Habitat Guild Drives Variation in Apparent Survival of Landbirds in the Great Plains
نویسندگان
چکیده
—Many species of songbirds in the United States have shown widespread declines in population numbers during the last five decades. To understand ongoing declines and plan for conservation, researchers need reliable estimates of adult survival and site fidelity. However, variation in adult survival and site fidelity within and among species is substantial and could have consequences for management. Estimates of adult survival are lacking for many bird species and ecoregions, including the Great Plains. In this field study, we used Cormack-Jolly-Seber mark-recapture models to analyze encounter histories of 17 species of birds captured with a 13-year systematic mist-netting effort in northeast Kansas. We estimated annual rates of apparent adult survival (/) and corrected for the probability of capture (p), and tested for effects of sex and breeding habitat guild. We present the first estimates of apparent survival for six species of songbirds, and the first estimates from the Great Plains for 13 species. Apparent survival tended to be higher for males than for females, and we found a sex effect on the probability of capture for one species. Unexpectedly, grasslandand shrubland-breeding species had higher estimates of apparent survival than forest-breeding species. Our results did not support the prevailing viewpoint that birds breeding in dynamic landscapes, such as frequently burned grasslands, should show lower apparent survival than species that breed in woody habitats. We demonstrate that habitat plays an important role in the survival and site fidelity of songbirds, and that regional differences in habitat structure could drive variation in demography. Understanding the drivers of true survival and site fidelity of songbirds will allow region-specific management for species of conservation concern. Received 7 February 2016. Accepted 24 July 2016.
منابع مشابه
Colonization and extinction in dynamic habitats: an occupancy approach for a Great Plains stream fish assemblage.
Despite the importance of habitat in determining species distribution and persistence, habitat dynamics are rarely modeled in studies of metapopulations. We used an integrated habitat-occupancy model to simultaneously quantify habitat change, site fidelity, and local colonization and extinction rates for larvae of a suite of Great Plains stream fishes in the Arikaree River, eastern Colorado, US...
متن کاملA comparison of linear transect and capture recapture methods results in Iranian Jerboa population density and abundance estimation in Mirabad plains, Shahreza
During a period from spring 2008 till fall 2010, Iranian Jerboa population abundance was estimated using distance (linear transect) and capture-recapture methods in the Mirabad plains near Shahreza city in Isfahan Province. In the study period, during the active time of the species except reproduction time, we tried to live-trap, mark, release and recapture individuals based on Schnabel method ...
متن کاملبررسی ترجیح زیستگاهی و اندازه گروههای جبیر (Gazella bennettii) در پناهگاه حیات وحش دره انجیر یزد
Chinkara is classified as a vulnerable species (IUCN, 2009). Yet, there is a little information on its biological characteristics and habitat in Iran. This study focuses on the habitat preference and social pattern of this species in Dareh-Anjeer wildlife refuge in 2010-2011. We first determined habitat boundaries of Chinkara in the area. During the survey, 15 transects were located within diff...
متن کاملA Comparison of Shrub-dominated and Forested Habitat Use by Spring Migrating Landbirds in Northeastern Pennsylvania
Long-term datasets reveal declines in many populations of landbird migrants, with declines especially evident in shrub-nesting species. Moreover, transitional shrub-dominated habitats are becoming scarce, reducing breeding habitat for these species. Because migrants often occupy habitats en route similar to those used in the breeding season, the persistence of shrub-dominated habitats may be es...
متن کامل