Abundância de roedores reservatórios de hantavírus no bioma da Mata Atlântica: efeitos da estrutura da paisagem e da escala de análise

Prado, Amanda Francisco

doi:10.11606/d.41.2015.tde-25092015-155043

Cited by 2 publications

(2 citation statements)

References 78 publications

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“…Sobre la base de estos análisis citados, se designaron tres pares de parcelas de acuerdo con la calidad del hábitat, definidas en términos de degradación: menos degradado (B y H), medio degradado (A y D) y más degradado (C y G). Tres parcelas (H, D, y C) fueron seleccionadas para el aumento experimental de los recursos alimenticios y las otras tres (B, A y G) per-pederos de patógenos (Prist 2016), ya que se relacionan más con la estructura del hábitat (Prado 2015;Prist 2016). Cuando las alteraciones antrópicas, como por ejemplo la agricultura, enriquecen el medio ambiente para los hospederos, pareciera aumentar también su abundancia, y por lo tanto la prevalencia de los patógenos (Goodin et al 2006;Dearing y Dizney 2010).…”

Section: Introductionunclassified

Population characteristics of Akodon montensis (Sigmodontinae) in response to habitat degradation and food availability

Sánchez-Martínez

Owen

2021

Therya

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Small mammal populations can be affected by habitat degradation, causing changes in their abundance, density and movement. Akodon montensis, a persistent host for Orthohantavirus, is a common rodent species in primary and secondary forest habitats and is considered a generalist species. This paper analyzes how habitat degradation and resource availability affect the population characteristics of the species. Six plots were classified into three levels of degradation, with sampling conducted in June and November 2015. After the June sampling, three plots were selected for the increase of food resources for three months, to assess how this factor affects the population. Abundance was estimated with the capture-mark-recapture method and density was estimated by dividing abundance by the effective sampling area. Home range was calculated using the Minimum Convex Polygon method, and the Maximum Distance Traveled as the longest average movement between two sampling stations where an individual was encountered. More degraded habitats supported lower average density and abundance of A. montensis compared to less degraded habitats. Increasing food availability led to increases in abundance in the more degraded habitats and decreases in the least degraded. Changes in home range were most evident, decreasing in the least degraded plots after the increase in resources. The sex ratio did not differ from equity in any plot, nor with respect to any of the factors studied. Population characteristics of the species are determined by several factors, including habitat quality and food distribution and abundance. If changes occur in these factors (either artificially or naturally) then movement, abundance and population density are affected in response to such changes. Although some results were not statistically significant, an apparent interaction was observed between habitat quality and resource availability, thereby influencing the abundance and density of A. montensis.

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Section: Introductionunclassified

Population characteristics of Akodon montensis (Sigmodontinae) in response to habitat degradation and food availability

Sánchez-Martínez

Owen

2021

Therya

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“…To do so we extracted the abundance rodent data obtained in Prado (2015) were standardized, centered on their means and divided by two standard deviations. The model with the lower AIC were used in the Bayesian analysis (Table S2 shows the results of the best models of exploratory analysis for both regions; for cerrado we also shown the first model with rodent included -once it does not appear in the best models selected).…”

Section: Cerradomentioning

confidence: 99%

Hantavirus transmission risk in function of climate and landscape structure

Prist¹

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Hantavirus Cardiopulmonary Syndrome (HCPS) is a disease caused by Hantavirus, which are negative-sense RNA viruses in the family Bunyaviridae. These viruses are highly virulent to humans, taking about 50% of infected people to death. The main Hantavirus reservoir is constituded by generalist rodents species, which increase in abundance in agricultural and fragmented landscapes, potencially augmenting the transmission risk of the disease. Climate can also affect rodent population dynamics and the virus survival in the environment, as well as the time it remains virulent, while social factors may regulate the processes of transmitting viruses from reservoirs to humans. However, despite the high virulence of these viruses and the lack of vaccine is not yet well established how these different factors linked to landscape structure, climate and social conditions affect the dynamics of transmission of the disease. Thus, this study aimed to: 1) identify which social and ecological factors affect the transmission of HCPS, identifying the areas of greatest risk in the state of São Paulo and 2) predict how climate change (RCP4.5 and RCP8.5) and expansion of sugarcane scenarios influence the transmission of HCPS. To answer these questions the study system corresponded to the 645 municipalities that compose the state of São Paulo. To achieve our goals, in a first chapter, we conducted a literature review to understand how landscape structure and climate variables affect the risk of HCPS. In a second chapter we used a Bayesian model to quantify the association between HCPS annual incidence in the state of São Paulo, obtained by the number of cases confirmed by the Ministry of Health, between the years 1993-2012, and climate variables (total annual precipitation and mean annual temperature), landscape structure (percentage of native vegetation, number of fragments and percentage of area occupied with sugarcane), chosen in the literature review, and social factors (number of rural men over 14 years-risk population, and the Human Development Index-HDI). We build separate models for the Atlantic Forest and the Cerrado. In both biomes, the risk of HCPS increased mainly with the proportion of land cultivated with sugarcane and the HDI, but the proportion of native habitat, mean annual temperatures and risk population also showed positive relationships to Atlantic Forest. The average risk of HCPS for the state of São Paulo was 1.3%, with 6% of the municipalities being classified as medium to high risk (≥ 5%). In a third chapter we used sugarcane expansion and extracted temperature anomalies of RCP4.5 and RCP8.5 scenarios of general circulation models (GCMs) of IPCC5 to predict HCPS risk. With sugarcane expansion, average risk for HCPS increases from 1.3 to 1.5%, while RCP4.5 and RCP8.5 scenarios increased the risk to 1.6% and 1.7%, respectively. RCP4.5 and RCP8.5 scenarios alone are responsible for the largest increase in the maximum risk of infection (46.1% to 51.4% and 51.7%), while the sugarcane expansion combined with climate sc...

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Abundância de roedores reservatórios de hantavírus no bioma da Mata Atlântica: efeitos da estrutura da paisagem e da escala de análise

Cited by 2 publications

References 78 publications

Population characteristics of Akodon montensis (Sigmodontinae) in response to habitat degradation and food availability

Population characteristics of Akodon montensis (Sigmodontinae) in response to habitat degradation and food availability

Hantavirus transmission risk in function of climate and landscape structure

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