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Do the changes in temperature and light affect the functional response of the benthic mud snail Heleobia australis (Mollusca: Gastropoda)?
MedLine Citation:
PMID:  25014915     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The aim of this study was to determine the influence of temperature increase combined to conditions of light incidence on functional response of Heleobia australis. Experiments were conducted using nine to ten food concentrations for each treatment: 20°C without light; 30°C without light and, 30°C under low light intensity. For each experiment, the functional response type III (sigmoidal) was fitted and equation parameters were determined. Results suggest that, if the sediment temperature increases, H. australis will not have its ingestion rates affected negatively, whilst its feeding behavior seems to be negatively affected by light. Ingestion rates estimated for organic content in the Guanabara Bay were: 0.34 µgC ind-1h-1 at 20°C without light, 1.44 µgC ind-1h-1 at 30°C without light and 0.64 µgC ind-1h-1 at 30°C under light incidence. Higher ingestion rates were estimated at the high temperature, even under light incidence, and temperature seems to have outweighed the light effect. In contrast, if higher carbon content is considered, despite high temperature, the experiment conducted with light incidence showed lower ingestion rates than those from the experiment at 20°C without light. This study provides the first quantification of H. australis ingestion rates and the effects that changes in temperature and light have on its feeding behavior.
Authors:
Thaisa R F Magalhães; Raquel A F Neves; Jean L Valentin; Gisela M Figueiredo
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-7-11
Journal Detail:
Title:  Anais da Academia Brasileira de Ciencias     Volume:  0     ISSN:  1678-2690     ISO Abbreviation:  An. Acad. Bras. Cienc.     Publication Date:  2014 Jul 
Date Detail:
Created Date:  2014-7-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7503280     Medline TA:  An Acad Bras Cienc     Country:  -    
Other Details:
Languages:  ENG     Pagination:  0     Citation Subset:  -    
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