A5074777020- Avian ecology and behavior
- Wildlife Ecology and Conservation
- Animal Ecology and Behavior Studies
- Species Distribution and Climate Change
- Rangeland and Wildlife Management
- Fire effects on ecosystems
- Ecology and Vegetation Dynamics Studies
- Forest ecology and management
- Wildlife Conservation and Criminology Analyses
- Bird parasitology and diseases
- Turtle Biology and Conservation
- Genetic diversity and population structure
- Bat Biology and Ecology Studies
- Veterinary Pharmacology and Anesthesia
- Economic and Environmental Valuation
- Marine Bivalve and Aquaculture Studies
- Ocean Acidification Effects and Responses
- Mosquito-borne diseases and control
- Pacific and Southeast Asian Studies
- Plant and animal studies
- Human-Animal Interaction Studies
- Environmental Conservation and Management
- Remote Sensing and LiDAR Applications
- Conservation, Biodiversity, and Resource Management
- Wildlife-Road Interactions and Conservation
American Bird Conservancy
2009-2023
The Nature Conservancy
2021
Charles Darwin Foundation
2004-2016
Dalton State College
2007
Charles Darwin University
2006
Houston Museum of Natural Science
1996
Louisiana State University
1996
Florida State University
1991
World governments have committed to halting human-induced extinctions and safeguarding important sites for biodiversity by 2020, but the financial costs of meeting these targets are largely unknown. We estimate cost reducing extinction risk all globally threatened bird species (by ≥1 International Union Conservation Nature Red List category) be U.S. $0.875 $1.23 billion annually over next decade, which 12% is currently funded. Incorporating nonavian increases this total $3.41 $4.76 annually....
Abstract: Grassland fragmentation and habitat loss are hypothesized to be contributing widespread grassland bird declines in North America due the adverse effects of on breeding abundance reproductive success. To assess success birds, we measured rates nest predation brood parasitism for four species birds ( Grasshopper Sparrow [ Ammodramus savannaru ], Henslow's Sparrow[ henslowii Eastern Meadowlark Sturnella magna Dickcissel Spiza Americana ] ) 39 prairie fragments ranging from 24...
Some conservation prioritization methods are based on the assumption that needs overwhelm current resources and not all species can be conserved; therefore, a triage scheme (i.e., when system is overwhelmed, should divided into three groups likelihood of survival, efforts focused those in group with best survival prospects reduced or denied to no needing special for their conservation) necessary guide resource allocation. We argue this decision-making strategy appropriate because as limited...
Although there is strong evidence that a few Neotropical migrant land birds have severely declining populations, we know of no general overall declines. One widely cited analysis data from the Breeding Bird Survey (BBS), only continental—scale monitoring program for in breeding season, indicates populations eastern forests 1980s, but other analyses conclude most species had stable or increasing last 25 yr. These conflicting results call new perspective. Here, propose two approaches to BBS...
Abstract For migratory species, seasonal movements complicate local climate adaptation, as it is unclear whether individuals track niches across the annual cycle. In songbird yellow warbler ( Setophaga petechia ), we find a correlation between individual‐level wintering and breeding precipitation, but not temperature. Birds in driest regions of Neotropics breed North America. Individuals from drier also possess distinct morphologies population responses to varying rainfall. We positive...
The avifauna of the Galapagos islands is characterized by a small number endemic species, including 13 species Darwin's finches. introduced fly parasite Philornis downsi reduces nestling survival and growth rate altricial birds, can cause mortality morbidity nestlings. We examined occurrence among at different elevations. was found in nests from 11 sampled. two on which P. not were Espa�ola Genovesa, both arid with no humid highlands distant centre archipelago. Parasite infection intensity...
Introduction: Threats that affect the avian diversity on Galápagos Islands are increasing. We evaluated threats such as climate change and severe weather, human intrusions disturbance, biological resource use, invasive other problematic species, genes diseases, pollution, geological events loss of genetic in relation with species enlisted both international national (Ecuador) IUCN Red List, which can be used sentinel ecosystem. Here, status threatened for next ten years (present time up to...
Accurate maps of species ranges are essential to inform conservation, but time-consuming produce and update. Given the pace change knowledge about distributions shifts in under climate land use, a need exists for timely mapping approaches that enable batch processing employing widely available data. We develop systematic approach batch-processing range derived Area Habitat terrestrial bird with published below 125,000 km 2 Central South America. (Area is habitat within its range.) combine...
Although the Galapagos avifauna has been described previously, it is necessary to list, clarify, and update previously published records of birds occurring in archipelago, clarify some recent that are erroneous or were presented with none few details. The list breeding (including endemic species subspecies non-endemic species) regular migrant totals only 88 species, although including 57 vagrant number 145 species. However, endemism quite high, half (50%) being at level. If land considered,...
As a result of recurrent droughts and anthropogenic factors, the range lesser prairie-chicken (Tympanuchus pallidicinctus) has contracted by 92% population been reduced approximately 97% in past century, resulting smallest size most restricted geographical distribution any North American grouse. We examined genetic variation through DNA sequence analysis 478 base pairs mitochondrial genome assaying allelic at five microsatellite loci from prairie-chickens collected on 20 leks western...
Morphological measurements were taken on study skins of breeding Yellow Warbler (Dendroica petechia) males collected from near the Arctic Circle to Equator. The data smoothed using LOESS (a non-linear, non-parametric scatterplot smoother), elucidate patterns geographic variation. Individuals are generally larger in south than north, although birds Caribbean region show reverse trend. Wing length follows overall size trend poorly. Proportionate wing is much shorter and more rounded...
Se estudió el estado actual de las poblaciones tortugas terrestres gigantes (Geochelone) en islas Galápagos. Métodos distribución geográfica, marca-recaptura, estructura, densidad, relación sexo, depredación y amenazas, son usados contexto del estudio. Resultados registros antiguos indican que la demografía poblacional está muy por debajo existió los siglos XVI-XVIII fue diferente entre 1974 1992-2002. La es similar a estimada MacFarland. Demografías poblacionales actuales diferentes 1974....
From 14 June to 5 July 1979 we studied the avifauna at two localities in Depto. Tumbes, Peru, near Ecuadorean border. We obtained specimens of six species and 1 subspecies new for collected natural history information on such poorly known taxa as Ortalis erythroptera, Synallaxis tithys, Automolus erythrocephalus, Thamnophilus zarumae. RESUMEN. Entre el de junio y julio estudiamos la dos localidades cercanas a frontera con Ecuador en Departamento Peru. Obtuvimos especimenes seis especies...
Abstract Although the killing of giant tortoises in Galapagos Islands has been prohibited since 1933, poaching still occurs. Personnel National Park Service and Charles Darwin Research Station regularly survey populations throughout archipelago report all dead found. For 10-year period 1995–2004 field personnel reported evidence 190 killed, primarily on southern portion Isabela Island. first 6 years number found killed was <15 per year, but 2001 increased dramatically, with 49 poached...
Summary The Galapagos Petrel Pterodroma phaeopygia is endemic to the Archipelago, where it nests on only five islands. species considered ‘Critically Endangered’, mostly due effects of alien invasive species, which impair its reproductive success. During 2002–2003 we studied breeding biology petrels nesting San Cristóbal island. study revealed particular characteristics petrel population and differences compared those other islands, related habitat, phenology, success causes mortality. On...