Bionomic differences in odonates and their influence on the efficiency of indicator species of environmental quality

Dutra, Silvia Leitão; Marco, Paulo De

doi:10.1016/j.ecolind.2014.09.016

Cited by 57 publications

(39 citation statements)

References 53 publications

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“…These modifications in the streams channels increased the amount of backwaters along the channels and increased the incidence of sunlight. These two factors are used by many exophytic species to choose the location for oviposition, allowing exophytic species richness to increase in places with little or no forest cover around streams (Wildermuth, ; Corbet, ; Worthen & Patrick, ; Stoks & Córdoba‐Aguilar, ; Dutra & De Marco, ). Miathyria marcella , Orthemis discolor, and Pantala flavencens are species in our study that oviposit in ponds, lakes or slow moving waters (Corbet, ; Garrison et al ., ; Van de Koken et al ., ).…”

Section: Discussionmentioning

confidence: 99%

Egg‐laying traits reflect shifts in dragonfly assemblages in response to different amount of tropical forest cover

Rodrigues

Roque

Ferreira

et al. 2018

Insect Conserv Diversity

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Oviposition site selection by aquatic insects is usually influenced by both aquatic and terrestrial cues. Landscape changes (e.g. native vegetation loss) can affect the level of the reproductive success in aquatic insects, changing local species composition and richness. We investigate whether forest cover loss around streams influences the number of species with exophytic (species which lay eggs directly on the water surface), endophytic (species which lay their eggs directly into plant tissue), or epiphytic (species which lay eggs on the exposed surface of rocks, leaves, trunks or other substrates protruding from the stream surface) oviposition behaviour in dragonfly assemblages. We sampled adult dragonflies in 116 streams in a Neotropical savanna region in Brazil. The relationship between species richness for each behavioural category, and the proportion of forest cover around the streams, was tested using regression analysis. We collected 2413 dragonfly (Anisoptera and Zygoptera) individuals, belonging to 8 families, 30 genera, and 63 species. Of these, 25 species were classified as exophytic, 28 as epiphytic, and 10 as endophytic. Our results show that the number of species with exophytic or epiphytic behaviour was strongly related to riparian forest loss. Forest loss changes the habitat, and here, specifically changes site suitability for oviposition. We highlight the importance of using behavioural traits as a bioindicator tool for the assessment of anthropogenic impacts on tropical forest.

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Section: Discussionmentioning

confidence: 99%

Egg‐laying traits reflect shifts in dragonfly assemblages in response to different amount of tropical forest cover

Rodrigues

Roque

Ferreira

et al. 2018

Insect Conserv Diversity

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Section: Discussionmentioning

confidence: 99%

“…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%

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%

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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Bionomic differences in odonates and their influence on the efficiency of indicator species of environmental quality

Cited by 57 publications

References 53 publications

Egg‐laying traits reflect shifts in dragonfly assemblages in response to different amount of tropical forest cover

Egg‐laying traits reflect shifts in dragonfly assemblages in response to different amount of tropical forest cover

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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