J 2000

Co-existence of nine gill ectoparasites(Dactylogyrus: Monogenea) parasitising the roach (Rutilus rutilus): history and present ecology

ŠIMKOVÁ, Andrea, Yves DESDEVISES, Milan GELNAR and Serge MORAND

Basic information

Original name

Co-existence of nine gill ectoparasites(Dactylogyrus: Monogenea) parasitising the roach (Rutilus rutilus): history and present ecology

Authors

ŠIMKOVÁ, Andrea (203 Czech Republic, guarantor), Yves DESDEVISES (250 France), Milan GELNAR (203 Czech Republic) and Serge MORAND (250 France)

Edition

International Journal for Parasitology, Austrálie, Elsevier, 2000, 0020-7519

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10600 1.6 Biological sciences

Country of publisher

Australia

Confidentiality degree

není předmětem státního či obchodního tajemství

Impact factor

Impact factor: 2.516

RIV identification code

RIV/00216224:14310/00:00007570

Organization unit

Faculty of Science

Keywords in English

Dactylogyrus; Monogenea; Species co-existence; Aggregation model; Comparative analysis

Tags

Změněno: 30/5/2003 09:38, prof. RNDr. Milan Gelnar, CSc.

Abstract

V originále

Co-existence among potentially competing species can be favoured by niche specialisation and/or by reducing the overall intensity of competition via aggregated utilisation of fragmented resources. We investigated the respective roles of niche specialisation and aggregation in the case of nine congeneric monogenean parasites on the gills of Roach (Rutilus rutilus L.) belonging to the genus Dactylogyrus. The position of each individual parasite of the nine Dactylogyrus species was recorded. Niche breadth and niche overlap of parasite species were estimated. Comparative methods, which take into account phylogenetic information of the analysed species, were used. We reconstructed a phylogeny of the nine Dactylogyrus species based on morphological characters. We used the `aggregation model of co-existence' in the model to test if species co-existence is facilitated when intraspecific aggregation exceeds interspecific aggregation. We observed a lack of negative correlation in abundance between pairs of parasites, and a negative correlation between niche size and parasite aggregation, for both intraspecific and interspecific aggregation. Our comparative analysis showed that parasite abundance is positively correlated with niche breadth. Then parasite abundance, and not interactions between Dactylogyrus species, seems to be the most important factor determining niche size This result gives some support to niche segregation by specialisation. Niche size was negatively correlated with both intraspecific and interspecific aggregation. No relationship was found between an increase of interspecific aggregation with an increase of niche overlapping, which suggests that competition may play little role. A lack of competition could be also confirmed by the lack of negative correlation in abundance between species pairs. A parsimony analysis of the evolution of gill distribution indicates a change in one parameter of the niche (arch, segment and/or area) at each branching event.

Links

GA524/98/0940, research and development project
Name: Diverzita parazitů jako indikátor enviromentálního stresu
Investor: Czech Science Foundation, Diversity of parasites like an indicator of environmental stress
MSM 143100010, plan (intention)
Name: Časoprostorová dynamika biodiverzity v ekosystémech střední Evropy.
Investor: Ministry of Education, Youth and Sports of the CR, Spatiotemporal biodiversity dynamics in ecosystems of Central Europe