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

Aguilar-Medrano, Rosalía

doi:10.1163/15707563-00002407

Cited by 7 publications

(12 citation statements)

References 42 publications

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“…1 ) is a major morphological trend across teleost species [3] – [5] . Studies on overall body shape or shape of part of the body (often part of the cranium), have found that elongation is the principal axis of shape diversity within clades of Pomacentridae [7] – [10] , Balistidae [11] , Cichlidae [12] , Anguilliformes [13] , [14] and Labridae [15] . A major role for elongation has even been described several times intraspecifically (e.g.…”

Section: Introductionmentioning

confidence: 99%

A Morphospace for Reef Fishes: Elongation Is the Dominant Axis of Body Shape Evolution

Claverie¹,

2014

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Tropical reef fishes are widely regarded as being perhaps the most morphologically diverse vertebrate assemblage on earth, yet much remains to be discovered about the scope and patterns of this diversity. We created a morphospace of 2,939 species spanning 56 families of tropical Indo-Pacific reef fishes and established the primary axes of body shape variation, the phylogenetic consistency of these patterns, and whether dominant patterns of shape change can be accomplished by diverse underlying changes. Principal component analysis showed a major axis of shape variation that contrasts deep-bodied species with slender, elongate forms. Furthermore, using custom methods to compare the elongation vector (axis that maximizes elongation deformation) and the main vector of shape variation (first principal component) for each family in the morphospace, we showed that two thirds of the families diversify along an axis of body elongation. Finally, a comparative analysis using a principal coordinate analysis based on the angles among first principal component vectors of each family shape showed that families accomplish changes in elongation with a wide range of underlying modifications. Some groups such as Pomacentridae and Lethrinidae undergo decreases in body depth with proportional increases in all body regions, while other families show disproportionate changes in the length of the head (e.g., Labridae), the trunk or caudal region in all combinations (e.g., Pempheridae and Pinguipedidae). In conclusion, we found that evolutionary changes in body shape along an axis of elongation dominates diversification in reef fishes. Changes in shape on this axis are thought to have immediate implications for swimming performance, defense from gape limited predators, suction feeding performance and access to some highly specialized habitats. The morphological modifications that underlie changes in elongation are highly diverse, suggesting a role for a range of developmental processes and functional consequences.

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Section: Introductionmentioning

confidence: 99%

A Morphospace for Reef Fishes: Elongation Is the Dominant Axis of Body Shape Evolution

Claverie¹,

2014

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“…The largest source of morphological variation observed in the damselfish locomotor system was related to the rostro‐caudal elongation of the fish body, a major trend in shape diversity in reef fishes (Ward and Mehta, ; Aguilar‐Medrano et al, ; Aguilar‐Medrano, ; Claverie and Wainwright, ). Although, it is interesting to note that the three studied ecological variables do not show significant relationships with the first axis of variation but instead with the secondary axes.…”

Section: Discussionmentioning

confidence: 99%

“…While the ecological variables studied in our analysis are highly related to locomotion, they also influence feeding behavior. For example, deep‐bodies species with short caudal peduncles were typically associated with slower, more maneuverable swimmers (Bartol et al, ; Fulton, ; Aguilar‐Medrano, ). In turn, these characteristics were associated with being territorial and herbivorous (Frédérich et al, ; Cooper and Westneat, ; Aguilar‐Medrano et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…In turn, these characteristics were associated with being territorial and herbivorous (Fr ed erich et al, 2008;Cooper and Westneat, 2009;Aguilar-Medrano et al, 2011). Similarly, results showed that elongated species with longer caudal peduncles were associated with faster, more efficient swimming (Videler, 1993;Fulton, 2007;Aguilar-Medrano, 2013); these species were typically schooling and mostly zooplanktivorous (Fr ed erich et al, 2008;Cooper and Westneat, , 2011). The strong connections observed between locomotion and feeding in damselfishes (see above) is similarly seen in other fishes, such as the Labridae (Collar et al, 2008) suggesting that constraints of swimming and feeding in an aquatic medium can have similar effects across distantly related taxa.…”

Section: Modularity and Ecological Constraints On Locomotor System Shmentioning

confidence: 97%

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Modular diversification of the locomotor system in damselfishes (Pomacentridae)

Aguilar-Medrano

Frederich

Barber³

2016

Journal of Morphology

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As fish move and interact with their aquatic environment by swimming, small morphological variations of the locomotor system can have profound implications on fitness. Damselfishes (Pomacentridae) have inhabited coral reef ecosystems for more than 50 million years. As such, habitat preferences and behavior could significantly constrain the morphology and evolvability of the locomotor system. To test this hypothesis, we used phylogenetic comparative methods on morphometric, ecological and behavioral data. While body elongation represented the primary source of variation in the locomotor system of damselfishes, results also showed a diverse suite of morphological combinations between extreme morphologies. Results show clear associations between behavior, habitat preferences, and morphology, suggesting ecological constraints on shape diversification of the locomotor system. In addition, results indicate that the three modules of the locomotor system are weakly correlated, resulting in versatile and independent characters. These results suggest that Pomacentridae is shape may result from the interaction between (1) integrated parts of morphological variation that maintain overall swimming ability and (2) relatively independent parts of the morphology that facilitate adaptation and diversification. J. Morphol. 000:000-000,

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“…Among damselfish species, there is a strong relationship between habitat use, feeding, behavior, and morphology (Emery 1973;Fulton 2007;Frédérich et al 2008Frédérich et al , 2013Aguilar-Medrano 2013Aguilar-Medrano et al 2011, 2016. The ecological conditions that each species are exposed to since their separation by the Isthmus of Panama may have shaped their niche and morphology over time.…”

Section: Introductionmentioning

confidence: 99%

Ecomorphological trajectories of reef fish sister species (Pomacentridae) from both sides of the Isthmus of Panama

Aguilar-Medrano

2017

Zoomorphology

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The vicariance model of biogeography focuses on allopatric speciation through fragmentation from an ancestral biota via a barrier that interrupts gene flow between populations. The evolutionary processes that occur over time in sister species on each side of the vicariance event influence their traits by a compromise between divergence and conservatism. The eastern Pacific and the Caribbean Sea were separated by the Isthmus of Panama ~ 3-6 Mya and allopatric speciation occurred on either side of the isthmus. Differences in ecological conditions on each side of the Isthmus of Panama separating the sister species may have shaped their niches and morphologies over evolutionary time. The objectives of this study were to: (1) analyze the variation in niche, morphology, and size in each pair of sister damselfish species on both sides of the Isthmus of Panama, (2) determine whether these variables show specific patterns on each side of the isthmus, and (3) determine whether these variables are correlated through evolution. The results showed no relationship between morphology and niche, however, size was related to both niche and morphology. Sister damselfish species on either side of the Isthmus of Panama differ in terms of niche, morphology, and size. Nevertheless, they also show similarities, indicating environmental constraints and conservatism. This study describes a model in which adaptation or divergence and conservatism shaped the evolution of sister damselfish species on both sides of the Isthmus of Panama. These mechanisms are fundamental to population biology, and they act in opposite directions.

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

Cited by 7 publications

References 42 publications

A Morphospace for Reef Fishes: Elongation Is the Dominant Axis of Body Shape Evolution

A Morphospace for Reef Fishes: Elongation Is the Dominant Axis of Body Shape Evolution

Modular diversification of the locomotor system in damselfishes (Pomacentridae)

Ecomorphological trajectories of reef fish sister species (Pomacentridae) from both sides of the Isthmus of Panama

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