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Found 21 results.

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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.

Experiment on the functional response of non-indigenous crab Hemigrapsus takanoi across seasons and temperatures in the Baltic Sea

We examined the functional response of the Japanese brush-clawed shore crab ( Hemigrapsus takanoi ) towards blue mussels ( Mytilus sp.) across four seasons for an ambient and +6 °C future warming scenario in the Baltic Sea. The experiment was carried out as a laboratory experiment at the GEOMAR Helmholtz Centre for Ocean Research Kiel. Crabs were sampled in the innermost part of the Kiel Fjord, Germany (54°19′44.8″ N, 10°08′55.5″ E) between Summer 2021 and Spring 2023 during the respective season. The experimental design used a fully factorial approach, examining the functional response across two temperatures, two sexes, and eight prey densities (1, 2, 4, 6, 8, 16, 32, 64) across four seasons. Each crab was subjected to a pre-experiment 48-hour starvation period and then exposed to a fixed number of mussels for a 72-hour feeding trial. The number of mussels consumed was recorded, providing data on the predatory impact of H. takanoi under varying temperature scenarios and across seasons.

Long-term averages of mean annual temperatures (MAT), the respective summer (July/August) and winter (Dec/Jan) temperatures and δ18Oprecipitation values of 84 European sites (GNIP, IAEA/WMO, 2023)

The dataset contains long‐term means of δ18Oprecipitation values and temperatures from 84 European sites (GNIP database; IAEA/WMO, 2023), which were used to estimate mean annual (palaeo-) temperatures from the measured oxygen isotope data on horse tooth enamel phosphate. Mean temperatures of the warmest (July/August) and coldest (December/January) periods were considered representative for summer and winter temperatures, respectively, using the peak and trough values of the modelled phosphate data for their calculation.

Experiment on seagrass (Zostera marina) response to chronically elevated temperature: temperature regimes in benthocosms

This study simulated a 9-months warming scenario on the common seagrass Zostera marina from winter into summer (December 2015 - August 2016) in the Western Baltic Sea (Kiel Fijord), using outdoor mesocosms. Two treatments were applied: Ambient temperature regime (Ambient) and Ambient + 3.6C (Heat) over the entire course of the experiment. Temperature regimes were compared to the 22-year temperature average in the area. This dataset shows continues temperature data for each benthocosm and the adjacent fjord. Benthocosms A1, A2, C1, C2, E1, E2 = Heat; Benthocosms B1, B2, D1, D2, F1, F2 = Ambient.

Seasonality of damage-inducing torrential events in Austria (1962-2017)

Frequency of damage-inducing torrential events in Austria (1962-2017)

Frequency, magnitude and seasonality of damage-inducing torrential events in Austria (1962-2017)

Information on frequency, magnitude and seasonality of damage-inducing torrential flooding events from steep, alpine headwater catchments (torrents) in Austria, for the period from 1962 to 2017. The datasets are based on information from the Austrian torrential event catalogue. The frequency data set is complemented with information on the number of functional torrential structures (technical mitigation measures), the number of exposed buildings as well as a multitude of climate indices related to precipitation, snow melt and the sum of precipitation plus snowmelt. Annual aggregates are derived by using area-weighted means across all catchments.

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