Estimativa de mortalidade de vertebrados silvestres por atropelamento e colisão, em um trecho rodoviário estadual, no Vale do Taquari, RS
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Date
2019-11
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Perico, Eduardo
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Abstract
Embora rodovias sejam importantes e necessárias para as mais diversas atividades humanas, elas causam impactos ao meio ambiente, especialmente à fauna nativa, em função dos atropelamentos e colisões. Este trabalho buscou estimar as fatalidades de vertebrados silvestres em um trecho de 10 quilômetros da RST-453, no Vale do Taquari. Foram realizadas 12 incursões, entre setembro e outubro de 2019, à porção localizada entre os quilômetros 44 e 54 da Rota do Sol. Contabilizou-se 96 carcaças, das quais 37 (38,54%) eram aves, 37 (38,54%) mamíferos, 16 (16,66%) anfíbios e 6 (6,25%) répteis, sendo que destes, 29,16% (aves = 13; mamíferos = 5; anfíbios = 10) não puderam ter seus grupos identificados por conta do estado de degradação das carcaças. Utilizando-se os testes estimativa de mortalidade (p = 0,45; Tr/dias = 3,25), bidimensionais K de Ripley e análise de hotspots (p <0,05) do software Siriema 2.0, foi estimada a taxa de atropelamentos em 7,87 ind/dia, que corresponde a 0,78 animais atropelados por quilômetro amostrado, com os maiores hotspots associados ao principal recurso hídrico da área, o Arroio Boa Vista. Foi detectada uma alta taxa de atropelamentos, índice que pode estar superestimado, pelo viés da estação e por não ter sido atingida a suficiência amostral, face à curta duração das amostragens, evidenciando a necessidade de um período maior de observações.
Although highways are important and necessary for the most diverse human activities, they cause impacts on the environment, especially native fauna, due to roadkill and collisions. This study aimed to estimate wild vertebrates fatalities in a 10 km stretch of RST-453, in the Taquari Valley. Twelve incursions were made between September and October 2019 to the portion located between kilometers 44 and 54 of Rota do Sol. There were 96 carcasses, from which 37 (38.54%) were birds, 37 (38.54%) mammals, 16 (16.66%) amphibians and 6 (6.25%) reptiles, of these 29.16% (birds = 13; mammals = 5; amphibians = 10) could not have their groups identified due to the state of carcass degradation. Using the “mortality estimation” tests (p = 0.45; Rr/days = 3.25), 2-d Ripley's K function and 2-d hotspot analysis (p <0.05) from Siriema 2.0 software, the estimated rate of run over at 7.87 ind/day, which corresponds to 0.78 animals run over per sampled kilometer, with the largest hotspots associated with the main water resource in the area, Boa Vista stream. A high roadkill rate was detected, an index that may be overestimated due to the season bias and because the sample sufficiency was not reached due to the short duration of the samples, evidencing the need for a longer observation period.
Although highways are important and necessary for the most diverse human activities, they cause impacts on the environment, especially native fauna, due to roadkill and collisions. This study aimed to estimate wild vertebrates fatalities in a 10 km stretch of RST-453, in the Taquari Valley. Twelve incursions were made between September and October 2019 to the portion located between kilometers 44 and 54 of Rota do Sol. There were 96 carcasses, from which 37 (38.54%) were birds, 37 (38.54%) mammals, 16 (16.66%) amphibians and 6 (6.25%) reptiles, of these 29.16% (birds = 13; mammals = 5; amphibians = 10) could not have their groups identified due to the state of carcass degradation. Using the “mortality estimation” tests (p = 0.45; Rr/days = 3.25), 2-d Ripley's K function and 2-d hotspot analysis (p <0.05) from Siriema 2.0 software, the estimated rate of run over at 7.87 ind/day, which corresponds to 0.78 animals run over per sampled kilometer, with the largest hotspots associated with the main water resource in the area, Boa Vista stream. A high roadkill rate was detected, an index that may be overestimated due to the season bias and because the sample sufficiency was not reached due to the short duration of the samples, evidencing the need for a longer observation period.
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Keywords
Atropelamento de fauna; Ecologia de Estradas; Mortalidade em empreendimentos lineares; Wildlife roadkill; Road ecology; Mortality in linear enterprises
Citation
VOGNACH, Pauline Amanda. Estimativa de mortalidade de vertebrados silvestres por atropelamento e colisão, em um trecho rodoviário estadual, no Vale do Taquari, RS. 2019. Artigo (Graduação) – Curso de Ciências Biológicas - Bacharelado, Universidade do Vale do Taquari - Univates, Lajeado, 11 nov. 2019. Disponível em: http://hdl.handle.net/10737/2995.