On the Population Ecology of Uinta Ground Squirrels

A marked population of Spermophilus armatus averaging 529 individuals per year was studied for two and a half seasons on a 22-acre tract in northern Utah. The average date of emergence from hibernation of the first squirrel was 9 April. Mating occurred as soon as animals emerged from hibernation. Th...

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Main Author:	Amend, Spencer R.
Format:	Others
Published:	DigitalCommons@USU 1970
Subjects:	Animal Sciences
Online Access:	https://digitalcommons.usu.edu/etd/4799 https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=5841&context=etd

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record_format	oai_dc
spelling	ndltd-UTAHS-oai-digitalcommons.usu.edu-etd-58412019-10-13T05:34:47Z On the Population Ecology of Uinta Ground Squirrels Amend, Spencer R. A marked population of Spermophilus armatus averaging 529 individuals per year was studied for two and a half seasons on a 22-acre tract in northern Utah. The average date of emergence from hibernation of the first squirrel was 9 April. Mating occurred as soon as animals emerged from hibernation. The average date of appearance of the first litter was 31 May. Emergence sizes of litters were from 5.2 for yearling females to 6.3 for adult females. Few instances of predation were observed. Age and sex ratios varied throughout the season and for different portions of the study area. The population increased 22 percent from 1964-1965 and 15 percent from 1965-1966. Juveniles moved more than adults and males moved more than females. In 1964 and 1965, 90 percent of the squirrels had disappeared into hibernation by 1 August. Active periods were from 61 days for juvenile males to 97 days for adult males. 1970-05-01T07:00:00Z text application/pdf https://digitalcommons.usu.edu/etd/4799 https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=5841&context=etd Copyright for this work is held by the author. Transmission or reproduction of materials protected by copyright beyond that allowed by fair use requires the written permission of the copyright owners. Works not in the public domain cannot be commercially exploited without permission of the copyright owner. Responsibility for any use rests exclusively with the user. For more information contact Andrew Wesolek (andrew.wesolek@usu.edu). All Graduate Theses and Dissertations DigitalCommons@USU Animal Sciences
collection	NDLTD
format	Others
sources	NDLTD
topic	Animal Sciences
spellingShingle	Animal Sciences Amend, Spencer R. On the Population Ecology of Uinta Ground Squirrels
description	A marked population of Spermophilus armatus averaging 529 individuals per year was studied for two and a half seasons on a 22-acre tract in northern Utah. The average date of emergence from hibernation of the first squirrel was 9 April. Mating occurred as soon as animals emerged from hibernation. The average date of appearance of the first litter was 31 May. Emergence sizes of litters were from 5.2 for yearling females to 6.3 for adult females. Few instances of predation were observed. Age and sex ratios varied throughout the season and for different portions of the study area. The population increased 22 percent from 1964-1965 and 15 percent from 1965-1966. Juveniles moved more than adults and males moved more than females. In 1964 and 1965, 90 percent of the squirrels had disappeared into hibernation by 1 August. Active periods were from 61 days for juvenile males to 97 days for adult males.
author	Amend, Spencer R.
author_facet	Amend, Spencer R.
author_sort	Amend, Spencer R.
title	On the Population Ecology of Uinta Ground Squirrels
title_short	On the Population Ecology of Uinta Ground Squirrels
title_full	On the Population Ecology of Uinta Ground Squirrels
title_fullStr	On the Population Ecology of Uinta Ground Squirrels
title_full_unstemmed	On the Population Ecology of Uinta Ground Squirrels
title_sort	on the population ecology of uinta ground squirrels
publisher	DigitalCommons@USU
publishDate	1970
url	https://digitalcommons.usu.edu/etd/4799 https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=5841&context=etd
work_keys_str_mv	AT amendspencerr onthepopulationecologyofuintagroundsquirrels
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On the Population Ecology of Uinta Ground Squirrels

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