A morphometric dive into fish diversity

Caillon, Florian; Bonhomme, Vincent; Möllmann, Christian; Frelat, Romain

doi:10.1002/ecs2.2220

Cited by 21 publications

(17 citation statements)

References 40 publications

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“…2014; Caillon et al. 2018). Prior to the eFa, tests were made to determine if landmarks were necessary to constrain the position of the outlines to avoid alignment problems; if so, landmarked outlines were subjected to a Full Generalized Procrustes alignment in Momocs before the eFa.…”

Section: Methodsmentioning

confidence: 99%

“…styles (Reginato and Michelangeli 2016). The floral images were imported into R and the closed curve shapes from the outlines were described as periodic functions that transform and decompose each into a series of harmonics (Bonhomme et al 2014;Caillon et al 2018). Prior to the eFa, tests were made to determine if landmarks were necessary to constrain the position of the outlines to avoid alignment problems; if so, landmarked outlines were subjected to a Full Generalized Procrustes alignment in Momocs before the eFa.…”

Section: Morphometric Analyses Of Corolla Anther and Style Shape Inmentioning

confidence: 99%

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Pollinator shifts, contingent evolution, and evolutionary constraint drive floral disparity in Salvia (Lamiaceae): Evidence from morphometrics and phylogenetic comparative methods

et al. 2020

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Switches in pollinators have been argued to be key drivers of floral evolution in angiosperms. However, few studies have tested the relationship between floral shape evolution and switches in pollination in large clades. In concert with a dated phylogeny, we present a morphometric analysis of corolla, anther connective, and style shape across 44% of nearly 1000 species of Salvia (Lamiaceae) and test four hypotheses of floral evolution. We demonstrate that floral morphospace of New World (NW) Salvia is largely distinct from that of Old World (OW) Salvia and that these differences are pollinator driven; shifts in floral morphology sometimes mirror shifts in pollinators; anther connectives (key constituents of the Salvia staminal lever) and styles co‐evolved from curved to linear shapes following shifts from bee to bird pollination; and morphological differences between NW and OW bee flowers are partly the legacy of constraints imposed by an earlier shift to bird pollination in the NW. The distinctive staminal lever in Salvia is a morphologically diverse structure that has evolved in concert with both the corolla and style, under different pollinator pressures, and in contingent fashion.

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Section: Methodsmentioning

confidence: 99%

Section: Morphometric Analyses Of Corolla Anther and Style Shape Inmentioning

confidence: 99%

Pollinator shifts, contingent evolution, and evolutionary constraint drive floral disparity in Salvia (Lamiaceae): Evidence from morphometrics and phylogenetic comparative methods

et al. 2020

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“…Our study aims to answer the latter question for the copepod community during ice break up in an Arctic environment using a statistical description of body shapes (“morphometrics,” Caillon et al 2018). Sea ice melt is the primary driver of the spring phytoplankton bloom (Perrette et al 2011).…”

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confidence: 99%

Trait‐based approach using in situ copepod images reveals contrasting ecological patterns across an Arctic ice melt zone

Vilgrain

Maps

Picheral

et al. 2021

Limnology & Oceanography

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Imaging techniques are increasingly used in ecology studies, producing vast quantities of data. Inferring functional traits from individual images can provide original insights on ecosystem processes. Morphological traits are, as other functional traits, individual characteristics influencing an organism's fitness. We measured them from in situ image data to study an Arctic zooplankton community during sea ice break-up. Morphological descriptors (e.g., area, lightness, complexity) were automatically measured on 28,000 individual copepod images from a high-resolution underwater camera deployed at more than 150 sampling sites across the ice-edge. A statisticallydefined morphological space allowed synthesizing morphological information into interpretable and continuous traits (size, opacity, and appendages visibility). This novel approach provides theoretical and methodological advantages because it gives access to both inter-and intra-specific variability by automatically analyzing a large dataset of individual images. The spatial distribution of morphological traits revealed that large copepods are associated with ice-covered waters, while open waters host smaller individuals. In those ice-free waters, copepods also seem to feed more actively, as suggested by the increased visibility of their appendages. These traits distributions are likely explained by bottom-up control: high phytoplankton concentrations in the well-lit open waters encourages individuals to actively feed and stimulates the development of small copepod stages. Furthermore, copepods located at the ice edge were opaquer, presumably because of full guts or an increase in red pigmentation. Our morphological trait-based approach revealed ecological patterns that would have been inaccessible otherwise, including color and posture variations of copepods associated with ice-edge environments in Arctic ecosystems. Functional traits are any features-morphological, physiological, etc-measurable at the individual-level and affecting the fitness of the organism (Violle et al. 2007). They can be classified according to the ecological function that they influence, such as feeding, growth, reproduction, and survival (Litchman et al. 2013). Trait-based approaches appeared in plant ecology in the 70s (Grime 1974) and stated being used by aquatic ecologists in the early 2000s (Willby et al. 2000; Usseglio-Polatera et al. 2000; Benedetti et al. 2016; Martini et al. (in press)). Trait-based analyses are relevant in community ecology because an individual's set of traits given environment determines its success (Violle et al. 2007). Ecological interactions (predation, mutualism, etc.) happen between individuals, not between taxonomic groups. Therefore, using trait composition can simplify the analysis of ecosystem complexity by focusing on a few characteristics transcending taxonomic distinctions and impacting ecological strategies (Litchman et al. 2013). By studying the composition and distribution of individual traits in an ecosystem, its structure and dominant proc...

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“…In the future, more advanced morphometric analyses may be called upon to contribute to Bluenose Shiner conservation. Use of traditional morphometrics, as in this study, does not allow for the use of modern technologies to reconstruct the original shape of a fish (Caillon, Bonhomme, Mollmann, & Frelat, ). Nonetheless, these morphometrics could be utilized to make general comparisons within species.…”

Section: Discussionmentioning

confidence: 99%

Morphological and gonadal assessments from historical collections of Bluenose Shiners Pteronotropis welaka

Fetterman

Green

2019

J Appl Ichthyol

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Management and conservation have begun to rely on supplemental information to make appropriate decisions. In organisms with little available information, preserved specimens may be particularly important for researchers to continue their role in the management process. Bluenose Shiners are a minnow species that can benefit from such analyses as they are of conservation concern across their native range in the Southeastern United States. To supplement conservation, the objectives were to: (a) quantify sexual dimorphism through a comprehensive morphological analysis, (b) approximate peak spawning condition of males and females through GSI measurements over the anticipated spawning season, and (c) utilize female gonad histology to refine conclusions regarding spawning condition from GSI. Historical collections of Bluenose Shiners obtained from the Tulane University Biodiversity Research Institute were used to conduct morphological and gonadal analyses. While males expressed all morphometrics to a greater degree, male dorsal and anal fin length appears to be the most distinguished characteristic beginning at a total length of approximately 45 mm. GSI displayed peaks in the samples from April 21, 1957 and June 1, 1968; female GSI from Black Creek, MS in April, May, and June of 1986 suggested a peak in late May. Gonad histology showed a progression towards final oocyte maturation through May to early June, via relative prevalence of stage IV and absence of stage I oocytes. This information can be used to supplement future morphometric analyses and reproductive studies performed on Bluenose Shiners or other fish species.

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A morphometric dive into fish diversity

Cited by 21 publications

References 40 publications

Pollinator shifts, contingent evolution, and evolutionary constraint drive floral disparity in Salvia (Lamiaceae): Evidence from morphometrics and phylogenetic comparative methods

Pollinator shifts, contingent evolution, and evolutionary constraint drive floral disparity in Salvia (Lamiaceae): Evidence from morphometrics and phylogenetic comparative methods

Trait‐based approach using in situ copepod images reveals contrasting ecological patterns across an Arctic ice melt zone

Morphological and gonadal assessments from historical collections of Bluenose Shiners Pteronotropis welaka

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