Behavioral ecology of coastal peregrines (Falco peregrinus pealei)
Bibliography: p. 448-485. A long-term study, 1968-75, of Peregrine Falcons at Langara Island, British Columbia, produced much information on the behavior and ecology of this population. An ethogram summarizes descriptions and functions of 43 behavior patterns in courtship, 32 in territorial advertis...
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ftunivcalgary:oai:prism.ucalgary.ca:1880/13157 2023-08-27T04:09:20+02:00 Behavioral ecology of coastal peregrines (Falco peregrinus pealei) Nelson, Robert Wayne Myres, M. Timothy 200000254 1977 xxi, 490 leaves : ill. 30 cm. application/pdf http://hdl.handle.net/1880/13157 https://doi.org/10.11575/PRISM/24399 eng eng University of Calgary Calgary 82481021 Nelson, R. W. (1977). Behavioral ecology of coastal peregrines (Falco peregrinus pealei) (Unpublished doctoral thesis). University of Calgary, Calgary, AB. doi:10.11575/PRISM/24399 http://dx.doi.org/10.11575/PRISM/24399 http://hdl.handle.net/1880/13157 University of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission. Peregrine falcon Birds - Habits and behavior Birds - British Columbia doctoral thesis 1977 ftunivcalgary https://doi.org/10.11575/PRISM/24399 2023-08-06T06:26:21Z Bibliography: p. 448-485. A long-term study, 1968-75, of Peregrine Falcons at Langara Island, British Columbia, produced much information on the behavior and ecology of this population. An ethogram summarizes descriptions and functions of 43 behavior patterns in courtship, 32 in territorial advertisement and defense, and 15 in self, nest and food defense. Males are more active in courtship, territorial advertisement and defense. Mainly same-sex intruders are chased, but males also evict females. Nine hypotheses of sexual size dimorphism are considered. I conclude that aerial combat with dangerous weapons selects for smaller males, better combatants; the proportion of aerial to ground fighting sets the lower limit to the size of males. The annual schedule of courtship, incubation, nestling, fledgling, and dispersal phases is described. Seasonal changes in courtship are not proximate causes of egglaying. Photoperiod is an early timer for laying. Ambient temperature is a "final" timer, initiating rapid follicle growth ea. two weeks before Egg 1 is laid. Early egglaying gives juveniles more experience before autumn-winter hardships. Productivity over eight years averaged 1.76 fledglings per territorial pair, and 2.32 per successful pair. Average breeding spans were: males, 6.0 years; females, 3.5 years (survival rates: 0.85, 0.75). A first year survival rate of ea. 0.45-0.55, and a floating population at least 50% of the size of the breeding population were estimated. The Langara falcons declined from ea. 21-23 pairs in the early 1950s to 5-6 pairs in 1968-?5. This decline paralleled a seabird decline, apparently throughout the Queen Charlotte Islands. Falcons amalgamate territories by means of pseudopolyandry; an orderly population decline results, toward a new "equilibrium" with the prey base. Peregrines occupy Type A, B-A, and B territories, from 0.3-0.5 km to ca. 15 km in diameter. Individuals establish and adjust territory size in relation to available food. They harvest on a conservative sustained-yield ... Doctoral or Postdoctoral Thesis Falco peregrinus peregrine falcon PRISM - University of Calgary Digital Repository Queen Charlotte ENVELOPE(-132.088,-132.088,53.255,53.255) Langara Island ENVELOPE(-133.021,-133.021,54.235,54.235) |
institution |
Open Polar |
collection |
PRISM - University of Calgary Digital Repository |
op_collection_id |
ftunivcalgary |
language |
English |
topic |
Peregrine falcon Birds - Habits and behavior Birds - British Columbia |
spellingShingle |
Peregrine falcon Birds - Habits and behavior Birds - British Columbia Nelson, Robert Wayne Behavioral ecology of coastal peregrines (Falco peregrinus pealei) |
topic_facet |
Peregrine falcon Birds - Habits and behavior Birds - British Columbia |
description |
Bibliography: p. 448-485. A long-term study, 1968-75, of Peregrine Falcons at Langara Island, British Columbia, produced much information on the behavior and ecology of this population. An ethogram summarizes descriptions and functions of 43 behavior patterns in courtship, 32 in territorial advertisement and defense, and 15 in self, nest and food defense. Males are more active in courtship, territorial advertisement and defense. Mainly same-sex intruders are chased, but males also evict females. Nine hypotheses of sexual size dimorphism are considered. I conclude that aerial combat with dangerous weapons selects for smaller males, better combatants; the proportion of aerial to ground fighting sets the lower limit to the size of males. The annual schedule of courtship, incubation, nestling, fledgling, and dispersal phases is described. Seasonal changes in courtship are not proximate causes of egglaying. Photoperiod is an early timer for laying. Ambient temperature is a "final" timer, initiating rapid follicle growth ea. two weeks before Egg 1 is laid. Early egglaying gives juveniles more experience before autumn-winter hardships. Productivity over eight years averaged 1.76 fledglings per territorial pair, and 2.32 per successful pair. Average breeding spans were: males, 6.0 years; females, 3.5 years (survival rates: 0.85, 0.75). A first year survival rate of ea. 0.45-0.55, and a floating population at least 50% of the size of the breeding population were estimated. The Langara falcons declined from ea. 21-23 pairs in the early 1950s to 5-6 pairs in 1968-?5. This decline paralleled a seabird decline, apparently throughout the Queen Charlotte Islands. Falcons amalgamate territories by means of pseudopolyandry; an orderly population decline results, toward a new "equilibrium" with the prey base. Peregrines occupy Type A, B-A, and B territories, from 0.3-0.5 km to ca. 15 km in diameter. Individuals establish and adjust territory size in relation to available food. They harvest on a conservative sustained-yield ... |
author2 |
Myres, M. Timothy |
format |
Doctoral or Postdoctoral Thesis |
author |
Nelson, Robert Wayne |
author_facet |
Nelson, Robert Wayne |
author_sort |
Nelson, Robert Wayne |
title |
Behavioral ecology of coastal peregrines (Falco peregrinus pealei) |
title_short |
Behavioral ecology of coastal peregrines (Falco peregrinus pealei) |
title_full |
Behavioral ecology of coastal peregrines (Falco peregrinus pealei) |
title_fullStr |
Behavioral ecology of coastal peregrines (Falco peregrinus pealei) |
title_full_unstemmed |
Behavioral ecology of coastal peregrines (Falco peregrinus pealei) |
title_sort |
behavioral ecology of coastal peregrines (falco peregrinus pealei) |
publisher |
University of Calgary |
publishDate |
1977 |
url |
http://hdl.handle.net/1880/13157 https://doi.org/10.11575/PRISM/24399 |
op_coverage |
200000254 |
long_lat |
ENVELOPE(-132.088,-132.088,53.255,53.255) ENVELOPE(-133.021,-133.021,54.235,54.235) |
geographic |
Queen Charlotte Langara Island |
geographic_facet |
Queen Charlotte Langara Island |
genre |
Falco peregrinus peregrine falcon |
genre_facet |
Falco peregrinus peregrine falcon |
op_relation |
82481021 Nelson, R. W. (1977). Behavioral ecology of coastal peregrines (Falco peregrinus pealei) (Unpublished doctoral thesis). University of Calgary, Calgary, AB. doi:10.11575/PRISM/24399 http://dx.doi.org/10.11575/PRISM/24399 http://hdl.handle.net/1880/13157 |
op_rights |
University of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission. |
op_doi |
https://doi.org/10.11575/PRISM/24399 |
_version_ |
1775350537865134080 |