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Article ; Online: Independent transitions to freshwater environments promote phenotypic divergence, not convergence, in stingrays.

Magnuson, A / Dean, M N / Weaver, J / Fontenelle, J P / Lovejoy, N R / Kolmann, M A

2024

Abstract: Instances of convergent or parallel evolution provide a potent model system for exploring contingency and determinism in evolutionary biology. Likewise, the multiple, independent habitat transitions from saltwater to freshwater biomes offer opportunity ... ...

Abstract	Instances of convergent or parallel evolution provide a potent model system for exploring contingency and determinism in evolutionary biology. Likewise, the multiple, independent habitat transitions from saltwater to freshwater biomes offer opportunity for studying convergent evolution within and among different vertebrate lineages. For example, stingrays have invaded freshwater habitats multiple times across different continents, sometimes even several times within the same clade (e.g., Dasyatidae). We evaluated the frequency of saltwater-freshwater invasions in stingrays, compared ecological and phenotypic diversification among freshwater and saltwater lineages, and assessed the degree of convergence among freshwater species. Despite not being morphologically distinct from saltwater stingrays, freshwater stingrays do expand the margins of stingray morphological diversity. According to our data, trophic specialists occupied non-overlapping regions of morphospace, with piscivores and molluscivores being distinct from other diet guilds. Freshwater stingrays as a group did not strongly converge morphologically, neither did freshwater rays from different lineages which shared similar niches. These findings could be explained by there not being enough time for convergence to occur among more ancient and more recent freshwater lineages. Alternatively, the different ancestral bauplans of various freshwater ray lineages and weak selection on optimal phenotypes could promote contingency in the form of evolution along paths of least resistance.
Language	English
Publishing date	2024-04-23
Publishing country	England
Document type	Journal Article
ZDB-ID	2159110-6
ISSN	1557-7023 ; 1540-7063
ISSN (online)	1557-7023
ISSN	1540-7063
DOI	10.1093/icb/icae023
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Article ; Online: Phenotypic convergence is more frequent and stronger in herbivorous freshwater fishes.

Kolmann, M A / Poulin, E / Rosen, J / Hemraj-Naraine, D / Burns, M D

Integrative and comparative biology

2024

Abstract: Constraints on phenotypic evolution can lead to patterns of convergent evolution, by limiting the 'pool' of potential phenotypes in the face of endogenous (functional, developmental) or exogenous (competition, predation) selective pressures. Evaluation ... ...

Abstract	Constraints on phenotypic evolution can lead to patterns of convergent evolution, by limiting the 'pool' of potential phenotypes in the face of endogenous (functional, developmental) or exogenous (competition, predation) selective pressures. Evaluation of convergence depends on integrating ecological and morphological data within a robust, comparative phylogenetic context. The staggering diversity of teleost fishes offers a multitude of lineages adapted for similar ecological roles, and therefore, offers numerous replicated evolutionary experiments for exploring phenotypic convergence. However, our understanding of fish feeding systems has been primarily shaped by marine species, with the monolithic exception of freshwater cichlids. Here we use piranhas and pacus (Serrasalmidae) to explore the evolution of different feeding ecologies and their morphological proxies in Neotropical freshwater environments. Specifically, we explore whether convergence is more widespread among plant-eating fishes, arising from strong constraints on phenotypic evolution in herbivores. Using osteological micro-computed tomographic imaging (μCT), we describe the major axes of morphological variation in pacus and piranhas, regarding their diet and feeding behaviors. Next, we evaluated whether herbivorous niches are less labile than other dietary guilds and whether herbivorous species' phenotypes evolve at a slower evolutionary rate than other taxa. We then assess how convergent herbivorous taxa are, using three different suites of morphological characters (dental, jaw, and abdominal morphometrics). Ecologically, herbivory is not a dead end, exhibiting similar observed transition rates as those between carnivores and omnivores. However, we documented widespread convergence in herbivores and that herbivores have slower rates of phenotypic evolution than carnivores. Most instances of convergence are found in herbivorous taxa, specifically in frugivores and folivores. Moreover, instances of 'complete' convergence, indicated by positive convergence metrics observed in more than one morphometric dataset, were only found in herbivores. Herbivores do appear to evolve under constrained circumstances, but this has not limited their ecological lability.
Language	English
Publishing date	2024-05-09
Publishing country	England
Document type	Journal Article
ZDB-ID	2159110-6
ISSN	1557-7023 ; 1540-7063
ISSN (online)	1557-7023
ISSN	1540-7063
DOI	10.1093/icb/icae037
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Article ; Online: How to Survive a (Juvenile) Piranha Attack: An Integrative Approach to Evaluating Predator Performance.

Lowe, A / Kolmann, M A / Paig-Tran, E W M

Integrative organismal biology (Oxford, England)

2023 Volume 5, Issue 1, Page(s) obad032

Abstract: Figures: Cory cat panel figureDrawing of bite force measuring equipment and indentation rig : Synopsis: There is an evolutionary arms race between predators and prey. In aquatic environments, predatory fishes often use sharp teeth, powerful bites, ... ...

Abstract	Figures: Cory cat panel figureDrawing of bite force measuring equipment and indentation rig Synopsis: There is an evolutionary arms race between predators and prey. In aquatic environments, predatory fishes often use sharp teeth, powerful bites, and/or streamlined bodies to help capture their prey quickly and efficiently. Conversely, prey are often equipped with antipredator adaptations including: scaly armor, sharp spines, and/or toxic secretions. This study focused on the predator-prey interactions between the armored threestripe cory catfish (
Language	English
Publishing date	2023-09-01
Publishing country	England
Document type	Journal Article
ISSN	2517-4843
ISSN (online)	2517-4843
DOI	10.1093/iob/obad032
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Article ; Online: The Lesser-Known Transitions: Organismal Form and Function across Abiotic Gradients.

Easterling, C M / Kolmann, M A / O'Donnell, M K

Integrative and comparative biology

2022 Volume 62, Issue 4, Page(s) 829–839

Abstract: From minute-to-minute changes, or across daily, seasonal, or geological timescales, animals are forced to navigate dynamic surroundings. Their abiotic environment is continually changing. These changes could include alterations to the substrates animals ... ...

Abstract	From minute-to-minute changes, or across daily, seasonal, or geological timescales, animals are forced to navigate dynamic surroundings. Their abiotic environment is continually changing. These changes could include alterations to the substrates animals locomote on, flow dynamics of the microhabitats they feed in, or even altitudinal shifts over migration routes. The only constancy in any organism's day-to-day existence is the heterogeneity of the habitats they move through and the gradients in the physical media (e.g., air and water) they live in. We explored a broad range of organismal transitions across abiotic gradients and investigated how these organisms modify their form, function, and behavior to accommodate their surrounding media. We asked the following questions: (1) What are some challenges common to animals in changing media or moving between media? (2) What are common solutions to these recurring problems? (3) How often are these common solutions instances of either convergence or parallelism? Our symposium speakers explored these questions through critical analysis of numerous datasets spanning multiple taxa, timescales, and levels of analysis. After discussions with our speakers, we suggest that the role of physical principles (e.g., drag, gravity, buoyancy, and viscosity) in constraining morphology and shaping the realized niche has been underappreciated. We recommend that investigations of these transitions and corresponding adaptations should include comparisons at multiple levels of biological organization and timescale. Relatedly, studies of organisms that undergo habitat and substrate changes over ontogeny would be worthwhile to include in comparisons. Future researchers should ideally complement lab-based morphological and kinematic studies with observational and experimental approaches in the field. Synthesis of the findings of our speakers across multiple study systems, timescales, and transitional habitats suggests that behavioral modification and exaptation of morphology play key roles in modulating novel transitions between substrates.
MeSH term(s)	Animals ; Ecosystem ; Adaptation, Physiological ; Acclimatization ; Growth and Development
Language	English
Publishing date	2022-08-01
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2159110-6
ISSN	1557-7023 ; 1540-7063
ISSN (online)	1557-7023
ISSN	1540-7063
DOI	10.1093/icb/icac133
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Article ; Online: True grit? Comparative anatomy and evolution of gizzards in fishes.

Arnette, S D / Simonitis, L E / Egan, J P / Cohen, K E / Kolmann, M A

Journal of anatomy

2023 Volume 244, Issue 2, Page(s) 260–273

Abstract: Gut morphology frequently reflects the food organisms digest. Gizzards are organs of the gut found in archosaurs and fishes that mechanically reduce food to aid digestion. Gizzards are thought to compensate for edentulism and/or provide an advantage when ...

Abstract	Gut morphology frequently reflects the food organisms digest. Gizzards are organs of the gut found in archosaurs and fishes that mechanically reduce food to aid digestion. Gizzards are thought to compensate for edentulism and/or provide an advantage when consuming small, tough food items (e.g., phytoplankton and algae). It is unknown how widespread gizzards are in fishes and how similar these structures are among different lineages. Here, we investigate the distribution of gizzards across bony fishes to (1) survey different fishes for gizzard presence, (2) compare the histological structure of gizzards in three species, (3) estimate how often gizzards have evolved in fishes, and (4) explore whether anatomical and ecological traits like edentulism and microphagy predict gizzard presence. According to our analyses, gizzards are rare across bony fishes, evolving only six times in a broad taxonomic sampling of 51 species, and gizzard presence is not clearly correlated with factors like gut length or dentition. We find that gizzard morphology varies among the lineages where one is present, both macroscopically (presence of a crop) and microscopically (varying tissue types). We conclude that gizzards likely aid in the mechanical reduction of food in fishes that have lost an oral dentition in their evolutionary past; however, the relative scarcity of gizzards suggests they are just one of many possible solutions for processing tough, nutrient-poor food items. Gizzards have long been present in the evolutionary history of fishes, can be found in a wide variety of marine and freshwater clades, and likely have been overlooked in many taxa.
MeSH term(s)	Animals ; Gizzard, Avian/anatomy & histology ; Anatomy, Comparative ; Fishes/anatomy & histology
Language	English
Publishing date	2023-09-28
Publishing country	England
Document type	Journal Article
ZDB-ID	2955-5
ISSN	1469-7580 ; 0021-8782
ISSN (online)	1469-7580
ISSN	0021-8782
DOI	10.1111/joa.13956
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Article ; Online: Ecological and Phenotypic Diversification after a Continental Invasion in Neotropical Freshwater Stingrays.

Kolmann, M A / Marques, F P L / Weaver, J C / Dean, M N / Fontenelle, J P / Lovejoy, N R

Integrative and comparative biology

2022 Volume 62, Issue 2, Page(s) 424–440

Abstract: Habitat transitions are key potential explanations for why some lineages have diversified and others have not-from Anolis lizards to Darwin's finches. The ecological ramifications of marine-to-freshwater transitions for fishes suggest evolutionary ... ...

Abstract	Habitat transitions are key potential explanations for why some lineages have diversified and others have not-from Anolis lizards to Darwin's finches. The ecological ramifications of marine-to-freshwater transitions for fishes suggest evolutionary contingency: some lineages maintain their ancestral niches in novel habitats (niche conservatism), whereas others alter their ecological role. However, few studies have considered phenotypic, ecological, and lineage diversification concurrently to explore this issue. Here, we investigated the macroevolutionary history of the taxonomically and ecologically diverse Neotropical freshwater river rays (subfamily Potamotrygoninae), which invaded and diversified in the Amazon and other South American rivers during the late Oligocene to early Miocene. We generated a time-calibrated, multi-gene phylogeny for Potamotrygoninae and reconstructed evolutionary patterns of diet specialization. We measured functional morphological traits relevant for feeding and used comparative phylogenetic methods to examine how feeding morphology diversified over time. Potamotrygonine trophic and phenotypic diversity are evenly partitioned (non-overlapping) among internal clades for most of their history, until 20-16 mya, when more recent diversification suggests increasing overlap among phenotypes. Specialized piscivores (Heliotrygon and Paratrygon) evolved early in the history of freshwater stingrays, while later trophic specialization (molluscivory, insectivory, and crustacivory) evolved in the genus Potamotrygon. Potamotrygonins demonstrate ecological niche lability in diets and feeding apparatus; however, diversification has mostly been a gradual process through time. We suggest that competition is unlikely to have limited the potamotrygonine invasion and diversification in South America.
MeSH term(s)	Animals ; Fresh Water ; Lizards/genetics ; Phenotype ; Phylogeny ; Skates, Fish
Language	English
Publishing date	2022-04-28
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2159110-6
ISSN	1557-7023 ; 1540-7063
ISSN (online)	1557-7023
ISSN	1540-7063
DOI	10.1093/icb/icac019
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Article ; Online: Have Niche, Will Travel. New Means of Linking Diet and Ecomorphology Reveals Niche Conservatism in Freshwater Cottoid Fishes.

Buser, T J / Finnegan, D L / Summers, A P / Kolmann, M A

Integrative organismal biology (Oxford, England)

2019 Volume 1, Issue 1, Page(s) obz023

Abstract: Evolutionary transitions between habitats have been catalysts for some of the most stunning examples of adaptive diversification, with novel niches and new resources providing ecological opportunity for such radiations. In aquatic animals, transitions ... ...

Abstract	Evolutionary transitions between habitats have been catalysts for some of the most stunning examples of adaptive diversification, with novel niches and new resources providing ecological opportunity for such radiations. In aquatic animals, transitions from saltwater to freshwater habitats are rare, but occur often enough that in the Neotropics for example, marine-derived fishes contribute noticeably to regional ichthyofaunal diversity. Here, we investigate how morphology has evolved in a group of temperate fishes that contain a marine to freshwater transition: the sculpins (Percomorpha; Cottoidea). We devised a novel method for classifying dietary niche and relating functional aspects of prey to their predators. Coupled with functional measurements of the jaw apparatus in cottoids, we explored whether freshwater sculpins have fundamentally changed their niche after invading freshwater (niche lability) or if they retain a niche similar to their marine cousins (niche conservatism). Freshwater sculpins exhibit both phylogeographical and ecological signals of phylogenetic niche conservatism, meaning that regardless of habitat, sculpins fill similar niche roles in either saltwater or freshwater. Rather than competition guiding niche conservatism in freshwater cottoids, we argue that strong intrinsic constraints on morphological and ecological evolution are at play, contra to other studies of diversification in marine-derived freshwater fishes. However, several intertidal and subtidal sculpins as well as several pelagic freshwater species from Lake Baikal show remarkable departures from the typical sculpin bauplan. Our method of prey categorization provides an explicit, quantitative means of classifying dietary niche for macroevolutionary studies, rather than relying on somewhat arbitrary means used in previous literature.
Language	English
Publishing date	2019-09-06
Publishing country	England
Document type	Journal Article
ISSN	2517-4843
ISSN (online)	2517-4843
DOI	10.1093/iob/obz023
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Article ; Online: Swimming and defence: competing needs across ontogeny in armoured fishes (Agonidae).

Kolmann, M A / Peixoto, T / Pfeiffenberger, J A / Summers, A P / Donatelli, C M

Journal of the Royal Society, Interface

2020 Volume 17, Issue 169, Page(s) 20200301

Abstract: Biological armours are potent model systems for understanding the complex series of competing demands on protective exoskeletons; after all, armoured organisms are the product of millions of years of refined engineering under the harshest conditions. ... ...

Abstract	Biological armours are potent model systems for understanding the complex series of competing demands on protective exoskeletons; after all, armoured organisms are the product of millions of years of refined engineering under the harshest conditions. Fishes are no strangers to armour, with various types of armour plating common to the 400-500 Myr of evolution in both jawed and jawless fishes. Here, we focus on the poachers (Agonidae), a family of armoured fishes native to temperate waters of the Pacific rim. We examined armour morphology, body stiffness and swimming performance in the northern spearnose poacher (
MeSH term(s)	Animals ; Fishes ; Locomotion ; Models, Biological ; Perciformes ; Swimming
Language	English
Publishing date	2020-08-12
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
ZDB-ID	2156283-0
ISSN	1742-5662 ; 1742-5689
ISSN (online)	1742-5662
ISSN	1742-5689
DOI	10.1098/rsif.2020.0301
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Article ; Online: Hyperspectral data as a biodiversity screening tool can differentiate among diverse Neotropical fishes.

Kolmann, M A / Kalacska, M / Lucanus, O / Sousa, L / Wainwright, D / Arroyo-Mora, J P / Andrade, M C

Scientific reports

2021 Volume 11, Issue 1, Page(s) 16157

Abstract: Hyperspectral data encode information from electromagnetic radiation (i.e., color) of any object in the form of a spectral signature; these data can then be used to distinguish among materials or even map whole landscapes. Although hyperspectral data ... ...

Abstract	Hyperspectral data encode information from electromagnetic radiation (i.e., color) of any object in the form of a spectral signature; these data can then be used to distinguish among materials or even map whole landscapes. Although hyperspectral data have been mostly used to study landscape ecology, floral diversity and many other applications in the natural sciences, we propose that spectral signatures can be used for rapid assessment of faunal biodiversity, akin to DNA barcoding and metabarcoding. We demonstrate that spectral signatures of individual, live fish specimens can accurately capture species and clade-level differences in fish coloration, specifically among piranhas and pacus (Family Serrasalmidae), fishes with a long history of taxonomic confusion. We analyzed 47 serrasalmid species and could distinguish spectra among different species and clades, with the method sensitive enough to document changes in fish coloration over ontogeny. Herbivorous pacu spectra were more like one another than they were to piranhas; however, our method also documented interspecific variation in pacus that corresponds to cryptic lineages. While spectra do not serve as an alternative to the collection of curated specimens, hyperspectral data of fishes in the field should help clarify which specimens might be unique or undescribed, complementing existing molecular and morphological techniques.
MeSH term(s)	Animals ; Biodiversity ; Characiformes/classification ; Characiformes/genetics ; Characiformes/metabolism ; DNA Barcoding, Taxonomic ; Hyperspectral Imaging/methods ; Phenotype ; Pigmentation ; South America
Language	English
Publishing date	2021-08-09
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
ZDB-ID	2615211-3
ISSN	2045-2322 ; 2045-2322
ISSN (online)	2045-2322
ISSN	2045-2322
DOI	10.1038/s41598-021-95713-0
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Article ; Online: Phylogenomics of Piranhas and Pacus (Serrasalmidae) Uncovers How Dietary Convergence and Parallelism Obfuscate Traditional Morphological Taxonomy.

Kolmann, M A / Hughes, L C / Hernandez, L P / Arcila, D / Betancur-R, R / Sabaj, M H / López-Fernández, H / Ortí, G

Systematic biology

2020 Volume 70, Issue 3, Page(s) 576–592

Abstract: The Amazon and neighboring South American river basins harbor the world's most diverse assemblages of freshwater fishes. One of the most prominent South American fish families is the Serrasalmidae (pacus and piranhas), found in nearly every continental ... ...

Abstract	The Amazon and neighboring South American river basins harbor the world's most diverse assemblages of freshwater fishes. One of the most prominent South American fish families is the Serrasalmidae (pacus and piranhas), found in nearly every continental basin. Serrasalmids are keystone ecological taxa, being some of the top riverine predators as well as the primary seed dispersers in the flooded forest. Despite their widespread occurrence and notable ecologies, serrasalmid evolutionary history and systematics are controversial. For example, the sister taxon to serrasalmids is contentious, the relationships of major clades within the family are inconsistent across different methodologies, and half of the extant serrasalmid genera are suggested to be non-monophyletic. We analyzed exon capture to reexamine the evolutionary relationships among 63 (of 99) species across all 16 serrasalmid genera and their nearest outgroups, including multiple individuals per species to account for cryptic lineages. To reconstruct the timeline of serrasalmid diversification, we time-calibrated this phylogeny using two different fossil-calibration schemes to account for uncertainty in taxonomy with respect to fossil teeth. Finally, we analyzed diet evolution across the family and comment on associated changes in dentition, highlighting the ecomorphological diversity within serrasalmids. We document widespread non-monophyly of genera within Myleinae, as well as between Serrasalmus and Pristobrycon, and propose that reliance on traits like teeth to distinguish among genera is confounded by ecological homoplasy, especially among herbivorous and omnivorous taxa. We clarify the relationships among all serrasalmid genera, propose new subfamily affiliations, and support hemiodontids as the sister taxon to Serrasalmidae. [Characiformes; exon capture; ichthyochory; molecular time-calibration; piscivory.].
MeSH term(s)	Animals ; Characiformes/genetics ; Diet/veterinary ; Fossils ; Phylogeny
Language	English
Publishing date	2020-08-10
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
ZDB-ID	1482572-7
ISSN	1076-836X ; 1063-5157
ISSN (online)	1076-836X
ISSN	1063-5157
DOI	10.1093/sysbio/syaa065
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