Ontogenetic changes in pharyngeal morphology correlate with a diet shift from arthropods to dreissenid mussels in round gobies (Neogobius melanostomus)

被引:20
作者
Andraso, Greg [1 ]
Cowles, James [1 ]
Colt, Rose [1 ]
Patel, Jay [2 ]
Campbell, Michael [2 ]
机构
[1] Gannon Univ, Dept Biol, Erie, PA 16541 USA
[2] Penn State Univ, Behrend Coll, Sch Sci, Erie, PA 16563 USA
关键词
Round goby; Dreissenid; Predation; Invasive species; Pharyngeals; ASTATOREOCHROMIS-ALLUAUDI TELEOSTEI; SIZE-SELECTIVE PREDATION; PHENOTYPIC PLASTICITY; FISHES; GOBY;
D O I
10.1016/j.jglr.2011.07.011
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The potential of predators to regulate populations of dreissenid mussels (Dreissena polymorpha and Dreissena rostriformis bugensis) has been addressed since early in the dreissenid invasion of North America. Round gobies (Neogobius melanostomus) larger than approximately 60 mm have been shown to prey extensively on dreissenids, whereas smaller round gobies feed mainly on aquatic insects and crustaceans. We propose that ontogenetic changes in pharyngeal morphology may contribute to this diet shift in round gobies. Pharyngeals of 69 round gobies ranging from 31 to 164 mm total length were investigated using light microscopy and scanning electron microscopy. Areas of lower pharyngeals and pharyngobranchial 2 increased allometrically with fish length. Pharyngeals of round gobies smaller than 50 mm contained narrow (<0.1 mm diameter) papilliform teeth that are consistent with eating soft-bodied prey. By the time round gobies reached approximately 80 mm in length, pharyngeals contained larger diameter (0.3-0.5 mm) molariform teeth typical of those found in molluscivorous fish. Pharyngeal teeth of the largest round gobies also showed considerable wear. Although changes in pharyngeal morphology may contribute to the previously described diet shift in round gobies as they age, genetic and environmental factors both likely influence pharyngeal remodeling and therefore merit further investigation. (C) 2011 International Association for Great Lakes Research. Published by Elsevier B.V. All rights reserved.
引用
收藏
页码:738 / 743
页数:6
相关论文
共 31 条
[1]   Size-selective predation by round gobies (Neogobius melanostomus) on dreissenid mussels in the field [J].
Andraso, Gregory M. ;
Ganger, Michael T. ;
Adamczyk, Jenna .
JOURNAL OF GREAT LAKES RESEARCH, 2011, 37 (02) :298-304
[2]  
BAREL CDN, 1977, NETH J ZOOL, V27, P333
[3]   Scaling of limb proportions in monitor lizards (Squamata: Varanidae) [J].
Christian, A ;
Garland, T .
JOURNAL OF HERPETOLOGY, 1996, 30 (02) :219-230
[4]   ROLE OF TIME AND ENERGY IN FOOD PREFERENCE [J].
EMLEN, JM .
AMERICAN NATURALIST, 1966, 100 (916) :611-+
[5]  
French John R.P. III, 1993, P453
[6]  
FRENCH JRP, 1993, FISHERIES, V18, P13, DOI 10.1577/1548-8446(1993)018<0013:HWCFPO>2.0.CO
[7]  
2
[8]   Pharyngeal teeth of the freshwater drum (Aplodinotus grunniens) a predator of the zebra mussel (Dreissena polymorpha) [J].
French, JRP .
JOURNAL OF FRESHWATER ECOLOGY, 1997, 12 (03) :495-498
[9]   Zebra mussel predation by round gobies in the laboratory [J].
Ghedotti, MJ ;
Smihula, JC ;
Smith, GR .
JOURNAL OF GREAT LAKES RESEARCH, 1995, 21 (04) :665-669
[10]  
Helfman G. S., 2009, The Diversity of Fishes: Biology, Evolution, and Ecology