title: A new approach to quantifying morphological variation in bluegill Lepomis macrochirus.
abstract: Bluegill Lepomis macrochirus showed intraspecific morphological and behavioural differences dependent on the environment. Pelagic L. macrochirus had more fusiform bodies, a higher pectoral fin aspect ratio, a larger spiny dorsal fin area and pectoral fins located farther from the centre of mass than littoral L. macrochirus (P < 0·05). The shape of the body and pectoral fins, in particular, were suggestive of adaptation for sustained high-speed and economical labriform swimming. Littoral L. macrochirus had a deeper and wider body, deeper caudal fins and wider mouths than pelagic L. macrochirus (P < 0·05). Additionally, the soft dorsal, pelvic, anal and caudal fins of littoral L. macrochirus were positioned farther from the centre of mass (P < 0·05). The size and placement of these fins suggested that they will be effective in creating turning moments to facilitate manoeuvring in the macrophyte-dense littoral habitat.
authors.affiliation: Department of Biological Sciences, Wellesley College, Wellesley, MA 02481, USA. sgerry@wellesley.edu
authors.forename: S P
authors.initials: SP
authors.lastname: Gerry
authors.forename: J
authors.initials: J
authors.lastname: Wang
authors.forename: D J
authors.initials: DJ
authors.lastname: Ellerby
mesh_terms: D058500:Animal Fins / Q000033:anatomy & histology; D000818:Animals; D017753:Ecosystem; D005260:Female; D008124:Locomotion; D008297:Male; D010473:Perciformes / Q000033:anatomy & histology*