A5069132413- Avian ecology and behavior
- Wildlife Ecology and Conservation
- Ecology and Vegetation Dynamics Studies
- Species Distribution and Climate Change
- Plant and animal studies
- Animal Behavior and Reproduction
- Primate Behavior and Ecology
- Fire effects on ecosystems
- Rangeland and Wildlife Management
- Animal Ecology and Behavior Studies
- Genetic diversity and population structure
- Bird parasitology and diseases
- Bat Biology and Ecology Studies
- Animal Vocal Communication and Behavior
- Marine animal studies overview
- Wildlife-Road Interactions and Conservation
- Amphibian and Reptile Biology
- Isotope Analysis in Ecology
- Evolution and Paleontology Studies
- Vector-borne infectious diseases
- Wildlife Conservation and Criminology Analyses
- Fish Ecology and Management Studies
- Zoonotic diseases and public health
- Botany, Ecology, and Taxonomy Studies
- Radio Wave Propagation Studies
University of Florida
2015-2024
Universidad San Francisco de Quito
2021-2024
University of Missouri–St. Louis
2006-2016
University of Missouri
2009-2010
Universidad de las Fuerzas Armadas ESPE
2007
University of Minnesota
1996
Twin Cities Orthopedics
1996
University of Minnesota, Duluth
1990-1994
University of Wisconsin–Madison
1991
University of Illinois Urbana-Champaign
1984-1986
We studied temporal fluctuations in fruit production by plants and populations of understory fruit—eating birds at three elevations (50, 500, 1000 m) Costa Rican wet forests over a 12—16 mo period to investigate effects resource variation on bird movements community structure. used mist nets monitor changes frugivore abundance, migration patterns, breeding molting cycles. sampled fruits each forest concurrent with studies frugivores. Both frugivores exhibited considerable seasonal abundance....
We investigated breeding bird communities of isolated woodlots (1.8—600 ha) in east—central Illinois during three summers (1979—1981) to compare the influence area and habitat on community structure. Woodlots supported from 9 43 species composition was relatively constant among years. Ecological generalists dominated small woodlots, while more specialized increased importance with area. Area accounted for most variation (86—98%) total number each year species—area relationship did not change...
Abstract Aim Species distribution models and geographical information system (GIS) technologies are becoming increasingly important tools in conservation planning decision‐making. Often the rich data bases of museums herbaria serve as primary for predicting species distributions. Yet key assumptions about often untested, violation such may have consequences model predictions. For example, users assume that sampling has been random with respect to geography environmental gradients. Here we...
Abstract The occurrence of birds in forest understory and tree-fall gaps during spring fall migration periods was determined an isolated woodlot. We used mist-net captures to test the hypothesis that are attracted because higher resource levels. captured 1,010 (74 species) 458 (44 fall. Total per net were (P < 0.001) Mean number species both seasons, but total (69 spring, 43 fall) not significantly than (60 28 fall). Of 44 represented by adequate sample sizes (n > 5) 9 0.05) more...
-We examined temporal variation in abundance of understory birds and fruiting plants young (5-7 yr) old (25-35 successional habitats intact, lowland rain forest at Estacion Biologica La Selva, Costa Rica, between January 1985 May 1986. Fruit varied seasonally each habitat but was consistently greatest the youngest site. Frugivores nectarivores accounted for four (forest older successional) or five (younger most frequently captured bird species habitat. Capture rates arboreal frugivores...
Abstract Aim Migrating birds transport their parasites, often over long distances, but little is known about the transfer of these parasites to resident hosts in either wintering or breeding ranges migratory host populations. We investigated haemosporidian parasite faunas and determine connections among distant faunas, plausibly brought by Location Samples were obtained, primarily during shortly after local season, throughout Americas, from United States through Caribbean Basin into northern...
Across the globe, unprecedented declines have been reported across a range of taxa. Among most well documented are in bird populations, with attributable to human activities such as deforestation and other alterations habitats. There is increasing evidence that populations also declined at sites within large expanses relatively undisturbed lowland tropical forest, Amazonia. Causes likely varied may be related direct or indirect effects climate change. Here, we use mist-net data observations...
Second growth has replaced lowland forest in many parts of the Neotropics, providing valuable habitat for resident and migrant bird species. Given prevalence such habitats potential benefit conservation biodiversity, it is important to understand patterns diversity second old growth. Descriptions species-distribution may depend, however, on method(s) used sample birds. We data from mist nets point counts (1) describe species community composition second-growth (young old) old-growth forests...
Abstract. Distribution of bird species among isolated habitat patches (e.g., woodlots in an agricultural landscape) often appears to be nonrandom; present small, species‐poor also are found larger that support more species. Bird communities form ‘nested subsets’ (after Patterson & Atmar 1986) if all small faunas species‐rich assemblages. Occurrence a nested subset pattern implies underlying, nonrandom distributions. I used computer simulations analyze the degree nestedness exhibited by...
Variance in reproductive success among individuals is a defining characteristic of many social vertebrates. Yet, our understanding which male attributes contribute to still fragmentary most cases. Male–male coalitions, where males jointly display attract females, are particular interest evolutionary biologists because one appears forego reproduction assist the partner. By examining relationship between behaviour and success, we can elucidate proximate function coalitions context mate choice....
How social structure interacts with individual behaviour and fitness remains understudied despite its potential importance to the evolution of cooperation. Recent applications network theory advance our understanding role interactions in various contexts. Here we applied system lek-mating wire-tailed manakins (Pipra filicauda, Pipridae, Aves). We analysed among males order begin building a comparative framework understand where coordinated display lies along continuum from solitary...
Mineral licks are sites where a diverse array of mammals and birds consume soil (geophagy) or drink water, likely for mineral supplementation. The diversity species that visit such makes them important conservation, particularly given hunters often target animals at licks. Use varies among species, with frugivores the most common visitors but there is considerable temporal spatial variation in lick use both within species. Camera traps triggered by heat motion were used to document...
Bird populations have declined in many parts of the world but most those declines can be attributed to effects human activities (e.g., habitat fragmentation); areas unaffected by are not common. We been sampling bird at an undisturbed site lowland forest eastern Ecuador annually since 2001 using a combination mist nets and direct observations on two 100-ha plots. numbers fluctuated both plots during first 8 years did show consistent pattern change. Since about 2008, birds declined; capture...
Species diversity and community composition of birds change rapidly along elevational gradients in Costa Rica. Such changes are interest ecologically illustrate the value protecting continuous forest. We used mist nets point counts to sample an gradient on northeastern Caribbean slope Cordillera Central Sites included mature tropical wet forest (50 m); wet, cool transition (500 premontane rain (1,000 lower montane (1,500 2,000 m). recorded 261 species from 40 families, including 168 captured...
A major challenge in studies of habitat fragmentation is to determine the influence patch quality and landscape context on use by animals. Few have simultaneously examined effects (area, shape, vegetation structure) (e.g., amount arboreal close proximity) abundance patterns In this study, we how these characteristics bird species distribution a pasture-dominated Los Tuxtlas region Veracruz, Mexico. We focused three types elements: forest edge sites (n = 8), remnants riparian 9). quantified...
Journal Article Population Variation in a Tropical Bird Community: Implications for conservation Get access Bette A. Loiselle, Loiselle Search other works by this author on: Oxford Academic Google Scholar John G. Blake BioScience, Volume 42, Issue 11, December 1992, Pages 838–845, https://doi.org/10.2307/1312083 Published: 01 1992
Hourly variation in bird activity can influence census results but has not been well studied tropical habitats. I examined hourly numbers of birds detected during 10 min point counts a wet forest site Costa Rica. Counts started one-half hour before and continued for 4.5 hr after sunrise. were conducted along three routes (20 points each on two routes; 11 one route) primary early (January), middle (March), late (April) dry season 1991, prior to the main breeding (May-June) most species. Total...
We used fecal samples collected from birds captured in mist nets to determine the occurrence of fruit diets neotropical migrant (species that breed North America and winter Central South America) at six study sites Costa Rica. A total 1016 migrants representing 30 species were captured. Fecal 85 percent all Fruits (seeds, pulp) occurred 58 samples; proportion containing ranged 0 (9 species) over 90 species). Individual contained seeds as many 4 plants. At least 98 plant 29 families...
Birds directly affect seed dispersal through (1) the number of seeds they remove and (2) where in what condition those are deposited. Dispersal effectiveness is a composite these quality quantity components dispersal. In this study, removed patterns deposition by six bird species were determined for four shrubs Melastomataceae. Bird differed both that contributed most to component not always same as component. Thus, evaluate ecological roles frugivores their dispersers requires integration...