Estrutura populacional de capivaras na Estação Ecológica do Taim, Brasil, RS

Garcias, Felipe M.; Bager, Alex

doi:10.1590/s0103-84782009000800026

Cited by 14 publications

(10 citation statements)

References 14 publications

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“…In Taim Ecological Station, in the state of Rio Grande do Sul, Brazil (Fig. 8.1 ), groups included circa 58% adults, 25% juveniles, and 17% infants (Garcias and Bager 2009 ) . Age structures may also differ between the two capybara species: Aldana-Domínguez et al ( 2002 ) found a predominance of adults in populations of H. hydrochaeris in Colombia, but a more balanced adult to juvenile ratio was found by Ballesteros ( 2001 ) for Hydrochoerus isthmius .…”

Section: Age Structurementioning

confidence: 99%

Capybara Demographic Traits

Moreira

Wiederhecker²,

Ferraz

et al. 2012

Capybara

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Section: Age Structurementioning

confidence: 99%

Capybara Demographic Traits

Moreira

Wiederhecker²,

Ferraz

et al. 2012

Capybara

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“…Capybaras are the world's largest rodent and adults stand about 50 cm tall and can weigh around 54 kg (males) -62 kg (females) (Eisenberg & Redford 1999, Ferraz et al 2005. These rodents of unusual size are considered food and habitat generalists, have high reproductive capacity, and combined with a decline of large predators, they can reach high population densities in anthropogenic landscapes, including the central region of São Paulo State (Verdade & Ferraz 2006, Garcias & Bager 2009. Because of the size and weight of capybara and their abundance, collisions with vehicles are a serious concern.…”

Section: Introductionmentioning

confidence: 99%

MAMMAL ROAD MORTALITY AND COST–BENEFIT ANALYSES OF MITIGATION MEASURES AIMED AT REDUCING COLLISIONS WITH CAPYBARA ( Hydrochoerus hydrochaeris ) IN SÃO PAULO STATE, BRAZIL

2013

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We recorded 26 mammal species or species groups as roadkill along seven highways in São Paulo State, Brazil. Capybara (Hydrochoerus hydrochaeris)-vehicle collisions were the most frequently reported species and, because of their size and weight, they can cause substantial vehicle damage and are a serious threat to human safety. Other roadkilled species such as maned wolf (Chrysocyon brachyurus), giant anteater (Myrmecophaga tridactyla) and oncilla (Leopardus tigrinus) indicate there may also be a conservation concern that could warrant the implementation of mitigation measures aimed at reducing wildlife-vehicle collisions and providing safe crossing opportunities. For this paper we investigated a potential third argument for the implementation of mitigation measures: economics. We calculated vehicle repair costs associated with capybara-vehicle collisions based on interviews with personnel from car repair shops. In addition, we reviewed the effectiveness of wildlife fencing in combination with wildlife crossing structures in reducing collisions with large mammals. We then estimated the costs for four mitigation measures (fencing with and without three types of culverts). These data were used to conduct cost-benefit analyses over a 75-year period using discount rates of 1%, 3%, and 7% to identify the threshold values (in 2012 R$) above which the four individual mitigation measures start generating benefits in excess of costs. These threshold values were translated into the number of capybara-vehicle collisions that need to occur per kilometer per year for a mitigation measure to start generating economic benefits in excess of costs. For example, based on an analysis with average vehicle repair costs and a 3% discount rate, we calculated that with at least 5.4 capybara-vehicle collisions per kilometer per year, a combination of wildlife fencing and any of the three culvert types would be economically feasible. In addition, we calculated the total costs associated with capybara-vehicle collisions on seven major highways in São Paulo State, Brazil, and we compared these to the threshold values. Finally, we conducted more detailed cost analyses for the seven highways to illustrate that even though the costs for capybara-vehicle collisions may not justify the implementation of measures along an entire highway, specific locations along a highway can still exceed thresholds. We believe the cost-benefit model presented in this paper can be a valuable decision support tool to help select locations and implement mitigation measures. These measures improve human safety, are likely to benefit nature conservation, and are economically justified even based on very conservative cost-benefit analyses. We do stress though that the threshold values presented in this paper are based on a series of assumptions and estimates and that they should be taken as indicative values rather than exact values.

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“…A census performed in the State of Rio Grande do Sul by Garcias and Bager (2009) reported a 6.6 ± 0.1 female per male ratio for capybaras. The same study stated that capybaras are animals that live in groups ranging from two to 40 individuals and each flock has a dominant male that establishes a harem.…”

Section: Discussionmentioning

confidence: 99%

Anti-Rickettsia rickettsii antibodies in capybaras (Hydrochoerus hydrochaeris Linnaeus, 1766) from an agricultural landscape in Araras, São Paulo, Brazil

Pacheco

Filho

Rocha

et al. 2017

SCA

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Spotted fever is a typically endemic infectious disease caused by rickettsiae from the spotted fever group, of which Rickettsia rickettsii is the main etiologic agent. It presents high mortality rates in Brazil, with transmission to humans or animals through the bite of infected ticks. The capybara (Hydrochoerus hydrochaeris) is an important reservoir for Rickettsia spp.; these bacteria can circulate in an infected animal presenting only fever as a clinical sign of the disease, as demonstrated by experimental infection. Considering the high zoonotic potential and the damage caused to human, animal, and environmental health, this study searched for anti-Rickettsia rickettsii antibodies in capybaras from an agricultural landscape in the city of Araras, State of São Paulo, Brazil. The indirect immunofluorescence (IFA) technique was used to detect anti-R. rickettsii antibodies. From the 28 serum samples tested using IFA, 18 (64.28%) were considered reactive, with antibody titers ranging from 256 to 2048. Seven (38.88%) samples presented titers of 256, three (16.67%) with titers of 512, five (27.78%) with titers of 1024, and three (16.67%) with titers of 2048. However, it was not possible to significantly associate gender to these serologic results. These results demonstrate that at some point during their lives, the studied capybaras were exposed to the etiologic agent, but it is impossible to know when this occurred. Further studies need to be performed to clarify which serological titers ensure an infection in capybaras, based on clinical and laboratory assessment of rickettsemia, and to establish the relationship between titers and the chronicity of disease. This is necessary owing to the possibility of cross-reactions with other rickettsiae species of the same subgroup, leading to the need for molecular tests to confirm diagnosis.

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Estrutura populacional de capivaras na Estação Ecológica do Taim, Brasil, RS

Cited by 14 publications

References 14 publications

Capybara Demographic Traits

Capybara Demographic Traits

MAMMAL ROAD MORTALITY AND COST–BENEFIT ANALYSES OF MITIGATION MEASURES AIMED AT REDUCING COLLISIONS WITH CAPYBARA ( Hydrochoerus hydrochaeris ) IN SÃO PAULO STATE, BRAZIL

Anti-Rickettsia rickettsii antibodies in capybaras (Hydrochoerus hydrochaeris Linnaeus, 1766) from an agricultural landscape in Araras, São Paulo, Brazil

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