Wildlife Elective Course Essay
The photoperiods influence on the Svalbart ptarmigan, Lagopus mutus hyperboreus. Svalbard, 79o N, is a part of the arctic, defined by the 10o isotherm for the warmest summer month. Animals here are exposed for extreme climates both in temperature and variation in daylight throughout the year. The Sv...
Main Author: | |
---|---|
Other Authors: | |
Format: | Text |
Language: | English |
Subjects: | |
Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.628.711 http://www.behav.org/student_essay/concept/karlsen_photoperiod_svalbart_ptarmigan.pdf |
id |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.628.711 |
---|---|
record_format |
openpolar |
spelling |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.628.711 2023-05-15T15:05:40+02:00 Wildlife Elective Course Essay Silje Karlsen The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.628.711 http://www.behav.org/student_essay/concept/karlsen_photoperiod_svalbart_ptarmigan.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.628.711 http://www.behav.org/student_essay/concept/karlsen_photoperiod_svalbart_ptarmigan.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.behav.org/student_essay/concept/karlsen_photoperiod_svalbart_ptarmigan.pdf text ftciteseerx 2016-01-08T15:20:44Z The photoperiods influence on the Svalbart ptarmigan, Lagopus mutus hyperboreus. Svalbard, 79o N, is a part of the arctic, defined by the 10o isotherm for the warmest summer month. Animals here are exposed for extreme climates both in temperature and variation in daylight throughout the year. The Svalbard ptarmigan is the only resident bird that lives permanently at such high latitudes. Here the sun stays below the horizon for two months and cause total darkness from mid of November to February, while in the summer the sun stays above the horizon permanently and gives continuous daylight. It has been necessary for the svalbard ptarmigan to develop some adaptions for surviving in such a hash climate, like behavioural changes and deposition of huge stores of fat. It is therefore interesting how the photoperiods influence on the svalbard ptarmigans FI (food intake) and BW (body mass) throughout the year. The university in Tromsø has done some research on these subjects, where they’ve tested the bird’s reactions to light and measured the concentration of plasma melatonin, which is a hormone that usually is low during the day and high during the night. The blood sample was Text Arctic Lagopus mutus Svalbard Tromsø Unknown Arctic Svalbard Tromsø |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
description |
The photoperiods influence on the Svalbart ptarmigan, Lagopus mutus hyperboreus. Svalbard, 79o N, is a part of the arctic, defined by the 10o isotherm for the warmest summer month. Animals here are exposed for extreme climates both in temperature and variation in daylight throughout the year. The Svalbard ptarmigan is the only resident bird that lives permanently at such high latitudes. Here the sun stays below the horizon for two months and cause total darkness from mid of November to February, while in the summer the sun stays above the horizon permanently and gives continuous daylight. It has been necessary for the svalbard ptarmigan to develop some adaptions for surviving in such a hash climate, like behavioural changes and deposition of huge stores of fat. It is therefore interesting how the photoperiods influence on the svalbard ptarmigans FI (food intake) and BW (body mass) throughout the year. The university in Tromsø has done some research on these subjects, where they’ve tested the bird’s reactions to light and measured the concentration of plasma melatonin, which is a hormone that usually is low during the day and high during the night. The blood sample was |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Silje Karlsen |
spellingShingle |
Silje Karlsen Wildlife Elective Course Essay |
author_facet |
Silje Karlsen |
author_sort |
Silje Karlsen |
title |
Wildlife Elective Course Essay |
title_short |
Wildlife Elective Course Essay |
title_full |
Wildlife Elective Course Essay |
title_fullStr |
Wildlife Elective Course Essay |
title_full_unstemmed |
Wildlife Elective Course Essay |
title_sort |
wildlife elective course essay |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.628.711 http://www.behav.org/student_essay/concept/karlsen_photoperiod_svalbart_ptarmigan.pdf |
geographic |
Arctic Svalbard Tromsø |
geographic_facet |
Arctic Svalbard Tromsø |
genre |
Arctic Lagopus mutus Svalbard Tromsø |
genre_facet |
Arctic Lagopus mutus Svalbard Tromsø |
op_source |
http://www.behav.org/student_essay/concept/karlsen_photoperiod_svalbart_ptarmigan.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.628.711 http://www.behav.org/student_essay/concept/karlsen_photoperiod_svalbart_ptarmigan.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766337318625476608 |