Seasonally flooded stepping stones: emerging diversity of small mammal assemblage in the Amazonia-Cerrado ecotone, central Brazil

Rocha, Rita Gomes; Ferreira, Eduardo; Martins, Iracy C. M.; Costa, Leonora Pires; Fonseca, Carlos

doi:10.1186/s40555-014-0060-0

Cited by 6 publications

(12 citation statements)

References 48 publications

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“…Species richness, in a similar manner as found across sites and habitats, overlapped across localities. This is the first study to analyze this variable in a standardized way, evidencing rich small mammal assemblages throughout the Cerrado, reinforcing the high richness previously found in independent surveys at different portions of the biome (12-24 species; e.g., Bonvicino et al, 2005Bonvicino et al, , 2012Bonvicino et al, , 2014bCáceres et al, 2007Cáceres et al, , 2011aBezerra et al, 2009;Pereira and Geise, 2009;Carmignotto and Aires, 2011;Rocha R. G. et al, 2011Rocha R. G. et al, , 2014Santos-Filho et al, 2012;Carmignotto et al, 2014;Gomes et al, 2015;Carmignotto, 2019;Ribeiro et al, 2020). Long-term inventories comprising the wet and dry seasons typical of the Cerrado may also yield a higher number of individuals and species, especially considering naturally rare species (e.g., 1-4 individuals across localities), and those that present a great variation in abundance between seasons (Bonvicino et al, 2014b;Gomes et al, 2015;Rocha et al, 2017;Ribeiro et al, 2019).…”

Section: Discussion Species Richness and Diversity Across Scalessupporting

confidence: 69%

Habitat Heterogeneity and Geographic Location as Major Drivers of Cerrado Small Mammal Diversity Across Multiple Spatial Scales

2022

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The Cerrado biome is one of the global hotspots of biodiversity, and non-volant small mammals represent a significant portion of Cerrado species richness (45%) and endemism (86%). Nevertheless, we still lack a comprehensive picture of small mammal diversity patterns and drivers throughout the Cerrado. Here we surveyed small mammals across 45 sites to address species richness, abundance, and composition patterns and their drivers within and across sites, habitats, and localities at the world’s most diverse tropical savanna. As hypothesized, we found: (1) rich assemblages (12–21 species) characterized by few abundant and several intermediate-level and rare species; dominated by oryzomyine and akodontine cricetid rodents, and thylamyine and marmosine within marsupials, each tribe showing distinct habitat requirements; (2) strong habitat selectivity, with assemblages composed of forest dwellers, savanna specialists, and grassland inhabitants; and (3) similar species richness (α-diversity) but high species turnover (β-diversity) across sites, habitats, and localities, suggesting that horizontal stratification (within localities) and geographic location (across the Cerrado) are key drivers of small mammal diversity in tropical savannas. Thus, habitat heterogeneity and geographic location can be inferred as the main factors shaping species richness, abundance, and composition across the analyzed multiple spatial scales. Moreover, we found that geographical distance as well as the distance to neighbor biomes better explained species turnover, indicating landscape history and phylogenetic constraints as the major determinants of Cerrado small mammal diversity, as also evidenced for plants and other animal groups. These data highlight the need to preserve the mosaic of habitats across the different regions of the biome to conserve most of the Cerrado biodiversity.

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Section: Discussion Species Richness and Diversity Across Scalessupporting

confidence: 69%

Habitat Heterogeneity and Geographic Location as Major Drivers of Cerrado Small Mammal Diversity Across Multiple Spatial Scales

2022

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“…On the banks of the tributaries of the Mortes River (Araguaia Basin) 81 species of birds living in forests and cerrado (Sick 1955), 238 species of birds and 57 species of non-flying mammals were recorded in some forests of the Xingu Basin (Oliveira et al 2010). Forests of the Araguaia Basin have been considered as shelters and a food source for several species of small mammals, and the mosaic of habitats generated by the Amazonia–Cerrado contact may determine species diversity in this region (Lacher & Alho 2001; Oliveira et al 2010; Rocha et al 2014). Thus, conservation of the vegetation becomes more urgent and necessary as it will also benefit the rich fauna of this important transitional area (Sick 1955; Lacher & Alho 2001; Rocha et al 2014).…”

Section: Discussionmentioning

confidence: 99%

“…Forests of the Araguaia Basin have been considered as shelters and a food source for several species of small mammals, and the mosaic of habitats generated by the Amazonia–Cerrado contact may determine species diversity in this region (Lacher & Alho 2001; Oliveira et al 2010; Rocha et al 2014). Thus, conservation of the vegetation becomes more urgent and necessary as it will also benefit the rich fauna of this important transitional area (Sick 1955; Lacher & Alho 2001; Rocha et al 2014).…”

Section: Discussionmentioning

confidence: 99%

“…This complex transition zone is hundreds of kilometres wide, with a sinuous total length of more than 6000 km following the complex inter-digitation of Amazonia with the Cerrado domain in the southern Brazilian Amazon Basin (Ratter et al 1973; Ackerly et al 1989; Marimon et al 2014). It has high phytodiversity, with the vegetation mosaic (Ratter et al 2003; Marimon et al 2006; Torello-Raventos et al 2013) also contributing to faunal diversity (Sick 1955; Lacher & Alho 2001; Oliveira et al 2010; Rocha et al 2014).…”

Section: Introductionmentioning

confidence: 99%

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Patterns of tree species composition at watershed-scale in the Amazon ‘arc of deforestation’: implications for conservation

et al. 2016

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SUMMARYThe loss of biodiversity in transitional forests between the Cerrado and Amazonia, the two largest neotropical phytogeographic domains, is an issue of great concern. This extensive region is located within the ‘arc of deforestation’ zone where tropical forests are being lost at the fastest rate on the planet, but floristic diversity and variation among forests here is still poorly understood. We aimed to characterize the floristic composition of forests in this zone and explored the degree and drivers of differentiation within and across Araguaia and Xingu watersheds. In 10 sites we identified all trees with diameter ≥10 cm; these totaled 4944 individuals in 257 species, 107 genera and 52 families. We evaluated the data for multivariate variation using TWINSPAN and DCA to understand the species distribution among sites. There was a larger contribution from the Amazonian flora (169 species) than that of the Cerrado (109) to the transitional forests. Remarkably, 142 species (55%) were restricted to only one sampling site, while 29 species (>16%) are endemic to Brazil, suggesting potentially large loss of species and unique forest communities with the loss and fragmentation of large areas. Our results also suggest that watersheds may be a critical factor driving species distribution among forests in the Amazonian–Cerrado transition zone, and quantifying their role can provide powerful insight into devising better conservation strategies for the remaining forests.

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“…Estas feições funcionam, na planície de inundação, como importantes corredores ecológicos para as espécies endêmicas da área de transição dos biomas Cerrado e Amazônico (ROCHA et al, 2014), faixa considerada como o maior ecótono tropical do mundo (TORELLO-RAVENTOS et al, 2013).…”

Section: Introductionunclassified

Caracterização morfométrica de feições doliniformes na Planície do Araguaia

Manchola

Morais

2023

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A Planície do Araguaia apresenta extensas áreas de savanas com dispersos fragmentos florestais localizados sobre depressões circulares. Estas feições além de servirem como importantes corredores ecológicos, poderiam estar associadas a formações cársticas do tipo dolinas, estruturas fechadas de conexão das águas superficiais e subterrâneas. Para identificar esta relação e contribuir o entendimento da sua gênese, este estudo tem como objetivo principal o mapeamento e análise morfométrica de feições doliniformes na Planície do Araguaia. Por meio da caracterização geoambiental da área de estudo; modelos de elevação digital – SRTM; interpretação de imagens do satélite Sentinel 2-A do período de 2019 a 2020; e cálculo das variáveis morfométricas: área, perímetro, declividade, altitude, coeficiente de alongamento, índice de circularidade e densidade de Kernel. Foram identificadas 24.023 feições doliniformes associadas à vegetação verde/sadia em área de abrangência de 114.900 km², concentradas majoritariamente nos municípios de Lagoa da Confusão – TO, Pium – TO e Cocalinho – MT. As feições apresentaram áreas de até 10 km², índices de circularidade superiores a 0,5 e coeficientes de alongamento entre 1 e 1,5, indicando uma predominância de formas circulares em declividades de até 3% na orientação NE. Com base nos resultados, pode-se inferir que estas feições apresentam formas de dolinas, as quais podem estar sob influência de controles estruturais e associadas a processos cársticos, denotando em alguns lugares a existência de um carste encoberto.

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Seasonally flooded stepping stones: emerging diversity of small mammal assemblage in the Amazonia-Cerrado ecotone, central Brazil

Cited by 6 publications

References 48 publications

Habitat Heterogeneity and Geographic Location as Major Drivers of Cerrado Small Mammal Diversity Across Multiple Spatial Scales

Habitat Heterogeneity and Geographic Location as Major Drivers of Cerrado Small Mammal Diversity Across Multiple Spatial Scales

Patterns of tree species composition at watershed-scale in the Amazon ‘arc of deforestation’: implications for conservation

Caracterização morfométrica de feições doliniformes na Planície do Araguaia

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