Acoustic Monitoring Provides First Records of Hoary Bats (Lasiurus cinereus) and Delineates the Distribution of Silver-Haired Bats (Lasionycteris noctivagans) in Southeast Alaska
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2014
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| author | Blejwas, Karen M Lausen, Cori L Rhea-Fournier, Dylan |
| author_facet | Blejwas, Karen M Lausen, Cori L Rhea-Fournier, Dylan |
| contents | (Uploaded by Plazi for the Bat Literature Project) Although 5 species of bats have been documented in Southeast Alaska, informa on species not of the genus Myotis is derived solely from 4 specimens of the Silver-haired (Lasionycteris noctivagans). We acoustically monitored for bat species that produce low freque echolocation calls (<30 kHz minimum frequency), specifically Hoary Bat ( Lasiurus cinere Silver-haired Bat, and Big Brown Bat ( Eptesicus fuscus) at 40 sites in 16 locations across South Alaska from 2011 to 2013 using passive bat detectors. The Hoary Bat was not previously kno from Alaska, but we recorded 25 call files of this species (of 26,151 low frequency bat files) sites in northern Southeast Alaska (4 mainland sites and 1 site on Chichagof Island); an addit 110 call files were classified as probable Hoary Bat, but were ambiguous. We recorded 307 files that contained echolocation calls diagnostic of Silver-haired Bats; no files had character diagnostic of Big Brown Bats. The rest of the low frequency recordings were identified probable Silver-haired Bat calls, although Big Brown Bats cannot be ruled out due to extensive overlap of acoustic characteristics between these 2 species. We recorded Hoary almost exclusively during the autumn migration period. By contrast, Silver-haired Bats w detected throughout the summer active season, indicating at least some individuals are resid in Southeast Alaska. Silver-haired Bat activity was greatest at sites on or near the mainland, w most sites showing peaks of activity in spring, suggesting bats from the interior ma overwintering in the region. Winter recordings suggest Silver-haired Bats (and Big Brown Ba present) are active to some extent during winter in Southeast Alaska. Understanding distribution and seasonality of Hoary and Silver-haired Bat activity in Southeast Alaska critical 1st step toward identifying their habitat requirements and conservation needs in region. |
| format | Recurso digital |
| id | zenodo_https___doi_org_10_5281_zenodo_13418804 |
| institution | Zenodo |
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| publishDate | 2014 |
| publisher | Zenodo |
| record_format | zenodo |
| spellingShingle | Acoustic Monitoring Provides First Records of Hoary Bats (Lasiurus cinereus) and Delineates the Distribution of Silver-Haired Bats (Lasionycteris noctivagans) in Southeast Alaska Blejwas, Karen M Lausen, Cori L Rhea-Fournier, Dylan Biodiversity Mammalia Chiroptera Chordata Animalia bats bat (Uploaded by Plazi for the Bat Literature Project) Although 5 species of bats have been documented in Southeast Alaska, informa on species not of the genus Myotis is derived solely from 4 specimens of the Silver-haired (Lasionycteris noctivagans). We acoustically monitored for bat species that produce low freque echolocation calls (<30 kHz minimum frequency), specifically Hoary Bat ( Lasiurus cinere Silver-haired Bat, and Big Brown Bat ( Eptesicus fuscus) at 40 sites in 16 locations across South Alaska from 2011 to 2013 using passive bat detectors. The Hoary Bat was not previously kno from Alaska, but we recorded 25 call files of this species (of 26,151 low frequency bat files) sites in northern Southeast Alaska (4 mainland sites and 1 site on Chichagof Island); an addit 110 call files were classified as probable Hoary Bat, but were ambiguous. We recorded 307 files that contained echolocation calls diagnostic of Silver-haired Bats; no files had character diagnostic of Big Brown Bats. The rest of the low frequency recordings were identified probable Silver-haired Bat calls, although Big Brown Bats cannot be ruled out due to extensive overlap of acoustic characteristics between these 2 species. We recorded Hoary almost exclusively during the autumn migration period. By contrast, Silver-haired Bats w detected throughout the summer active season, indicating at least some individuals are resid in Southeast Alaska. Silver-haired Bat activity was greatest at sites on or near the mainland, w most sites showing peaks of activity in spring, suggesting bats from the interior ma overwintering in the region. Winter recordings suggest Silver-haired Bats (and Big Brown Ba present) are active to some extent during winter in Southeast Alaska. Understanding distribution and seasonality of Hoary and Silver-haired Bat activity in Southeast Alaska critical 1st step toward identifying their habitat requirements and conservation needs in region. |
| title | Acoustic Monitoring Provides First Records of Hoary Bats (Lasiurus cinereus) and Delineates the Distribution of Silver-Haired Bats (Lasionycteris noctivagans) in Southeast Alaska |
| topic | Biodiversity Mammalia Chiroptera Chordata Animalia bats bat |
| url | https://doi.org/10.5281/zenodo.13418804 |