Arching effect on fish body shape in geometric morphometric studies

Valentin, Alexandra; Penin, Xavier; Chanut, Jean-Pierre; Sévigny, Jean‐Marie; Rohlf, F. James

doi:10.1111/j.1095-8649.2008.01961.x

Cited by 81 publications

(88 citation statements)

References 26 publications

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“…First, alignment of every specimen was applied through superimposition of the two landmarks at the longitudinal extremities TA B L E 1 Information on lakes where ciscoes were sampled, including form or habitat of capture (BEN = benthic net, PEL = pelagic net), presence of Mysis diluviana, and sample sizes for each type of analysis of the shape (L1 and L2; see Figure 2). Finally, an unbending procedure was executed as suggested by Valentin, Penin, Chanut, Sévigny, and Rohlf (2008) to counteract the arching effect of posture on body shape. Finally, an unbending procedure was executed as suggested by Valentin, Penin, Chanut, Sévigny, and Rohlf (2008) to counteract the arching effect of posture on body shape.…”

Section: Morphologymentioning

confidence: 99%

Evolution and diversity of two cisco forms in an outlet of glacial Lake Algonquin

Piette‐Lauzière

Bell

Ridgway

et al. 2019

Ecology and Evolution

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The diversity of Laurentian Great Lakes ciscoes (Coregonus artedi, sensu lato) arose via repeated local adaptive divergence including deepwater ciscoes that are now extirpated or threatened. The nigripinnis form, or Blackfin Cisco, is extirpated from the Great Lakes and remains only in Lake Nipigon. Putative nigripinnis populations were recently discovered in sympatry with artedi in a historical drainage system of glacial Lake Algonquin, the precursor of lakes Michigan and Huron. Given the apparent convergence on Great Lakes form, we labeled this form blackfin. Here, we test the hypothesis that nigripinnis may have colonized this area from the Great Lakes as a distinct lineage. It would then represent a relict occurrence of the historical diversity of Great Lakes ciscoes. Alternatively, blackfin could have evolved in situ in several lakes. We captured more than 600 individuals in the benthic or pelagic habitat in 14 lakes in or near Algonquin Provincial Park (Ontario, Canada). Fish were compared based on habitat, morphology, and genetic variation at 6,676 SNPs. Contrary to our expectations, both cisco and blackfin belonged to an Atlantic lineage that colonized the area from the east, not from the Great Lakes. Sympatric cisco and blackfin were closely related while fish from different lakes were genetically differentiated, strongly suggesting the repeated in situ origin of each form. Across lakes, there was a continuum of ecological, morphological, and genetic differentiation that could be associated with alternative resources and lake characteristics. This study uncovers a new component of cisco diversity in inland lakes of Canada that evolved independently from ciscoes of the Laurentian Great lakes. The diversity of cisco revealed in this study and across their Canadian range presents a challenge for designating conservation units at the intraspecific level within the framework of the Committee on the Status of Endangered Wildlife in Canada (COSEWIC).

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Section: Morphologymentioning

confidence: 99%

Evolution and diversity of two cisco forms in an outlet of glacial Lake Algonquin

Piette‐Lauzière

Bell

Ridgway

et al. 2019

Ecology and Evolution

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“…To reduce both directional and nondirectional measurement error, the full dataset comprising four landmark configurations for each specimen has been first subjected to the procedure described by Valentin et al (2008), and then the resulting coordinates of each specimen (now adjusted for body arching) were averaged to obtain a single landmark configuration for each specimen. Average centroid size measures were also computed for each specimen.…”

Section: Data Gathering and Dataset Preparationmentioning

confidence: 99%

Geographical and morphological variation within and between colour phases inCoris julis(L. 1758), a protogynous marine fish

Fruciano

Tigano

Ferrito

2011

Biological Journal of the Linnean Society

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The possible differences between sexes in patterns of morphological variation in geographical space have been explored only in gonochorist freshwater species. We explored patterns of body shape variation in geographical space in a marine sequential hermaphrodite species, Coris julis (L. 1758), analyzing variation both within and between colour phases, through the use of geometric morphometrics and spatially-explicit statistical analyses. We also tested for the association of body shape with two environmental variables: temperature and chlorophyll a concentration, as obtained from time-series of satellite-derived data. Both colour phases showed a significant morphological variation in geographical space and patterns of variation divergent between phases. Although the morphological variation was qualitatively similar, individuals in the initial colour phase showed a more marked variation than individuals in the terminal phase. Body shape showed a weak but significant correlation with environmental variables, which was more pronounced in primary specimens.

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“…To minimize the possible effect of systematic error, the fish were photographed in random order. There is also the possibility of an arching effect because of the non-rigid structure of the fish (for example, Albert et al, 2008;Valentin et al, 2008). In previous studies of threespine stickleback body shape, the effect of bending on landmark data has been eliminated by removing the eigenvectors (with their associated eigenvalues) that have described vertical arching of the body (Albert et al, 2008;Sharpe et al, 2008).…”

Section: Data Acquisitionmentioning

confidence: 99%

Genetic basis of sexual dimorphism in the threespine stickleback Gasterosteus aculeatus

2010

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Sexual dimorphism (SD) in morphological, behavioural and physiological features is common, but the genetics of SD in the wild has seldom been studied in detail. We investigated the genetic basis of SD in morphological traits of threespine stickleback (Gasterosteus aculeatus) by conducting a large breeding experiment with fish from an ancestral marine population that acts as a source of morphological variation. We also examined the patterns of SD in a set of 38 wild populations from different habitats to investigate the relationship between the genetic architecture of SD of the marine ancestral population in relation to variation within and among natural populations.The results show that genetic architecture in terms of heritabilities, additive genetic variances and covariances (as well as correlations) is very similar in the two sexes in spite of the fact that many of the traits express significant SD. Furthermore, population differences in threespine stickleback body shape and armour SD appear to have evolved despite constraints imposed by genetic architecture. This implies that constraints for the evolution of SD imposed by strong genetic correlations are not as severe and absolute as commonly thought.

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Arching effect on fish body shape in geometric morphometric studies

Cited by 81 publications

References 26 publications

Evolution and diversity of two cisco forms in an outlet of glacial Lake Algonquin

Evolution and diversity of two cisco forms in an outlet of glacial Lake Algonquin

Geographical and morphological variation within and between colour phases inCoris julis(L. 1758), a protogynous marine fish

Genetic basis of sexual dimorphism in the threespine stickleback Gasterosteus aculeatus

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