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We conducted two experiments to assess the predation of female H. takanoi (a non-native species in the Baltic) on a native gammarid (Gammarus duebeni) and a non-native analogous gammarid (Gammarus tigrinus). In the first experiment, we examined the functional response of female H. takanoi to G. duebeni and G. tigrinus. The experiments were conducted at the GEOMAR Helmholtz Centre for Ocean Research Kiel. Crabs were sampled in the innermost part of the Kiel Fjord, Germany (59°19'44N, 10°08'55.5E) during the summer of 2021. The experimental design utilized a fully factorial approach. One temperature (16°C) and one salinity (10) across five prey densities (1, 2, 4, 8, 16) were used. Each combination was replicated three times, alongside three replicates of predator-free controls at each prey density to quantify background prey mortality. The crabs were starved for 48 hours ahead of the experiment and were exposed to the respective number of gammarids for a 6-hour feeding period. The number of gammarids consumed was recorded.
We conducted two experiments to assess the predation of female H. takanoi (a non-native species in the Baltic) on a native gammarid (Gammarus duebeni) and a non-native analogous gammarid (Gammarus tigrinus). The experiments were conducted at the GEOMAR Helmholtz Centre for Ocean Research Kiel. Crabs were sampled in the innermost part of the Kiel Fjord, Germany (59°19'44N, 10°08'55.5E) during the summer of 2021. This experiment covered a prey-switching trial where both prey species were offered simultaneously in varying densities (2:14, 4:12, 6:10, 8:8, 10:6, 12:4, 14:2; n = 6 replicates per ratio); once again, the amount of consumed prey per species was assessed after 6 hours of feeding by H. takanoi. All remaining parameters were the same as described for Experiment No. 1.
Field and Laboratory experiments were performed to study the feeding ecology of Hemigrpasus takanoi and C. maenas. Experiments were done between 2017-2020 on oyster reefs near the island of Sylt (Wadden Sea, North Sea). Data were collected to investigate the effect of a non-native crab species on native community. We used exclusion experiments in the field and feeding experiments under controlled conditions at the lab.
Field and Laboratory experiments were performed to study the feeding ecology of Hemigrpasus takanoi and C. maenas. Experiments were done between 2017-2020 on oyster reefs near the island of Sylt (Wadden Sea, North Sea). Data were collected to investigate the effect of a non-native crab species on native community. We used exclusion experiments in the field and feeding experiments under controlled conditions at the lab.
Field and Laboratory experiments were performed to study the feeding ecology of Hemigrpasus takanoi and C. maenas. Experiments were done between 2017-2020 on oyster reefs near the island of Sylt (Wadden Sea, North Sea). Data were collected to investigate the effect of a non-native crab species on native community. We used exclusion experiments in the field and feeding experiments under controlled conditions at the lab.
Field and Laboratory experiments were performed to study the feeding ecology of Hemigrpasus takanoi and C. maenas. Experiments were done between 2017-2020 on oyster reefs near the island of Sylt (Wadden Sea, North Sea). Data were collected to investigate the effect of a non-native crab species on native community. We used exclusion experiments in the field and feeding experiments under controlled conditions at the lab.
Field and Laboratory experiments were performed to study the feeding ecology of Hemigrpasus takanoi and C. maenas. Experiments were done between 2017-2020 on oyster reefs near the island of Sylt (Wadden Sea, North Sea). Data were collected to investigate the effect of a non-native crab species on native community. We used exclusion experiments in the field and feeding experiments under controlled conditions at the lab.
Field and Laboratory experiments were performed to study the feeding ecology of Hemigrpasus takanoi and C. maenas. Experiments were done between 2017-2020 on oyster reefs near the island of Sylt (Wadden Sea, North Sea). Data were collected to investigate the effect of a non-native crab species on native community. We used exclusion experiments in the field and feeding experiments under controlled conditions at the lab.
Field and Laboratory experiments were performed to study the feeding ecology of Hemigrpasus takanoi and C. maenas. Experiments were done between 2017-2020 on oyster reefs near the island of Sylt (Wadden Sea, North Sea). Data were collected to investigate the effect of a non-native crab species on native community. We used exclusion experiments in the field and feeding experiments under controlled conditions at the lab.
Field and Laboratory experiments were performed to study the feeding ecology of Hemigrpasus takanoi and C. maenas. Experiments were done between 2017-2020 on oyster reefs near the island of Sylt (Wadden Sea, North Sea). Data were collected to investigate the effect of a non-native crab species on native community. We used exclusion experiments in the field and feeding experiments under controlled conditions at the lab.
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