Browsing by Author "Rabanal, Felipe"

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    Current threats faced by amphibian populations in the southern cone of South America
    (2022) Pablo Kacoliris, Federico; Berkunsky, Igor; Carlos Acosta, Juan; Acosta, Rodrigo; Gabriela Agostini, Maria; Sebastian Akmentins, Mauricio; Luz Arellano, Maria; Azat, Claudio; Carla Bach, Nadia; Mirta Blanco, Graciela; Calvo, Rodrigo; Charrier, Andres; Corbalan, Valeria; Correa, Claudio; Elena Cuello, Maria; Deutsch, Camila; Di-Pietro, Diego; Soledad Gaston, Maria; Gomez-Ales, Rodrigo; Kass, Camila; Kass, Nicolas; Lobos, Gabriel; Agustin Martinez, Tomas; Martinez-Aguirre, Tomas; Mora, Marta; Nieva-Cocilio, Rodrigo; Pastore, Hernan; Manuel Perez-Iglesias, Juan; Piaggio-Kokot, Lia; Rabanal, Felipe; Jesus Rodriguez-Munoz, Melina; Cecilia Sanchez, Laura; Tala, Charif; Ubeda, Carmen; Vaira, Marcos; Alicia Velasco, Melina; Vidal, Marcela; Daniel Williams, Jorge
    In this work, we update and increase knowledge on the severity and extent of threats affecting 57 populations of 46 amphibian species from Chile and Argentina in southern South America. We analyzed the intrinsic conser-vation problems that directly impact these populations. We shared a questionnaire among specialists on threats affecting target amphibian populations with information on i) range, ii) historical occurrence and abundance, iii) population trends, iv) local extinctions, v) threats, and vi) ongoing and necessary conservation/research. We assessed association patterns between reported threats and population trends using multiple correspondence analysis. Since 2010, 25 of 57 populations have declined, while 16 experienced local extinctions. These pop-ulations were affected by 81% of the threat categories analyzed, with those related to agricultural activities and/ or habitat modifications being the most frequently reported. Invasive species, emerging diseases, and activities related to grazing, ranching, or farming were the threats most associated with population declines. Low con-nectivity was the most frequent intrinsic conservation problem affecting 68% of the target populations, followed by low population numbers, affecting 60%. Ongoing monitoring activity was conducted in 32 (56%) populations and was the most frequent research activity. Threat mitigation was reported in 27 (47%) populations and was the most frequent ongoing management activity. We found that habitat management is ongoing in 5 (9%) pop-ulations. At least 44% of the amphibian populations surveyed in Chile and Argentina are declining. More in-formation related to the effect of management actions to restore habitats, recover populations, and eliminate threats such as invasive species is urgently needed to reverse the conservation crisis facing amphibians in this Neotropical region.
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    Natural history of the Mocha Island ground frog Eupsophus insularis, a critically endangered species
    (2021) Lobos, Gabriel; Rebolledo, Nicolas; Charrier, Andres; Correa, Claudio; Rabanal, Felipe; Vidal, Marcela
    Eupsophus insularis inhabits a small island in the southeast Pacific, and its natural history is unknown. The species is listed as Critically Endangered based on its restricted distribution, i.e., an island under ongoing habitat deterioration. We assessed the distribution, habitat requirements, density, diet, and threats of the species with the aim of proposing strategies for its conservation. The species is restricted to a terrestrial strip 24-205 m above sea level associated with pristine temperate humid forests located in areas of low slope. A capture-recapture study indicated that its density was 15-66 individuals/ha of optimal habitat. Its diet is composed mainly of invertebrates of the humid forest floor. The high prevalence of chytrid fungus and habitat loss are important threats to the species. Herein, we present data to help with the management of the species on the island and that might help in designing more robust strategies to mitigate present and future threats.