect of 100 m, and captured all the adult Zygoptera specimens observed along the transect, with a mean sampling period of 1 h, using an entomological hand-net of 40 cm in diameter and 65 cm in length. To minimise bias related to the different types of thermoregulation (thermal conformers, heliotherms and endotherms: May, 1976), we collected specimens only on sunny days between 10:00 a.m. and 2:00 p.m., when the sun's rays reach the principal channel of the streams Brasil et al, 2014b;Miguel et al, 2017a).…”

Section: Biotic Variablesmentioning

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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Does the damming of streams in the southern Amazon basin affect dragonfly and damselfly assemblages (Odonata: Insecta)? A preliminary study

Cited by 19 publications

References 40 publications

Sampling efficiency of a protocol to measure Odonata diversity in tropical streams

Sampling efficiency of a protocol to measure Odonata diversity in tropical streams

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

Spatial, biogeographic and environmental predictors of diversity in Amazonian Zygoptera

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