Document Detail

Phenotypic plasticity in gut length in the planktivorous filter-feeding silver carp (Hypophthalmichthys molitrix).
MedLine Citation:
PMID:  18301818     Owner:  NLM     Status:  MEDLINE    
Phenotypic plasticity widely exists in the external morphology of animals as well as the internal traits of organs. In the present study, we studied the gut length plasticity of planktivorous filter-feeding silver carp under different food resources in large-net cage experiments in Meiliang Bay of Lake Taihu in 2004 and 2005. There was a significant difference in stocking density between these 2 years. Under a low stocking density and abundant food resources, silver carp increased their energy intake by feeding on more zooplankton. Meanwhile, silver carp adjusted their gut length to match the digestive requirements of food when exposed to different food resources. In the main growth seasons (from April to October), silver carp significantly increased their relative gut length when feeding on more phytoplankton in 2005 (p < 0.01, 9.23 +/- 1.80 in 2004 and 10.77 +/- 2.05 in 2005, respectively). There was a nearly significant negative correlation between zooplankton proportion in the diet and the relative gut length when silver carp were stocked in a high density (p = 0.112). It appears that silver carp might have evolved plasticity to change their gut length rapidly to facilitate efficient utilization of food resources. Such resource polymorphisms in the gut may be a good indication of temporal adaptation to resource conditions. Our work provided field evidence for understanding the functional basis of resource polymorphisms and the evolution of phenotypic plasticity in planktivorous filter-feeding fish.
Zhixin Ke; Xie Ping; Longgen Guo
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-02-19
Journal Detail:
Title:  TheScientificWorldJournal     Volume:  8     ISSN:  1537-744X     ISO Abbreviation:  ScientificWorldJournal     Publication Date:  2008  
Date Detail:
Created Date:  2008-02-27     Completed Date:  2008-03-11     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  101131163     Medline TA:  ScientificWorldJournal     Country:  England    
Other Details:
Languages:  eng     Pagination:  169-75     Citation Subset:  IM    
Donghu Experimental Station of Lake Ecosystems, State Key Laboratory for Freshwater Ecology and Biotechnology of China, Institute of Hydrobiology, The Chinese Academy of Sciences, Wuhan 430072, PR China.
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MeSH Terms
Animal Nutritional Physiological Phenomena*
Carps / physiology*
Feeding Behavior
Fresh Water
Gastrointestinal Tract / anatomy & histology*,  physiology*
Zooplankton / physiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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