Author: Erin M. O'Brien Publisher: ISBN: Category : Loggerhead shrike Languages : en Pages : 96
Book Description
I observed 1372 hunting attempts by Loggerhead shrikes, with trees (36.9%) and fences (34.9%) the most commonly used perches and arthropods (65.3%) and other invertebrates (23.3%) the most common prey. Vegetation analysis revealed the characteristics of used and apparently unused perches were significantly different (P
Author: Nicholas Ryan Peterson Publisher: ISBN: Category : Loggerhead shrike Languages : en Pages : 118
Book Description
Loggerhead Shrikes (Lanius ludovicianus) have been declining in the United States since the 1960s, and in Kentucky they declined by 9.6% from 1980-2003. Suggested causes for their decline include eggshell thinning due to DDT exposure, loss of suitable habitat, low reproductive success, and competition with exotic species in parts of their range. None of these, however, have provided a definitive reason for the decline. The objective of my study was to examine the reproductive success of Loggerhead Shrikes in central Kentucky and to determine the possible effect of habitat availability and suitability on the abundance and reproductive success of Loggerhead Shrikes. Shrikes were studied from 15 March-30 September 2005 in Madison and Garrard counties, Kentucky, and breeding adults were fitted with radio transmitters so that I could measure their territory sizes. Additionally, I measured nest-level and territory-level habitat characteristics and I also monitored active nests to assess reproductive success. Lastly, hunting behaviors and habitats were recorded. Mean territory (N = 12) size was 9.0 ha and nests (N = 18) were most often located in Eastern red cedar, Osage orange, and multiflora rose. Nest-level habitat characteristics of used and unused sites differed, with the percentage of bare ground and vegetation height within 10 m of nests being the best discriminating variables between such sites. there were no differences between the habitat characteristics of successful and unsuccessful nests, or between used and unused territories. Shrikes most often caught prey that were identified as arthopods and usually hunted from linear man-made structures such as fencelines and utility wires. Reproductive success was low in my study, with 50% of nests failing and only 42.8% of eggs resulting in fledglings. The availability of suitable breeding habitat does not appear to be a limiting factor in central Kentucky Loggerhead Shrikes populations, though low reproductive success prior to fledging may be a limiting factor. Low reproductive success of Loggerhead Shrikes in central Kentucky may be a result of recent increases in local avian and mammalian predators. Loggerhead Shrike management should focus on ensuring that nesting habitat is available in habitats that are not foraging corridors for mammalian predators (i.e., non-linear habitats), and Shrikes may also benefit from a hand-rearing program that increases the yearly production of young.
Author: William C. Olson (M.S.) Publisher: ISBN: Category : Bird populations Languages : en Pages : 54
Book Description
The characteristics of shrike nest sites, territories, and hunting perches were analyzed and compared to those of apparently suitable, but unoccupied sites and areas and unused perches. Multivariate analysis revealed no significant differences between used and unused nest sites, territories, and perches (P > 0.19), suggesting that availability of suitable breeding and foraging habitat is likely not contributing to the decline of Loggerhead Shrike populations in central Kentucky. Additional information is needed concerning adult and fledgling mortality, prey abundance, and winter habitat use to provide further insight into factors contributing to the decline in populations of Loggerhead Shrikes.
Author: E. S. Telfer Publisher: ISBN: Category : Loggerhead shrike Languages : en Pages : 4
Book Description
The loggerhead shrike (Lanius ludovicianus) is a robin-sized bird that hunts like a small hawk, preying on insects and small animals, including small birds. This document presents a description of the species and provides information on habitat and habits, range, feeding, breeding, and conservation measures.
Author: Emily Rose Donahue Publisher: ISBN: Category : Loggerhead shrike Languages : en Pages : 92
Book Description
As intensive agriculture has transformed much of the landscape across central North America, many grassland species have had to learn to adjust these new, highly homogeneous habitats while facing steep population declines. The Loggerhead Shrike (Lanius ludovicianus; hereinafter shrike) is one such declining species that persists in these agricultural landscapes. However, we lack information on the sustainability of these populations, and shrike non-breeding ecology, as for most passerines, remains understudied. Specifically, little is known about non-breeding behavior, diet, survival, site fidelity, and habitat selection. If survival, space use, and habitat selection metrics differ between demographic groups within non-breeding populations also remains unknown. To fill these gaps, we conducted behavioral and diet surveys and banded and monitored shrikes in NE Arkansas from 2016-2019. Our efforts give insights into the foraging strategies and winter requirements of LOSH while investigating demographic partitioning and potential consequences in a partial migrant species.
Author: Wayne Irvin Publisher: ISBN: Category : Loggerhead shrike Languages : en Pages : 0
Book Description
Information sheet with physical description, conservation status, habitat, habits and human interactions with the loggerhead shrike (Lanius ludovicianus).
Author: Erin M. O'Brien
Author: Nicholas Ryan Peterson
Author: William C. Olson (M.S.)
Author: E. S. Telfer
Author: Mark D. Howery
Author: Helen M. Hands
Author: Paul Gary Novak
Author: Emily Rose Donahue
Author: Wayne Irvin
Author: Sheryl Lynn Hellman