Use of boreal forested wetlands by Pacific loons (Gavia pacifica Lawrence) and horned grebes (Podiceps auritus L.): Relations with limnological characteristics

Developments in Hydrobiology
By: , and 

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Abstract

Our objective was to determine if the occurrence and abundance of Pacific loons (Gavia pacifica Lawrence) and horned grebes (Podiceps auritus L.) on 123 wetlands of Yukon Flats National Wildlife Refuge in east central Alaska were related to the limnological characteristics of those wetlands. Aquatic bird-wetland use surveys were conducted in conjunction with limnological sampling from May through September 1985–87 and May through August 1989. Results from logistic regression analysis demonstrated a significant association between the probability of wetland use by Pacific loons and shoreline length, water color, calcium and total phosphorus. Wetland use by horned grebes was related to shoreline length, pH, and chlorophyll. Aquatic bird abundance was then used as a Poisson response variable and modeled as a function of wetland limnological characteristics. Our results indicate that Pacific loon abundance was adequately modeled by linear and quadratic functions of shoreline length, color, pH, calcium and total phosphorus. Horned grebe abundance could not be modeled with this approach. The statistical techniques known collectively as generalized linear models provided a framework for the development of models for aquatic bird use of wetlands. Our results, however, indicate that while this approach shows promise, a better understanding of how to model aquatic bird abundance is needed. We then identify problems in model development and suggest avenues for future research.

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Additional publication details

Publication type Book chapter
Publication Subtype Book Chapter
Title Use of boreal forested wetlands by Pacific loons (Gavia pacifica Lawrence) and horned grebes (Podiceps auritus L.): Relations with limnological characteristics
Series title Developments in Hydrobiology
ISBN 978-94-010-4493-6
DOI 10.1007/978-94-011-1128-7_17
Year Published 1994
Language English
Publisher Springer
Contributing office(s) Alaska Science Center
Description 13 p.
Larger Work Type Book
Larger Work Subtype Monograph
Larger Work Title Developments in Hydrobiology: Aquatic birds in the trophic web of lakes: Proceedings of a symposium held in Sackville, New Brunswick, Canada, in August 1991
First page 171
Last page 183
Conference Location Sackville, NB
Conference Date August 1991
Country United States
State Alaska
Other Geospatial Yukon Flats National Wildlife Refuge