Foundations of Morphometrics

Bookstein, Fred L.

doi:10.1146/annurev.es.13.110182.002315

Cited by 159 publications

(105 citation statements)

References 35 publications

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“…Condition factor K has been associated to other factors, including fish abundance and competition in ecosystems (Balirwa 1998;Bwanika et al 2004;Otieno et al 2013). For example, Balirwa (1998) reported that with declining fish populations in Lakes Kyoga and Victoria, less competition for food resources could have led to improvement of K values.…”

Section: Discussionmentioning

confidence: 99%

“…For example, Balirwa (1998) reported that with declining fish populations in Lakes Kyoga and Victoria, less competition for food resources could have led to improvement of K values. The remarkable low K values observed under aquaculture might be linked to stress resulting from generally poor welfare of the fish under such conditions, like water quality, limited and low quality food, stock size and competition, among others.…”

Section: Discussionmentioning

confidence: 99%

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Anthropogenic impacts on the contextual morphological diversification and adaptation of Nile tilapia (Oreochromis niloticus, L. 1758) in East Africa

et al. 2018

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Nile tilapia occurs naturally in East Africa where it's an economically important species. Many of the natural populations of Nile tilapia have been affected by anthropogenic activities including translocations, associated with programmes aimed at enhancing capture fisheries and aquaculture productivity. Using geometric morphometric analyses, we tested the hypothesis that such anthropogenic activities have augmented admixture among natural populations of Nile tilapia and influenced the geographical distribution of morphological variation within the species. Our expectation was that Nile tilapia shape divergent might be consistent with reportedly anthropogenic activities in nonnative environments. To test this hypothesis, we analyzed the shapes of 490 individuals from thirteen populations; three farms, six natives and four nonnative natural populations. Our analysis revealed that the most pronounced shape diversification was observed in seven populations; three nonnatives (Victoria, Kyoga and Sindi farm) and four natives (Albert, River Nile, George and Turkana). The features responsible for the observed morphotypes were mainly related to the orientation of the anterior region of the fish and may be due to diversifying selection in response to new environmental pressures (for nonnative populations), admixture or drift. Shape change in the nonnative high-altitude populations was unexpectedly conserved, suggesting recent introductions which may have not resulted in admixture or there was strong selection against change in the traits measured. On the other hand, the recorded morphotypic clusters explained the possible genetic link to their putative ancestral home. Our results were partially consistent with our prediction that the nonnative populations exhibited divergent morphotypes. We recommend further investigations with molecular genetics for followup of these findings.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Anthropogenic impacts on the contextual morphological diversification and adaptation of Nile tilapia (Oreochromis niloticus, L. 1758) in East Africa

et al. 2018

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“…Body shape represents an important set of animal characters that are used for particular comparative purposes, such as studies of taxonomy, ecology, evolution, growth and presence of abnormalities (BOOKSTEIN 1982, LESTREL 2000, ZELDITCH et al 2004. In taxonomic research morphometrics can be used to provide new sets of characters when regular qualitative morphology is not enough to distinguish taxa.…”

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confidence: 99%

A morphometric analysis of Eunice Cuvier (Annelida, Polychaeta) species

Costa-Paiva

Paiva

2007

Rev. Bras. Zool.

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Morphology has been the subject of several studies in Eunice specially in the context of the taxonomy and evolutionary relationships of taxa within this genus. In this study we opt for a morphometric approach comparing five species of Eunice to assess if it was possible to delimitate them by shape variables. The morphology of E.fucata, E.insularis, E. cf. ornata, E.rubra, and Eunice sp. was compared using traditional morphometric analysis of 16 measured variables. After removing the size-effect, a Canonical Variates Analysis applied to morphometric variables was able to discriminate all species. In CV1 two major groups of species were discriminated: E.fucata/E.insularis and E. cf. ornata/E.rubra/Eunice sp. CV2 strongly discriminated all species, with E. cf. ornatawith higher scores and E.rubra with lower ones. The characters that differentiate the species were the relative size of antennae, peristomium and anteriormost setigers. This study also demonstrated that peristomium width and palps length were the best variables for body size estimation in Eunice, since they were highly correlated to the size-estimator. Through morphometric analysis it was possible to delimitate species and choose diagnostic characters for the genus Eunice, a result likely to be valid for other polychaete species.

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“…Informações sobre a forma do corpo, obtidas através de estudos morfométricos, têm sido empregadas em estudos de taxonomia, ecologia, evolução e dinâmica populacional de diversos organismos (Bookstein, 1982;Rohlf & Marcus, 1993). Segundo Zelditch et al (2004), morfometria é a análise da forma corporal em relação ao tamanho por meio de métodos numéricos, sendo utilizada na interpretação e comparação dos padrões de variação de caracteres quantitativos entre si.…”

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