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Eggshell membrane thickness and its contribution to total eggshell thickness for 13 waterbird species

Gary M. Santolo, Auteur ; Sarah H. Peterson, Auteur ; Breanne Cooney, Auteur ; C. Alex Hartman, Auteur ; Mark P. Herzog, Auteur ; Joshua T. Ackerman, Auteur

Dans Wilson Journal of Ornithology (The) (136(1) March, 2024)

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Nesting ecology of White-faced Ibis (Plegadis chihi) in Great Salt Lake, Utah

Mark P. Herzog, Auteur ; Joshua T. Ackerman, Auteur ; C. Alex Hartman, Auteur ; Howard Browers, Auteur

Dans Wilson Journal of Ornithology (The) (132(1) July, 2020)

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California Gull (Larus californicus) Space Use and Timing of Movements in Relation to Landfills and Breeding Colonies

Joshua T. Ackerman, Auteur ; Sarah H. Peterson, Auteur ; Danika C. Tsao, Auteur ; John Y. Takekawa, Auteur

Dans Waterbirds (41(4) December, 2018)

Expanding gull (Laridae) populations throughout the world have been attributed to the availability of anthropogenic food subsidies. The influence of landfills on California Gull (Larus californicus) space use and the timing of their movements wa[...]

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Differentiating Sex and Species of Western Grebes (Aechmophorus occidentalis) and Clark's Grebes (Aechmophorus clarkii) and Their Eggs Using External Morphometrics and Discriminant Function Analysis

C. Alex Hartman, Auteur ; Joshua T. Ackerman, Auteur ; Collin A. Eagles-Smith, Auteur ; Mark P. Herzog, Auteur

Dans Waterbirds (39(1) MAR 2016)

In birds where males and females are similar in size and plumage, sex determination by alternative means is necessary. Discriminant function analysis based on external morphometrics was used to distinguish males from females in two closely relat[...]

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Habitat edges have weak effects on duck nest survival at local spatial scales

Amelia J. Raquel, Auteur ; Kevin M. Ringelman, Auteur ; Joshua T. Ackerman, Auteur ; John M. Eadie, Auteur

Dans Ardea (103(2) Winter, 2015)

Edge effects on nesting success have been documented in breeding birds in a variety of contexts, but there is still uncertainty in how edge type, and spatial scale determine the magnitude and detectability of edge effects. Habitat edges are ofte[...]

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Colony attendance patterns by mated Forster's Terns Sterna forsteri using an automated data-logging receiver system

Jill D. Bluso-Demers, Auteur ; Joshua T. Ackerman, Auteur ; John Y. Takekawa, Auteur

Dans Ardea (98(1) SPR 2010)

In order to examine 24-hour colony attendance patterns by mated Forster's Terns Sterna torsteri in South San Francisco Bay, California. during incubation and chick-rearing stages, we radio-marked 10 individuals consisting of five pairs and recor[...]

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Comparative reproductive biology of sympatric species: nest and chick survival of American avocets and black-necked stilts

Joshua T. Ackerman, Auteur ; Mark P. Herzog, Auteur ; John Y. Takekawa, Auteur ; C. Alex Hartman, Auteur

Dans Journal of Avian Biology (45(6) NOV 2014)

Identifying differences in reproductive success rates of closely related and sympatrically breeding species can be useful for understanding limitations to population growth. We simultaneously examined the reproductive ecology of American avocets[...]

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Gender identification of Caspian Terns using external morphology and discriminant function analysis

Joshua T. Ackerman, Auteur ; John Y. Takekawa, Auteur ; Jill D. Bluso, Auteur ; Julie L. Yee, Auteur ; Collin A. Eagles-Smith, Auteur

Dans Wilson Journal of Ornithology (The) (120(2) 2008)

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