Nematomorph parasites indirectly alter the food web and ecosystem function of streams through behavioural manipulation of their cricket hosts.

Abstract:

:Nematomorph parasites manipulate crickets to enter streams where the parasites reproduce. These manipulated crickets become a substantial food subsidy for stream fishes. We used a field experiment to investigate how this subsidy affects the stream community and ecosystem function. When crickets were available, predatory fish ate fewer benthic invertebrates. The resulting release of the benthic invertebrate community from fish predation indirectly decreased the biomass of benthic algae and slightly increased leaf break-down rate. This is the first experimental demonstration that host manipulation by a parasite can reorganise a community and alter ecosystem function. Nematomorphs are common, and many other parasites have dramatic effects on host phenotypes, suggesting that similar effects of parasites on ecosystems might be widespread.

journal_name

Ecol Lett

journal_title

Ecology letters

authors

Sato T,Egusa T,Fukushima K,Oda T,Ohte N,Tokuchi N,Watanabe K,Kanaiwa M,Murakami I,Lafferty KD

doi

10.1111/j.1461-0248.2012.01798.x

subject

Has Abstract

pub_date

2012-08-01 00:00:00

pages

786-93

issue

8

eissn

1461-023X

issn

1461-0248

journal_volume

15

pub_type

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