Trends in the sand: Directional evolution in the shell shape of recessing scallops (Bivalvia: Pectinidae)

Sherratt, Emma; Alejandrino, Alvin; Kraemer, Andrew C.; Serb, Jeanne M.; Adams, Dean C.

doi:10.1111/evo.12995

Cited by 37 publications

(71 citation statements)

References 78 publications

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“…We used 30 fossils to constrain the age of nodes through assigning node priors, details of which are in Sherratt et al . (: table 2).…”

Section: Methodsmentioning

confidence: 99%

“…A total of 933 specimens from 121 species were used in this study and were selected to represent a wide range of taxa displaying all six ecomorphs exhibited in the Pectinidae (data from Sherratt et al ., ; natural history museums listed in Table S1 and Acknowledgments. For each specimen, shell morphology was quantified using geometric morphometric methods (Bookstein, ; Mitteroecker & Gunz, ; Adams et al ., ).…”

Section: Methodsmentioning

confidence: 99%

“…The method is identical to Sherratt et al . () and uses a total of 202 landmarks and semilandmarks to characterize shell shape (Fig. ).…”

Section: Methodsmentioning

confidence: 99%

“…These methods utilize the locations of landmark coordinates as the basis of shell shape quantification. The method is identical to Sherratt et al (2016) and uses a total of 202 landmarks and semilandmarks to characterize shell shape ( Fig. 1).…”

Section: Specimen Selection and Morphological Characterizationmentioning

confidence: 99%

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Phylogenetic convergence and multiple shell shape optima for gliding scallops (Bivalvia: Pectinidae)

Serb

Sherratt

Alejandrino

et al. 2017

J of Evolutionary Biology

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An important question in evolutionary biology is how often, and to what extent, do similar ecologies elicit distantly related taxa to evolve towards the same phenotype? In some scenarios, the repeated evolution of particular phenotypes may be expected, for instance when species are exposed to common selective forces that result from strong functional demands. In bivalved scallops (Pectinidae), some species exhibit a distinct swimming behaviour (gliding), which requires specific biomechanical attributes to generate lift and reduce drag during locomotive events. Further, a phylogenetic analysis revealed that gliding behaviour has independently evolved at least four times, which raises the question as to whether these independent lineages have also converged on a similar phenotype. Here, we test the hypothesis that gliding scallops display shell shape convergence using a combination of geometric morphometrics and phylogenetic comparative methods that evaluate patterns of multivariate trait evolution. Our findings reveal that the gliding species display less morphological disparity and significant evolutionary convergence in morphospace, relative to expectations under a neutral model of Brownian motion for evolutionary phenotypic change. Intriguingly, the phylomorphospace patterns indicate that gliding lineages follow similar evolutionary trajectories to not one, but two regions of morphological space, and subsequent analyses identified significant differences in their biomechanical parameters, suggesting that these two groups of scallops accomplish gliding in different ways. Thus, whereas there is a clear gliding morphotype that has evolved convergently across the phylogeny, functionally distinct morphological subforms are apparent, suggesting that there may be two optima for the gliding phenotype in the Pectinidae.

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“…We used 30 fossils to constrain the age of nodes through assigning node priors, details of which are in Sherratt et al . (: table 2).…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…The method is identical to Sherratt et al . () and uses a total of 202 landmarks and semilandmarks to characterize shell shape (Fig. ).…”

Section: Methodsmentioning

confidence: 99%

Section: Specimen Selection and Morphological Characterizationmentioning

confidence: 99%

See 2 more Smart Citations

Phylogenetic convergence and multiple shell shape optima for gliding scallops (Bivalvia: Pectinidae)

Serb

Sherratt

Alejandrino

et al. 2017

J of Evolutionary Biology

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show abstract

“…Recently, geometric morphometric analysis has been increasingly employed in bivalve studies with different objectives: recognition of phenotypic fishery stocks (Márquez, Robledo, Escati Peñaloza, & Van der Molen, 2010;Palmer, Pons, & Linde, 2004;Rufino et al, 2012), paleoenvironmental and paleoclimate reconstruction (Aguirre, Perez, & Sirch, 2006;Aguirre, Richiano, Álvarez, & Farinati, 2016;Gordillo, Márquez, Cárdenas, & Zubimendia, 2011), and analysis of evolutionary processes (Schneider, Fürsich, Schulz-Mirbach, & Werner, 2010;Sherratt, Alejandrino, Kraemer, Serb, & Adams, 2016;Tang & Pantel, 2005). In addition, geometric morphometrics have been used to study ontogenetic shape changes (Márquez, Amoroso, Gowland Sainz, & Van der, 2010) and to evaluate the invasive success of introduced freshwater species (Sousa et al, 2007).…”

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confidence: 99%

Does shell shape variation play a role in conservation of the long‐lived freshwater bivalve Diplodon chilensis (Bivalvia, Hyriidae)?

et al. 2017

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Freshwater bivalves of the order Unionoida display an uncommon phenotypic plasticity with high interpopulation and intrapopulation morphological variability, which could be advantageous for coping with habitat modifications. However, unionoids have suffered a marked population decline in different parts of the world in the last decades. A decline in some populations of the South American long-lived freshwater mussel Diplodon chilensis as a consequence of habitat deterioration has recently been recorded. Ontogenetic allometry and shape variation in shells of D. chilensis from 2 different sites, Paimun lake and Chimehuin river, North Patagonia, Argentina, have been studied. For these purposes, geometric morphometric methods were used. Shell shape shows differences between sites, which the shells from Chimehuin river show less intrapopulation variability; are more elongated, with the anterior part extended upwards and the posterior part downwards; and show a steeper anterior curvature at the umbo compared to those from Paimún lake. These characteristics make shell shape more streamlined to withstand river current.Furthermore, the extended posterior-ventral part in river shells coincides with higher foot weight that would improve anchoring to the river rocky-sandy substrate. River shells present a bounded eco-morphotype whereas the higher variability of lake shells includes the "river eco-morphotype."Growth is allometric throughout life in both sites and is not sex-dependent. The success of river repopulation programmes using mussels from lake populations may be increased by transplanting selected individuals that show "river eco-morphotype."

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Phylomorphometrics reveal ecomorphological convergence in pea crab carapace shapes (Brachyura, Pinnotheridae)

Gier

2023

Ecology and Evolution

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Most pea crab species (Crustacea: Decapoda: Brachyura: Pinnotheridae) are characterized by their symbiotic lifestyle, often thought to be obligate parasites or commensals (Baeza, 2015). The degree of host dependency is, however, still unclear for most species. The species within the subfamily Pinnotherinae are known to be endo-or ectosymbiotic inhabitants of bivalves, polyplacophorans, gastropods, holothurians, echinoids, brachiopods, and ascidians (de Gier & Becker, 2020). Although some species have a broad host spectrum spanning across various phyla, most species of Pinnotherinae are considered to be specialists. This means that these species are only inhabiting specific genera or orders within a host phylum. Several species of the two smaller subfamilies (Pinnixinae and Pinnixulalinae) are also found in bivalve, or in/on holothurian hosts in their adult stages, but most are considered to be free-living or tube/ burrow-dwelling, sharing this habitat with a worm, ghost shrimp, or mud lobster as a host (inquilism; see Palacios Theil et al., 2016;

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Trends in the sand: Directional evolution in the shell shape of recessing scallops (Bivalvia: Pectinidae)

Cited by 37 publications

References 78 publications

Phylogenetic convergence and multiple shell shape optima for gliding scallops (Bivalvia: Pectinidae)

Phylogenetic convergence and multiple shell shape optima for gliding scallops (Bivalvia: Pectinidae)

Does shell shape variation play a role in conservation of the long‐lived freshwater bivalve Diplodon chilensis (Bivalvia, Hyriidae)?

Phylomorphometrics reveal ecomorphological convergence in pea crab carapace shapes (Brachyura, Pinnotheridae)

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