Long-term history of vehicle collisions on the endangered Nēnē (Branta sandvicensis)

PloS One
Christopher A LepczykDavid C Duffy

Abstract

Millions of birds in the United States die annually due to vehicle collisions on roads. Collisions may be of particular interest for species of conservation concern, such as the endangered Hawaiian goose (Nēnē), which is endemic to Hawai'i. Using a nearly 40-year dataset of Nēnē road mortality in and around Hawai'i Volcanoes National Park, we sought to answer the following research questions: 1) has Nēnē mortality changed over time? 2) are there times of the year in which mortality is greatest and does it relate to specific events in the species' lifecycle? 3) does age at mortality differ over time, space, or sex? 4) given that existing mortalities appear to occur only in certain locations, do the number of mortality events differ across these locations; 5) does mortality rate show any density dependence? and, 6) are mortality rates related to numbers of visitors or vehicles? Between 1977 and 2014, a total of 92 Nēnē died from vehicle collisions; while absolute mortality increased over this time, the mortality rate remained the same. Similarly, average age of mortality increased over time, but did not differ by location or sex. Between 1995 and 2014, Nēnē population size and mortality rates were not correlated. Mortality was gr...Continue Reading

References

Feb 3, 2011·Conservation Biology : the Journal of the Society for Conservation Biology·A V KociolekD S Proppe
Jan 31, 2013·Nature Communications·Scott R LossPeter P Marra
Jun 26, 2015·BJOG : an International Journal of Obstetrics and Gynaecology·L HuiJ L Halliday
Jul 15, 2015·Journal of Wildlife Diseases·Thierry M WorkRenee Breeden
Nov 22, 2016·PloS One·Trina RytwinskiEdgar A van der Grift

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