Shrub-dwelling species are joining the Arctic passerine bird community in the Chaun Delta (Western Chukotka, Russia)

Fire disturbance promotes biodiversity of plants, lichens and birds in the Siberian subarctic tundra

“…We found that the proportion of southern (taiga) bird species is highest in the oldest fire scar, mirroring the increase in shrub cover (confirming anticipated outcome 3: the proportion of southern [taiga] bird species is highest on fire scars with high shrub cover). This relationship demonstrates that climate change‐related shrub expansion in tundra ecosystems (Davis et al, 2021; Kitagawa et al, 2020; Myers‐Smith et al, 2011) could indeed lead to range expansion and increased abundance of southern bird species in tundra ecosystems (Elmhagen et al, 2015; Ktitorov et al, 2021; Smith et al, 2020). However, warming‐related shifts towards more boreal species in the Arctic fauna have also been observed in seabird communities that are not related to shrub cover (Descamps & Strøm, 2021).…”

“…This relationship demonstrates that climate change-related shrub expansion in tundra ecosystems (Davis et al, 2021;Kitagawa et al, 2020;Myers-Smith et al, 2011) could indeed lead to range expansion and increased abundance of southern bird species in tundra ecosystems (Elmhagen et al, 2015;Ktitorov et al, 2021; Note: We included only species with an occurrence ≥3. Smith et al, 2020).…”

“…While Motacilla flava, a species that lives in open habitats, most commonly in lowland shrub tundra in the region (Sokolov et al, 2012), was found as an indicator species for the unburnt control, whereas indicator species for the oldest fire scar mostly consist of shrub-dwelling species with a more southern distribution, such as Phylloscopus leaf warblers and Emberiza pusilla (Sokolov et al, 2012). Shrub-dwelling songbird species increasingly join Arctic bird communities (Ktitorov et al, 2021). The indicator species for the youngest fire scar, Gallinago stenura, is known to occur in recently disturbed areas, for example, after forest clear cuts (Golovina, 1998) We did not detect significant post-fire trends in the densities of the six most abundant bird species in our study, most likely due to limited sample sizes.…”

Клоктун Sibirionetta formosa в тундре Западной Чукотки: гнездование, динамика встречаемости и современное распространение

“…чаун -пучевеем рекордным по количеству встреченных клоктунов стал 2021 г.: частота регистраций составила 18 % от общего времени наблюдений за сезон, индекс й на этих территориях. удлинение вегетационного периода способствует быстрому расселению кустарников в тундре, включая Западную чукотку (Ktitorov et al, 2021), а кустарники являются предпочитаемым гнездовым биотопом клоктуна.…”