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 Botello, A. and F. Alvarez (2006) Allometric growth in Creaseria morleyi (Creaser, 1936) (Decapoda: Palaemonidae), from the Yucatan Peninsula, Mexico. Caribbean Journal of Science 42(2): 171–179. PDF is 2.0MB

 

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Reference ID 27245
Reference type journalarticle
Authors Botello, A.
Alvarez, F.
Publication Year (for display) 2006
Publication Year (for sorting) 2006
Title Allometric growth in _Creaseria morleyi_ (Creaser, 1936) (Decapoda: Palaemonidae), from the Yucatan Peninsula, Mexico
Secondary Title Caribbean Journal of Science
Secondary Authors  
Tertiary Title  
Tertiary Authors  
Volume 42
Issue 2
Pages 171–179
Place published  
Published  
Date  
URL
Abstract
The palaemonid shrimp Creaseria morleyi is widely distributed along the northern portion of the Yucatan Peninsula inhabiting submerged cave systems. A high degree of morphological variation is evident in the shape of the carapace and the relative lengths of the first two pereiopods in the larger organisms. In order to find an explanation for these changes in taxonomically important characters, a morphometric analysis was undertaken. Several body parts as well as individual articles of the first and second pereiopods were measured for a total of 24 variables. The equation Y = aX(b), was used to calculate the divergence from isometry in relation to carapace length. Males ranged in total length from 31.6 to 49.3 mm and females from 37.8 to 65.6 mm. For males, all regressions considering body variables showed negative allometry, except for gonopod length. For females, the only variable showing positive allometry was carapace width, suggesting that as females increase in size the carapace becomes wider than longer. Regarding the first pereiopod, almost all variables showed negative allometry; males and females did not differ markedly in this respect. For the second pereiopod, males showed negative allometry; however, for females, chela related dimensions exhibited positive allometric growth, consistent with the diverging morphology of the larger females. Regressions for males and females were significantly different describing a sexual dimorphism. Graphic representations of the tendencies show that significant changes, in the morphology, or in the level of allometry, occur in females at sizes between 46 and 60 mm of total length.
Keywords Creaseria morleyi Palaemonidae allometric growth cave fauna CARIDEA SHRIMPS PRAWN
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Last Changed Wed Dec 5 10:57:53 2012

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