caa a22 4500 469098333 CHVBK 20180323133037.0 cr unu---uuuuu 170328e19920401xx s 000 0 eng 10.1007/BF00317802 doi (NATIONALLICENCE)springer-10.1007/BF00317802 Variation in resource abundance affects diet and feeding morphology in the pumpkinseed sunfish ( Lepomis gibbosus ) [Elektronische Daten] [Gary Mittelbach, Craig Osenberg, Peter Wainwright] Summary: The pumpkinseed sunfish (Lepomis gibbosus Linnaeus; Centrarchidae) feeds extensively on molluscs, crushing them between its pharyngeal jaws. To address whether differences in mollusc availability might affect pumpkinseed diet and jaw morphology, we collected pumpkinseed from six Wisconsin lakes that varied in mollusc abundance and diversity. The percentage of molluscs in the diet increased directly with mollusc abundance. Moreover, there was a positive correlation between the mass of the pumpkinseed's main crushing muscle, the levator posterior, and the percentage of molluscs in the diet. These data support our previous work in two Michigan lakes showing that pumpkinseed pharyngeal jaws were more robust, and mollusc crushing performance improved, in a lake with higher mollusc densities. The combined Wisconsin and Michigan data exhibit a single relationship between levator posterior mass and percentage of molluscs eaten. Taken together, these studies demonstrate strong, functional relationships between prey availability, diet, morphology, and feeding performance, and suggest how morphology and feeding efficiency may evolve in response to variation in resource density. Springer-Verlag, 1992 Diet nationallicence Functional morphology nationallicence Lepomis nationallicence Molluscs nationallicence Mittelbach Gary Kellogg Biological Station, Michigan State University, 49060, Hickory Corners, MI, USA aut Osenberg Craig Marine Science Institute, University of California, 93106, Santa Barbara, CA, USA aut Wainwright Peter Department of Biological Sciences, Florida State University, 32306, Tallahassee, FL, USA aut Oecologia Springer-Verlag 90/1(1992-04-01), 8-13 0029-8549 90:1<8 1992 90 442 https://doi.org/10.1007/BF00317802 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00317802 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mittelbach Gary Kellogg Biological Station, Michigan State University, 49060, Hickory Corners, MI, USA aut NATIONALLICENCE 700 1- Osenberg Craig Marine Science Institute, University of California, 93106, Santa Barbara, CA, USA aut NATIONALLICENCE 700 1- Wainwright Peter Department of Biological Sciences, Florida State University, 32306, Tallahassee, FL, USA aut NATIONALLICENCE 773 0- Oecologia Springer-Verlag 90/1(1992-04-01), 8-13 0029-8549 90:1<8 1992 90 442 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer