Twenty-four-hour feeding and lying patterns of wild reindeer Rangifer tarandus tarandus in summer
We tested whether sunlight and insect harassment were important proximate factors (Zeitgebers) controlling feeding and lying patterns of wild reindeer (Rangifer tarandus tarandus) in summer. With no insect harassment, feeding and lying each exhibited a polycyclic rhythm with, on average, 4 bouts at...
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2001
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crcansciencepubl:10.1139/z01-186 2023-12-17T10:49:08+01:00 Twenty-four-hour feeding and lying patterns of wild reindeer Rangifer tarandus tarandus in summer Colman, Jonathan E Pedersen, Christian Hjermann, Dag Ø. Holand, Øystein Moe, Stein R Reimers, Eigil 2001 http://dx.doi.org/10.1139/z01-186 http://www.nrcresearchpress.com/doi/pdf/10.1139/z01-186 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 79, issue 12, page 2168-2175 ISSN 0008-4301 1480-3283 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 2001 crcansciencepubl https://doi.org/10.1139/z01-186 2023-11-19T13:38:37Z We tested whether sunlight and insect harassment were important proximate factors (Zeitgebers) controlling feeding and lying patterns of wild reindeer (Rangifer tarandus tarandus) in summer. With no insect harassment, feeding and lying each exhibited a polycyclic rhythm with, on average, 4 bouts at equal intervals during each 24-h period (unit-sum constraints in a polycyclic rhythm). When insects were absent, the activity percentages were 50 ± 4% feeding (mean ± SE) and 33 ± 4% lying for daytime and 44 ± 3% feeding and 47 ± 4% lying for nighttime, i.e., the percentage of time spent feeding was equal for daytime and nighttime (nychthemeral), while for lying it was not. With insects present, percentages of time spent feeding and lying were 18 ± 3 and 13 ± 3% for daytime and 45 ± 8 and 41 ± 8% for nighttime, respectively, i.e., neither feeding nor lying exhibited a nychthemeral pattern. During periods of insect harassment, 24-h feeding patterns had no cyclic rhythm, whereas lying remained cyclic, but the percentages of time spent lying during peak bouts (amplitude) and at peak duration (period) were unequal between night and day. Reindeer did not attune their activity to the set points of sunrise and sunset (not crepuscular), demonstrating that daylight is most likely not a powerful Zeitgeber for reindeer during summer. Article in Journal/Newspaper Rangifer tarandus Canadian Science Publishing (via Crossref) Canadian Journal of Zoology 79 12 2168 2175 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Colman, Jonathan E Pedersen, Christian Hjermann, Dag Ø. Holand, Øystein Moe, Stein R Reimers, Eigil Twenty-four-hour feeding and lying patterns of wild reindeer Rangifer tarandus tarandus in summer |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
We tested whether sunlight and insect harassment were important proximate factors (Zeitgebers) controlling feeding and lying patterns of wild reindeer (Rangifer tarandus tarandus) in summer. With no insect harassment, feeding and lying each exhibited a polycyclic rhythm with, on average, 4 bouts at equal intervals during each 24-h period (unit-sum constraints in a polycyclic rhythm). When insects were absent, the activity percentages were 50 ± 4% feeding (mean ± SE) and 33 ± 4% lying for daytime and 44 ± 3% feeding and 47 ± 4% lying for nighttime, i.e., the percentage of time spent feeding was equal for daytime and nighttime (nychthemeral), while for lying it was not. With insects present, percentages of time spent feeding and lying were 18 ± 3 and 13 ± 3% for daytime and 45 ± 8 and 41 ± 8% for nighttime, respectively, i.e., neither feeding nor lying exhibited a nychthemeral pattern. During periods of insect harassment, 24-h feeding patterns had no cyclic rhythm, whereas lying remained cyclic, but the percentages of time spent lying during peak bouts (amplitude) and at peak duration (period) were unequal between night and day. Reindeer did not attune their activity to the set points of sunrise and sunset (not crepuscular), demonstrating that daylight is most likely not a powerful Zeitgeber for reindeer during summer. |
format |
Article in Journal/Newspaper |
author |
Colman, Jonathan E Pedersen, Christian Hjermann, Dag Ø. Holand, Øystein Moe, Stein R Reimers, Eigil |
author_facet |
Colman, Jonathan E Pedersen, Christian Hjermann, Dag Ø. Holand, Øystein Moe, Stein R Reimers, Eigil |
author_sort |
Colman, Jonathan E |
title |
Twenty-four-hour feeding and lying patterns of wild reindeer Rangifer tarandus tarandus in summer |
title_short |
Twenty-four-hour feeding and lying patterns of wild reindeer Rangifer tarandus tarandus in summer |
title_full |
Twenty-four-hour feeding and lying patterns of wild reindeer Rangifer tarandus tarandus in summer |
title_fullStr |
Twenty-four-hour feeding and lying patterns of wild reindeer Rangifer tarandus tarandus in summer |
title_full_unstemmed |
Twenty-four-hour feeding and lying patterns of wild reindeer Rangifer tarandus tarandus in summer |
title_sort |
twenty-four-hour feeding and lying patterns of wild reindeer rangifer tarandus tarandus in summer |
publisher |
Canadian Science Publishing |
publishDate |
2001 |
url |
http://dx.doi.org/10.1139/z01-186 http://www.nrcresearchpress.com/doi/pdf/10.1139/z01-186 |
genre |
Rangifer tarandus |
genre_facet |
Rangifer tarandus |
op_source |
Canadian Journal of Zoology volume 79, issue 12, page 2168-2175 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z01-186 |
container_title |
Canadian Journal of Zoology |
container_volume |
79 |
container_issue |
12 |
container_start_page |
2168 |
op_container_end_page |
2175 |
_version_ |
1785573494538371072 |