þÿ<html> <head> <meta name=Title content="Allometry and phenotypic variation in shearwaters"> <meta name=Keywords content=""> <meta http-equiv=Content-Type content="text/html; charset=unicode"> <meta name=ProgId content=Word.Document> <meta name=Generator content="Microsoft Word 11"> <meta name=Originator content="Microsoft Word 11"> <link rel=File-List href="36_1_53-57_files/filelist.xml"> <title>Allometry and phenotypic variation in shearwaters</title> <style> <!-- /* Font Definitions */ @font-face {font-family:"Times New Roman"; panose-1:0 2 2 6 3 5 4 5 2 3;} @font-face {font-family:"Courier New"; panose-1:0 2 7 3 9 2 2 5 2 4;} @font-face {font-family:Wingdings; panose-1:0 5 2 1 2 1 8 4 8 7;} @font-face {font-family:Tahoma; panose-1:0 2 11 6 4 3 5 4 4 2;} @font-face {font-family:"MS Mincho"; panose-1:0 0 0 0 0 0 0 0 0 0;} @font-face {font-family:"Lucida Grande"; panose-1:0 2 11 6 0 4 5 2 2 2;} @font-face {font-family:"Book Antiqua"; panose-1:0 2 4 6 2 5 3 5 3 3;} @font-face {font-family:SimSun; panose-1:0 0 0 0 0 0 0 0 0 0;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {margin:0in; margin-bottom:.0001pt; font-size:12.0pt; font-family:"Times New Roman";} h1 {margin:0in; margin-bottom:.0001pt; line-height:150%; font-size:12.0pt; font-family:"Times New Roman"; font-weight:bold;} p.MsoFootnoteText, li.MsoFootnoteText, div.MsoFootnoteText {margin:0in; margin-bottom:.0001pt; font-size:10.0pt; font-family:"Times New Roman";} p.MsoCommentText, li.MsoCommentText, div.MsoCommentText {margin:0in; margin-bottom:.0001pt; font-size:12.0pt; font-family:"Times New Roman";} p.MsoHeader, li.MsoHeader, div.MsoHeader {margin:0in; margin-bottom:.0001pt; tab-stops:center 3.0in right 6.0in; font-size:12.0pt; font-family:"Times New Roman";} p.MsoFooter, li.MsoFooter, div.MsoFooter {margin:0in; margin-bottom:.0001pt; tab-stops:center 207.65pt right 415.3pt; font-size:12.0pt; font-family:"Times New Roman";} span.MsoFootnoteReference {vertical-align:super;} span.MsoCommentReference {font-size:9.0pt;} p.MsoTitle, li.MsoTitle, div.MsoTitle {margin:0in; margin-bottom:.0001pt; text-align:center; font-size:18.0pt; font-family:"Book Antiqua"; font-weight:bold;} p.MsoBodyText, li.MsoBodyText, div.MsoBodyText {margin:0in; margin-bottom:.0001pt; text-align:justify; line-height:150%; font-size:12.0pt; font-family:"Times New Roman";} p.MsoDocumentMap, li.MsoDocumentMap, div.MsoDocumentMap {margin:0in; margin-bottom:.0001pt; background:navy; font-size:10.0pt; font-family:Tahoma;} p {margin-right:0in; margin-left:0in; font-size:12.0pt; font-family:"Times New Roman";} table.MsoNormalTable {font-size:10.0pt; font-family:"Times New Roman";} p.MsoCommentSubject, li.MsoCommentSubject, div.MsoCommentSubject {margin:0in; margin-bottom:.0001pt; font-size:12.0pt; font-family:"Times New Roman";} table.MsoTableGrid {font-size:10.0pt; font-family:"Times New Roman";} /* Page Definitions */ @page Section1 {size:595.2pt 841.8pt; margin:1.0in 1.0in 1.0in 1.0in;} div.Section1 {page:Section1;} /* List Definitions */ @list l0:level1 {text-indent:-.25in; tab-stops:list .5in; font-family:Symbol;} @list l1:level1 {margin-left:.25in; text-indent:-.25in; tab-stops:list .25in; font-weight:bold; font-style:normal;} ol {margin-bottom:0in;} ul {margin-bottom:0in;} --> </style> </head> <body bgcolor=white lang=EN-US style='tab-interval:.5in'> <div class=Section1> <h1 style='margin-bottom:6.0pt;line-height:normal'><span style='font-weight: normal'>HAYWOOD, J. &amp; BULL, L.S. 2008. Allometry and phenotypic variation in the morphometrics of <i>Puffinus</i></span><span style='font-weight:normal'> shearwaters. <i>Marine Ornithology</i></span><span style='font-weight:normal'> 36: 53-57.</span></h1> <p class=MsoNormal>&nbsp;</p> <p class=MsoNormal><span lang=EN-AU>It has been shown previously, </span><span lang=EN-GB>using </span><span lang=EN-AU>coefficients of variation (CV), that </span><span lang=EN-GB>bill measurements were significantly more variable than those of the wing or foot</span><span lang=EN-AU> among 11 </span><span lang=EN-GB>sexually size dimorphic and seven monomorphic <i>Puffinus</i></span><span lang=EN-GB> shearwater species</span><span lang=EN-AU>. </span><span lang=EN-GB>Patterns of phenotypic variation </span><span lang=EN-AU>were unaffected by </span><span lang=EN-GB>sexual dimorphism.</span><span lang=EN-AU> However, morphological variation can be due to allometry, as CV is affected by the slope of the regression of trait size on an indicator of body size, as well as by the dispersion of points around the regression line (the coefficient of residual variation, CRV). The effect of allometric variation on the previously reported patterns of trait variability in CVs is assessed, using tarsus length as an indicator of overall body size. It is clear that the pattern of variation in the CV is repeated in the CRV. Also, that pattern of variation is not found in allometric regression slopes, and variation in allometric regression slopes does not explain the high CVs reported for bill measurements (depth especially). We conclude that bill measurements are more variable than other measured traits, and that such variability is not a result of a design feature  explained by allometry. This strengthens the previous suggestion of a biological significance to the high variability in <i>Puffinus </i></span><span lang=EN-AU>bill depth. In addition, we show the importance of incorporating a test for allometry before offering possible biological explanations for morphological variation,. </span></p> <p class=MsoNormal>&nbsp;</p> <h1 style='margin-bottom:6.0pt;line-height:normal'><span style='font-weight: normal'>Key words: allometric regression; coefficient of (residual) variation; morphological variation; <span lang=EN-GB><i>Puffinus</i></span><span lang=EN-GB> shearwaters; </span>testing for allometry</span></h1> </div> </body> </html>