نتایج جستجو برای: 2005 home ranges movements
تعداد نتایج: 395952 فیلتر نتایج به سال:
4 The kernel estimation and the utilization distribution 14 4.1 The utilization distribution . . . . . . . . . . . . . . . . . . . . . 14 4.2 The function kernelUD: estimating the utilization distribution . . 17 4.3 The Least Square Cross Validation . . . . . . . . . . . . . . . . . 18 4.4 Controlling the grid . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.4.1 Passing a numeric value . ...
Although species with large area requirements are sometimes used as umbrella species, their general utility as conservation tools is uncertain. We surveyed the species diversity of birds, butterflies, carabids, and forest-floor plants in forest sites across an area (1,600 km2) in which we delineated large breeding home ranges of Northern Goshawk (Accipiter gentilis). We tested whether protectio...
Home range analysis is a standard and fundamental concept in ecology used to describe animal space use over their lifetimes. Connecting home sizes with characteristics, location, habitat can be inform conservation decisions. Reptiles are frequently lacking robust estimates of use, particularly reptiles tropical regions. Here we analyse publicly available dataset, collected by the authors this s...
Migration is an important component of the life history of many animals, but persistence of large-scale terrestrial migrations is being challenged by environmental changes that fragment habitats and create obstacles to animal movements. In northern Alaska, the Central Arctic herd (CAH) of barren-ground caribou (Rangifer tarandus granti) is known to migrate over large distances, but the herd's s...
We compared home ranges of introduced Abert’s squirrels (Sciurus aberti Woodhouse, 1853) in mixedconifer forests of Arizona during non-mating and mating seasons. Because Abert’s squirrels are reported to depend on ponderosa pine (Pinus ponderosa P. & C. Lawson) forests, the mixed-conifer forest in our study represented a novel habitat. Home-range size, home-range overlap with females, and movem...
An emerging issue in wildlife conservation is the re-establishment of viable populations of endangered species in suitable habitats. Here, we studied habitat selection by a population of Hainan Eld's deer (Cervus eldi) relocated to a patchy landscape of farmland and forest. Hainan Eld's deer were pushed to the brink of extinction in the 1970s, but their population expanded rapidly from 26 to mo...
Female dark-eyed juncos (Junco hyemalis) are socially monogamous, but they engage in extra-pair copulations (EPCs). We examined spatial activity and behavior of female juncos during their fertile period to determine whether they engaged in tactics likely to facilitate EPCs and whether any such tactics varied with the attractiveness of their social mates. We manipulated the attractiveness of soc...
The concept of home ranges is fundamental to ecology. Numerous studies have quantified how home ranges scale with body size across taxa. However, these relationships are not always applicable intraspecifically. Here, we describe how the home range of an important group of reef fish, the parrotfishes, scales with body mass. With masses spanning five orders of magnitude, from the early postsettle...
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