A study of the vocal behavior of adult bald eagles during breeding and chick-rearing

Vacuolar myelinopathy is a fatal neurological disease that was initially discovered during a mysterious mass mortality of bald eagles in Arkansas in the United States. The cause of this wildlife disease has eluded scientists for decades while its occurrence has continued to spread throughout freshwater reservoirs in the southeastern United States. Recent studies have demonstrated that vacuolar myelinopathy is induced by consumption of the epiphytic cyanobacterial species Aetokthonos hydrillicola growing on aquatic vegetation, primarily the invasive Hydrilla verticillata. Here, we describe the identification, biosynthetic gene cluster, and biological activity of aetokthonotoxin, a pentabrominated biindole alkaloid that is produced by the cyanobacterium A. hydrillicola. We identify this cyanobacterial neurotoxin as the causal agent of vacuolar myelinopathy and discuss environmental factors—especially bromide availability—that promote toxin production.

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A Review of Factors Affecting Productivity of Bald Eagles in the Great Lakes Region: Implications for Recovery

Environmental Health Perspectives ◽

10.2307/3432412 ◽

1995 ◽

Vol 103 ◽

pp. 51 ◽

Cited By ~ 10

Author(s):

William W. Bowerman ◽

John P. Giesy ◽

David A. Best ◽

Vincent J. Kramer

Keyword(s):

Great Lakes ◽

Great Lakes Region ◽

Bald Eagles ◽

Factors Affecting

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Operant control of vocal behavior in the monkey Cebus albifrons

Psychonomic Science ◽

10.3758/bf03343194 ◽

1965 ◽

Vol 3 (1-12) ◽

pp. 389-390 ◽

Cited By ~ 20

Author(s):

Shirley A. Myers ◽

James A. Horel ◽

Henry S. Pennypacker

Keyword(s):

Vocal Behavior ◽

Cebus Albifrons

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Ecological interactions and habitat modification in nesting Common Murres, Uria aalge

Bird Conservation International ◽

10.1017/s0959270900003154 ◽

1996 ◽

Vol 6 (3) ◽

pp. 261-269 ◽

Cited By ~ 8

Author(s):

Julia K. Parrish ◽

Robert T. Paine

Keyword(s):

Reproductive Output ◽

Habitat Modification ◽

Haliaeetus Leucocephalus ◽

Uria Aalge ◽

Ecological Interactions ◽

Bald Eagles ◽

Predator Removal ◽

Common Murre ◽

Corvus Caurinus ◽

Common Murres

SummarySeabird populations suffer from a variety of natural and human-induced sources of mortality and loss of lifetime reproductive output. On the outer coast of Washington State, Common Murre Uria aalge populations have been in decline for approximately the last decade and are currently reproductively active only at Tatoosh Island. These murres nest in two basic habitat types: crevices (25% of the population) and larger cliff-top subcolonies (75%). Murres in cliff-top subcolonies have suffered dramatic reductions in reproductive success in recent years relative to conspecifics nesting in the crevices, primarily due to egg predation by Glaucous-winged Gulls Larus glaucescens and Northwestern Crows Corvus caurinus, facilitated by the presence of Bald Eagles Haliaeetus leucocephalus. Because predator removal is not feasible and creation of additional crevice habitat is difficult, expensive and potentially ineffective, we have designed a temporary habitat modification (the “silk forest”) which replaces the natural vegetation cover and modifies the interaction between murres and eagles. Within the test subcolony, murres nesting under and immediately adjacent to the silk forest produced nearly twice as many eggs per square metre as their conspecifics nesting in adjacent exposed-ground areas.

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Circuits, hormones, and learning: Vocal behavior in songbirds

Journal of Neurobiology ◽

10.1002/(sici)1097-4695(19971105)33:5<602::aid-neu8>3.0.co;2-8 ◽

1997 ◽

Vol 33 (5) ◽

pp. 602-618 ◽

Cited By ~ 179

Author(s):

Sarah W. Bottjer ◽

Frank Johnson

Keyword(s):

Vocal Behavior

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Parental selection of vocal behavior

Human Nature ◽

10.1007/s12110-006-1015-x ◽

2006 ◽

Vol 17 (2) ◽

pp. 155-168 ◽

Cited By ~ 35

Author(s):

John L. Locke

Keyword(s):

Vocal Behavior ◽

Parental Selection ◽

Selection Of

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Measurement of deceptive voices: Comparing acoustic and perceptual data

Applied Psycholinguistics ◽

10.1017/s0142716400010948 ◽

1997 ◽

Vol 18 (4) ◽

pp. 471-484 ◽

Cited By ~ 11

Author(s):

Patricia Rockwell ◽

David B. Buller ◽

Judee K. Burgoon

Keyword(s):

Detailed Analysis ◽

The Other ◽

Vocal Behavior

ABSTRACTThis study compared vocal features of deception that can be measured by acoustic equipment with vocal features of deception that can be measured perceptually by human coders. As deception researchers have traditionally measured vocal behavior with either acoustic or perceptual methods (but not both), it is uncertain what correspondence, if any, exists between these methods. This study attempted to determine the degree of this correspondence. Deceptive interactions from an earlier study (Burgoon, Buller, Ebesu, & Rockwell, 1994) were used to conduct a detailed analysis of the vocal features of deceptive speech. The vocal samples were analyzed perceptually and acoustically. Results indicated moderate correlations between some acoustic and perceptual variables; neither measurement type, however, proved conclusively superior to the other in discriminating between truth and deception.

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