Potential environmental influences on variation in body size and sexual size dimorphism among Arizona populations of the western diamond-backed rattlesnake (Crotalus atrox)

Melissa Amarello, Erika M. Nowak, Emily N. Taylor, Gordon W. Schuett, Roger A. Repp, Philip C Rosen, David L. Hardy

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Differences in resource availability and quality along environmental gradients are important influences contributing to intraspecific variation in body size, which influences numerous life-history traits. Here, we examined variation in body size and sexual size dimorphism (SSD) in relation to temperature, seasonality, and precipitation among 10 populations located throughout Arizona of the western diamond-backed rattlesnake (Crotalus atrox). Specifically, in our analyses we addressed the following questions: (i) Are adult males larger in cooler, wetter areas? (ii) Does female body size respond differently to environmental variation? (iii) Is seasonality a better predictor of body size variation? (iv) Is SSD positively correlated with increased resources? We demonstrate that male and female C. atrox are larger in body size in cooler (i.e., lower average annual maximum, minimum, and mean temperature) and wetter areas (i.e., higher average annual precipitation, more variable precipitation, and available surface water). Although SSD in C. atrox appeared to be more pronounced in cooler, wetter areas, this relationship did not achieve statistical significance.

Original languageEnglish (US)
Pages (from-to)1443-1449
Number of pages7
JournalJournal of Arid Environments
Volume74
Issue number11
DOIs
StatePublished - Nov 2010

Fingerprint

Crotalus atrox
dimorphism
diamond
body size
coolers
seasonality
intraspecific variation
environmental quality
environmental gradient
resource availability
life history trait
surface water
temperature
life history
resource

Keywords

  • Ectotherm
  • Precipitation
  • Reptile
  • Resource availability
  • Seasonality
  • Temperature

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Earth-Surface Processes
  • Ecology

Cite this

Potential environmental influences on variation in body size and sexual size dimorphism among Arizona populations of the western diamond-backed rattlesnake (Crotalus atrox). / Amarello, Melissa; Nowak, Erika M.; Taylor, Emily N.; Schuett, Gordon W.; Repp, Roger A.; Rosen, Philip C; Hardy, David L.

In: Journal of Arid Environments, Vol. 74, No. 11, 11.2010, p. 1443-1449.

Research output: Contribution to journalArticle

Amarello, Melissa ; Nowak, Erika M. ; Taylor, Emily N. ; Schuett, Gordon W. ; Repp, Roger A. ; Rosen, Philip C ; Hardy, David L. / Potential environmental influences on variation in body size and sexual size dimorphism among Arizona populations of the western diamond-backed rattlesnake (Crotalus atrox). In: Journal of Arid Environments. 2010 ; Vol. 74, No. 11. pp. 1443-1449.
@article{5de59ce5cf964f3b9ebaa9c1414d8679,
title = "Potential environmental influences on variation in body size and sexual size dimorphism among Arizona populations of the western diamond-backed rattlesnake (Crotalus atrox)",
abstract = "Differences in resource availability and quality along environmental gradients are important influences contributing to intraspecific variation in body size, which influences numerous life-history traits. Here, we examined variation in body size and sexual size dimorphism (SSD) in relation to temperature, seasonality, and precipitation among 10 populations located throughout Arizona of the western diamond-backed rattlesnake (Crotalus atrox). Specifically, in our analyses we addressed the following questions: (i) Are adult males larger in cooler, wetter areas? (ii) Does female body size respond differently to environmental variation? (iii) Is seasonality a better predictor of body size variation? (iv) Is SSD positively correlated with increased resources? We demonstrate that male and female C. atrox are larger in body size in cooler (i.e., lower average annual maximum, minimum, and mean temperature) and wetter areas (i.e., higher average annual precipitation, more variable precipitation, and available surface water). Although SSD in C. atrox appeared to be more pronounced in cooler, wetter areas, this relationship did not achieve statistical significance.",
keywords = "Ectotherm, Precipitation, Reptile, Resource availability, Seasonality, Temperature",
author = "Melissa Amarello and Nowak, {Erika M.} and Taylor, {Emily N.} and Schuett, {Gordon W.} and Repp, {Roger A.} and Rosen, {Philip C} and Hardy, {David L.}",
year = "2010",
month = "11",
doi = "10.1016/j.jaridenv.2010.05.019",
language = "English (US)",
volume = "74",
pages = "1443--1449",
journal = "Journal of Arid Environments",
issn = "0140-1963",
publisher = "Academic Press Inc.",
number = "11",

}

TY - JOUR

T1 - Potential environmental influences on variation in body size and sexual size dimorphism among Arizona populations of the western diamond-backed rattlesnake (Crotalus atrox)

AU - Amarello, Melissa

AU - Nowak, Erika M.

AU - Taylor, Emily N.

AU - Schuett, Gordon W.

AU - Repp, Roger A.

AU - Rosen, Philip C

AU - Hardy, David L.

PY - 2010/11

Y1 - 2010/11

N2 - Differences in resource availability and quality along environmental gradients are important influences contributing to intraspecific variation in body size, which influences numerous life-history traits. Here, we examined variation in body size and sexual size dimorphism (SSD) in relation to temperature, seasonality, and precipitation among 10 populations located throughout Arizona of the western diamond-backed rattlesnake (Crotalus atrox). Specifically, in our analyses we addressed the following questions: (i) Are adult males larger in cooler, wetter areas? (ii) Does female body size respond differently to environmental variation? (iii) Is seasonality a better predictor of body size variation? (iv) Is SSD positively correlated with increased resources? We demonstrate that male and female C. atrox are larger in body size in cooler (i.e., lower average annual maximum, minimum, and mean temperature) and wetter areas (i.e., higher average annual precipitation, more variable precipitation, and available surface water). Although SSD in C. atrox appeared to be more pronounced in cooler, wetter areas, this relationship did not achieve statistical significance.

AB - Differences in resource availability and quality along environmental gradients are important influences contributing to intraspecific variation in body size, which influences numerous life-history traits. Here, we examined variation in body size and sexual size dimorphism (SSD) in relation to temperature, seasonality, and precipitation among 10 populations located throughout Arizona of the western diamond-backed rattlesnake (Crotalus atrox). Specifically, in our analyses we addressed the following questions: (i) Are adult males larger in cooler, wetter areas? (ii) Does female body size respond differently to environmental variation? (iii) Is seasonality a better predictor of body size variation? (iv) Is SSD positively correlated with increased resources? We demonstrate that male and female C. atrox are larger in body size in cooler (i.e., lower average annual maximum, minimum, and mean temperature) and wetter areas (i.e., higher average annual precipitation, more variable precipitation, and available surface water). Although SSD in C. atrox appeared to be more pronounced in cooler, wetter areas, this relationship did not achieve statistical significance.

KW - Ectotherm

KW - Precipitation

KW - Reptile

KW - Resource availability

KW - Seasonality

KW - Temperature

UR - http://www.scopus.com/inward/record.url?scp=77956231844&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77956231844&partnerID=8YFLogxK

U2 - 10.1016/j.jaridenv.2010.05.019

DO - 10.1016/j.jaridenv.2010.05.019

M3 - Article

AN - SCOPUS:77956231844

VL - 74

SP - 1443

EP - 1449

JO - Journal of Arid Environments

JF - Journal of Arid Environments

SN - 0140-1963

IS - 11

ER -