Associations of Bobolink Territory Size with Habitat Quality

Territory size generally varies with habitat quality, including vegetation structure, food abundance and available space. Bobolink (Dolichonyx oryzivorus), a semi-colonial species, is known to respond to these habitat quality factors individually, though no previous study has examined these factors...

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Bibliographic Details
Published in:Annales zoologici fennici 2014-12, Vol.51 (6), p.515-525
Main Authors: Diemer, Kristen M, Nocera, Joseph J
Format: Article
Language:English
Subjects:
Alfalfa
Dolichonyx oryzivorus
Forbs
Habitat conservation
Habitat selection
Invertebrates
Male animals
Modeling
Territories
Vegetation
Vegetation structure
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Summary:Territory size generally varies with habitat quality, including vegetation structure, food abundance and available space. Bobolink (Dolichonyx oryzivorus), a semi-colonial species, is known to respond to these habitat quality factors individually, though no previous study has examined these factors simultaneously in relation to territory size. We examined the relationship between bobolink territory size and vegetation structure, prey abundance and patch size in hayfields of southern Ontario, Canada. All three factors were influential in explaining variation in territory size. Important prey items were more abundant in small territories. These small territories also had taller and denser vegetation, deeper litter, and less bare soil. Territory size was related to patch size, with smaller territories on smaller fields. We compared our results with other studies that have found links between territory size and individual variables, including factors not in our models.
ISSN:0003-455X
1797-2450
DOI:10.5735/086.051.0607