Small mammals respond to extreme habitat fragmentation in the Brazilian Atlantic Forest according to the landscape continuum model

2020 ◽  
Vol 65 (2) ◽  
pp. 309-322 ◽  
Author(s):  
Gabriela Paise ◽  
Emerson M. Vieira ◽  
Paulo Inácio Prado
Keyword(s):  
Habitat Fragmentation ◽  
Atlantic Forest ◽  
Small Mammals ◽  
Continuum Model ◽  
Brazilian Atlantic Forest ◽  
Extreme Habitat

scholarly journals Habitat fragmentation affects individual condition: evidence from small mammals of the Brazilian Atlantic Forest

2018 ◽  
Vol 99 (4) ◽  
pp. 936-945 ◽  
Author(s):  
Ana Cláudia Delciellos ◽  
Camila dos Santos de Barros ◽  
Jayme Augusto Prevedello ◽  
Mariana Silva Ferreira ◽  
Rui Cerqueira ◽  
...  
Keyword(s):  
Habitat Fragmentation ◽  
Atlantic Forest ◽  
Small Mammals ◽  
Brazilian Atlantic Forest ◽  
Individual Condition

scholarly journals Habitat fragmentation in the Brazilian Atlantic Forest is associated with erosion of frog immunogenetic diversity and increased fungal infections

2021 ◽  
Author(s):  
Anat Belasen ◽  
Kevin Amses ◽  
Rebecca Clemons ◽  
Guilherme Becker ◽  
Felipe Toledo ◽  
...  
Keyword(s):  
Habitat Fragmentation ◽  
Atlantic Forest ◽  
Batrachochytrium Dendrobatidis ◽  
Fungal Infections ◽  
Emerging Infectious Diseases ◽  
Genetic Erosion ◽  
Population Level ◽  
Brazilian Atlantic Forest ◽  
Frog Species ◽  
Mhc Iib

Habitat fragmentation and infectious disease threaten amphibians globally, but little is known about how these two threats interact. In this study, we examined the effects of Brazilian Atlantic Forest habitat fragmentation on frog genetic diversity at an immune locus known to affect disease susceptibility in amphibians, the MHC IIB locus. We used a custom high-throughput assay to sequence the MHC IIB locus across six focal frog species in two regions of the Atlantic Forest. We also used a molecular assay to quantify infections by the fungal pathogen Batrachochytrium dendrobatidis (Bd). We found that habitat fragmentation is associated with genetic erosion at the MHC IIB locus, and that this erosion is most severe in frog species restricted to intact forests. Significant Bd infections were recovered only in one Atlantic Forest region, potentially due to the relatively higher elevation. In this region, forest specialists showed an increase in both Bd prevalence and loads in fragmented habitats. We also found that reduced population-level MHC IIB diversity was associated with increased Bd infection risk. On the individual-level, MHC IIB heterozygotes (by allelic genotype as well as supertype) exhibited a reduced risk of Bd infection. Our results suggest that habitat fragmentation increases infection susceptibility in amphibians, mediated at least in part through loss of immunogenetic diversity. Our findings have implications for the conservation of fragmented populations in the face of emerging infectious diseases.

Fair tests of the habitat amount hypothesis require appropriate metrics of patch isolation: An example with small mammals in the Brazilian Atlantic Forest

2018 ◽  
Vol 226 ◽  
pp. 264-270 ◽  
Author(s):  
Marcus Vinícius Vieira ◽  
Mauricio Almeida-Gomes ◽  
Ana Cláudia Delciellos ◽  
Rui Cerqueira ◽  
Renato Crouzeilles
Keyword(s):  
Atlantic Forest ◽  
Small Mammals ◽  
Brazilian Atlantic Forest ◽  
Habitat Amount ◽  
Patch Isolation ◽  
Habitat Amount Hypothesis

When does habitat fragmentation matter? A biome‐wide analysis of small mammals in the Atlantic Forest

2019 ◽  
Vol 46 (12) ◽  
pp. 2811-2825
Author(s):  
Ana Filipa Palmeirim ◽  
Marcos S. L. Figueiredo ◽  
Carlos Eduardo Viveiros Grelle ◽  
Chris Carbone ◽  
Marcus Vinícius Vieira
Keyword(s):  
Habitat Fragmentation ◽  
Atlantic Forest ◽  
Small Mammals

The effect of habitat fragmentation on the scorpion assemblage of a Brazilian Atlantic Forest

2016 ◽  
Vol 20 (3) ◽  
pp. 457-466 ◽  
Author(s):  
André F. A. Lira ◽  
Victor L. N. de Araújo ◽  
Adriano M. DeSouza ◽  
Felipe N. A. A. Rego ◽  
Cleide M. R. Albuquerque
Keyword(s):  
Habitat Fragmentation ◽  
Atlantic Forest ◽  
Brazilian Atlantic Forest

Effects of habitat fragmentation on ant richness and functional composition in Brazilian Atlantic forest

2012 ◽  
Vol 21 (7) ◽  
pp. 1687-1701 ◽  
Author(s):  
Inara R. Leal ◽  
Bruno K. C. Filgueiras ◽  
Juliana P. Gomes ◽  
Luciana Iannuzzi ◽  
Alan N. Andersen
Keyword(s):  
Habitat Fragmentation ◽  
Atlantic Forest ◽  
Brazilian Atlantic Forest ◽  
Functional Composition

scholarly journals The effects of habitat availability and quality on small mammals abundance in the Brazilian Atlantic Forest

2015 ◽  
Vol 13 (2) ◽  
pp. 133-138 ◽  
Author(s):  
Reginaldo Honorato ◽  
Renato Crouzeilles ◽  
Mariana S. Ferreira ◽  
Carlos E.V. Grelle
Keyword(s):  
Atlantic Forest ◽  
Small Mammals ◽  
Habitat Availability ◽  
Brazilian Atlantic Forest

scholarly journals The influence of anthropogenic habitat fragmentation on the genetic structure and diversity of the malaria vector Anopheles cruzii (Diptera: Culicidae)

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Laura Cristina Multini ◽  
Ana Letícia da Silva de Souza ◽  
Mauro Toledo Marrelli ◽  
André Barretto Bruno Wilke
Keyword(s):  
Genetic Structure ◽  
Habitat Fragmentation ◽  
Atlantic Forest ◽  
Ground Level ◽  
Brazilian Atlantic Forest ◽  
Anthropogenic Changes ◽  
Anthropogenic Habitat ◽  
Genetic Diversity And Structure ◽  
Genetic Structure And Diversity ◽  
Anopheles Cruzii

Abstract Fragmentation of natural environments as a result of human interference has been associated with a decrease in species richness and increase in abundance of a few species that have adapted to these environments. The Brazilian Atlantic Forest, which has been undergoing an intense process of fragmentation and deforestation caused by human-made changes to the environment, is an important hotspot for malaria transmission. The main vector of simian and human malaria in this biome is the mosquito Anopheles cruzii. Anthropogenic processes reduce the availability of natural resources at the tree canopies, An. cruzii primary habitat. As a consequence, An. cruzii moves to the border of the Atlantic Forest nearing urban areas seeking resources, increasing their contact with humans in the process. We hypothesized that different levels of anthropogenic changes to the environment can be an important factor in driving the genetic structure and diversity in An. cruzii populations. Five different hypotheses using a cross-sectional and a longitudinal design were tested to assess genetic structure in sympatric An. cruzii populations and microevolutionary processes driving these populations. Single nucleotide polymorphisms were used to assess microgeographic genetic structure in An. cruzii populations in a low-endemicity area in the city of São Paulo, Brazil. Our results show an overall weak genetic structure among the populations, indicating a high gene flow system. However, our results also pointed to the presence of significant genetic structure between sympatric An. cruzii populations collected at ground and tree-canopy habitats in the urban environment and higher genetic variation in the ground-level population. This indicates that anthropogenic modifications leading to habitat fragmentation and a higher genetic diversity and structure in ground-level populations could be driving the behavior of An. cruzii, ultimately increasing its contact with humans. Understanding how anthropogenic changes in natural areas affect An. cruzii is essential for the development of more effective mosquito control strategies and, on a broader scale, for malaria-elimination efforts in the Brazilian Atlantic Forest.

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