Body shape evolution of Chromis and Azurina species (Percifomes, Pomacentridae) of the eastern Pacific

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Chromis is a circumglobal tropical and temperate genus with over 84 species of damselfishes. Studies based in osteological and molecular data have cited the relationship between Azurina and Chromis in the eastern Pacific. The main objectives of the study are: (1) to characterize size and shape in all Chromis and Azurina species of the eastern Pacific, (2) explore the phylogenetic signal of external morphology, and (3) present a hypothesis of the diversification process of this group. According to the results, there is no significant relationship between size and shape. The variation in body shape among all species is related to the height of the trunk, position of the snout and eye, and length of the caudal peduncle. The main morphologic variation between Azurina and Chromis is the degree of elongation of the body. Both Azurina species are closely related to C. punctipinnis and C. atrilobata. The morphological pattern of Azurina integrated it into Chromis. The phylogenetic pattern found by geometric morphometric analyses presented a high similarity with previous results based on molecular data. Phylogeny recovered two main clades, slender-bodied and deep-bodied species. This pattern of morphometric variation is closely related to exploitation of two different reef environments.

Body shape evolution of Chromis and Azurina species (Percifomes, Pomacentridae) of the eastern Pacific

in Animal Biology

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Figures

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    Distribution of Chromis and Azurina along the coasts and islands of the eastern Pacific. This figure is published in colour in the online version.

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    Landmarks used for geometric morphometric analyses: (1) snout; (2) eye; (3) supraoccipital crest; (4) origin of the dorsal fin; (5) posterior extreme of the dorsal fin; (6, 7 and 8) superior caudal peduncle (origin, waist and posterior extreme); (9, 10, 11) inferior caudal peduncle (origin, waist and anterior extremes); (12) anal fin origin; (13) pelvic fin origin; (14) pectoral fin down origin; (15) pectoral fin above origin; (16) operculum angle; and (17) upper margin of the operculum.

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    Principal component analysis (PCA). Symbols: cross: C. alta; square: C. atrilobata; fill square: C. crusma; equis: C. intercrusma; circle: C. limbaughi; diamond: C. meridiana; asterisk: C. punctipinnis; triangle: A. eupalama; fill triangle: A. hirundo. Black left square: Chromis species. Greenfield & Woods (1980) classification: (A) deep-bodied species and (B) slender-bodied species. Red oval in the right side of the graph (C): Azurina species. Grids represent the morphologic extreme of PC1. This figure is published in colour in the online version.

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    Canonical variables analysis (CVA): CV1 versus CV2. Symbols: square: C. alta and C. limbaughi; fill square: C. atrilobata; circle: C. crusma; fill circle: C. intercrusma; triangle: C. meridiana; fill triangle: C. punctipinnis; asterisk: A. eupalama; cross: A. hirundo. Grids represent the morphologic extreme of each axis.

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    UPGMA phenogram of morphological data, using Mahalanobis distance. Index of copheneric correlation: 0.621. Right: Species images are added to help to visualize the morphological pattern. This figure is published in colour in the online version.

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    Morphometric phylogeny of Chromis-Azurina species of the eastern Pacific. Onle the most important grids were included in the morphometric tree. Grids of the internal nodes were calculated by parsimony in TNT (see text).

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