Reversed Sexual Size Dimorphism: Effect on Resource Defense and Foraging Behaviors of Nonbreeding Northern Harriers
Abstract Sexual differences in resource defense and foraging behaviors during the nonbreeding season are detailed for Northern Harriers (Circus cyaneus) in California. Female harriers hunted more frequently in high (>0.5 m) vegetation than males. In addition, females hunted at slower speeds and u...
Published in: | The Auk |
---|---|
Main Author: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Oxford University Press (OUP)
1986
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1093/auk/103.1.70 http://academic.oup.com/auk/article-pdf/103/1/70/30081057/auk0070.pdf |
id |
croxfordunivpr:10.1093/auk/103.1.70 |
---|---|
record_format |
openpolar |
spelling |
croxfordunivpr:10.1093/auk/103.1.70 2023-12-31T10:05:57+01:00 Reversed Sexual Size Dimorphism: Effect on Resource Defense and Foraging Behaviors of Nonbreeding Northern Harriers Temeles, Ethan J. 1986 http://dx.doi.org/10.1093/auk/103.1.70 http://academic.oup.com/auk/article-pdf/103/1/70/30081057/auk0070.pdf en eng Oxford University Press (OUP) The Auk volume 103, issue 1, page 70-78 ISSN 0004-8038 1938-4254 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 1986 croxfordunivpr https://doi.org/10.1093/auk/103.1.70 2023-12-06T09:09:53Z Abstract Sexual differences in resource defense and foraging behaviors during the nonbreeding season are detailed for Northern Harriers (Circus cyaneus) in California. Female harriers hunted more frequently in high (>0.5 m) vegetation than males. In addition, females hunted at slower speeds and used different hunting behaviors than males. Females in high vegetation showed a significantly greater response (i.e. attack) rate to approaching harriers than males, and females won nearly all (28/29) aggressive interactions with males. These results suggest that sexual differences in harrier foraging behavior during the nonbreeding season result from females excluding males from preferred foraging areas and males adopting alternative foraging strategies. Foraging strategies of harrier sexes are compared with foraging strategies of sexes of birds in which males are larger than females to examine the role of body size in determining sexual foraging strategies. Article in Journal/Newspaper Circus cyaneus Oxford University Press (via Crossref) The Auk 103 1 70 78 |
institution |
Open Polar |
collection |
Oxford University Press (via Crossref) |
op_collection_id |
croxfordunivpr |
language |
English |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Temeles, Ethan J. Reversed Sexual Size Dimorphism: Effect on Resource Defense and Foraging Behaviors of Nonbreeding Northern Harriers |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
Abstract Sexual differences in resource defense and foraging behaviors during the nonbreeding season are detailed for Northern Harriers (Circus cyaneus) in California. Female harriers hunted more frequently in high (>0.5 m) vegetation than males. In addition, females hunted at slower speeds and used different hunting behaviors than males. Females in high vegetation showed a significantly greater response (i.e. attack) rate to approaching harriers than males, and females won nearly all (28/29) aggressive interactions with males. These results suggest that sexual differences in harrier foraging behavior during the nonbreeding season result from females excluding males from preferred foraging areas and males adopting alternative foraging strategies. Foraging strategies of harrier sexes are compared with foraging strategies of sexes of birds in which males are larger than females to examine the role of body size in determining sexual foraging strategies. |
format |
Article in Journal/Newspaper |
author |
Temeles, Ethan J. |
author_facet |
Temeles, Ethan J. |
author_sort |
Temeles, Ethan J. |
title |
Reversed Sexual Size Dimorphism: Effect on Resource Defense and Foraging Behaviors of Nonbreeding Northern Harriers |
title_short |
Reversed Sexual Size Dimorphism: Effect on Resource Defense and Foraging Behaviors of Nonbreeding Northern Harriers |
title_full |
Reversed Sexual Size Dimorphism: Effect on Resource Defense and Foraging Behaviors of Nonbreeding Northern Harriers |
title_fullStr |
Reversed Sexual Size Dimorphism: Effect on Resource Defense and Foraging Behaviors of Nonbreeding Northern Harriers |
title_full_unstemmed |
Reversed Sexual Size Dimorphism: Effect on Resource Defense and Foraging Behaviors of Nonbreeding Northern Harriers |
title_sort |
reversed sexual size dimorphism: effect on resource defense and foraging behaviors of nonbreeding northern harriers |
publisher |
Oxford University Press (OUP) |
publishDate |
1986 |
url |
http://dx.doi.org/10.1093/auk/103.1.70 http://academic.oup.com/auk/article-pdf/103/1/70/30081057/auk0070.pdf |
genre |
Circus cyaneus |
genre_facet |
Circus cyaneus |
op_source |
The Auk volume 103, issue 1, page 70-78 ISSN 0004-8038 1938-4254 |
op_doi |
https://doi.org/10.1093/auk/103.1.70 |
container_title |
The Auk |
container_volume |
103 |
container_issue |
1 |
container_start_page |
70 |
op_container_end_page |
78 |
_version_ |
1786837699549724672 |