Impact of trematode infections on periphyton grazing rates of freshwater snails.

Abstract:

:In freshwater ecosystems, snails can significantly influence the competition between primary producers through grazing of periphyton. This activity can potentially be modified by trematodes, a large group of parasites which mostly use molluscs as the first intermediate host. Available studies, however, show contradictory effects of trematodes on snail periphyton grazing. Here, we used four different freshwater snail-trematode systems to test whether a general pattern can be detected for the impact of trematode infections on snail periphyton grazing. In our experimental systems, mass-specific periphyton grazing rates of infected snails were higher, lower, or similar to rates of non-infected conspecifics, suggesting that no general pattern exists. The variation across studied snail-trematode systems may result from differences on how the parasite uses the resources of the snail and thus affects their energy budget. Trematode infections can significantly alter the grazing rate of snails, where, depending on the system, the mass-specific grazing rate can double or halve. This underlines both, the high ecological relevance of trematodes and the need for comprehensive studies at the species level to allow an integration of these parasite-host interactions into aquatic food web concepts.

journal_name

Parasitol Res

journal_title

Parasitology research

authors

Vivas Muñoz JC,Hilt S,Horák P,Knopf K

doi

10.1007/s00436-018-6052-y

subject

Has Abstract

pub_date

2018-11-01 00:00:00

pages

3547-3555

issue

11

eissn

0932-0113

issn

1432-1955

pii

10.1007/s00436-018-6052-y

journal_volume

117

pub_type

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