title: Negative influence of Gammarinema gammari (Nematoda) on the fecundity of Microphallus papillorobustus (Trematoda): field and experimental evidence.
abstract: The gammarid amphipod Gammarus insensibilis frequently harbors adult individuals of the ectoparasitic nematode Gammarinema gammari as well as metacercariae of the trematode Microphallus papillorobostus. After the demonstration in a previous study of a negative relationship between the abundance of these 2 parasites, the nature of the relationship between these 2 parasites was explored in more detail by studying, in the field and in the laboratory, the influence of nematode abundance on trematode fecundity. In gammarids collected in the field, a negative relationship between metacercarial fecundity and the number of co-occurring nematodes was found. By manipulating the nematode abundance in the laboratory, it was confirmed that G. gammari has a negative effect on egg production in M. papillorobustus.
authors.affiliation: Centre d'Etude sur le Polymorphisme des Micro-Organismes, CEPM/UMR CNRS-IRD 9926, Equipe: Evolution des Systèmes Symbiotiques, IRD, Montpellier, France.
authors.forename: C L
authors.initials: CL
authors.lastname: Wang
authors.forename: F
authors.initials: F
authors.lastname: Renaud
authors.forename: F
authors.initials: F
authors.lastname: Thomas
mesh_terms: D000818:Animals; D003445:Crustacea / Q000469:parasitology*; D005298:Fertility; D005602:France; D008297:Male; D009348:Nematoda / Q000254:growth & development*; D010270:Parasite Egg Count; D018709:Statistics, Nonparametric; D014200:Trematoda / Q000469:parasitology* / Q000502:physiology