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Found 8 results.

Stable isotope analysis of the common periwinkle Littorina littorea depending on infection status and seasonality

Littorina littorea was collected at the study site. The foot of Littorina littorea was used for stable isotope analysis (δ15N and δ13C). The stable isotope composition of possible food sources was also determined. Samples were taken in spring, summer and autumn. For the analysis a diet tissue discrimination factor (DTDF) of 2.4 for δ15N and 1.0 for δ13C was subtracted, respectively. The data in the sheet are the raw data without the DTDF.

Spatial pattern analysis for habitat composition and availability of food sources at Möltenort, Kiel Bight

The habitat at Möltenort was characterised with a 24 cm x 24 cm metal frame, which was thrown parallel to the coast 30 times within the 100 m transect. Coverage of Amphibalanus spp., Fucus vesiculosus, Gracilaria vermiculophylla, Mytilus spp., sand, stone, Ulva sp., and other ("other" indicating any category not mentioned in the list), was measured in 7 different percentage coverage groups (0, 1-5, 6-10, 11-20, 21-50, 51-75, or 76-100). Measurements were taken in spring, summer and autumn.

Habitat choice of the common periwinkle Littorina littorea depending on infection status and seasonality

Littorina littorea were collected from the habitat, screened for infection and marked before being released back into the environment. After 24 hours they were recollected and the habitat in which they were found was recorded. Their infection status was then checked by dissection.

The diet contribution and habitat selection of the common periwinkle Littorina littorea depending on infection with parasites and seasonality

The common periwinkle Littorina littorea is an ecologically important grazer and serves as the first intermediate host for several trematode species in the Baltic Sea, especially for the fluke Cryptocotyle lingua. In this series of experiments and analyses, we tested whether the food sources contributing to the diet and the habitat selection differ depending on the infection status of the periwinkle and the season. (1) A spatial pattern analysis was conducted to investigate the habitat composition and availability of food sources at the study site Möltenort, Kiel Bight (54.37°N, 10.19°E), (2) the habitat choice of the periwinkle was observed in-situ by a mark and recapture experiment, and (3) the composition of the diet of L. littorea (based on stable isotope composition of carbon and nitrogen isotopes) was analysed. All experiments were conducted in spring, summer and autumn.

Amount of shed cercariea of L. littorea with and without experimental crab presence

In this study, we examined how chemical cues from a predatory marine crab affect the transmission of a parasitic trematode from its first (periwinkle) to its second (mussel) intermediate host. We collected the data in a laboratory experiment. Here, snails (Littorina littorea) infected with a parasite (Himasthla elongata) were kept in two different treatments (with predation risk and control). Subsequently, the excreted cercariae were collected as data. The experiments were conducted at the Wadden Sea Station of the Alfred Wegener Institute in List, Sylt, Germany. We sampled the snails at the the Danish coast of the Baltic Sea (Jütland, Arosund; 55*15'45.8'N 9*42'39.2'E). Snails had a shell height of 14-18mm corresponding to an age of two years. Infection status were screened at the laboratory. The crabs for the predation cue were sampled at the Oddewatt, List Sylt (German, Wadden Sea). Only male crabs with a size og 20-30mm catapace width were sampled. The blue mussels were sampled at the west coast of Sylt (Wenningstedt beach) were trematode infection do not occur naturally (confirmed by screening 50 mussels).

Metacercariea in blue mussel (M. edulis) with and without experimental crab presence (transmission experiment, two hosts)

In this study, we examined how chemical cues from a predatory marine crab affect the transmission of a parasitic trematode from its first (periwinkle) to its second (mussel) intermediate host. We collected the data in a laboratory experiment. Here, snails (Littorina littorea) infected with a parasite (Himasthla elongata) were kept in two different treatments (with predation risk and control). Subsequently, the excreted cercariae were collected as data. The experiments were conducted at the Wadden Sea Station of the Alfred Wegener Institute in List, Sylt, Germany. We sampled the snails at the the Danish coast of the Baltic Sea (Jütland, Arosund; 55*15'45.8'N 9*42'39.2'E). Snails had a shell height of 14-18mm corresponding to an age of two years. Infection status were screened at the laboratory. The crabs for the predation cue were sampled at the Oddewatt, List Sylt (German, Wadden Sea). Only male crabs with a size og 20-30mm catapace width were sampled. The blue mussels were sampled at the west coast of Sylt (Wenningstedt beach) were trematode infection do not occur naturally (confirmed by screening 50 mussels). Mussel shell length wars 25-30mm.

Blue mussel (M. edulis) infection with metacercariea with and without experimental crab cue (one host)

In this study, we examined how chemical cues from a predatory marine crab affect the transmission of a parasitic trematode from its first (periwinkle) to its second (mussel) intermediate host. We collected the data in a laboratory experiment. Here, snails (Littorina littorea) infected with a parasite (Himasthla elongata) were kept in two different treatments (with predation risk and control). Subsequently, the excreted cercariae were collected as data. The experiments were conducted at the Wadden Sea Station of the Alfred Wegener Institute in List, Sylt, Germany. We sampled the snails at the the Danish coast of the Baltic Sea (Jütland, Arosund; 55*15'45.8'N 9*42'39.2'E). Snails had a shell height of 14-18mm corresponding to an age of two years. Infection status were screened at the laboratory. The crabs for the predation cue were sampled at the Oddewatt, List Sylt (German, Wadden Sea). Only male crabs with a size og 20-30mm catapace width were sampled. The blue mussels were sampled at the west coast of Sylt (Wenningstedt beach) were trematode infection do not occur naturally (confirmed by screening 50 mussels). Mussel shell length wars 25-30mm.

Parasite transmission from first to second intermediate trematode marine mollusc hosts under predation pressure

In this study, we examined how chemical cues from a predatory marine crab affect the transmission of a parasitic trematode from its first (periwinkle) to its second (mussel) intermediate host. We collected the data in a laboratory experiment. Here, snails (Littorina littorea) infected with a parasite (Himasthla elongata) were kept in two different treatments (with predation risk and control). Subsequently, the excreted cercariae were collected as data. The experiments were conducted at the Wadden Sea Station of the Alfred Wegener Institute in List, Sylt, Germany. We sampled the snails at the the Danish coast of the Baltic Sea (Jütland, Arosund; 55*15'45.8'N 9*42'39.2'E). Snails had a shell height of 14-18mm corresponding to an age of two years. Infection status were screened at the laboratory. The crabs for the predation cue were sampled at the Oddewatt, List Sylt (German, Wadden Sea). Only male crabs with a size og 20-30mm catapace width were sampled. The blue mussels were sampled at the west coast of Sylt (Wenningstedt beach) were trematode infection do not occur naturally (confirmed by screening 50 mussels). Mussel shell length wars 25-30mm. Sampling of the experimental organisms: Mytilus edulis (latitude:54.937.600, longitude: 8.312.915); Littorina littorea (latitude55.262.722:longitude:9.710.889 ) and Hemigrapsus takanoi (latitude:55.028.713longitude:8.434.260 ).

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