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First description of epizoic ciliates (Sessilida Stein, 1933) on Bathyporeia Lindström, 1855 (Peracarida, Amphipoda) and infestation patterns in brackish and marine waters
In: CrustaceanaDuring a re-examination of macrozoobenthic samples from a long-term monitoring programme in the Dutch Oosterschelde and Westerschelde, the abundant presence of peritrich ciliates on specimens of Bathyporeia Lindström, 1855, was discovered. Out of the more than 3500 Bathyporeia specimens investigated, 44% contained ciliates. Although Bathyporeia sarsi Watkin, 1938 was significantly more often infested than Bathyporeia pilosa Lindström, 1855, these differences in infestation rates were largely due to differences between water bodies with higher infestation rates in the polyhaline than in the mesohaline reach. Observation of additionally collected living specimens and freshly preserved material showed that at least two, and likely three, species of ciliates are present of which two might be undescribed so far. One of the observed species matches Zoothamnium nanum Kahl, 1933. A second species belongs to the genus Epistylis Ehrenberg, 1830, but does not seem to match a so far known species. This also accounts for a possible third species belonging to the genus Zoothamnium Bory de St. Vincent, 1826, deviating from Z. nanum amongst others in the habitus of the stalk. The front part of Bathyporeia spp. and the antennae in particular, significantly more often harboured ciliates than the remainder of the body, where additional ciliates were only found on the ventral side. This shows that the peritrich ciliates benefit from the water currents induced by the basibiont, providing food items, but might also indicate that Bathyporeia spp. benefits from the presence of the epibionts as they are most prevalent on the body parts that are easiest to clean. Analyses of densities and distributions of epibiont and basibiont species gave first indications of the ecological niche of the peritrich ciliate communities.
Au cours du ré-examen d’échantillons macrozoobenthiques d’un programme de suivi à long terme dans l’Escaut oriental et occidental, la présence abondante de Ciliés Péritriches sur des spécimens de Bathyporeia Lindström, 1855, a été découverte. Sur plus de 3500 spécimens de Bathyporeia étudiés, 44% contenaient des ciliés. Bien que Bathyporeia sarsi Watkin, 1938 était significativement plus souvent infesté que Bathyporeia pilosa Lindström, 1855, ces différences dans les taux d’infestation étaient largement dues aux différences entre les masses d’eau avec des taux d’infestation supérieurs dans la zone polyhaline que dans la zone mésohaline. L’observation de spécimens additionnels collectés vivants et de matériel fraîchement conservés a montré que au moins deux, et probablement trois, espèces de Ciliés sont présentes dont deux pourraient être des espèces non décrites à ce jour. L’une des espèces observées correspond à Zoothamnium nanum Kahl, 1933. Une seconde espèce appartient au genre Epistylis Ehrenberg, 1830, mais ne semble correspondre à aucune espèce connue. Il en serait de même pour une possible troisième espèce appartenant au genre Zoothamnium Bory de St. Vincent, 1826, différant de Z. nanum notamment dans la forme du pédoncule. La partie antérieure de Bathyporeia spp. et les antennes en particulier, présentait significativement plus souvent des Ciliés que le reste du corps, où des Ciliés supplémentaires ont été trouvés uniquement du côté ventral. Ceci montre que les Ciliés Péritriches bénéficient des courants d’eau induits par l’hôte (basibionte), apportant les éléments nutritifs, mais pourrait aussi indiquer que les spécimens de Bathyporeia spp. bénéficient de la présence des épibiontes très répandus sur les parties du corps qui sont les plus faciles à nettoyer. Les analyses de densités et de répartition des espèces d’épibiontes et de leurs hôtes ont donné les premières indications sur la niche écologique des communautés de Ciliés Péritriches.
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| All Time | Past Year | Past 30 Days | |
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First description of epizoic ciliates (Sessilida Stein, 1933) on Bathyporeia Lindström, 1855 (Peracarida, Amphipoda) and infestation patterns in brackish and marine waters
In: CrustaceanaDuring a re-examination of macrozoobenthic samples from a long-term monitoring programme in the Dutch Oosterschelde and Westerschelde, the abundant presence of peritrich ciliates on specimens of Bathyporeia Lindström, 1855, was discovered. Out of the more than 3500 Bathyporeia specimens investigated, 44% contained ciliates. Although Bathyporeia sarsi Watkin, 1938 was significantly more often infested than Bathyporeia pilosa Lindström, 1855, these differences in infestation rates were largely due to differences between water bodies with higher infestation rates in the polyhaline than in the mesohaline reach. Observation of additionally collected living specimens and freshly preserved material showed that at least two, and likely three, species of ciliates are present of which two might be undescribed so far. One of the observed species matches Zoothamnium nanum Kahl, 1933. A second species belongs to the genus Epistylis Ehrenberg, 1830, but does not seem to match a so far known species. This also accounts for a possible third species belonging to the genus Zoothamnium Bory de St. Vincent, 1826, deviating from Z. nanum amongst others in the habitus of the stalk. The front part of Bathyporeia spp. and the antennae in particular, significantly more often harboured ciliates than the remainder of the body, where additional ciliates were only found on the ventral side. This shows that the peritrich ciliates benefit from the water currents induced by the basibiont, providing food items, but might also indicate that Bathyporeia spp. benefits from the presence of the epibionts as they are most prevalent on the body parts that are easiest to clean. Analyses of densities and distributions of epibiont and basibiont species gave first indications of the ecological niche of the peritrich ciliate communities.
| All Time | Past Year | Past 30 Days | |
|---|---|---|---|
| Abstract Views | 368 | 37 | 12 |
| Full Text Views | 245 | 0 | 0 |
| PDF Views & Downloads | 16 | 2 | 0 |