Can members of the south-western Gila robusta species complex be distinguished by morphological features?

C. J. Moran, M. W. O'Neill, J. W. Armbruster, Alice C Gibb

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The goal for this project was to re-examine key morphological characters hypothesized to differentiate Gila intermedia, Gila robusta and Gila nigra and outline methods better suited for making species designations based on morphology. Using a combination of meristic counts, morphological measurements and geometric morphometrics, morphological dissimilarities were quantified among these three putative species. Traditional meristic counts and morphological measurements (i.e. distances between landmarks) were not useful for species identification. Geometric morphometrics, however, identified differences among species, while also suggesting an effect of geographic location on morphological variation. Using canonical variate analysis for the 441 fish sampled in this study, geometric morphometrics accurately predicted true group membership 100% of the time for G. nigra, 97% of the time for G. intermedia and 91% of the time for G. robusta. These results suggest that geometric morphometric analysis is necessary to identify morphological differences among the three species. Geometric morphometric analysis used in this study can be adopted by management officials as a tool to classify unidentified individuals.

Original languageEnglish (US)
JournalJournal of Fish Biology
DOIs
StateAccepted/In press - 2017

Fingerprint

species complex
interspecific variation
meristics
fish
Gila
Gila robusta
methodology
analysis
species identification

Keywords

  • Geometric morphometrics
  • Gila intermedia
  • Gila nigra
  • Hybridization
  • Species complex

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Aquatic Science

Cite this

Can members of the south-western Gila robusta species complex be distinguished by morphological features? / Moran, C. J.; O'Neill, M. W.; Armbruster, J. W.; Gibb, Alice C.

In: Journal of Fish Biology, 2017.

Research output: Contribution to journalArticle

@article{7821743e4e5f4022920fa343ebb03f1f,
title = "Can members of the south-western Gila robusta species complex be distinguished by morphological features?",
abstract = "The goal for this project was to re-examine key morphological characters hypothesized to differentiate Gila intermedia, Gila robusta and Gila nigra and outline methods better suited for making species designations based on morphology. Using a combination of meristic counts, morphological measurements and geometric morphometrics, morphological dissimilarities were quantified among these three putative species. Traditional meristic counts and morphological measurements (i.e. distances between landmarks) were not useful for species identification. Geometric morphometrics, however, identified differences among species, while also suggesting an effect of geographic location on morphological variation. Using canonical variate analysis for the 441 fish sampled in this study, geometric morphometrics accurately predicted true group membership 100{\%} of the time for G. nigra, 97{\%} of the time for G. intermedia and 91{\%} of the time for G. robusta. These results suggest that geometric morphometric analysis is necessary to identify morphological differences among the three species. Geometric morphometric analysis used in this study can be adopted by management officials as a tool to classify unidentified individuals.",
keywords = "Geometric morphometrics, Gila intermedia, Gila nigra, Hybridization, Species complex",
author = "Moran, {C. J.} and O'Neill, {M. W.} and Armbruster, {J. W.} and Gibb, {Alice C}",
year = "2017",
doi = "10.1111/jfb.13348",
language = "English (US)",
journal = "Journal of Fish Biology",
issn = "0022-1112",
publisher = "Wiley-Blackwell",

}

TY - JOUR

T1 - Can members of the south-western Gila robusta species complex be distinguished by morphological features?

AU - Moran, C. J.

AU - O'Neill, M. W.

AU - Armbruster, J. W.

AU - Gibb, Alice C

PY - 2017

Y1 - 2017

N2 - The goal for this project was to re-examine key morphological characters hypothesized to differentiate Gila intermedia, Gila robusta and Gila nigra and outline methods better suited for making species designations based on morphology. Using a combination of meristic counts, morphological measurements and geometric morphometrics, morphological dissimilarities were quantified among these three putative species. Traditional meristic counts and morphological measurements (i.e. distances between landmarks) were not useful for species identification. Geometric morphometrics, however, identified differences among species, while also suggesting an effect of geographic location on morphological variation. Using canonical variate analysis for the 441 fish sampled in this study, geometric morphometrics accurately predicted true group membership 100% of the time for G. nigra, 97% of the time for G. intermedia and 91% of the time for G. robusta. These results suggest that geometric morphometric analysis is necessary to identify morphological differences among the three species. Geometric morphometric analysis used in this study can be adopted by management officials as a tool to classify unidentified individuals.

AB - The goal for this project was to re-examine key morphological characters hypothesized to differentiate Gila intermedia, Gila robusta and Gila nigra and outline methods better suited for making species designations based on morphology. Using a combination of meristic counts, morphological measurements and geometric morphometrics, morphological dissimilarities were quantified among these three putative species. Traditional meristic counts and morphological measurements (i.e. distances between landmarks) were not useful for species identification. Geometric morphometrics, however, identified differences among species, while also suggesting an effect of geographic location on morphological variation. Using canonical variate analysis for the 441 fish sampled in this study, geometric morphometrics accurately predicted true group membership 100% of the time for G. nigra, 97% of the time for G. intermedia and 91% of the time for G. robusta. These results suggest that geometric morphometric analysis is necessary to identify morphological differences among the three species. Geometric morphometric analysis used in this study can be adopted by management officials as a tool to classify unidentified individuals.

KW - Geometric morphometrics

KW - Gila intermedia

KW - Gila nigra

KW - Hybridization

KW - Species complex

UR - http://www.scopus.com/inward/record.url?scp=85020171780&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85020171780&partnerID=8YFLogxK

U2 - 10.1111/jfb.13348

DO - 10.1111/jfb.13348

M3 - Article

C2 - 28589694

AN - SCOPUS:85020171780

JO - Journal of Fish Biology

JF - Journal of Fish Biology

SN - 0022-1112

ER -