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Boelter T, Moreira LFB, Pires MM, Stenert C, Maltchik L. Growing a fin: wetland and upland effects on tadpole morphology of Scinax squalirostris (Anura: Hylidae). ZOOMORPHOLOGY 2022. [DOI: 10.1007/s00435-022-00557-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Fruciano C, Schmidt D, Ramírez Sanchez MM, Morek W, Avila Valle Z, Talijančić I, Pecoraro C, Schermann Legionnet A. Tissue preservation can affect geometric morphometric analyses: a case study using fish body shape. Zool J Linn Soc 2019. [DOI: 10.1093/zoolinnean/zlz069] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Abstract
In geometric morphometrics, the extent of variation attributable to non-biological causes (i.e. measurement error) is sometimes overlooked. The effects of this variation on downstream statistical analyses are also largely unknown. In particular, it is unclear whether specimen preservation induces substantial variation in shape and whether such variation affects downstream statistical inference. Using a combination of empirical fish body shape data and realistic simulations, we show that preservation introduces substantial artefactual variation and significant non-random error (i.e. bias). Most changes in shape occur when fresh fish are frozen and thawed, whereas a smaller change in shape is observed when frozen and thawed fish are fixed in formalin and transferred to ethanol. Surprisingly, we also show that, in our case, preservation produces only minor effects on three downstream analyses of shape variation: classification using canonical variate analysis, permutation tests of differences in means and computations of differences in mean shape between groups. Even mixing of differently preserved specimens has a relatively small effect on downstream analyses. However, we suggest that mixing fish with different preservation should still be avoided and discuss the conditions in which this practice might be justified.
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Affiliation(s)
- Carmelo Fruciano
- Institut de Biologie de l’Ecole Normale Supérieure (IBENS), Ecole Normale Supérieure, CNRS, INSERM, PSL Université Paris, Paris, France
| | - Dominik Schmidt
- Department of Modeling and Systems Analysis, Hochschule Geisenheim University, Geisenheim, Germany
| | - Marcia Maria Ramírez Sanchez
- Laboratorio de Biometría y Biología Pesquera, Facultad de Estudios Superiores Zaragoza, UNAM, Mexico City, Mexico
| | - Witold Morek
- Institute of Zoology and Biomedical Research, Jagiellonian University, Kraków, Poland
| | - Zamira Avila Valle
- Laboratorio de Biometría y Biología Pesquera, Facultad de Estudios Superiores Zaragoza, UNAM, Mexico City, Mexico
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Chiozzi G, Stiassny MLJ, de Marchi G, Lamboj A, Fasola M, Fruciano C. A diversified kettle of fish: phenotypic variation in the endemic cichlid genus Danakilia of the Danakil Depression of northeastern Africa. Biol J Linn Soc Lond 2018. [DOI: 10.1093/biolinnean/bly085] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Giorgio Chiozzi
- Dipartimento di Scienze della Terra e dell’Ambiente, Università degli Studi di Pavia, Pavia, Italy
- Museo di Storia Naturale di Milano, Corso Venezia, Milano, Italy
| | - Melanie L J Stiassny
- Department of Ichthyology, American Museum of Natural History, New York, NY, USA
| | - Giuseppe de Marchi
- Dipartimento di Scienze della Terra e dell’Ambiente, Università degli Studi di Pavia, Pavia, Italy
| | - Anton Lamboj
- Department of Integrative Zoology, University of Vienna, UZA, Vienna, Austria
| | - Mauro Fasola
- Dipartimento di Scienze della Terra e dell’Ambiente, Università degli Studi di Pavia, Pavia, Italy
| | - Carmelo Fruciano
- School of Earth, Environmental and Biological Sciences, Queensland University of Technology, Brisbane, Queensland, Australia
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Raffini F, Fruciano C, Meyer A. Morphological and genetic correlates in the left–right asymmetric scale-eating cichlid fish of Lake Tanganyika. Biol J Linn Soc Lond 2018. [DOI: 10.1093/biolinnean/bly024] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Francesca Raffini
- Lehrstuhl für Zoologie und Evolutionsbiologie, Department of Biology, University of Konstanz, Universitätsstrasse, Konstanz, Germany
- International Max Planck Research School (IMPRS) for Organismal Biology, University of Konstanz, Konstanz, Germany
| | - Carmelo Fruciano
- Lehrstuhl für Zoologie und Evolutionsbiologie, Department of Biology, University of Konstanz, Universitätsstrasse, Konstanz, Germany
- School of Earth, Environmental and Biological Sciences, Queensland University of Technology, Brisbane, QLD, Australia
| | - Axel Meyer
- Lehrstuhl für Zoologie und Evolutionsbiologie, Department of Biology, University of Konstanz, Universitätsstrasse, Konstanz, Germany
- International Max Planck Research School (IMPRS) for Organismal Biology, University of Konstanz, Konstanz, Germany
- Radcliffe Institute for Advance Study, Harvard University, Cambridge, MA, USA
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Fruciano C, Celik MA, Butler K, Dooley T, Weisbecker V, Phillips MJ. Sharing is caring? Measurement error and the issues arising from combining 3D morphometric datasets. Ecol Evol 2017; 7:7034-7046. [PMID: 28904781 PMCID: PMC5587461 DOI: 10.1002/ece3.3256] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2017] [Revised: 05/03/2017] [Accepted: 06/28/2017] [Indexed: 01/22/2023] Open
Abstract
Geometric morphometrics is routinely used in ecology and evolution and morphometric datasets are increasingly shared among researchers, allowing for more comprehensive studies and higher statistical power (as a consequence of increased sample size). However, sharing of morphometric data opens up the question of how much nonbiologically relevant variation (i.e., measurement error) is introduced in the resulting datasets and how this variation affects analyses. We perform a set of analyses based on an empirical 3D geometric morphometric dataset. In particular, we quantify the amount of error associated with combining data from multiple devices and digitized by multiple operators and test for the presence of bias. We also extend these analyses to a dataset obtained with a recently developed automated method, which does not require human-digitized landmarks. Further, we analyze how measurement error affects estimates of phylogenetic signal and how its effect compares with the effect of phylogenetic uncertainty. We show that measurement error can be substantial when combining surface models produced by different devices and even more among landmarks digitized by different operators. We also document the presence of small, but significant, amounts of nonrandom error (i.e., bias). Measurement error is heavily reduced by excluding landmarks that are difficult to digitize. The automated method we tested had low levels of error, if used in combination with a procedure for dimensionality reduction. Estimates of phylogenetic signal can be more affected by measurement error than by phylogenetic uncertainty. Our results generally highlight the importance of landmark choice and the usefulness of estimating measurement error. Further, measurement error may limit comparisons of estimates of phylogenetic signal across studies if these have been performed using different devices or by different operators. Finally, we also show how widely held assumptions do not always hold true, particularly that measurement error affects inference more at a shallower phylogenetic scale and that automated methods perform worse than human digitization.
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Affiliation(s)
- Carmelo Fruciano
- School of Earth, Environmental and Biological Sciences Queensland University of Technology Brisbane Qld Australia
| | - Mélina A Celik
- School of Earth, Environmental and Biological Sciences Queensland University of Technology Brisbane Qld Australia
| | - Kaylene Butler
- School of Earth and Environmental Sciences University of Queensland St. Lucia Qld Australia
| | - Tom Dooley
- School of Earth and Environmental Sciences University of Queensland St. Lucia Qld Australia
| | - Vera Weisbecker
- School of Biological Sciences University of Queensland St. Lucia Qld Australia
| | - Matthew J Phillips
- School of Earth, Environmental and Biological Sciences Queensland University of Technology Brisbane Qld Australia
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7
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Bakkes DK. Evaluation of measurement error in rotational mounting of larval Rhipicephalus (Acari: Ixodida: Ixodidae) species in geometric morphometrics. ZOOMORPHOLOGY 2017. [DOI: 10.1007/s00435-017-0357-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Fruciano C, Franchini P, Kovacova V, Elmer KR, Henning F, Meyer A. Genetic linkage of distinct adaptive traits in sympatrically speciating crater lake cichlid fish. Nat Commun 2016; 7:12736. [PMID: 27597183 PMCID: PMC5025864 DOI: 10.1038/ncomms12736] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2015] [Accepted: 07/28/2016] [Indexed: 01/03/2023] Open
Abstract
Our understanding of how biological diversity arises is limited, especially in the case of speciation in the face of gene flow. Here we investigate the genomic basis of adaptive traits, focusing on a sympatrically diverging species pair of crater lake cichlid fishes. We identify the main quantitative trait loci (QTL) for two eco-morphological traits: body shape and pharyngeal jaw morphology. These traits diverge in parallel between benthic and limnetic species in the repeated adaptive radiations of this and other fish lineages. Remarkably, a single chromosomal region contains the highest effect size QTL for both traits. Transcriptomic data show that the QTL regions contain genes putatively under selection. Independent population genomic data corroborate QTL regions as areas of high differentiation between the sympatric sister species. Our results provide empirical support for current theoretical models that emphasize the importance of genetic linkage and pleiotropy in facilitating rapid divergence in sympatry.
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Affiliation(s)
- Carmelo Fruciano
- Lehrstuhl für Zoologie and Evolutionsbiologie, Department of Biology, University of Konstanz, Universitätsstrasse 10, 78457 Konstanz, Germany.,School of Earth, Environmental and Biological Sciences, Queensland University of Technology, Brisbane, Queensland 4000, Australia
| | - Paolo Franchini
- Lehrstuhl für Zoologie and Evolutionsbiologie, Department of Biology, University of Konstanz, Universitätsstrasse 10, 78457 Konstanz, Germany
| | - Viera Kovacova
- Lehrstuhl für Zoologie and Evolutionsbiologie, Department of Biology, University of Konstanz, Universitätsstrasse 10, 78457 Konstanz, Germany.,Department for Plant Developmental Genetics, Institute of Biophysics, Academy of Sciences Czech Republic, Královopolská 135, 612 65 Brno, Czech Republic
| | - Kathryn R Elmer
- Lehrstuhl für Zoologie and Evolutionsbiologie, Department of Biology, University of Konstanz, Universitätsstrasse 10, 78457 Konstanz, Germany.,Institute of Biodiversity, Animal Health and Comparative Medicine, College of Medical, Veterinary and Life Sciences University of Glasgow, Glasgow G12 8QQ, UK
| | - Frederico Henning
- Lehrstuhl für Zoologie and Evolutionsbiologie, Department of Biology, University of Konstanz, Universitätsstrasse 10, 78457 Konstanz, Germany
| | - Axel Meyer
- Lehrstuhl für Zoologie and Evolutionsbiologie, Department of Biology, University of Konstanz, Universitätsstrasse 10, 78457 Konstanz, Germany
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Raffini F, Fruciano C, Franchini P, Meyer A. Towards understanding the genetic basis of mouth asymmetry in the scale-eating cichlidPerissodus microlepis. Mol Ecol 2016; 26:77-91. [DOI: 10.1111/mec.13699] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2016] [Revised: 04/29/2016] [Accepted: 05/09/2016] [Indexed: 12/16/2022]
Affiliation(s)
- Francesca Raffini
- Lehrstuhl für Zoologie und Evolutionsbiologie; Department of Biology; University of Konstanz; Universitätsstrasse 10 78464 Konstanz Germany
- International Max Planck Research School (IMPRS) for Organismal Biology; Max-Planck-Institut für Ornithologie; Am Obstberg 1 78315 Radolfzell Germany
| | - Carmelo Fruciano
- Lehrstuhl für Zoologie und Evolutionsbiologie; Department of Biology; University of Konstanz; Universitätsstrasse 10 78464 Konstanz Germany
| | - Paolo Franchini
- Lehrstuhl für Zoologie und Evolutionsbiologie; Department of Biology; University of Konstanz; Universitätsstrasse 10 78464 Konstanz Germany
| | - Axel Meyer
- Lehrstuhl für Zoologie und Evolutionsbiologie; Department of Biology; University of Konstanz; Universitätsstrasse 10 78464 Konstanz Germany
- International Max Planck Research School (IMPRS) for Organismal Biology; Max-Planck-Institut für Ornithologie; Am Obstberg 1 78315 Radolfzell Germany
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Quantitative trait locus analysis of body shape divergence in nine-spined sticklebacks based on high-density SNP-panel. Sci Rep 2016; 6:26632. [PMID: 27226078 PMCID: PMC4880927 DOI: 10.1038/srep26632] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Accepted: 05/06/2016] [Indexed: 12/26/2022] Open
Abstract
Heritable phenotypic differences between populations, caused by the selective effects of distinct environmental conditions, are of commonplace occurrence in nature. However, the actual genomic targets of this kind of selection are still poorly understood. We conducted a quantitative trait locus (QTL) mapping study to identify genomic regions responsible for morphometric differentiation between genetically and phenotypically divergent marine and freshwater nine-spined stickleback (Pungitius pungitius) populations. Using a dense panel of SNP-markers obtained by restriction site associated DNA sequencing of an F2 recombinant cross, we found 22 QTL that explained 3.5-12.9% of phenotypic variance in the traits under investigation. We detected one fairly large-effect (PVE = 9.6%) QTL for caudal peduncle length-a trait with a well-established adaptive function showing clear differentiation among marine and freshwater populations. We also identified two large-effect QTL for lateral plate numbers, which are different from the lateral plate QTL reported in earlier studies of this and related species. Hence, apart from identifying several large-effect QTL in shape traits showing adaptive differentiation in response to different environmental conditions, the results suggest intra- and interspecific heterogeneity in the genomic basis of lateral plate number variation.
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Fruciano C, Franchini P, Raffini F, Fan S, Meyer A. Are sympatrically speciating Midas cichlid fish special? Patterns of morphological and genetic variation in the closely related species Archocentrus centrarchus. Ecol Evol 2016; 6:4102-14. [PMID: 27516867 PMCID: PMC4877357 DOI: 10.1002/ece3.2184] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Revised: 04/18/2016] [Accepted: 04/22/2016] [Indexed: 12/14/2022] Open
Abstract
Established empirical cases of sympatric speciation are scarce, although there is an increasing consensus that sympatric speciation might be more common than previously thought. Midas cichlid fish are one of the few substantiated cases of sympatric speciation, and they formed repeated radiations in crater lakes. In contrast, in the same environment, such radiation patterns have not been observed in other species of cichlids and other families of fish. We analyze morphological and genetic variation in a cichlid species (Archocentrus centrarchus) that co-inhabits several crater lakes with the Midas species complex. In particular, we analyze variation in body and pharyngeal jaw shape (two ecologically important traits in sympatrically divergent Midas cichlids) and relate that to genetic variation in mitochondrial control region and microsatellites. Using these four datasets, we analyze variation between and within two Nicaraguan lakes: a crater lake where multiple Midas cichlids have been described and a lake where the source population lives. We do not observe any within-lake clustering consistent across morphological traits and genetic markers, suggesting the absence of sympatric divergence in A. centrarchus. Genetic differentiation between lakes was low and morphological divergence absent. Such morphological similarity between lakes is found not only in average morphology, but also when analyzing covariation between traits and degree of morphospace occupation. A combined analysis of the mitochondrial control region in A. centrarchus and Midas cichlids suggests that a difference between lineages in the timing of crater lake colonization cannot be invoked as an explanation for the difference in their levels of diversification. In light of our results, A. centrarchus represents the ideal candidate to study the genomic differences between these two lineages that might explain why some lineages are more likely to speciate and diverge in sympatry than others.
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Affiliation(s)
- Carmelo Fruciano
- Department of Biology Chair of Zoology and Evolutionary Biology University of Konstanz Universitätsstrasse 1078457 Konstanz Germany; School of Earth, Environmental & Biological Sciences Queensland University of Technology Brisbane Qld 4000 Australia
| | - Paolo Franchini
- Department of Biology Chair of Zoology and Evolutionary Biology University of Konstanz Universitätsstrasse 10 78457 Konstanz Germany
| | - Francesca Raffini
- Department of Biology Chair of Zoology and Evolutionary Biology University of Konstanz Universitätsstrasse 1078457 Konstanz Germany; International Max Planck Research School (IMPRS) for Organismal Biology Max-Planck-Institut für Ornithologie Am Obstberg 178315 Radolfzell Germany
| | - Shaohua Fan
- Department of Biology Chair of Zoology and Evolutionary Biology University of Konstanz Universitätsstrasse 10 78457 Konstanz Germany
| | - Axel Meyer
- Department of Biology Chair of Zoology and Evolutionary Biology University of Konstanz Universitätsstrasse 10 78457 Konstanz Germany
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13
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Measurement error in geometric morphometrics. Dev Genes Evol 2016; 226:139-58. [DOI: 10.1007/s00427-016-0537-4] [Citation(s) in RCA: 104] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2015] [Accepted: 12/28/2015] [Indexed: 10/22/2022]
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14
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Franchini P, Colangelo P, Meyer A, Fruciano C. Chromosomal rearrangements, phenotypic variation and modularity: a case study from a contact zone between house mouse Robertsonian races in Central Italy. Ecol Evol 2016; 6:1353-62. [PMID: 26855768 PMCID: PMC4733104 DOI: 10.1002/ece3.1912] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Accepted: 12/03/2015] [Indexed: 11/21/2022] Open
Abstract
The Western European house mouse, Mus musculus domesticus, is well‐known for the high frequency of Robertsonian fusions that have rapidly produced more than 50 karyotipic races, making it an ideal model for studying the mechanisms of chromosomal speciation. The mouse mandible is one of the traits studied most intensively to investigate the effect of Robertsonian fusions on phenotypic variation within and between populations. This complex bone structure has also been widely used to study the level of integration between different morphogenetic units. Here, with the aim of testing the effect of different karyotypic assets on the morphology of the mouse mandible and on its level of modularity, we performed morphometric analyses of mice from a contact area between two highly metacentric races in Central Italy. We found no difference in size, while the mandible shape was found to be different between the two Robertsonian races, even after accounting for the genetic relationships among individuals and geographic proximity. Our results support the existence of two modules that indicate a certain degree of evolutionary independence, but no difference in the strength of modularity between chromosomal races. Moreover, the ascending ramus showed more pronounced interpopulation/race phenotypic differences than the alveolar region, an effect that could be associated to their different polygenic architecture. This study suggests that chromosomal rearrangements play a role in the house mouse phenotypic divergence, and that the two modules of the mouse mandible are differentially affected by environmental factors and genetic makeup.
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Affiliation(s)
- Paolo Franchini
- Department of Biology Lehrstuhl für Zoologie und Evolutionsbiologie University of Konstanz Universitätsstraße 1078457 Konstanz Germany; Dipartimento di Biologia e Biotecnologie "Charles Darwin" Universitá di Roma "La Sapienza" via Borelli 5000161 Roma Italy
| | | | - Axel Meyer
- Department of Biology Lehrstuhl für Zoologie und Evolutionsbiologie University of Konstanz Universitätsstraße 10 78457 Konstanz Germany
| | - Carmelo Fruciano
- Department of Biology Lehrstuhl für Zoologie und Evolutionsbiologie University of Konstanz Universitätsstraße 1078457 Konstanz Germany; School of Earth Environmental and Biological Sciences Queensland University of Technology Gardens Point 4000 Brisbane Australia
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Schmieder DA, Benítez HA, Borissov IM, Fruciano C. Bat Species Comparisons Based on External Morphology: A Test of Traditional versus Geometric Morphometric Approaches. PLoS One 2015; 10:e0127043. [PMID: 25965335 PMCID: PMC4428882 DOI: 10.1371/journal.pone.0127043] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2014] [Accepted: 04/11/2015] [Indexed: 11/19/2022] Open
Abstract
External morphology is commonly used to identify bats as well as to investigate flight and foraging behavior, typically relying on simple length and area measures or ratios. However, geometric morphometrics is increasingly used in the biological sciences to analyse variation in shape and discriminate among species and populations. Here we compare the ability of traditional versus geometric morphometric methods in discriminating between closely related bat species--in this case European horseshoe bats (Rhinolophidae, Chiroptera)--based on morphology of the wing, body and tail. In addition to comparing morphometric methods, we used geometric morphometrics to detect interspecies differences as shape changes. Geometric morphometrics yielded improved species discrimination relative to traditional methods. The predicted shape for the variation along the between group principal components revealed that the largest differences between species lay in the extent to which the wing reaches in the direction of the head. This strong trend in interspecific shape variation is associated with size, which we interpret as an evolutionary allometry pattern.
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Affiliation(s)
- Daniela A. Schmieder
- Sensory Ecology Group, Max Planck Institute for Ornithology, Seewiesen, Germany
- Conservation Biology, Institute of Ecology and Evolution, University of Bern, Bern, Switzerland
| | - Hugo A. Benítez
- Faculty of Life Sciences, University of Manchester, Manchester, United Kingdom
- Instituto de Alta Investigación, Universidad de Tarapacá, Arica, Chile
| | - Ivailo M. Borissov
- Sensory Ecology Group, Max Planck Institute for Ornithology, Seewiesen, Germany
- Department of Zoology, University of Tel Aviv, Tel Aviv, Israel
| | - Carmelo Fruciano
- Lehrstuhl für Zoologie und Evolutionsbiologie, Department of Biology, University of Konstanz, Konstanz, Germany
- Department of Biological, Zoological and Environmental Sciences, University of Catania, Catania, Italy
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Fruciano C, Pappalardo AM, Tigano C, Ferrito V. Phylogeographical relationships of Sicilian brown trout and the effects of genetic introgression on morphospace occupation. Biol J Linn Soc Lond 2014. [DOI: 10.1111/bij.12279] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Carmelo Fruciano
- Department of Biological, Geological and Environmental Sciences; University of Catania; via Androne 81 95124 Catania Italy
| | - Anna Maria Pappalardo
- Department of Biological, Geological and Environmental Sciences; University of Catania; via Androne 81 95124 Catania Italy
| | - Concetta Tigano
- Department of Biological, Geological and Environmental Sciences; University of Catania; via Androne 81 95124 Catania Italy
| | - Venera Ferrito
- Department of Biological, Geological and Environmental Sciences; University of Catania; via Androne 81 95124 Catania Italy
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Franchini P, Fruciano C, Spreitzer ML, Jones JC, Elmer KR, Henning F, Meyer A. Genomic architecture of ecologically divergent body shape in a pair of sympatric crater lake cichlid fishes. Mol Ecol 2013; 23:1828-45. [PMID: 24237636 DOI: 10.1111/mec.12590] [Citation(s) in RCA: 92] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2013] [Revised: 10/18/2013] [Accepted: 10/28/2013] [Indexed: 12/26/2022]
Abstract
Determining the genetic bases of adaptations and their roles in speciation is a prominent issue in evolutionary biology. Cichlid fish species flocks are a prime example of recent rapid radiations, often associated with adaptive phenotypic divergence from a common ancestor within a short period of time. In several radiations of freshwater fishes, divergence in ecomorphological traits - including body shape, colour, lips and jaws - is thought to underlie their ecological differentiation, specialization and, ultimately, speciation. The Midas cichlid species complex (Amphilophus spp.) of Nicaragua provides one of the few known examples of sympatric speciation where species have rapidly evolved different but parallel morphologies in young crater lakes. This study identified significant QTL for body shape using SNPs generated via ddRAD sequencing and geometric morphometric analyses of a cross between two ecologically and morphologically divergent, sympatric cichlid species endemic to crater Lake Apoyo: an elongated limnetic species (Amphilophus zaliosus) and a high-bodied benthic species (Amphilophus astorquii). A total of 453 genome-wide informative SNPs were identified in 240 F2 hybrids. These markers were used to construct a genetic map in which 25 linkage groups were resolved. Seventy-two segregating SNPs were linked to 11 QTL. By annotating the two most highly supported QTL-linked genomic regions, genes that might contribute to divergence in body shape along the benthic-limnetic axis in Midas cichlid sympatric adaptive radiations were identified. These results suggest that few genomic regions of large effect contribute to early stage divergence in Midas cichlids.
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Affiliation(s)
- Paolo Franchini
- Lehrstuhl für Zoologie und Evolutionsbiologie, Department of Biology, University of Konstanz, Universitätstraße 10, 78457, Konstanz, Germany
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Bertin A, Ruíz VH, Figueroa R, Gouin N. The role of spatial processes and environmental determinants in microgeographic shell variation of the freshwater snail Chilina dombeyana (Bruguière, 1789). Naturwissenschaften 2012; 99:225-32. [DOI: 10.1007/s00114-012-0890-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2011] [Revised: 01/26/2012] [Accepted: 01/31/2012] [Indexed: 10/14/2022]
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