Dynamics of two passerine populations in the southernmost forest of the world

Diplôme Master Dynamics of two passerine populations in the southernmost forest of the world eng 2021-07-02 2021-09-21 author Sonno Loris Youri 928930 director Currat Mathias 0000-0001-5211-8922 89701 director Quilodran Claudio 0000-0001-7197-9154 753257 50 The population dynamics of passerine birds could be strongly influenced by human induced climate change. Annual variation in climatic variables has been shown to impact, for example, their daily activity patterns and food availability, which in turn could a effect the survival and reproduction of birds. During the last two decades, climate conditions have evolved in the sub-Antarctic temperate forests of South America, mainly because of the climatic phenomenons El Nino and La Nina. Nevertheless, only a few long-term monitoring studies have been made in this regions on the effect of climate variables on the dynamics of bird populations. Hence, my study analyses the monthly evolution of two passerines populations, the Patagonian Sierra-Finch (Phrygilus patagonicus) and the Thorn-tailed Rayadito (Aphrastura spinicauda) over the last 20 years on the Omora Ethnobotanical Park of the Cape Horn Biosphere Reserve, Navarino Island, in Chile. The effect of monthly average temperature, precipitations and snow coverage on these populations has also been investigated. Generalized Additive Models were used to explore the non-linear relationship between climatic and temporal variables with the abundance of birds. This study shows an abundance decrease of almost 75% for both bird species over the last 20 years and a significant positive effect of rain on the abundance of the Thorn-tailed Rayadito. This abundance decrease is potentially due to the increased abundance of newly introduced predators on Navarino Island, such as the American Mink (Neovison vison), which can be a concrete danger for these passerine populations. Understanding the populations dynamics of passerine birds over the last years and the influence of climatic variables may help to build protection plans for the species threatened by climate change. Cape Horn Passerine birds Chile Population abundance Climate change Biodiversity Dewey 590 Biology 44 Département de génétique et évolution 162 false 828 Groupe Currat 682 Laboratory of Anthropology, Genetics and Peopling history (AGP) 1056 Unité d'anthropologie e5c99ca4-2882-4293-8aff-485bc8be397d Master thesis Restricted SONNO_Loris_MasterThesis-VERSIONFIN.pdf 2146488 application/pdf Private 2023-01-01 restrictedAccess Faculté des sciences / Section de biologie / Département de génétique et évolution

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Dynamics of two passerine populations in the southernmost forest of the world				2021	120	0

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Sonno, Loris Youri