Avian Biogeography of Amazonian Flooded Forests in the Rio Branco Basin, Brazil

Naka, Luciano N.; Cohn‐Haft, Mario; Whittaker, Andrew S.; Barnett, Juan Mazar; Torres, Marcela De Fátima

doi:10.1676/06-062.1

Cited by 19 publications

(27 citation statements)

References 13 publications

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“…This does not mean that studying taxa restricted to habitats other than terra firme forest cannot provide important clues about the evolutionary history of life on Earth, but only that studies should not combine datasets from different habitats assuming that their histories should be congruent because they occur in the same interfluvium. Furthermore, patterns of endemism in other habitats may prove fruitful avenues of research, broadening our understanding of the evolutionary processes that shaped current biotas and revealing novel patterns (Naka et al. , 2007; Cohn‐Haft et al.…”

Section: Discussionmentioning

confidence: 99%

“…, 2007)), it possesses several features that may enhance its effect as a biogeographical barrier. First, like other Amazonian rivers, the Rio Branco has relatively large floodplains which also act as dispersal barriers to terra firme forest species (Remsen & Parker, 1983; Naka et al. , 2007).…”

Section: Discussionmentioning

confidence: 99%

“…prove fruitful avenues of research, broadening our understanding of the evolutionary processes that shaped current biotas and revealing novel patterns (Naka et al, 2007;Cohn-Haft et al, 2008). The reason why I identified more endemic taxa than previous studies is probably due to a more careful analysis of subspecies distributions.…”

Section: Identifying Endemic Taxamentioning

confidence: 99%

“…Although the Rio Branco is relatively small by Amazonian standards (it ranks 18th among the 20 longest Amazonian rivers (Goulding et al, 2003) and 12th in discharge volume (Ferreira et al, 2007)), it possesses several features that may enhance its effect as a biogeographical barrier. First, like other Amazonian rivers, the Rio Branco has relatively large floodplains which also act as dispersal barriers to terra firme forest species (Remsen & Parker, 1983;Naka et al, 2007). Second, the Rio Branco lies in an ecologically heterogeneous region (Hammond, 2005), a characteristic that may directly affect avian distribution patterns by diminishing opportunities for dispersal.…”

Section: The Role Of Physical Barriers and The Boundaries Of The Guiamentioning

confidence: 99%

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Avian distribution patterns in the Guiana Shield: implications for the delimitation of Amazonian areas of endemism

Naka¹

2010

Journal of Biogeography

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Aim To develop a methodology for defining the boundaries of the Guianan area of endemism using complementary approaches that include GIS tools, multivariate statistics and analyses of physical barriers in the distribution patterns of an entire endemic avifauna. As a case study, I used the distribution patterns of lowland terra firme forest birds.Location Guiana Shield, northern South America.Methods I identified Guianan endemics using the ornithological literature, subsequently gathering distributional data for these taxa using mainly museum collections and my own fieldwork in the region. I used these distributional data to map the spatial patterns of endemicity in the region and to compare distributions across taxa. I employed community composition data from 34 localities from throughout the Guiana Shield to identify spatial patterns of clustering using an ordination analysis (non-metric multidimensional scaling), and to recognize the region's main biogeographical barriers for birds using Monmonier's algorithm.Results At least 88 avian taxa are restricted to the terra firme forests of the Guianan area of endemism, which is roughly delimited by the Amazon, Negro and Branco rivers. These large rivers, however, are not the only boundaries. I identified seven additional barriers, including medium-sized rivers, non-forested areas and mountains, which also contribute to delimiting the area of endemism. Within the endemic avifauna, I identified three distinct distribution patterns. The ordination analysis shows the presence of two distinct avifaunas within the Guiana Shield.Main conclusions Although the proposed boundaries of the Guianan area of endemism are consistent with previously postulated configurations, this study reveals a more complex delimitation than formerly recognized, highlighting the importance of several landscape features besides large rivers, and the existence of three distinct distributional patterns within one endemic avifauna. The Branco/ Negro interfluvium, often included within this area of endemism, actually represents a transition zone between two distinct avifaunas. The longstanding view of the Amazon Basin as a mosaic of parapatric areas of endemism delimited by major rivers appears to be an oversimplification, at least for the Guiana Shield. This finding suggests the need for more rigorous approaches to re-evaluate the traditional boundaries of such areas.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Identifying Endemic Taxamentioning

confidence: 99%

Section: The Role Of Physical Barriers and The Boundaries Of The Guiamentioning

confidence: 99%

See 2 more Smart Citations

Avian distribution patterns in the Guiana Shield: implications for the delimitation of Amazonian areas of endemism

Naka¹

2010

Journal of Biogeography

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“…This country, like no other, offered Juan a mixture of dry habitats, luxuriant forests, and many threatened and range-restricted species that he learned to identify with a swift and impressive authority. In Brazil, he worked in most biomes, including the Atlantic Forest, the Cerrado, the Caatinga, the Pantanal, and Amazonia, publishing many articles with a productive network of collaborators, most of whom were close personal friends (Mazar Barnett 2000b, 2007, Kirwan et al 2001a, b, 2004, Raposo et al 2002, 2004b, Whitney et al 2003, Stouffer et al 2011). More recently, Juan joined the advisory committee of the Wildlife Conservation Society's "Birds of Brazil" series of field guides (Gwynne et al 2010).…”

mentioning

confidence: 99%