Annual cycles in body mass and reproduction of Chiricahua fox squirrels (Sciurus nayaritensis chiricahuae)

Bret S. Pasch, John Koprowski

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The Chiricahua fox squirrel (Sciurus nayaritensis chiricahuae) is an uncommon subspecies endemic to the Chiricahua Mountains of southeastern Arizona. We monitored annual cycles of body mass and reproduction to elucidate factors shaping the ecology of the sexes. Body mass of adult males did not fluctuate seasonally, although males tended to be heavier in winter. Body mass of adult females fluctuated seasonally, with lower body masses in summer than winter. Males and females did not differ in body mass in summer and fall, but females were heavier than males in winter and spring. Males with scrotal testes were found in the population during all seasons, but were especially prevalent in winter and spring. The majority of lactating females were present in spring and summer. Annual cycles in reproduction and body mass of Chiricahua fox squirrels are similar to more widespread species of tree squirrels, although males did not exhibit typical body mass fluctuations. Extreme spatial and temporal fluctuations of food experienced by Chiricahua fox squirrels might result in annual patterns in space use and body mass that differ from tree squirrels living in forests with a greater abundance of food.

Original languageEnglish (US)
Pages (from-to)531-535
Number of pages5
JournalSouthwestern Naturalist
Volume51
Issue number4
DOIs
StatePublished - Dec 2006

Fingerprint

Sciurus
squirrels
foxes
annual cycle
body mass
winter
summer
lactating females
space use
food
subspecies
testes
mountains
ecology
mountain
gender

ASJC Scopus subject areas

  • Ecology

Cite this

Annual cycles in body mass and reproduction of Chiricahua fox squirrels (Sciurus nayaritensis chiricahuae). / Pasch, Bret S.; Koprowski, John.

In: Southwestern Naturalist, Vol. 51, No. 4, 12.2006, p. 531-535.

Research output: Contribution to journalArticle

@article{74d8b231904f44eb8fac311878e74e66,
title = "Annual cycles in body mass and reproduction of Chiricahua fox squirrels (Sciurus nayaritensis chiricahuae)",
abstract = "The Chiricahua fox squirrel (Sciurus nayaritensis chiricahuae) is an uncommon subspecies endemic to the Chiricahua Mountains of southeastern Arizona. We monitored annual cycles of body mass and reproduction to elucidate factors shaping the ecology of the sexes. Body mass of adult males did not fluctuate seasonally, although males tended to be heavier in winter. Body mass of adult females fluctuated seasonally, with lower body masses in summer than winter. Males and females did not differ in body mass in summer and fall, but females were heavier than males in winter and spring. Males with scrotal testes were found in the population during all seasons, but were especially prevalent in winter and spring. The majority of lactating females were present in spring and summer. Annual cycles in reproduction and body mass of Chiricahua fox squirrels are similar to more widespread species of tree squirrels, although males did not exhibit typical body mass fluctuations. Extreme spatial and temporal fluctuations of food experienced by Chiricahua fox squirrels might result in annual patterns in space use and body mass that differ from tree squirrels living in forests with a greater abundance of food.",
author = "Pasch, {Bret S.} and John Koprowski",
year = "2006",
month = "12",
doi = "10.1894/0038-4909(2006)51[531:ACIBMA]2.0.CO;2",
language = "English (US)",
volume = "51",
pages = "531--535",
journal = "Southwestern Naturalist",
issn = "0038-4909",
publisher = "Southwestern Association of Naturalists",
number = "4",

}

TY - JOUR

T1 - Annual cycles in body mass and reproduction of Chiricahua fox squirrels (Sciurus nayaritensis chiricahuae)

AU - Pasch, Bret S.

AU - Koprowski, John

PY - 2006/12

Y1 - 2006/12

N2 - The Chiricahua fox squirrel (Sciurus nayaritensis chiricahuae) is an uncommon subspecies endemic to the Chiricahua Mountains of southeastern Arizona. We monitored annual cycles of body mass and reproduction to elucidate factors shaping the ecology of the sexes. Body mass of adult males did not fluctuate seasonally, although males tended to be heavier in winter. Body mass of adult females fluctuated seasonally, with lower body masses in summer than winter. Males and females did not differ in body mass in summer and fall, but females were heavier than males in winter and spring. Males with scrotal testes were found in the population during all seasons, but were especially prevalent in winter and spring. The majority of lactating females were present in spring and summer. Annual cycles in reproduction and body mass of Chiricahua fox squirrels are similar to more widespread species of tree squirrels, although males did not exhibit typical body mass fluctuations. Extreme spatial and temporal fluctuations of food experienced by Chiricahua fox squirrels might result in annual patterns in space use and body mass that differ from tree squirrels living in forests with a greater abundance of food.

AB - The Chiricahua fox squirrel (Sciurus nayaritensis chiricahuae) is an uncommon subspecies endemic to the Chiricahua Mountains of southeastern Arizona. We monitored annual cycles of body mass and reproduction to elucidate factors shaping the ecology of the sexes. Body mass of adult males did not fluctuate seasonally, although males tended to be heavier in winter. Body mass of adult females fluctuated seasonally, with lower body masses in summer than winter. Males and females did not differ in body mass in summer and fall, but females were heavier than males in winter and spring. Males with scrotal testes were found in the population during all seasons, but were especially prevalent in winter and spring. The majority of lactating females were present in spring and summer. Annual cycles in reproduction and body mass of Chiricahua fox squirrels are similar to more widespread species of tree squirrels, although males did not exhibit typical body mass fluctuations. Extreme spatial and temporal fluctuations of food experienced by Chiricahua fox squirrels might result in annual patterns in space use and body mass that differ from tree squirrels living in forests with a greater abundance of food.

UR - http://www.scopus.com/inward/record.url?scp=33846570606&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33846570606&partnerID=8YFLogxK

U2 - 10.1894/0038-4909(2006)51[531:ACIBMA]2.0.CO;2

DO - 10.1894/0038-4909(2006)51[531:ACIBMA]2.0.CO;2

M3 - Article

VL - 51

SP - 531

EP - 535

JO - Southwestern Naturalist

JF - Southwestern Naturalist

SN - 0038-4909

IS - 4

ER -