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Evolution of adaptation through allometric shifts in a marine snail

Hollander, Johan LU ; Adams, Dean and Johannesson, Kerstin (2006) In Evolution 60(12). p.2490-2497
Abstract
Variation in ontogenetic development among individuals may be a major contributor to morphological variation within species. Evolution of different growth trajectories might, for example, evolve as a response to varying ecological contexts of individuals living in different environments, or by life-stage or gender differences. The intertidal periwinkle Littorina saxatilis is strongly polymorphic in shell shape. We compared ontogenetic trajectories between life stages, local populations, and sexes to understand how different morphological end points are reached during ontogeny and what might cause these differences. Applying landmark-based geometric morphometrics, we captured shell shape variation for four Swedish populations of this... (More)
Variation in ontogenetic development among individuals may be a major contributor to morphological variation within species. Evolution of different growth trajectories might, for example, evolve as a response to varying ecological contexts of individuals living in different environments, or by life-stage or gender differences. The intertidal periwinkle Littorina saxatilis is strongly polymorphic in shell shape. We compared ontogenetic trajectories between life stages, local populations, and sexes to understand how different morphological end points are reached during ontogeny and what might cause these differences. Applying landmark-based geometric morphometrics, we captured shell shape variation for four Swedish populations of this species. We also derived a method to visualize ontogenetic trajectories described by the relationship of size to the multivariate shape space. We found that growth trajectories differed between individuals living in different habitats, as well as between sexes and maturity stages. Males living on rocky cliffs grew isometrically throughout life, whereas females from the same habitat switched from isometric growth as juveniles to allometric growth as adults. In contrast, males and females living on boulders grew allometrically as juveniles but changed to isometric growth at sexual maturity. Thus, in this species, ontogenetic growth seems influenced by habitat-associated selection as well as by gender and age-specific selection. These differing selection regimes result in ontogenetic shifts in allometry in three of the four groups examined. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Allometric growth, biphasic shape allometry, geometric morphometrics, isometric growth, Littorina saxatilis, local adaptation, ontogeny, rocky shore
in
Evolution
volume
60
issue
12
pages
2490 - 2497
publisher
Wiley-Blackwell
external identifiers
  • scopus:33846868390
ISSN
1558-5646
DOI
10.1554/06-071.1
language
English
LU publication?
yes
id
97e2ba37-7a6c-4c43-baad-e5e87e8d0654 (old id 1982098)
date added to LUP
2011-08-17 12:04:34
date last changed
2019-09-17 01:57:57
@article{97e2ba37-7a6c-4c43-baad-e5e87e8d0654,
  abstract     = {Variation in ontogenetic development among individuals may be a major contributor to morphological variation within species. Evolution of different growth trajectories might, for example, evolve as a response to varying ecological contexts of individuals living in different environments, or by life-stage or gender differences. The intertidal periwinkle Littorina saxatilis is strongly polymorphic in shell shape. We compared ontogenetic trajectories between life stages, local populations, and sexes to understand how different morphological end points are reached during ontogeny and what might cause these differences. Applying landmark-based geometric morphometrics, we captured shell shape variation for four Swedish populations of this species. We also derived a method to visualize ontogenetic trajectories described by the relationship of size to the multivariate shape space. We found that growth trajectories differed between individuals living in different habitats, as well as between sexes and maturity stages. Males living on rocky cliffs grew isometrically throughout life, whereas females from the same habitat switched from isometric growth as juveniles to allometric growth as adults. In contrast, males and females living on boulders grew allometrically as juveniles but changed to isometric growth at sexual maturity. Thus, in this species, ontogenetic growth seems influenced by habitat-associated selection as well as by gender and age-specific selection. These differing selection regimes result in ontogenetic shifts in allometry in three of the four groups examined.},
  author       = {Hollander, Johan and Adams, Dean and Johannesson, Kerstin},
  issn         = {1558-5646},
  keyword      = {Allometric growth,biphasic shape allometry,geometric morphometrics,isometric growth,Littorina saxatilis,local adaptation,ontogeny,rocky shore},
  language     = {eng},
  number       = {12},
  pages        = {2490--2497},
  publisher    = {Wiley-Blackwell},
  series       = {Evolution},
  title        = {Evolution of adaptation through allometric shifts in a marine snail},
  url          = {http://dx.doi.org/10.1554/06-071.1},
  volume       = {60},
  year         = {2006},
}