GROWTH AND DEVELOPMENT OF NESTLING HEN HARRIERS
SUMMARY Nestling Hen Harriers Circus cyaneus in Orkney were weighed and measured during two nesting seasons. The 501 weights and 390 longest primary measurements produce a composite record of growth for this species. The general shape of both weight and primary growth curves is sigmoid. The primary...
Published in: | Ibis |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
1971
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1111/j.1474-919x.1971.tb05162.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1474-919X.1971.tb05162.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1474-919X.1971.tb05162.x |
id |
crwiley:10.1111/j.1474-919x.1971.tb05162.x |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1111/j.1474-919x.1971.tb05162.x 2024-06-02T08:05:24+00:00 GROWTH AND DEVELOPMENT OF NESTLING HEN HARRIERS Scharf, William C. Balfour, Edward 1971 http://dx.doi.org/10.1111/j.1474-919x.1971.tb05162.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1474-919X.1971.tb05162.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1474-919X.1971.tb05162.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Ibis volume 113, issue 3, page 323-329 ISSN 0019-1019 1474-919X journal-article 1971 crwiley https://doi.org/10.1111/j.1474-919x.1971.tb05162.x 2024-05-03T11:38:25Z SUMMARY Nestling Hen Harriers Circus cyaneus in Orkney were weighed and measured during two nesting seasons. The 501 weights and 390 longest primary measurements produce a composite record of growth for this species. The general shape of both weight and primary growth curves is sigmoid. The primary feather growth can be measured at age seven and eight days after hatching and is less variable as an index of growth than is weight. The nestling period varies usually from 30 to 36 days, and age at first flight depends on the ratio of primary length to weight. Males usually fly before their heavier female siblings. The asynchronous hatching produces a size‐rank between nestling Hen Harriers. The significance of the size‐rank to growth and mortality is discussed. Sexual dimorphism develops at the nestling stage. Weights and measurements of males and females at different ages are tabulated. Asynchronous hatching, and the influence of latitude differences on growth rate are briefly discussed. Article in Journal/Newspaper Circus cyaneus Wiley Online Library Ibis 113 3 323 329 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
SUMMARY Nestling Hen Harriers Circus cyaneus in Orkney were weighed and measured during two nesting seasons. The 501 weights and 390 longest primary measurements produce a composite record of growth for this species. The general shape of both weight and primary growth curves is sigmoid. The primary feather growth can be measured at age seven and eight days after hatching and is less variable as an index of growth than is weight. The nestling period varies usually from 30 to 36 days, and age at first flight depends on the ratio of primary length to weight. Males usually fly before their heavier female siblings. The asynchronous hatching produces a size‐rank between nestling Hen Harriers. The significance of the size‐rank to growth and mortality is discussed. Sexual dimorphism develops at the nestling stage. Weights and measurements of males and females at different ages are tabulated. Asynchronous hatching, and the influence of latitude differences on growth rate are briefly discussed. |
format |
Article in Journal/Newspaper |
author |
Scharf, William C. Balfour, Edward |
spellingShingle |
Scharf, William C. Balfour, Edward GROWTH AND DEVELOPMENT OF NESTLING HEN HARRIERS |
author_facet |
Scharf, William C. Balfour, Edward |
author_sort |
Scharf, William C. |
title |
GROWTH AND DEVELOPMENT OF NESTLING HEN HARRIERS |
title_short |
GROWTH AND DEVELOPMENT OF NESTLING HEN HARRIERS |
title_full |
GROWTH AND DEVELOPMENT OF NESTLING HEN HARRIERS |
title_fullStr |
GROWTH AND DEVELOPMENT OF NESTLING HEN HARRIERS |
title_full_unstemmed |
GROWTH AND DEVELOPMENT OF NESTLING HEN HARRIERS |
title_sort |
growth and development of nestling hen harriers |
publisher |
Wiley |
publishDate |
1971 |
url |
http://dx.doi.org/10.1111/j.1474-919x.1971.tb05162.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1474-919X.1971.tb05162.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1474-919X.1971.tb05162.x |
genre |
Circus cyaneus |
genre_facet |
Circus cyaneus |
op_source |
Ibis volume 113, issue 3, page 323-329 ISSN 0019-1019 1474-919X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1474-919x.1971.tb05162.x |
container_title |
Ibis |
container_volume |
113 |
container_issue |
3 |
container_start_page |
323 |
op_container_end_page |
329 |
_version_ |
1800750206057185280 |