Predation of freshwater jellyfish on Bosmina: the consequences for population dynamics, body size, and morphology

Jankowski, Thomas

doi:10.1007/978-1-4020-2762-8_59

Cited by 7 publications

(2 citation statements)

References 29 publications

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“…Furthermore, blooms of freshwater jellyfish have been regularly observed and are often followed by a decline in crustacean zooplankton (Dumont, 1994), suggesting strong predation pressure. Additionally, there is some evidence for morphological changes in bosminid populations in the presence of C. sowerbii (Jankowski, 2004).…”

Section: Introductionmentioning

confidence: 99%

Trophic interactions of the freshwater jellyfish Craspedacusta sowerbii

Jankowski¹,

Strauß²,

Ratte³

2005

Journal of Plankton Research

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The predatory impact and the trophic role of the freshwater jellyfish, Craspedacusta sowerbii, was studied using microcosm and enclosure experiments as well as a 3-year pond survey. The results showed a significant decrease of small herbivorous crustaceans, i.e. Bosmina longirostris and juvenile cyclopoid copepods, in the medusa treatments of the microcosms and the enclosure experiments. Chlorophyll concentrations in the enclosure experiment were significantly increased in the medusa treatment, suggesting that C. sowerbii may cause cascading effects in the food chain. A comparison of daily zooplankton losses during the pond survey caused by medusae and fish (roach, Rutilus rutilus), and their food selectivities suggest food separation of these two predators and reveal a strong negative impact of medusae on the copepod pond community. In the case of a jellyfish bloom, our results show that both food chains can co-occur in lakes because of a weak interaction between these top predators, fish and jellyfish, with simultaneous impacts on the zooplankton structure.

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Section: Introductionmentioning

confidence: 99%

Trophic interactions of the freshwater jellyfish Craspedacusta sowerbii

Jankowski¹,

Strauß²,

Ratte³

2005

Journal of Plankton Research

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“…maritima has increased in the study area during the investigated time period, based on the number of ephippia and exoskeleton remains in the sediment layers, which suggests favorable growth conditions. Life‐history traits of water fleas are known to be flexible and vary in response to changes in the quantity and quality of resources (Urabe and Sterner ; Acharya et al ) as well as in predation pressure (Kerfoot ; Jankowski ). During favorable conditions, fecundity is high, and Bosmina populations can grow rapidly through parthenogenesis (Kankaala and Wulff ; Hanazato and Yasuno ).…”

Section: Discussionmentioning

confidence: 99%

Long‐term changes in a zooplankton community revealed by the sediment archive

Vehmaa

Katajisto

Candolin

2018

Limnology & Oceanography

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To reconstruct changes in zooplankton communities in response to past anthropogenic perturbations, one possibility is to use the sedimentary records. We analyzed the sediments at a coastal site in the Northern Baltic Sea to relate changes in the zooplankton community to anthropogenic eutrophication and the invasion of a predatory cladoceran, Cercopagis pengoi. We sampled 30‐cm laminated sediment cores and dated the sediment layers back to the 1950s. From each 1‐cm layer, we measured eutrophication indicators (δ13C, δ15N, TC, TN, TP) and identified and counted zooplankton resting eggs (cladoceran, calanoid copepod, rotifer). In addition, we estimated the abundance of the cladoceran Bosmina (Eubosmina) maritima by counting subfossils (carapaces, headshields, and ephippia) and estimated the experienced stress as the relationship between sexual and asexual reproduction. Using redundancy and variance partitioning analyses, we found ∼ 16% of the variation in the zooplankton community to be explained by eutrophication, and 24% of the variation in B. (E.) maritima abundance and reproduction mode to be explained by eutrophication and the introduction of the alien predator. Our results show a long‐term shift from calanoid copepods and predatory cladocerans toward small‐sized zooplankton species, like rotifers. Furthermore, the results indicate that the invasion of C. pengoi induced a short‐term increase in sexual reproduction in B. (E.) maritima. The results indicate that anthropogenic eutrophication since the 1950s has altered the zooplankton community toward smaller species, while the invasion of the predatory cladoceran had only a transitory influence on the community during its expansion phase.

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Diet composition and prey selection of vendace Coregonus albula in the mesotrophic, temperate Lake Ostrowite (Northern Poland)

Kakareko

Napiórkowski

Kozłowski

2008

Oceanological and Hydrobiological Studies

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Lake Ostrowite is a mesotrophic lake in Northern Poland 280.7 ha in area and 43 m deep at its deepest point. To study vendace (Coregonus albula L.) diet in the lake, fish and zooplankton were sampled at two stations on 28-29 April, 15-16 May (fish only), 28-29 July and 15-16 August 2004. Fish were caught by gill netting, while zooplankton was collected from the whole water column by means of a Ruttner sampler (5 × 2 dm 3 ). In total 91 vendace specimens were analysed, of which 64.8% had non-empty alimentary tracts. In the April and May samples Copepoda were

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Predation of freshwater jellyfish on Bosmina: the consequences for population dynamics, body size, and morphology

Cited by 7 publications

References 29 publications

Trophic interactions of the freshwater jellyfish Craspedacusta sowerbii

Trophic interactions of the freshwater jellyfish Craspedacusta sowerbii

Long‐term changes in a zooplankton community revealed by the sediment archive

Diet composition and prey selection of vendace Coregonus albula in the mesotrophic, temperate Lake Ostrowite (Northern Poland)

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