Richard Bierregaard

Richard Bierregaard
  • PhD
  • Research Associate at Academy of Natural Sciences of Drexel University

About

145
Publications
35,566
Reads
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10,637
Citations
Current institution
Academy of Natural Sciences of Drexel University
Current position
  • Research Associate
Additional affiliations
January 2012 - present
Academy of Natural Sciences of Drexel University
Position
  • Research Associate
January 1990 - January 1993
Smithsonian Institution
Position
  • Principal Investigator-Biological Dynamics of Forest Fragments Project
January 1990 - January 1993
Smithsonian Institution
Position
  • Principal Investigator-Biological Dynamics of Forest Fragments Project

Publications

Publications (145)
Article
Full-text available
Recent long-term studies in protected areas have revealed the loss of biodiversity, yet the ramifications for ecosystem health and resilience remain unknown. Here, we investigate how the loss of understory birds, in the lowest stratum of the forest, affects avian biomass and functional diversity in the Amazon rainforest. Across approximately 30 yea...
Article
Full-text available
For many avian species, spatial migration patterns remain largely undescribed, especially across hemispheric extents. Recent advancements in tracking technologies and high‐resolution species distribution models (i.e., eBird Status and Trends products) provide new insights into migratory bird movements and offer a promising opportunity for integrati...
Article
Full-text available
Warming from climate change is expected to reduce body size of endotherms, but studies from temperate sys­tems have produced equivocal results. Over four decades, we collected morphometric data on a nonmigratory understory bird community within Amazonian primary rainforest that is experiencing increasingly extreme climate. All 77 species showed low...
Article
Full-text available
Flying over the open sea is energetically costly for terrestrial birds. Despite this, over-water journeys of many birds, sometimes hundreds of kilometres long, are uncovered by bio-logging technology. To understand how these birds afford their flights over the open sea, we investigated the role of atmospheric conditions, specifically wind and uplif...
Article
Full-text available
How are rainforest birds faring in the Anthropocene? We use bird captures spanning > 35 years from 55 sites within a vast area of intact Amazonian rainforest to reveal reduced abundance of terrestrial and near‐ground insectivores in the absence of deforestation, edge effects or other direct anthropogenic landscape change. Because undisturbed forest...
Article
Timing of activity can reveal an organism's efforts to optimize foraging either by minimizing energy loss through passive movement or by maximizing energetic gain through foraging. Here, we assess whether signals of either of these strategies are detectable in the timing of activity of daily, local movements by birds. We compare the similarities of...
Article
Timing of activity can reveal an organism's efforts to optimize foraging either by minimizing energy loss through passive movement or by maximizing energetic gain through foraging. Here, we assess whether signals of either of these strategies are detectable in the timing of activity of daily, local movements by birds. We compare the similarities of...
Preprint
Full-text available
The open sea is considered an ecological barrier to terrestrial bird movement. However, over-water journeys of many terrestrial birds, sometimes hundreds of kilometers long, are being uncovered by bio-logging technology. To understand how these birds afford their flights over the open sea, we investigated the role of atmospheric conditions in subsi...
Article
Full-text available
Habitat destruction and degradation are the leading causes of species declines and extinctions in the world. Human altered landscapes often leave fragments of previously continuous habitat, which may be of significant conservation value. We assessed the effects of habitat fragmentation on the taxonomic diversity, community composition, and nestedne...
Article
Full-text available
Background Vast areas of lowland neotropical forest have regenerated after initially being cleared for agricultural purposes. The ecological value of regenerating second growth to forest-dwelling birds may largely depend on the age of the forest, associated vegetative structure, and when it is capable of sustaining avian demographics similar to tho...
Article
Full-text available
Aim Animal movement is an important determinant of individual survival, population dynamics and ecosystem structure and function. Nonetheless, it is still unclear how local movements are related to resource availability and the spatial arrangement of resources. Using resident bird species and migratory bird species outside the migratory period, we...
Chapter
In an old residential neighborhood of Charlotte, North Carolina, the loud, baritone call of a barred owl (Strix varia) breaks the quiet of a late winter evening, not so much asking as demanding to know “Who cooks for you, who cooks for you-all?” His mate responds, in a slightly higher key, and their conversation escalates into a raucous caterwaulin...
Article
Full-text available
Collision with vehicles is a major if not the dominant source of mortality for owls. Despite this, there has been no study to date on Barred Owl-vehicle collisions, a species that breeds in densely-populated suburban neighborhoods with high road density. We capitalized on the availability of a large dataset of the locations of Barred Owls hit by ve...
Article
Full-text available
To compensate for drift, an animal migrating through air or sea must be able to navigate. Although some species of bird, fish, insect, mammal, and reptile are capable of drift compensation, our understanding of the spatial reference frame, and associated coordinate space, in which these navigational behaviors occur remains limited. Using high resol...
Article
Full-text available
North American Ospreys (Pandion haliaetus) typically migrate long distances to their wintering grounds in the tropics. Beyond the general distribution of their wintering range (i.e., the Caribbean, South America, and Central America), very little is known about the wintering ecology of these birds. We used satellite telemetry to determine the durat...
Article
Full-text available
Migración Primaveral de Individuos Adultos de Pandion haliaetus La mayoría de los individuos de Pandion haliaetus son migratorios, reproduciéndose en latitudes hacia el norte y migrando largas distancias hacia y desde los sitios de invernada en los trópicos. Aunque los patrones de migración otoñal de P. haliaetus han sido descriptos y estudiados, s...
Article
Full-text available
The Osprey (Pandion haliaetus) population nesting between New York City and Boston, Massachusetts, collapsed from approximately 1000 pairs in 1940 to 109 in the early 1970s. In the 1970s, within five or six years of the cessation of DDT use in the region, the Osprey population began recovering. The recovery was asynchronous across the region. Curre...
Article
Full-text available
Ospreys (Pandion haliaetus) are remarkable raptors. Their choice of conspicuous nest sites and surprising tolerance for nesting in nearly intimate association with humans render them an iconic piece of aquatic ecosystems in both marine and freshwater habitats across the northern hemisphere and much of Australasia (Australia to Indonesia). Wintering...
Conference Paper
Background/Question/Methods For decades, researchers have studied fundamental questions of how Amazonian biodiversity is maintained, and whether that diversity can persist as Amazonian forests are increasingly perturbed. Our approach to addressing these questions has changed, however, as theory and empirical understanding have developed. The long...
Article
Although it has long been recognized that many tropical birds do not share the same narrow breeding periods as temperate birds, conventional thinking considers tropical breeding seasons to be discrete periods generally governed by rainfall seasonality. We used a database of >31,000 captures of 104 species collected over 17 years in rainforest near...
Article
Full-text available
The energetically challenging periods of molting and breeding are usually temporally separated in temperate birds, but can occur simultaneously in tropical birds, a condition known as molt—breeding overlap. Here, we document great variation in the timing and duration of molting and breeding, and in the extent of molt-breeding overlap, among 87 spec...
Data
All species captured before isolation and their status in 2007. For each fragment size class, ‘Pre’ is the number of fragments where the species was detected preisolation, and ‘2007’ is the number of those same fragments where it was detected by any means in 2007 (thus a fragment where a species was detected only in 2007 does not get counted). ‘200...
Data
Extinctions between preisolation and 2007 by fragment size class. ‘Extinct species’ and ‘Proportion of species extinct’ include all species that went extinct in any fragment of that size class, even if the species persisted in other fragments of the same size class. ‘Proportion of possible extinctions’ represents the total number of species x fragm...
Article
Full-text available
Inferences about species loss following habitat conversion are typically drawn from short-term surveys, which cannot reconstruct long-term temporal dynamics of extinction and colonization. A long-term view can be critical, however, to determine the stability of communities within fragments. Likewise, landscape dynamics must be considered, as second...
Article
Full-text available
Tropical deforestation often produces landscapes characterized by isolated patches of forest habitat surrounded by pasture, agriculture, or regrowth vegetation. Both the size and the distribution of these forest patches may influence the long-term persistence of faunal species. There is, therefore, a pressing need to understand faunal responses to...
Article
Full-text available
In this paper we describe band-recovery data from 90 ospreys (Pandion haliaetus), banded in North America and recovered in Brazil between 1937 and 2006. Data were obtained from the Bird Banding Laboratory (US Geological Survey, USA) and from the Centro Nacional de Pesquisa para Conservação das Aves Silvestres (IBAMA, Brazil). The majority of osprey...
Article
We sampled understory bummingbirds in Amazonian forest fragments from before isolation through nine years after isolation. We recorded 377 captures of eight species in five 1‐ba fragments and four 10‐ha fragments. The three species netted before isolation , Phaethornis superciliosus, Phaethornis bourcieri, and Thalurania furcata, were nearly equall...
Article
Full-text available
Condicionamiento Comportamental y Técnicas para Atrapar a Strix Varia Entrenamos individuos de Strix varia para asociar un silbido o llamado con la provisión de alimento. Esto facilitó enormemente atrapar a las aves, localizar sus nidos y pichones, y reconocer el reemplazo en las parejas reproductivas. Atrapamos 61 lechuzas en un total de 78 veces....
Article
Full-text available
Resumimos y discutimos observaciones recientes de migraciones nocturnas de Pandion haliaetus. En el otoño de 2004, desde la plataforma de observación (elevación 320 m) del edificio Empire State en la ciudad de Nueva York se realizaron dos avistamientos nocturnos de individuos migrando hacia el sur. De igual forma, el monitoreo satelital ha revelado...
Article
Full-text available
Understory bird communities have been studied in a series of Amazonian rainforest fragments near Manaus, Brazil for about 20 years. Previous analysis of standardized mist-net samples revealed considerable temporal dynamism in capture rates, with communities in fragments responding to growth or cutting of the second growth matrix. This pattern was s...

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