Dragonfly endemism in the Brazilian Amazon: competing hypotheses for biogeographical patterns

Juen, Leandro; Marco, Paulo De

doi:10.1007/s10531-012-0377-0

Cited by 66 publications

(73 citation statements)

References 31 publications

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“…This is congruent to our initial expectations, and shows that rivers act as barriers to the dispersal of one suborder but not the other. The Guiana interfluve showed the most particular species composition for Zygoptera, congruent with the highest level of endemism of this interfluve found by Juen and De Marco () for this group and by Oliveira et al . () for birds.…”

Section: Discussionsupporting

confidence: 86%

“…; in Supporting Information). Detailed information about the sampling protocol can be found at Juen and De Marco () and Brasil et al . ().…”

Section: Methodsmentioning

confidence: 99%

“…The large Amazonian rivers appear to limit the distribution of damselflies – suborder Zygoptera – resulting in interfluves with particular species composition and a lower proportion of shared species among different interfluves. By contrast, the large Amazonian rivers do not seem to constrain the distribution of dragonflies – suborder Anisoptera (Juen & De Marco, ). These differences in distribution patterns can directly influence the relationship between local and regional species richness of the two suborders, since wider spatial distribution ranges allow species to occur in more assemblages in a region.…”

Section: Introductionmentioning

confidence: 99%

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Drivers of regional and local diversity of Amazonian stream Odonata

Alves‐Martins

Calatayud

Medina

et al. 2018

Insect Conserv Diversity

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Large Amazonian rivers may act as dispersal barriers for animals with low dispersal abilities, limiting their distribution to certain interfluves. Consequently, the distribution of these taxa would be less affected by macroclimatic gradients. Conversely, high‐dispersal taxa would be less constrained by large rivers and may track suitable climates. We evaluate whether Zygoptera and Anisoptera, two Odonata suborders with different dispersal abilities, show differences in distribution patterns across Amazonian interfluves. We further assess the relative importance of macroclimatic and habitat factors in their community assembly. We used network modularity analyses to identify biogeographic species pools and spatial buffers to define metacommunity species pools. Then, we used structural equation models to estimate the relative importance of multi‐scale factors on species richness patterns. Zygoptera communities are more similar in species composition within than between interfluves, suggesting that large Amazonian rivers indeed limit the distribution of Zygoptera species. Conversely, the distribution of Anisoptera extends across Amazonian interfluves. Seasonality has a strong positive effect on Zygoptera and Anisoptera richness across scales. In addition, habitat integrity is negatively correlated with the regional species richness and abundance of Anisoptera and positively correlated with Zygoptera local richness. The contrasting effects of habitat integrity on Anisoptera and Zygoptera suggest that the former is favored in open habitats, whereas the latter is so in forests. Despite these differences, both suborders appear to follow similar community assembly mechanisms in Amazonia, with a strong climatic control across scales and an effect of habitat filters on local communities.

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Section: Discussionsupporting

confidence: 86%

“…; in Supporting Information). Detailed information about the sampling protocol can be found at Juen and De Marco () and Brasil et al . ().…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Drivers of regional and local diversity of Amazonian stream Odonata

Alves‐Martins

Calatayud

Medina

et al. 2018

Insect Conserv Diversity

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“…We collected adult damselflies (Odonata: Zygoptera) in 93 small streams (no more than 5 m in width and 0.8 m in mean depth), located in eastern Brazilian Amazonia, in the municipalities of Santarém and Belterra in the Tapajós area of endemism (interfluvium between the Tapajós and Xingu Rivers), and the municipality of Paragominas, in the Belém area of endemism (interfluvium between the Tocantins and Amazon Rivers), all in the state of Pará, Brazil (Figure ). Given the possible influence of isolation by rivers (Wallace ), which has been confirmed in Amazonian zygopteran communities (Juen and de Marco, ), we considered the Paragominas (located in the Belém area of endemism), and Santarém and Belterra (Tapajós area of endemism) regions, as two distinct biogeographic units in our analyses.…”

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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“…Despite the lack of a thorough account of its regional biodiversity, Juen and De Marco (2012) were able to demonstrate higher levels of odonate endemism in interfluvial areas, mostly because of a large number of species with small ranges. As Strayer and Dudgeon (2010, p. 346) pointed out, "the insular nature of freshwater habitats has led to the evolution of many species with small geographic ranges, often encompassing just a single lake or drainage basin."…”

mentioning

confidence: 98%