Body temperature distributions of active diurnal lizards in three deserts: Skewed up or skewed down?
The performance of ectotherms integrated over time depends in part on the position and shape of the distribution of body temperatures (Tb) experienced during activity. For several complementary reasons, physiological ecologists have long expected that Tb distributions during activity should have a l...
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Veröffentlicht in: | Functional ecology 2018-02, Vol.32 (2), p.334-344 |
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description | The performance of ectotherms integrated over time depends in part on the position and shape of the distribution of body temperatures (Tb) experienced during activity. For several complementary reasons, physiological ecologists have long expected that Tb distributions during activity should have a long left tail (left‐skewed), but only infrequently have they quantified the magnitude and direction of Tb skewness in nature.
To evaluate whether left‐skewed Tb distributions are general for diurnal desert lizards, we compiled and analysed Tb (∑ = 9,023 temperatures) from our own prior studies of active desert lizards in three continents (25 species in Western Australia, 10 in the Kalahari Desert of Africa and 10 species in western North America). We gathered these data over several decades, using standardized techniques.
Many species showed significantly left‐skewed Tb distributions, even when records were restricted to summer months. However, magnitudes of skewness were always small, such that mean Tb were never more than 1°C lower than median Tb. The significance of Tb skewness was sensitive to sample size, and power tests reinforced this sensitivity.
The magnitude of skewness was not obviously related to phylogeny, desert, body size or median body temperature. Moreover, a formal phylogenetic analysis is inappropriate because geography and phylogeny are confounded (i.e. are highly collinear).
Skewness might be limited if lizards pre‐warm inside retreats before emerging in the morning, emerge only when operative temperatures are high enough to speed warming to activity Tb, or if cold lizards are especially wary and difficult to spot or catch. Telemetry studies may help evaluate these possibilities.
A plain language summary is available for this article.
Plain Language Summary |
doi_str_mv | 10.1111/1365-2435.12966 |
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To evaluate whether left‐skewed Tb distributions are general for diurnal desert lizards, we compiled and analysed Tb (∑ = 9,023 temperatures) from our own prior studies of active desert lizards in three continents (25 species in Western Australia, 10 in the Kalahari Desert of Africa and 10 species in western North America). We gathered these data over several decades, using standardized techniques.
Many species showed significantly left‐skewed Tb distributions, even when records were restricted to summer months. However, magnitudes of skewness were always small, such that mean Tb were never more than 1°C lower than median Tb. The significance of Tb skewness was sensitive to sample size, and power tests reinforced this sensitivity.
The magnitude of skewness was not obviously related to phylogeny, desert, body size or median body temperature. Moreover, a formal phylogenetic analysis is inappropriate because geography and phylogeny are confounded (i.e. are highly collinear).
Skewness might be limited if lizards pre‐warm inside retreats before emerging in the morning, emerge only when operative temperatures are high enough to speed warming to activity Tb, or if cold lizards are especially wary and difficult to spot or catch. Telemetry studies may help evaluate these possibilities.
A plain language summary is available for this article.
Plain Language Summary</description><identifier>ISSN: 0269-8463</identifier><identifier>EISSN: 1365-2435</identifier><identifier>DOI: 10.1111/1365-2435.12966</identifier><language>eng</language><publisher>London: Wiley</publisher><subject>ANIMAL PHYSIOLOGICAL ECOLOGY ; Body size ; Body temperature ; body temperature distribution ; Continents ; Desert environments ; desert lizards ; Deserts ; Diurnal ; ectotherm ; Geography ; Lizards ; Phylogeny ; skewed distribution ; Skewed distributions ; Skewness ; Species ; Telemetry ; thermal biology ; thermoregulation</subject><ispartof>Functional ecology, 2018-02, Vol.32 (2), p.334-344</ispartof><rights>2017 The Authors. © 2017 British Ecological Society</rights><rights>2017 The Authors. Functional Ecology © 2017 British Ecological Society</rights><rights>Functional Ecology © 2018 British Ecological Society</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c3786-a10bbcd0ce747235317b5f3a15efb1e4a70fa6e52c2dc3cd892038c338bea2d3</citedby><cites>FETCH-LOGICAL-c3786-a10bbcd0ce747235317b5f3a15efb1e4a70fa6e52c2dc3cd892038c338bea2d3</cites><orcidid>0000-0002-4962-8670 ; 0000-0003-3915-6945</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.jstor.org/stable/pdf/48582588$$EPDF$$P50$$Gjstor$$H</linktopdf><linktohtml>$$Uhttps://www.jstor.org/stable/48582588$$EHTML$$P50$$Gjstor$$H</linktohtml><link.rule.ids>314,780,784,803,1417,1433,27924,27925,45574,45575,46409,46833,58017,58250</link.rule.ids></links><search><contributor>Sinclair, Brent</contributor><creatorcontrib>Huey, Raymond B.</creatorcontrib><creatorcontrib>Pianka, Eric R.</creatorcontrib><title>Body temperature distributions of active diurnal lizards in three deserts: Skewed up or skewed down?</title><title>Functional ecology</title><description>The performance of ectotherms integrated over time depends in part on the position and shape of the distribution of body temperatures (Tb) experienced during activity. For several complementary reasons, physiological ecologists have long expected that Tb distributions during activity should have a long left tail (left‐skewed), but only infrequently have they quantified the magnitude and direction of Tb skewness in nature.
To evaluate whether left‐skewed Tb distributions are general for diurnal desert lizards, we compiled and analysed Tb (∑ = 9,023 temperatures) from our own prior studies of active desert lizards in three continents (25 species in Western Australia, 10 in the Kalahari Desert of Africa and 10 species in western North America). We gathered these data over several decades, using standardized techniques.
Many species showed significantly left‐skewed Tb distributions, even when records were restricted to summer months. However, magnitudes of skewness were always small, such that mean Tb were never more than 1°C lower than median Tb. The significance of Tb skewness was sensitive to sample size, and power tests reinforced this sensitivity.
The magnitude of skewness was not obviously related to phylogeny, desert, body size or median body temperature. Moreover, a formal phylogenetic analysis is inappropriate because geography and phylogeny are confounded (i.e. are highly collinear).
Skewness might be limited if lizards pre‐warm inside retreats before emerging in the morning, emerge only when operative temperatures are high enough to speed warming to activity Tb, or if cold lizards are especially wary and difficult to spot or catch. Telemetry studies may help evaluate these possibilities.
A plain language summary is available for this article.
Plain Language Summary</description><subject>ANIMAL PHYSIOLOGICAL ECOLOGY</subject><subject>Body size</subject><subject>Body temperature</subject><subject>body temperature distribution</subject><subject>Continents</subject><subject>Desert environments</subject><subject>desert lizards</subject><subject>Deserts</subject><subject>Diurnal</subject><subject>ectotherm</subject><subject>Geography</subject><subject>Lizards</subject><subject>Phylogeny</subject><subject>skewed distribution</subject><subject>Skewed distributions</subject><subject>Skewness</subject><subject>Species</subject><subject>Telemetry</subject><subject>thermal biology</subject><subject>thermoregulation</subject><issn>0269-8463</issn><issn>1365-2435</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><recordid>eNqFkM9LwzAUx4MoOKdnT0LAc7f8aNr0qGPTwcDL7iFNXzGjW2aSKvWvt111V9_lwXvfz-PxQeiekhnta055JhKWcjGjrMiyCzQ5Ty7RhLCsSGSa8Wt0E8KOEFIIxiZo_eyqDkfYH8Hr2HrAlQ3R27KN1h0CdjXWJtrPYd76g25wY7-1rwK2BxzfPfQLCOBjuEVXtW4C3P32KdqultvFa7J5e1kvnjaJ4bnMEk1JWZqKGMjTnHHBaV6KmmsqoC4ppDontc5AMMMqw00lC0a4NJzLEjSr-BQ9jmeP3n20EKLaudNjQdGiSGVeUE771HxMGe9C8FCro7d77TtFiRp0qUGOGuSok66eECPxZRvo_our1XLxxz2M3C5E589cKoVkQkr-A39qdos</recordid><startdate>20180201</startdate><enddate>20180201</enddate><creator>Huey, Raymond B.</creator><creator>Pianka, Eric R.</creator><general>Wiley</general><general>Wiley Subscription Services, Inc</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7QG</scope><scope>7SN</scope><scope>7SS</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>P64</scope><scope>RC3</scope><orcidid>https://orcid.org/0000-0002-4962-8670</orcidid><orcidid>https://orcid.org/0000-0003-3915-6945</orcidid></search><sort><creationdate>20180201</creationdate><title>Body temperature distributions of active diurnal lizards in three deserts</title><author>Huey, Raymond B. ; Pianka, Eric R.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c3786-a10bbcd0ce747235317b5f3a15efb1e4a70fa6e52c2dc3cd892038c338bea2d3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2018</creationdate><topic>ANIMAL PHYSIOLOGICAL ECOLOGY</topic><topic>Body size</topic><topic>Body temperature</topic><topic>body temperature distribution</topic><topic>Continents</topic><topic>Desert environments</topic><topic>desert lizards</topic><topic>Deserts</topic><topic>Diurnal</topic><topic>ectotherm</topic><topic>Geography</topic><topic>Lizards</topic><topic>Phylogeny</topic><topic>skewed distribution</topic><topic>Skewed distributions</topic><topic>Skewness</topic><topic>Species</topic><topic>Telemetry</topic><topic>thermal biology</topic><topic>thermoregulation</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Huey, Raymond B.</creatorcontrib><creatorcontrib>Pianka, Eric R.</creatorcontrib><collection>CrossRef</collection><collection>Animal Behavior Abstracts</collection><collection>Ecology Abstracts</collection><collection>Entomology Abstracts (Full archive)</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Engineering Research Database</collection><collection>Biotechnology and BioEngineering Abstracts</collection><collection>Genetics Abstracts</collection><jtitle>Functional ecology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Huey, Raymond B.</au><au>Pianka, Eric R.</au><au>Sinclair, Brent</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Body temperature distributions of active diurnal lizards in three deserts: Skewed up or skewed down?</atitle><jtitle>Functional ecology</jtitle><date>2018-02-01</date><risdate>2018</risdate><volume>32</volume><issue>2</issue><spage>334</spage><epage>344</epage><pages>334-344</pages><issn>0269-8463</issn><eissn>1365-2435</eissn><abstract>The performance of ectotherms integrated over time depends in part on the position and shape of the distribution of body temperatures (Tb) experienced during activity. For several complementary reasons, physiological ecologists have long expected that Tb distributions during activity should have a long left tail (left‐skewed), but only infrequently have they quantified the magnitude and direction of Tb skewness in nature.
To evaluate whether left‐skewed Tb distributions are general for diurnal desert lizards, we compiled and analysed Tb (∑ = 9,023 temperatures) from our own prior studies of active desert lizards in three continents (25 species in Western Australia, 10 in the Kalahari Desert of Africa and 10 species in western North America). We gathered these data over several decades, using standardized techniques.
Many species showed significantly left‐skewed Tb distributions, even when records were restricted to summer months. However, magnitudes of skewness were always small, such that mean Tb were never more than 1°C lower than median Tb. The significance of Tb skewness was sensitive to sample size, and power tests reinforced this sensitivity.
The magnitude of skewness was not obviously related to phylogeny, desert, body size or median body temperature. Moreover, a formal phylogenetic analysis is inappropriate because geography and phylogeny are confounded (i.e. are highly collinear).
Skewness might be limited if lizards pre‐warm inside retreats before emerging in the morning, emerge only when operative temperatures are high enough to speed warming to activity Tb, or if cold lizards are especially wary and difficult to spot or catch. Telemetry studies may help evaluate these possibilities.
A plain language summary is available for this article.
Plain Language Summary</abstract><cop>London</cop><pub>Wiley</pub><doi>10.1111/1365-2435.12966</doi><tpages>11</tpages><orcidid>https://orcid.org/0000-0002-4962-8670</orcidid><orcidid>https://orcid.org/0000-0003-3915-6945</orcidid><oa>free_for_read</oa></addata></record> |
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subjects | ANIMAL PHYSIOLOGICAL ECOLOGY Body size Body temperature body temperature distribution Continents Desert environments desert lizards Deserts Diurnal ectotherm Geography Lizards Phylogeny skewed distribution Skewed distributions Skewness Species Telemetry thermal biology thermoregulation |
title | Body temperature distributions of active diurnal lizards in three deserts: Skewed up or skewed down? |
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