Dubois-Gagnon2021

Référence

Dubois-Gagnon, M.-P. (2021) Répartition spatiale de la rainette faux-grillon boréale (Pseudacris maculata) en milieu urbain évaluée à l’aide de l’ADN environnemental. Mémoire de maîtrise, Université Laval. (URL )

Résumé

Current extinction rates of vertebrates are 100–1000 times greater than background rates. Amphibians comprise the most threatened vertebrate group with approximately 41% of the species at risk. The boreal chorus frog (Pseudacris maculata) is particularly at risk of extinction in the provinces of Québec and Ontario, Canada. In order to have a better understanding of the species distribution, we quantified the influence of several local and landscape characteristics on the occurrence of the species in wetlands of the St. Lawrence Lowlands in southern Québec. We hypothesized that site occupancy depends on local characteristics and is favored by landscape characteristics that contribute to site connectivity. We also hypothesized that the amount and proximity of anthropic disturbances negatively affect the occurrence of the species. We used environmental DNA (eDNA) as well as traditional call surveys to determine site occupancy and to test whether the former approach led to a higher detection probability than the latter. We collected water samples at 180 sites in 2017 and 2018, whereas we surveyed a subset of 63 sites using both eDNA and call surveys in 2018. Our analyses indicate that site occupancy was higher in 2018 than in 2017 and higher in sites where the species had been previously detected during the last 12 years by other studies. Site occupancy did not vary with other local and landscape characteristics, in part due to a decrease in the number of sites occupied by the species and its rarity in our study area. Additionally, detection probability via eDNA (0.81; 95% CI:[0.31; 0.98]) was similar to that of call surveys (0.62; 95% CI: [0.25; 0.89]).

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@MASTERSTHESIS { Dubois-Gagnon2021,
    TITLE = { Répartition spatiale de la rainette faux-grillon boréale (Pseudacris maculata) en milieu urbain évaluée à l’aide de l’ADN environnemental },
    AUTHOR = { Dubois-Gagnon, M.-P. },
    SCHOOL = { Université Laval },
    YEAR = { 2021 },
    NOTE = { CEFTMS, Bernatchez, L. and Mazerolle, M.J. },
    ABSTRACT = { Current extinction rates of vertebrates are 100–1000 times greater than background rates. Amphibians comprise the most threatened vertebrate group with approximately 41% of the species at risk. The boreal chorus frog (Pseudacris maculata) is particularly at risk of extinction in the provinces of Québec and Ontario, Canada. In order to have a better understanding of the species distribution, we quantified the influence of several local and landscape characteristics on the occurrence of the species in wetlands of the St. Lawrence Lowlands in southern Québec. We hypothesized that site occupancy depends on local characteristics and is favored by landscape characteristics that contribute to site connectivity. We also hypothesized that the amount and proximity of anthropic disturbances negatively affect the occurrence of the species. We used environmental DNA (eDNA) as well as traditional call surveys to determine site occupancy and to test whether the former approach led to a higher detection probability than the latter. We collected water samples at 180 sites in 2017 and 2018, whereas we surveyed a subset of 63 sites using both eDNA and call surveys in 2018. Our analyses indicate that site occupancy was higher in 2018 than in 2017 and higher in sites where the species had been previously detected during the last 12 years by other studies. Site occupancy did not vary with other local and landscape characteristics, in part due to a decrease in the number of sites occupied by the species and its rarity in our study area. Additionally, detection probability via eDNA (0.81; 95% CI:[0.31; 0.98]) was similar to that of call surveys (0.62; 95% CI: [0.25; 0.89]). },
    URL = { https://corpus.ulaval.ca/jspui/handle/20.500.11794/68168 },
    TIMESTAMP = { 2021-09-09 },
}

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