DOCSLIB.ORG

Patch Utilization by Migrating Birds: Resource Oriented?

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Patch Utilization by Migrating Birds: Resource Oriented? ORNISSCANDINAVICA 17: 165-174. Copenhagen1986 Patch utilization by migrating birds: resource oriented? Thomas E. Martin and James R. Karr Martin T. E. and Karr, J. R. 1986. Patch utilization by migrating birds: resource ori- ented? - Ornis Scand. 17: 165-174. Use of gap (created by tree falls) and non-gap forest understory sites by migrating birds in central Illinois was studied during spring and autumn for three years (1978- 1980). Fruit and understory foliage were concentrated in gaps. Birds that relied on these resources (foliage-gleaning insectivores, frugivores in autumn) used gaps more than non-gaps. Birds that fed on food other than fruit and foliage insects ("frugi- vores" in spring, other insectivores) did not use gaps more than non-gaps. Bird abundance varied markedly among gap and non-gap sites, potentially reflecting differences in site preferences. Site selection, as determined by bird abundances, was consistent (correlated) between years for birds that fed on items that were concen- trated in gaps but not for birds that did not rely on these patchy resources. Foliage density is a measure of foraging substrates for foliage-gleaning birds to search. Abun- dance of foliage-gleaning insectivores was highly correlated with foliage density in both spring and autumn. Frugivore abundance was highly correlated with fruiting fo- liage density during autumn when they are frugivorous, but not during spring when they are insectivorous. Insectivores not relying on foliage insects or fruit were un- correlated with either index of resource availability. These same relationships hold even when examining gap sites only. Thus, migrants can be consistent in their se- lection of foraging sites and this consistency appears to exist when resource densities are markedly different among sites (patchy) but not when resources are more disper- sed. T. E. Martin, Dept of Zoology, Arizona State University, Tempe, Arizona 85287, U.S.A. J. R. Karr, Smithsonian Tropical Research Institute, Box 2072, Balboa, Re- public of Panama. bers at the same time as their food and 1. Introduction peak (Graber Graber 1983). Migratory birds use considerable amounts of energy for When resources are patchy, foraging efficiency also is migration; they lose 1-4% of their gross body weight enhanced by selecting habitat patches with more abun- per hour of flying (Graber and Graber 1962, Hussell dant food resources (Charnov 1976, Krebs et al. 1978, 1969). As a result, migrants require periodical replen- Cowie and Krebs 1979, Martin 1985a). However, patch ishment of lost fat stores at stop-over sites to allow suc- selection by migrating birds is rarely studied. Instead, cessful completion of migration (Nisbet and Medway analyses of habitat selection during migration typically 1972, Berthold 1975). Individuals able to maximize have been restricted to general habitat patterns (e.g., their foraging efficiency (rate of food intake) at these Parnell 1969, Laursen 1976, Rappole and Warner 1976, stop-over sites increase their rate of fat deposition and Martin 1980). Only Willson et al. (1982) examined fine their chances of successful migration. One means of en- scale habitat selection patterns during migration. hancing foraging efficiency is to migrate when food is Willson et al. (1982) showed that migrants were more most abundant. Indeed, spring arrival of migrant war- abundant in understory of light gaps than in undisturbed blers in southern Illinois coincides with eruptions of forest understory. Light gaps are created by tree falls. their primary food (lepidopteran larvae); warbler num- More light reaches the forest floor in light gaps, causing Received 7 January1985 Accepted 20 June 1985 ? ORNIS SCANDINAVICA 11 ORNIS SCANDINAVICA 17:2 (1986) 165 increasedgrowth and colonization by understoryveg- 1978-1980. Autumn was divided into early (before 15 etation (Hartshorn 1978, Thompson 1980, Runkle September) and late (after 15 September) subseasons. 1982). As a result, understoryfruits and foliage insects Nets (30 or 36 mm mesh, 4 shelves, 12 m long) were are more concentratedin light gap patchesthan in non- paired between gap and non-gap sites in the forest un- gaps. Thus, preferences for light gaps may reflect se- derstory. Gap nets were placed at the edge of gaps lection of patches with abundantfood by migrants. rather then in the centres to minimize net visibility as a Yet, the density of plants, and associated food re- bias on capture rates. Similar methods have been used sources, differsamong gap sites (Runkle 1982). If birds by Schemske and Brokaw (1981) and Willson et al. are truly selecting sites based on availability of re- (1982) to examine gap and non-gap use by birds. A core sources, then two resultsare predicted:(1) Birdsshould of 10 (5 pairs) nets was placed in the same locationsin be more abundantsat sites with greateramounts of the all seasons and years to examine consistency of site pref- food types they eat. (2) Birds shouldbe more abundant erences by birds. The gaps used for these locations were at the same sites each year, assuming differences in all old and well established with dense shrub under- qualityamong sites varies only a little among years. To story. In each season an additional gap:non-gapnet examine these predictions, we established permanent pairing was placed in a new gap (< 1 year old) that had gap and non-gapsites and monitoreduse of the under- not developed a shrub understory. story of these sites by migratingbirds during spring and A total of 5,212 mist net hours (MNH) was accrued autumn for three years. We focus on three questions. over the six seasons with 458, 476, and 765 MNH during First, do migratingbirds of differingforaging habits dif- springs, and 1205, 1344, and 964 MNH for autumns of fer in their abundanceat gap versusnon-gap understory 1978, 1979, and 1980, respectively. Nets were opened 30 sites? Second, are birdsconsistent in their site selection min before to 30 min after sunrise and left open for 4-6 (i.e., more abundantin the same sites) each year? Fi- hours in all seasons. nally, are differences in bird abundancesamong sites Vegetation cover was sampled during autumn 1979, correlatedwith differences in indexed resource abun- when plants were fruiting, using the point sample dance? method of Karr (1971) in which presence/absence of vegetation was noted at the following height intervals: G (ground), < 0.25, 0.25-0.5, 0.5-1, 1-2, 2-3, 3-5, 5- 2. Study area and methods 7.5, 7.5-10, 10-12.5, 12.5-15, 15-20, and > 20 m. Num- The study site was Trelease Woods, a 22-ha woodlot lo- ber of points in which vegetation was present relative to cated northeast of Urbana, Illinois, USA. Woodlots and total number of points sampled provided percent veg- other forest islandsare importantsources of forest habi- etation cover in each height interval. A total of 30 tat for migratingand breedingbirds in the mid-western points was sampled on three transects at each net. Two U.S. (Martin 1980, 1981, Blake 1983). Principaltree transects ran parallel to the net at a distance of 3-4 m species in TreleaseWoods includedoaks Quercusspp., from the net on each side with points taken every 1 m. sugar maple Acer saccharum, elm Ulmus, white ash The third transect ran perpendicular to and bisected the Fraxinus americana, basswood Tilia americana, and net with points taken every 2 m. Foliage of individual hackberry Celtis occidentalis. The understory included plants that actually bore bird-dispersed fruits (males paw paw Asimina triloba, spicebush Lindera benzoin, and some female individuals of some plants species did grape Vitis spp., moonseed Menispermum canadensis, not bear fruit) was tabulated separately to provide fo- pokeweed Phytolacca americana, Virginia creeper Par- liage cover of fruiting plants. Each site was ranked rela- thenocissus, and poison ivy Toxicodendron radicans. tive to total foliage cover and fruiting foliage cover in Most census proceduresused in studies of birdswere the understory (< 3 m). Analyses based on ranks are designedfor use duringbreeding season when most spe- preferred because true availabilities of resources to ani- cies are relativelysedentary and vocal. Studies during mals are difficult to measure accurately (Johnson 1980). other seasons and in regions such as tropical forest Abundance of birds at each net site were ranked where assumptionsof more classicalprocedures are not based on capture rates (birds/100 MNH) and compared met requiredifferent methods (Karr1979, 1981). Birds among seasons and years and with foliage and fruit during migration are highly transient and often are not cover rankings using a Spearman rank correlation. vocal, especially in autumn. Thus, we used mist-nets to Comparisons among seasons and years allow examin- measure avian use of patches because: (1) We were in- ation of whether birds are consistently more abundant terested in avian use of forest understory patches from 0 at the same net sites. Comparisons with fruit and foliage to 3 m above the ground and mist-nets sample the un- cover rankings allow examination of whether birds are derstory, (2) mist-netsdo not depend on vocalizations more abundant at sites with more fruit or foliage cover. or sedentary birds, and (3) mist-nets allow examination Correlations were based only on the 10 sites netted in all of avian use of small areas, which is a central focus of 6 seasons. this study. Comparisons of capture rates among net sites, micro- Patchuse by birdswas sampledduring spring (15 Ap- habitats, seasons and years were made using the Fisher ril - 29 May) and autumn (24 August - 18 October) of binomial probability test when sample size was small (n 166 ORNIS SCANDINAVICA 17:2 (1986) < 35) and by X2analysis for large samples. Food habit Tab. 1. Capturerates (birds/100mist-net hours) for birdscap- followed Willson et al. for tured in light gaps and undisturbed(non-gap) understoryin assignments (1982) except - 14 and late Warbler and American Redstart.
Load more

Recommended publications
  • Territory Size and Stability in a Sedentary Neotropical Passerine: Is Resource Partitioning a Necessary Condition?
    J. Field Ornithol. 76(4):395±401, 2005 Territory size and stability in a sedentary neotropical passerine: is resource partitioning a necessary condition? Janet V. Gorrell,1 Gary Ritchison,1,3 and Eugene S. Morton2 1 Department of Biological Sciences, Eastern Kentucky University, Richmond, Kentucky 40475 USA 2 Hemlock Hill Field Station, 22318 Teepleville Flats Road, Cambridge Springs, Pennsylvania 16403 USA Received 9 April 2004; accepted 11 April 2005 ABSTRACT. Long-term pair bonds and defense of territories year-round are common among tropical passer- ines. The boundaries of these territories tend to be stable, perhaps re¯ecting the need to defend an area that, regardless of conditions, provides suf®cient food resources. If, however, these stable territories are not, even tem- porarily, suf®ciently large, then intra-pair competition for available food may result, particularly in species with no sexual size dimorphism. With such competition, sex-speci®c differences in foraging behavior may result. Male and female Dusky Antbirds (Cercomacra tyrannina) are not size dimorphic, and pairs jointly defend territories throughout the year. Our objective was to determine if paired Dusky Antbirds exhibited sex-speci®c differences in foraging behavior. Foraging antbirds were observed in central Panama from February±July 2002 to determine if pairs par- titioned food resources. Males and females exhibited no differences in foraging behavior, with individuals of both sexes foraging at similar heights and using the same foraging maneuvers (glean, probe, and sally) and substrates (leaves, rolled leaves, and woody surfaces). These results suggest that Dusky Antbirds do not partition resources and that territory switching, rather than resource partitioning, may be the means by which they gain access to additional food resources.
    [Show full text]
  • The All-Bird Bulletin
    Advancing Integrated Bird Conservation in North America Spring 2014 Inside this issue: The All-Bird Bulletin Protecting Habitat for 4 the Buff-breasted Sandpiper in Bolivia The Neotropical Migratory Bird Conservation Conserving the “Jewels 6 Act (NMBCA): Thirteen Years of Hemispheric in the Crown” for Neotropical Migrants Bird Conservation Guy Foulks, Program Coordinator, Division of Bird Habitat Conservation, U.S. Fish and Bird Conservation in 8 Wildlife Service (USFWS) Costa Rica’s Agricultural Matrix In 2000, responding to alarming declines in many Neotropical migratory bird popu- Uruguayan Rice Fields 10 lations due to habitat loss and degradation, Congress passed the Neotropical Migra- as Wintering Habitat for tory Bird Conservation Act (NMBCA). The legislation created a unique funding Neotropical Shorebirds source to foster the cooperative conservation needed to sustain these species through all stages of their life cycles, which occur throughout the Western Hemi- Conserving Antigua’s 12 sphere. Since its first year of appropriations in 2002, the NMBCA has become in- Most Critical Bird strumental to migratory bird conservation Habitat in the Americas. Neotropical Migratory 14 Bird Conservation in the The mission of the North American Bird Heart of South America Conservation Initiative is to ensure that populations and habitats of North Ameri- Aros/Yaqui River Habi- 16 ca's birds are protected, restored, and en- tat Conservation hanced through coordinated efforts at in- ternational, national, regional, and local Strategic Conservation 18 levels, guided by sound science and effec- in the Appalachians of tive management. The NMBCA’s mission Southern Quebec is to achieve just this for over 380 Neo- tropical migratory bird species by provid- ...and more! Cerulean Warbler, a Neotropical migrant, is a ing conservation support within and be- USFWS Bird of Conservation Concern and listed as yond North America—to Latin America Vulnerable on the International Union for Conser- Coordination and editorial vation of Nature (IUCN) Red List.
    [Show full text]
  • Foraging Niche Structure and Coexistence in a Highly Diverse Community Of
    Foraging niche structure and coexistence in a highly diverse community of Amazonian antbirds (Thamnophilidae: Aves) by SANTIAGO DAVID B.Sc, Universidad de Antioquia, 2011 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE in THE FACULTY OF GRADUATE AND POSTDOCTORAL STUDIES (Zoology) THE UNIVERSITY OF BRITISH COLUMBIA (Vancouver) May 2016 © Santiago David, 2016 Abstract The high species richness of antbirds (Thamnophilidae) in Amazonian lowlands, where as many as 40 species may coexist at local scales, represents a major challenge for ecologists to explain patterns of coexistence and niche evolution. I studied the foraging ecology of a local community of antbirds in a 2-Km2 area of lowland forest in SE Peru to examine how co- occurring antbird species differ in their use of foraging resources, and whether these differences result in niche partitioning at the community level. I also examined whether resource use similarity was related to phylogenetic similarity in this local assemblage. Forty-four species of antbirds were detected in the study plot in a four-year period, with 30 species categorized as the local assemblage of common resident breeders. Multivariate analysis of foraging parameters showed that segregation at two height layers in two types of forest was more important than foraging substrates and maneuvers in explaining the differences observed in foraging behavior. However, a null model analysis revealed that at the community level, antbirds exhibited high foraging niche overlap, with average observed overlap significantly larger than expected by chance, indicating that antbirds prefer, rather than avoid, resources used by other species.
    [Show full text]
  • Pine-Oak-Hemlock--Silviculture Institute 7/18/2017 1
    Pine‐Oak‐Hemlock‐‐Silviculture Institute 7/18/2017 Predicted Responses of Wildlife to Silvicultural Treatments with special focus on Pine‐Oak‐Hemlock Types Matt Tarr Associate Extension Professor, Wildlife Specialist University of New Hampshire Cooperative Extension Northeast Silviculture Institute for Foresters June 18, 2017 What am I talking about? OUTLINE • Overview of the primary factors that determine how wildlife respond to timber harvesting • Overview of how birds, mammals, reptiles & amphibians select their habitat • Summary of expected wildlife response following application of silvicultural treatments in pine‐oak‐hemlock MY GOAL: Help you become better at predicting how wildlife will respond to the decisions you make when managing forested habitats 1 Pine‐Oak‐Hemlock‐‐Silviculture Institute 7/18/2017 When we cut trees, the response by wildlife is determined primarily by: • Plant species • Plant structure composition following the harvest • The size of the canopy opening • Whether soils are • Presence/absence of • Habitats in the dry/moist/wet special habitat features surrounding landscape “Plant structure” = presence & density of plants in each forest layer • What plant layers are present? Canopy layer >30’ Midstory layer 10-30’ Shrub layer 2-10’ Herbaceous layer 0-2’ • How dense are the plants in each layer? SPARSE INTERMEDIATE ABUNDANT/DENSE < 30% coverage 30-75% coverage > 75% coverage 2 Pine‐Oak‐Hemlock‐‐Silviculture Institute 7/18/2017 Role of plant structure in influencing wildlife use of forest stands Forest stands comprised
    [Show full text]
  • A Description of Mixed-Species Insectivorous Bird Flocks in Western Mexico’
    The Condor 89~282-292 0 The Cooper Omithologml Society 1987 A DESCRIPTION OF MIXED-SPECIES INSECTIVOROUS BIRD FLOCKS IN WESTERN MEXICO’ RICHARD L. HUTTO Department of Zoology, Universityof Montana, Missoula, MT 59812 Abstract. Insectivorousbird flockswere observed in all typesof forestedhabitats during the nonbreedingseason in westernMexico. The speciescomposition of flockschanged markedlyand predictablyamong five categoriesof habitat type. The averagenumber of speciesper flockin lowlandhabitats was 4.7, while a mean of 18.6 speciesparticipated in highlandflocks, ranking the latter amongthe most species-richflocks in the world. The meanproportion of the localinsectivorous species that participatedin mixed-speciesflocks wassignificantly greater in the highlands(6 1.3%)than in the lowlands(24.6%). About half of the flock participantsin both undisturbedlowland and highlandhabitats were north temperatemigrants, ranking west Mexican flocks among the mostmigrant-rich in the world as well. In highlandflocks, the maximum numberof individualsper attendantspecies was generallytwo to three,but therewere often six to twelveindividuals belonging to eachof severalnuclear species. The lowlanddeciduous forest flocks seemed to lack nuclearspecies. Key words: Mixed-speciesflocks; insectivorousbirds; Mexico; migratory birds;pine-oak woodlands;tropical deciduous forests. INTRODUCTION mixed-speciesflocks in 26 sites(Appendix I) that Mixed-speciesinsectivorous bird flockshave been were distributed among various habitats described from temperate and tropical areas throughout western Mexico. The habitat types worldwide (Rand 1954), and are known to occur that I surveyed can be roughly classified (after in practically every habitat type (Powell 1985). Pesman 1962) as belonging to either lowland Although mixed-species flocks are quite com- (tropical deciduous and tropical evergreen) or mon in north temperate regions during the non- highland (oak, pine-oak, and boreal) forests.
    [Show full text]
  • Ecology, Morphology, and Behavior in the New World Wood Warblers
    Ecology, Morphology, and Behavior in the New World Wood Warblers A dissertation presented to the faculty of the College of Arts and Sciences of Ohio University In partial fulfillment of the requirements for the degree Doctor of Philosophy Brandan L. Gray August 2019 © 2019 Brandan L. Gray. All Rights Reserved. 2 This dissertation titled Ecology, Morphology, and Behavior in the New World Wood Warblers by BRANDAN L. GRAY has been approved for the Department of Biological Sciences and the College of Arts and Sciences by Donald B. Miles Professor of Biological Sciences Florenz Plassmann Dean, College of Arts and Sciences 3 ABSTRACT GRAY, BRANDAN L., Ph.D., August 2019, Biological Sciences Ecology, Morphology, and Behavior in the New World Wood Warblers Director of Dissertation: Donald B. Miles In a rapidly changing world, species are faced with habitat alteration, changing climate and weather patterns, changing community interactions, novel resources, novel dangers, and a host of other natural and anthropogenic challenges. Conservationists endeavor to understand how changing ecology will impact local populations and local communities so efforts and funds can be allocated to those taxa/ecosystems exhibiting the greatest need. Ecological morphological and functional morphological research form the foundation of our understanding of selection-driven morphological evolution. Studies which identify and describe ecomorphological or functional morphological relationships will improve our fundamental understanding of how taxa respond to ecological selective pressures and will improve our ability to identify and conserve those aspects of nature unable to cope with rapid change. The New World wood warblers (family Parulidae) exhibit extensive taxonomic, behavioral, ecological, and morphological variation.
    [Show full text]
  • Common Birds of the Estero Bay Area
    Common Birds of the Estero Bay Area Jeremy Beaulieu Lisa Andreano Michael Walgren Introduction The following is a guide to the common birds of the Estero Bay Area. Brief descriptions are provided as well as active months and status listings. Photos are primarily courtesy of Greg Smith. Species are arranged by family according to the Sibley Guide to Birds (2000). Gaviidae Red-throated Loon Gavia stellata Occurrence: Common Active Months: November-April Federal Status: None State/Audubon Status: None Description: A small loon seldom seen far from salt water. In the non-breeding season they have a grey face and red throat. They have a long slender dark bill and white speckling on their dark back. Information: These birds are winter residents to the Central Coast. Wintering Red- throated Loons can gather in large numbers in Morro Bay if food is abundant. They are common on salt water of all depths but frequently forage in shallow bays and estuaries rather than far out at sea. Because their legs are located so far back, loons have difficulty walking on land and are rarely found far from water. Most loons must paddle furiously across the surface of the water before becoming airborne, but these small loons can practically spring directly into the air from land, a useful ability on its artic tundra breeding grounds. Pacific Loon Gavia pacifica Occurrence: Common Active Months: November-April Federal Status: None State/Audubon Status: None Description: The Pacific Loon has a shorter neck than the Red-throated Loon. The bill is very straight and the head is very smoothly rounded.
    [Show full text]
  • Surveys of Mixed Species Feeding Flocks in Cloudbridge Nature Reserve, Costa Rica: a Progress Report
    Surveys of Mixed Species Feeding Flocks in Cloudbridge Nature Reserve, Costa Rica: A Progress Report. Jonathan Slifkin July 2019 A Common Chlorospingus (Chlorospingus flavopectus), the most commonly observed bird in Cloudbridge Nature Reserve and a typical mixed species feeding flock leader. Photograph © Jonathan Slifkin. CONTENTS Contents ................................................................................................................................................................................ 1 Appendices ........................................................................................................................................................................... 1 Tables .................................................................................................................................................................................... 1 Figures ................................................................................................................................................................................... 1 1 Abstract ........................................................................................................................................................................ 2 2 Introduction ................................................................................................................................................................ 2 3 Survey locations, Methods, & Materials ................................................................................................................
    [Show full text]
  • Foraging Niches of Foliage-Gleaning Birds in the Northernmost Taiga in Finland
    Foraging niches of foliage-gleaning birds in the northernmost taiga in Finland Raimo Virkkala VirØ, R.1988: Foraging niches of foliage-gleaning birds in the northernmost taiga in Finland . - - Ornis Fennica 65:lØ-113 . The study area was located near the northern coniferous forest margin . Seven niche di- mensions (habitat, tree species, tree size, feeding height in tree, tree part, foliage substrate, feeding technique) were recorded and thesewere combined in four multidimensional axes . The foliage-gleaning guildconsisted of four species, whichcomprised 52-76% of the total birdcommunity, depending on forest type. The Siberian Tit Paruscinctus and the Siberian Jay Perisoreus infaustus are specialists of virgin coniferous forests, whereas the Brambling Fringilla montifDngilla and the Willow Warbler Phylloscopus trochilus are forest habitat generalists . The multidimensional (seven-dimensional) foraging niches of the Siberian Tit and Siberian Jay were broader than those of the Brambling and Willow Warbler. Tree species, tree part andfoliage substrate were the mostimportant dimensions segregating the foliage- gleaning species from each other. The foraging niche of the Siberian Jay deviated most from thoseoftheother species . Body size was connected with segregation ofspecies onthe microhabitat dimensions, especially on tree part and foliage substrate, but not on macrohabitat (habitat, tree species, tree size) and foraging height dimensions. Body size differences can be considered effective with respect to the foraging of the species The broad niches of the two sedentary species, the Siberian Tit and Siberian Jay, are suggested to be adaptations to the harshphysical conditions in thesenorthern latitudes.The migratory species, the Brambling and Willow Warbler, preferred seasonally abundant foraging resources in deciduous trees and on leaves and needles.
    [Show full text]
  • Reflections on the Heart of Borneo
    Reflections on the Heart of Borneo Borneo.indd 1 10/15/08 4:41:35 PM Borneo.indd 2 10/15/08 4:41:35 PM Reflections on the Heart of Borneo editors Gerard A. Persoon Manon Osseweijer Tropenbos International Wageningen, the Netherlands 2008 Borneo.indd 3 10/15/08 4:41:36 PM Gerard A. Persoon and Manon Osseweijer (editors) Reflections on the Heart of Borneo (Tropenbos Series 24) Cover: Farmer waiting for the things to come (photo: G.A. Persoon) ISBN 978-90-5113-091-1 ISSN 1383-6811 © 2008 Tropenbos International The opinions expressed in this publication are those of the author(s) and do not necessarily reflect the views of Tropenbos International. No part of this publication, apart from bibliographic data and brief quotations in critical reviews, may be reproduced, re-recorded or published in any form including print photocopy, microfilm, and electromagnetic record without prior written permission. Layout: Sjoukje Rienks, Amsterdam Borneo.indd 4 10/15/08 4:41:36 PM Preface This book contains a selection of revised papers that were presented during the Heart of Borneo conference in Leiden in 2005. This conference was organised jointly by the World Wide Fund for Nature (wwf Netherlands), the Internation- al Institute for Asian Studies (iias) and the Institute of Environmental Sciences (cml) as a follow-up of another conference organised in Brunei in April 2005. During that meeting political leaders of Malaysia, Indonesia and Brunei, together with scientists from the region, as well as representatives of the major interna- tional conservation agencies discussed the need to collectively take responsibility for the protection of the Heart of Borneo, the large transborder area of high con- servation value shared by the three countries.
    [Show full text]
  • Behavioral Ecology of Amazonian Mixed-Species Flocks
    BEHAVIORAL ECOLOGY OF AMAZONIAN MIXED-SPECIES FLOCKS By Sean M. Williams A DISSERTATION Submitted to Michigan State University in partial fulfillment of the requirements for the degree of Zoology–Doctor of Philosophy Ecology, Evolutionary Biology, and Behavior–Dual Major 2017 ABSTRACT BEHAVIORAL ECOLOGY OF AMAZONIAN MIXED-SPECIES FLOCKS By Sean M. Williams Amazonian mixed-species flocks of birds are remarkable by virtue of their strength of interspecific association. In these flocks, individuals of different species associate with each other for the duration of their lives, i.e. during all daylight hours, 365 days of the year across many years. These obligate relationships provide a unique opportunity to study the behavioral ecology of dependent interspecific relationships. I break my thesis into three chapters. First, I ask whether the relationship between two obligatorily flocking species (nuclear antshrike and antwren species) is symmetrical and whether transient species (non-obligate flocking species) are equally attracted to the nuclear species. Are the transient species equally attracted to the two nuclear species? And are the two nuclear species equally attracted to each other? This first question was necessary to ask before my other questions because I needed to know which species are following other species and which species are being followed. Then, I ask whether the behavior of a single species (the same antshrike species I determined was mostly being followed in the first question) can predict the space use of the whole flock and what environmental and behavioral variables explain the space use. Finally, I ask whether a particular context-dependent vocalization of the antshrike might serve as a mechanism of interspecific cohesion of the flock.
    [Show full text]
  • Feeding Ecology and Territorial Behavior of the Yellow Warbler
    Utah State University DigitalCommons@USU All Graduate Theses and Dissertations Graduate Studies 5-1967 Feeding Ecology and Territorial Behavior of the Yellow Warbler Merrill J. Frydendall Utah State University Follow this and additional works at: https://digitalcommons.usu.edu/etd Part of the Zoology Commons Recommended Citation Frydendall, Merrill J., "Feeding Ecology and Territorial Behavior of the Yellow Warbler" (1967). All Graduate Theses and Dissertations. 2876. https://digitalcommons.usu.edu/etd/2876 This Dissertation is brought to you for free and open access by the Graduate Studies at DigitalCommons@USU. It has been accepted for inclusion in All Graduate Theses and Dissertations by an authorized administrator of DigitalCommons@USU. For more information, please contact [email protected]. FEEDING ECOLOGY AND TERRITORIAL BEHAVIOR OF THE YELLOW WARBLER by Merrill J, Frydendall A dissertation submitted in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY in Zoology UTAH STATE UNIVERSITY Logan, Utah r ACKNOWLEDGMENTS I wish to acknowledge the guidance and assistance of Dr. Keith L. Dixon throughout the course of this study, Valuable criticisms offered by Drs, D, M, Hammond, F. H, Wagner, H. H, Wiebe, and Mr. W, J, Hanson have been beneficial in the final preparation of the dissertation, Appreciation also goes to members of the entomology department, especially to W, J, Hanson for his aid in insect identification, S, Kohler for his help in identification of stomach contents, and C, Summers and L, B. Coons for aid in the insecticide application, My final and deepest appreciation goes to my family for their patience and understanding, and especially to my wife, Karen, for her help typing the manuscript and field notes, along with her many other duties, This study was supported in part by Public Health Service Fellow­ ships l-Fl-GM-28,401-01 and l-Fl-GM-28,401-02 from the National Insti­ tutes of Health and a National Science Foundation Grant G-23904 to Dr, Keith L.
    [Show full text]