Microhabitat distribution and coexistence of <i>Dactylogyrus</i> species (Monogenea) on the gills of roach

Koskivaara, M.; Valtonen, E. T.; Vuori, Kari-Matti

doi:10.1017/s0031182000061710

Cited by 58 publications

(39 citation statements)

References 19 publications

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“…In the same way, the increase in temperature during the warm season accelerated development of thermophilic dactylogyrids (Chubb 1977, Koskivaara et al 1992, as observed for D. formosus after 4 d of holding. According to Prost (1963), the temperature optimum for dactylogyrid reproduction (D. anchoratus) is 23°C.…”

Section: Discussionsupporting

confidence: 53%

Methodological issues affecting the study of fish parasites. I. Duration of live fish storage prior to dissection

Kvach¹,

Ondračková²,

Janáč³

et al. 2016

Dis. Aquat. Org.

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We tested the ability of parasite species to respond quickly to artificial conditions (e.g. by changing abundance or even decreasing to extinction) while host fish species were being held alive prior to dissection. Prussian carp Carassius gibelio were sampled by electrofishing from 2 ponds alongside the River Dyje (Czech Republic) during 'cold' and 'warm' seasons. All fish were transported to the laboratory in aerated pond water and kept in a 1 m 3 outdoor basin with aged tap water for 6 d. Twenty fish were dissected on consecutive days (total 120 fish for each site). Our results indicated that there was little change in parasite loading over the first 3 d of holding, suggesting no impact on parasitological studies undertaken over this period. From the fourth day, however, overall parasite abundance increased due to rapid reproduction of some parasite species, especially gyrodactylids in the cold season and dactylogyrids in the warm season. Parasite diversity appeared less stable in the warm season, with significant differences being registered as early as the second day. In addition to holding period, environmental conditions during fish holding will also play an important role in parasite community shifts.

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Section: Discussionsupporting

confidence: 53%

Methodological issues affecting the study of fish parasites. I. Duration of live fish storage prior to dissection

Kvach¹,

Ondračková²,

Janáč³

et al. 2016

Dis. Aquat. Org.

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“…Parasites, and specifically ectoparasites, seem to be an interesting model for such studies (Rohde 1991;Koskivaara et al 1992), as the hosts can be considered as the available islands . Monogenean ectoparasite communities are a useful ecological model for investigating the structure and organisation of communities (Rohde 1979;Morand et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Reproductive barriers between congeneric monogenean parasites (Dactylogyrus: Monogenea): attachment apparatus morphology or copulatory organ incompatibility?

et al. 2003

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Morphometrical parameters of the attachment apparatus and copulatory organs of 52 Dactylogyrus species parasitizing 17 species of cyprinid fishes were analysed to test for the existence of reproductive barriers among congeneric species. The minimal spanning tree (MST) method was applied in the analyses. The position of "real" parasite communities, based on (1) observed infracommunities, (2) a checklist of parasites for a given host in the morphological space, was compared to the position of randomly generated communities using all Dactylogyrus species. The distribution of species similarity within infracommunities (using both attachment and copulatory measurements) was not significantly different from that obtained by simulation, and this trend was similar for both the checklist and observed infracommunities. When real infracommunities were separated according to host specificity (specialists versus generalists), we found differences reflecting similarities in the shapes of attachment and copulatory organs. Within specialists, more similarities in the shape of the attachment apparatus can be found than within generalists, whereas the similarity in copulatory organ shape seems to be random. When generalists are considered, parasite infracommunities with the greater differences in attachment apparatus are also more different in terms of the shape of their copulatory apparatus. We conclude that specialist parasites possess more similarity in attachment apparatus due to specialisation to their host, whereas the species similarity in copulatory organs within infracommunities exhibits a random pattern, but with the copulatory organs being more variable than the attachment apparatus (which may be due to reproductive isolation). The morphology of the copulatory apparatus seems not to be the single factor explaining reproductive isolation among species.

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“…Marine fishes are useful models to investigate questions dealing with ecology of parasite community structure (Rohde 1989, Holmes 1990. Gill ectoparasites are increasingly used to investigate the evolutionary significance of extrinsic or intrinsic factors of niche restriction such as intra-or interspecific competi-tion, reinforcement of reproductive barriers and en-hancement of the chance to mate (Rohde 1977, 1979, 1980, 1989, 1994, Ramasamy et al 1985, Koskivaara et al 1992, Sharples and Evans 1995, Lo and Morand 2000. In a recent paper, Geets et al (1997), following Rohde's hypothesis (1991), suggested that interspecific competition be of secondary importance for microhabitat choice whereas intraspecific factors such as mating process and reinforcement of reproductive barriers affect exploitation of gill-space by parasites.…”

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confidence: 99%

Gill parasites of Cephalopholis argus (Teleostei: Serranidae) from Moorea (French Polynesia): site selection and coexistence

Lo¹,

Morand²

2001

FOLIA PARASIT

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Abstract. The distribution and coexistence of gill ectoparasites of 121 specimens of Cephalopholis argus Bloch et Schneider, caught between October 1994 and October 1995, were investigated. Adults of the monogenean Benedenia sp. and copepod Hatschekia sp., the larval caligid copepod Caligus sp. (copepodite and chalimus stages), and praniza larvae of the isopod Gnathia sp. were found. All species were aggregated within the host population. Infracommunities were poor, with only 40.5% of fish infected by two parasite species. Only two individual fish harboured all the parasite species observed at the component community level. Prevalences were less than 50% and mean intensities were low (less than 6 parasites/host). No dominant parasite species were observed in the host population. The spatial distribution of each parasite species was studied on different partitions of the gill arches. Adult parasite stages that are mobile showed much overlap in their distribution, whereas temporarily attached larvae of Caligidae were more site specific. Copepodite and chalimus larvae showed niche restriction that is probably due to gregarious behaviour. Positive associations between caligid larvae reflected intraspecific interaction for site and/or resources. Each of the Caligus sp. larval stages prefers specific sites, as do the adults, which occur exclusively in the buccal cavity of the host. Infracommunities were too poor and too few to induce processes of interspecific competition.Studies on parasites of coral reef fish remain scarce although it has been demonstrated that ectoparasite diversity is high in the tropics (Rohde 1976, 1978a, b, Rohde and Heap 1998. Investigations on coral reef fish parasites of oceanic islands in the southern Pacific are rare and only recently have studies been conducted in

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Microhabitat distribution and coexistence of Dactylogyrus species (Monogenea) on the gills of roach

Cited by 58 publications

References 19 publications

Methodological issues affecting the study of fish parasites. I. Duration of live fish storage prior to dissection

Methodological issues affecting the study of fish parasites. I. Duration of live fish storage prior to dissection

Reproductive barriers between congeneric monogenean parasites (Dactylogyrus: Monogenea): attachment apparatus morphology or copulatory organ incompatibility?

Gill parasites of Cephalopholis argus (Teleostei: Serranidae) from Moorea (French Polynesia): site selection and coexistence

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