A5003665014- Avian ecology and behavior
- Rangeland and Wildlife Management
- Wildlife Ecology and Conservation
- Fire effects on ecosystems
- Species Distribution and Climate Change
- Marine and fisheries research
- Fish Ecology and Management Studies
- Marine and coastal plant biology
- Ecology and Vegetation Dynamics Studies
- Isotope Analysis in Ecology
- Coastal wetland ecosystem dynamics
- Forest ecology and management
- Plant and animal studies
- Wildlife-Road Interactions and Conservation
- Archaeology and Natural History
- Animal Behavior and Reproduction
- Wildlife Conservation and Criminology Analyses
- Marine animal studies overview
- Animal Ecology and Behavior Studies
- Remote Sensing and LiDAR Applications
- Botany, Ecology, and Taxonomy Studies
- Forest Management and Policy
- Transport and Economic Policies
- Animal Nutrition and Physiology
- Tropical and Extratropical Cyclones Research
William & Mary
2016-2025
Williams (United States)
2012-2025
Sandia National Laboratories
2024
Society for Conservation Biology
2022
Virginia Commonwealth University
2011-2021
Rural Development Agency
2020
Weyerhaeuser (United States)
2011
University of Guelph
1999
University of Georgia
1990-1996
TODD KATZNER,1,2,26 BRIAN W. SMITH,3 TRICIA A. MILLER,4,5 DAVID BRANDES,6 JEFF COOPER,7 MICHAEL LANZONE,5,8 DANIEL BRAUNING,9 CHRISTOPHER FARMER,10 SERGIO HARDING,11 E. KRAMAR,12 CRAIG KOPPIE,13 CHARLES MAISONNEUVE,14 MARK MARTELL,15 ELIZABETH K. MOJICA,16 CHARLIE TODD,17 JUNIOR TREMBLAY,18 MARIA WHEELER,19 F. BRINKER,20 TONY CHUBBS,21 ROLF GUBLER,22 KIERAN O’MALLEY,23 SCOTT MEHUS,24 BRADY PORTER,19 ROBERT P. BROOKS,4 BRYAN D. WATTS,16 AND KEITH L. BILDSTEIN25
Abstract Aim Animal movement is an important determinant of individual survival, population dynamics and ecosystem structure function. Nonetheless, it still unclear how local movements are related to resource availability the spatial arrangement resources. Using resident bird species migratory outside period, we examined distribution resources affects patterns both large terrestrial birds (e.g., raptors, bustards hornbills) waterbirds cranes, storks, ducks, geese flamingos). Location Global....
Habitat segregation is a common phenomenon among migratory songbirds during the non-breeding periods of their life cycles, and conservation practices that fail to account for sex or age-based can be ineffective. We evaluated whether occurred wintering Passerculus sandwichensis princeps (Ipswich Sparrow) latitudinally by capturing birds throughout winter range at patch level radio-tracking subset Ipswich Sparrows on Assateague Island, MD. While age ratios remained similar range, habitat use...
Abstract Survey data on species in the nightjar family (Caprimulgidae) suggest declines population abundance across their range. State and federal migratory bird managers identified need to monitor status of nightjars including common nighthawk ( Chordeiles minor ), chuck‐will's‐widow Antrostomus carolinensis eastern whip‐poor‐will A. vociferus ) United States (U.S.) portion Atlantic Flyway as a high priority need. Previous research has determined appropriate conditions for nightjar‐specific...
Winter sparrow assemblages represent ideal systems for the investigation of mechanisms that act to structure terrestrial communities.Early investigations these centered on availability food as a primary structuring mechanism (Fretwell 1972, Pulliam and Enders 1971, 1975).Groups sympatric sparrows differed in their abilities exploit seeds varying sizes were thought partition available by size.These led construction idealized intake-maximization models that, along with distribution seeds, used...
Abstract We conducted annual aerial surveys throughout the tidal reach of Chesapeake Bay, USA, between 1977 and 2001 to estimate population size reproductive performance for bald eagles ( Haliaeetus leucocephalus ). The increased exponentially from 73 601 pairs with an average doubling time 8.2 years. Annual increase was highly variable exhibited no indication any systematic decline. A total 7,590 chicks were produced 5,685 breeding attempts during this period. has tremendous forward...
Emergent tidal marshes are a dominant feature of the Chesapeake Bay’s estuarine environment and account for an approximate 123,100 ha 185,870 (66%) classified wetlands. Tidal vary in salinity, structure, plant composition according to their geographic position Bay. Bay support breeding bird populations that regional or national conservation significance. Marsh communities with marsh type, position, patch size, landscape context. loss has been significant over past two hundred years primarily...
Chesapeake Bay, in the northeastern United States, is believed to support largest concentration of breeding Ospreys (Pandion haliaetus) world. Following banning DDT, this population exhibited significant spatial variation growth rates, with fastest and slowest rates occurring lowest highest salinity areas, respectively. Because can influence fish distributions, we quantitatively analyzed Osprey diet composition along gradient Bay determine if foraging ecology contributed pattern recovery. We...
The Canadian geotechnical engineering community has completed a major collaborative 5 year research project entitled the Liquefaction Experiment (CANLEX). main objective of was to study phenomenon soil liquefaction, which can occur in saturated sandy soils and is characterized by large loss strength or stiffness resulting substantial deformations. intent this paper compare, interpret, summarize amount field laboratory data obtained for six sites Western Canada as part CANLEX project. are...
We examined patterns in the use of landfills (rubbish dumps) Chesapeake Bay by Bald Eagles (Haliaeetus leucocephalus). Sites solid waste (n = 72) were located using state databases. Satellite tracking data from 64 eagles used to track eagle movements hourly during daylight and once at midnight determine roosting locations (2007–2012). Landfill varied significantly with age class, hatch-year birds six times more often than adults twice as third- fourth-year birds. Hatch-year spent time...
Over the past one hundred years, dramatic changes have taken place in populations of colonial-nesting seabirds that breed within Chesapeake Bay and Maryland-Virginia coastal region. Populations species were decimated by extensive market hunting late nineteenth century recovered, additional colonized region ten years many declined. During 2003, over 72,000 pairs thirteen bred Breeding population sizes are presented trends evaluated based on benchmark census information from 1977 regional...
A total of 23 peregrine falcon (Falco peregrinus) eggs were obtained between 1993 and 2002 from 13 nests, encompassing 11 locations in the Chesapeake Bay region, U.S.A. When multiple available same clutch, average clutch contaminant concentrations calculated. An overall median polybrominated diphenyl ether (PBDE) level 201 ng/g wet weight was determined for eggs/clutches examined. The maximum an individual egg, urban highway bridge site, 354 ng/g. This egg also exhibited highest BDE 209...
ABSTRACT Weekly counts of western Atlantic red knots ( Calidris canutus rufa ) at their Delaware Bay migration stopover site have suggested a major decline since the 1980s. We estimated knot spring passage population size in New Jersey Coast‐Delaware region (DENJ; 2004 and 2006) Virginia (VA; 2006 2007), USA, by correcting weekly aerial for mean daily residence probability between Monte‐Carlo simulation. used telemetry relocations mark‐resight models to estimate probability. Average was...
Between 1975 and 1985, 307 captive-reared Peregrine Falcons (Falco peregrinus) of mixed heritage were released within the mid-Atlantic Coastal Plain, a physiographic region with no historical breeding population, as part eastern peregrine recovery program. We have monitored size, distribution, reproductive rate, substrate use resulting population (1979–2007). The proceeded through an establishment phase (1979–1985) driven by releases average doubling time 1.3 yr to consolidation (1986–2007)...
ABSTRACT Understanding variation in the detectability of birds is fundamental to determining reliability survey methods. We examined influence lunar light conditions on detection probability Whip-poor-wills through repeated sampling 78 point count stations over two cycles. The was positively related moonlight intensity measured as percentage moon-face illuminated and moon height above horizon. These results were used show how long-term monitoring strategies can be improved by design. Surveys...