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Aerial surveys cause large but ephemeral decreases in bear presence at salmon streams in Kodiak, Alaska — Europe PMC PMID:31504063

Source: Europe PMC (en)
Original: https://europepmc.org/article/MED/31504063
DOI: 10.1371/journal.pone.0222085
License (as archived): CC0-1.0
Archived: 2026-11-10T16:19:20.091Z
SHA-256 of the archived text: 916e56af1ab5ce10a3d7e20ad9679fd7e3d199d3b0ec6eb5b8e5bdb9322de181
Stable URL of this page: https://metraipolis.com/documento/dc_216ca561e8a7

How to cite

Aerial surveys cause large but ephemeral decreases in bear presence at salmon streams in Kodiak, Alaska — Europe PMC PMID:31504063 — Europe PMC (en), https://europepmc.org/article/MED/31504063 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_216ca561e8a7 (Metraipolis archive dc_216ca561e8a7, sha256 916e56af1ab5ce10a3d7e20ad9679fd7e3d199d3b0ec6eb5b8e5bdb9322de181)

BibTeX

@misc{dc216ca561e8a7,
  title = {Aerial surveys cause large but ephemeral decreases in bear presence at salmon streams in Kodiak, Alaska — Europe PMC PMID:31504063},
  howpublished = {Europe PMC (en)},
  url = {https://europepmc.org/article/MED/31504063},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_216ca561e8a7; sha256 916e56af1ab5ce10a3d7e20ad9679fd7e3d199d3b0ec6eb5b8e5bdb9322de181},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: Europe PMC (en), https://europepmc.org/article/MED/31504063. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

Aerial surveys are often used to monitor wildlife and fish populations, but rarely are the effects on animal behavior documented. For over 30 years, the Kodiak National Wildlife Refuge has conducted low-altitude aerial surveys to assess Kodiak brown bear (Ursus arctos middendorffi) space use and demographic composition when bears are seasonally congregated near salmon spawning streams in southwestern Kodiak Island, Alaska. Salmon (Oncorhynchus spp.) are an important bear food and salmon runs are brief, so decreases in time spent fishing for salmon may reduce salmon consumption by bears. The goal of this study was to apply different and complementary field methods to evaluate the response of bears to these aerial surveys. Ground-based counts at one stream indicated 62% of bears departed the 200m-wide survey zone in response to aerial surveys, but bear counts returned to pre-survey abundance after only three hours. Although this effect was brief, survey flights occurred during the hours of peak daily bear activity (morning and evening), so the three-hour disruption appeared to result in a 25% decline in cumulative daily detections by 38 time-lapse cameras deployed along 10 salmon streams. Bear responses varied by sex-male bears were much more likely than female bears (with or without cubs) to depart streams and female bears with GPS collars did not move from streams following surveys. Although bears displaced by aerial surveys may consume fewer salmon, the actual effect on their fitness depends on whether they compensate by foraging at other times or by switching to other nutritious resources. Data from complementary sources allows managers to more robustly understand the impacts of surveys and whether their benefits are justified. Similar assessments should be made on alternative techniques such as Unmanned Aerial Vehicles and non-invasive sampling to determine whether they supply equivalent data while limiting bear disturbance.

Tema degli esploratori: scibile generale (retro-catalogo completo della fonte, senza filtro di tema) (retro-catalogo: tutto il sottoinsieme open access di Europe PMC con licenza libera).
Pubblicazione: PloS one, 2019 (prima pubblicazione 2019-09-10).
Identificativi: PMID 31504063 · PMCID PMC6736237 · DOI 10.1371/journal.pone.0222085.
Descrittori MeSH principali: Ecosystem; Animal Distribution.
Pagina: https://europepmc.org/article/MED/31504063 — https://doi.org/10.1371/journal.pone.0222085. Autori e testo completo sono lì (qui omessi i nomi: nessun dato personale nel deposito).
Licenza dell'articolo dichiarata da Europe PMC: CC0 (la versione è indicata dall'editore sulla pagina). Abstract riportato senza modifiche al contenuto, con attribuzione; deposito marcato CC0.
Letto il 2026-11-10T16:16:41.113Z tramite l'API REST ufficiale di Europe PMC (EMBL-EBI), nel rispetto del robots.txt e del crawl-delay.