Deslocamento Na Matriz Para Espécies Da Mata Atlântica E a Dificuldade Da Construção De Perfis Ecológicos

Crouzeilles, Renato; Lorini, Maria Lúcia; Grelle, Carlos Eduardo Viveiros

doi:10.4257/oeco.2010.1404.06

Cited by 27 publications

(29 citation statements)

References 97 publications

(174 reference statements)

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“…We adopted a "dispersal range" of 400 m, meaning that two fragments separated by less than 400 m were considered as functionally connected. Even though our assumed dispersal range is larger than the observed dispersal ranges (<100 m) recorded for forest-dependent understory birds in the Serra do Mar sub-region (Awade & Metzger 2008), other studies in the Atlantic Forest suggest dispersal ranges very similar or larger than the value adopted here (Crouzeilles et al 2010). Assuming a much larger dispersal range would result in very few (or even a single) functionally connected components in the landscape, indicating that landscape structure would not limit the flow of organisms in the landscape.…”

Section: Methodscontrasting

confidence: 42%

Anchor Areas to Improve Conservation and Increase Connectivity within the Brazilian Mesopotamia of Biodiversity

Holvorcem¹,

Tambosi²,

Ribeiro³

et al. 2011

Nat. Conserv.

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We propose a new methodology based on graph theory for selecting high priority "anchor areas" to which conservation and restoration activities could be "attached", in order to maximize the impact of the available resources on biodiversity conservation and on increasing the landscape functional connectivity. Anchor areas are defined as habitat fragments which are among the largest present in the landscape and the most important for maintaining the landscape functional connectivity, as quantified by the Integral Index of Connectivity (IIC). Recommended actions include increasing the protection of the anchor areas and restoring smaller fragments in their neighborhood whose size and placement make them convenient "stepping stones" in the establishment of ecological corridors between the anchor areas and other areas with a potentially high biological importance. We illustrate our approach with an analysis of the sizes and functional connections between remaining forest fragments in the "Mesopotamia of Biodiversity", a portion of Brazilian Atlantic Forest with an especially rich biodiversity situated between the rivers Jequitinhonha and Doce.

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Section: Methodscontrasting

confidence: 42%

Anchor Areas to Improve Conservation and Increase Connectivity within the Brazilian Mesopotamia of Biodiversity

Holvorcem¹,

Tambosi²,

Ribeiro³

et al. 2011

Nat. Conserv.

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“…Mittermeier 1986), due to their charismatic attributes. Due to its ability to move inside habitat mosaics, these mammals have been used also as landscape species, contributing to conservation planning in larger scales (Bani et al 2002, Sanderson et al 2002a, Crouzeilles et al 2010.…”

Section: Introductionmentioning

confidence: 99%

Medium and large-sized mammals of the Reserva Ecológica de Guapiaçú, Cachoeiras de Macacu, RJ

2014

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Medium and large-sized terrestrial mammals develop important functions in ecosystems maintenance. However, this group is the most vulnerable to local extinctions, through habitat loss or hunting. This study inventoried the community of medium and large mammals in the Reserva Ecológica de Guapiaçú (REGUA), Cachoeiras de Macacu, RJ, providing data on species composition, richness and abundance. Species were registered through the use of camera traps, sign survey and visual encounters on pre-existing trails and roads. The study was conducted from January to October 2012, with each month considered as a sample unit. An effort of 1568 cameras-day and 120 km traveled, resulted on 302 records of 22 species of medium and large-sized mammals, belonging to eight orders. This value corresponds to more than three-quarters of the richness described from this group in the Atlantic Forest of Rio de Janeiro state. Five species are under some level of regional, national or global threat. Three game species, Pecari tajacu, Cuniculus paca and Dasyprocta leporina were abundant in the area. The observed richness was comparable to that found in other studies conducted in rain forests. Thus, for its high number of species, including those under some degree of threat, we conclude that REGUA is an important area to mammal conservation, especially in the Atlantic Forest of Rio de Janeiro state.

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“…1.4 km; Ribeiro et al 2009). Therefore, even simple models based on inter-patch distance can be useful to establish general guidelines to design NPAs for multiple species, considering that this metric is one of the main variables influencing gap-crossing and inter-patch movements (Awade & Metzger 2008 (Crouzeilles et al 2010). In the absence of such data, our results of largest inter-patch distance in the shortest pathway between SPAs may be used to/as: (1) a surrogate for shortest gap-crossing for mammal species, a parameter required to design NPAs between pairs of SPAs, (2) identify which pairs of SPAs may be connected for species that have gap crossing information, and (3) a base to indicate pairs of SPAs, which will be connected after studies of gap crossing and inter-patch movements for other species.…”

Section: Discussionmentioning

confidence: 99%

“…SPA2), it means that the shortest distance that need to be searched are among SPA1 -SPA2 and SPA2 -SPA3. After, as gap-crossing data are scarce for Atlantic Forest species (Crouzeilles et al 2010), we used two approaches to search for the shortest pathway between each selected pairs of SPAs: an euclidean distance and a simplified effective distance model. The euclidean model builds inter-patch distance through a linear estimation between nearest-neighbor nodes on binary maps.…”

Section: Modeling Graphsmentioning

confidence: 99%

“…Functional connectivity, on the other hand, depends on the gap-crossing capability of the species (the species capability to transpose the matrix; Awade & Metzger, 2008), as well as on costs associated to species dispersal random walk behavior (Zollner & Lima 1999;Tishendorf & Fahrig 2000). In some cases, landscape structure is the only way to assess landscape connectivity (Taylor et al 2006), given that the analysis of organism's responses requires detailed data (Tishendorf & Fahrig 2000;Pinto & Keitt 2009;Crouzeilles et al 2010). For regions with few available data about species' movements and gap-crossing abilities, landscape structure properties such as inter-patch distance and matrix permeability can be useful parameters to establish general guidelines to design NPAs for multiple species in fragmented landscapes.…”

Section: Introductionmentioning

confidence: 99%

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Applying Graph Theory to Design Networks of Protected Areas: Using Inter-Patch Distance for Regional Conservation Planning

Crouzeilles¹,

Lorini²,

Grelle³

2011

Nat. Conserv.

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Protected Areas alone may not be large enough to sustain viable populations; thus an alternative is establishing effective networks of protected areas (NPAs). When data on functional connectivity are scarce, landscape structure is viable way to evaluate landscape connectivity. Here we applied the graph approach at the regional scale (Rio de Janeiro state) to design NPAs to conserve several terrestrial mammal species. We used Euclidean and effective distances to compare the number of connections for each protected area. We found that inter-patch distance is a useful metric to design NPAs. Moreover, some protected areas are critically isolated, as indicated by the effective distance. Although several studies use data and models of high specificity, most of them are local and few can be immediately applied for conservation purposes. The methodology used here can help in planning NPAs in a straightforward way providing practitioners with simple analyses and few landscape data.

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Deslocamento Na Matriz Para Espécies Da Mata Atlântica E a Dificuldade Da Construção De Perfis Ecológicos

Cited by 27 publications

References 97 publications

Anchor Areas to Improve Conservation and Increase Connectivity within the Brazilian Mesopotamia of Biodiversity

Anchor Areas to Improve Conservation and Increase Connectivity within the Brazilian Mesopotamia of Biodiversity

Medium and large-sized mammals of the Reserva Ecológica de Guapiaçú, Cachoeiras de Macacu, RJ

Applying Graph Theory to Design Networks of Protected Areas: Using Inter-Patch Distance for Regional Conservation Planning

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