Document Detail

Feeding and growth of apple snail Pomacea lineata in the Pantanal wetland, Brazil--a stable isotope approach.
MedLine Citation:
PMID:  12725426     Owner:  NLM     Status:  MEDLINE    
Apple snails Pomacea lineata (SPIX 1827) are widespread in the tropical regions of Brazil as well as in the Pantanal wetland of Mato Grosso in the western part of the country. They have a key position in the Pantanal food web and serve as food for many animals e.g. fishes, birds, and caimans. However, little is known about their feeding preferences and growth rates. Stable isotopes have been used successfully on numerous studies as food source indicator. Therefore, the delta15N and delta13C values of snails from 0.45 to 3.03 cm in length, which were collected in the rainy season from March through May, were analyzed. Snails signatures revealed ambiguous evidence for food preferences. Delta15N and delta13C values ranged between -2.8 and 12.4 per thousand and between -24.2 and -16.4, per thousand respectively. This range of values mirrors the highly variable isotope values of possible food sources comprising C3 and C4 macrophytes. To test whether all common food sources were similarly assimilated, feeding experiments with different diets were conducted. Snail eggs were reared in tanks and offered different but single plants. Snails fed different diets and delta13C values of the food were reflected in the animal tissue. Growth varied considerably in experiments with different diets indicating the preference for certain food sources. Also, the fractionation of nitrogen isotopes between food and animal varied from 0.1 to 17.0 per thousand. The results are explained by different feeding habits, and it is supposed that animals fed either on the plant itself or on bacteria mats growing in the tanks. In an additional experiment juvenile snails were offered one single food with a distinctive C4 grass signature. These snails did not grow detectably, but nevertheless isotope signatures approached to values of the diet.
C Fellerhoff
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Isotopes in environmental and health studies     Volume:  38     ISSN:  1025-6016     ISO Abbreviation:  Isotopes Environ Health Stud     Publication Date:  2002 Dec 
Date Detail:
Created Date:  2003-05-02     Completed Date:  2003-05-13     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9602611     Medline TA:  Isotopes Environ Health Stud     Country:  England    
Other Details:
Languages:  eng     Pagination:  227-43     Citation Subset:  IM    
Max-Planck-Institute of Limnology, Tropical Ecology Working Group, 24302 Plön, Germany.
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MeSH Terms
Carbon Isotopes / analysis
Nitrogen Isotopes / analysis
Population Dynamics
Snails / growth & development*
Reg. No./Substance:
0/Carbon Isotopes; 0/Nitrogen Isotopes

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