Limnocnida tanganyicae medusae (Cnidaria: Hydrozoa): a semiautonomous microcosm in the food web of Lake Tanganyika

Salonen, Kalevi; Högmander, Pia; Langenberg, Victor; Mölsä, Hannu; Sarvala, Jouko; Tarvainen, Anne; Tiirola, Marja

doi:10.1007/978-94-007-5316-7_8

Cited by 2 publications

(7 citation statements)

References 54 publications

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“…open sci. 6: 191053 by internal seiching that leads to water mixing and upward nutrient fluxes [18,22]. A previous bloom was documented to have reached approximately 3000 individuals m −3 by the coastline near Mpulungu, Zambia [18].…”

Section: Freshwater Jellyfish Of Lake Tanganyikamentioning

confidence: 99%

“…Limnocnida tanganjicae (Hydrozoa, Cnidaria) is the only documented species of jellyfish present in Lake Tanganyika [19] and is typically found throughout the oxygenated water column in the upper 100 m [18]. While not a 'true' scyphozoan jellyfish, L. tanganjicae is a major part of the zooplankton community in the lake [20] though it has received very little research attention relative to other fauna in Lake Tanganyika [21].…”

Section: Freshwater Jellyfish Of Lake Tanganyikamentioning

confidence: 99%

“…6: 191053 by internal seiching that leads to water mixing and upward nutrient fluxes [18,22]. A previous bloom was documented to have reached approximately 3000 individuals m −3 by the coastline near Mpulungu, Zambia [18]. To avoid harmful UV radiation in the upper layers during day times with peak radiation, L. tanganjicae undergo low amplitude diel vertical migrations [18].…”

Section: Freshwater Jellyfish Of Lake Tanganyikamentioning

confidence: 99%

“…A previous bloom was documented to have reached approximately 3000 individuals m −3 by the coastline near Mpulungu, Zambia [18]. To avoid harmful UV radiation in the upper layers during day times with peak radiation, L. tanganjicae undergo low amplitude diel vertical migrations [18]. Exposure of L. tanganjicae to UV radiation at surface waters (top 5 m) during midday leads to mortality within 1 h [18].…”

Section: Freshwater Jellyfish Of Lake Tanganyikamentioning

confidence: 99%

“…Variabilichromis moorii is a socially monogamous and biparental species of cichlid fish, and like many Tanganyikan cichlids, V. moorii is highly territorial and ecologically constrained to rocky littoral habitats. Thus, it is unable to actively relocate to avoid jellyfish blooms, which can sometimes span areas covering several hundreds of square kilometres [18]; instead, male-female social pairs, as well as solitary territory-owners, remain on their territories during the blooms despite the large numbers of jellyfish that they encounter. Variabilichromis moorii pairs hold territories (1-4 m 2 ) containing several rocky crevices where they can take shelter, graze on algae and raise offspring.…”

Section: Introductionmentioning

confidence: 99%

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Freshwater hydrozoan blooms alter activity and behaviour of territorial cichlids in Lake Tanganyika

2019

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Blooms of gelatinous zooplankton can represent dramatic environmental perturbations for aquatic ecosystems. Yet, we still know little about how blooms impact fitness-related behaviours of fish caught within their areas of effect, especially for freshwater systems. Here, we documented the behavioural impacts of freshwater hydrozoan (Limnocnida tanganjicae) blooms on a territorial cichlid (Variabilichromis moorii), as well as on the wider community of cichlids in a shallow-water rocky habitat of Lake Tanganyika. Compared with non-bloom conditions, V. moorii individuals in the midst of blooms reduced their swimming and territory defence activities (each by approx. 50%) but not their foraging or affiliative behaviours. Despite this reduction in activity, V. moorii could not entirely avoid being stung and preferred to remain closer to the rocky substrata as opposed to the more open demersal zone. Many other fishes similarly hid among the benthic substrata, changing the composition of the fish community in the demersal zone during bloom conditions. Reductions in activity could have multiple fitness-related implications for individual fish. Establishing the consequences of these behavioural changes is important for understanding the effects of gelatinous zooplankton blooms in freshwater systems.

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Section: Freshwater Jellyfish Of Lake Tanganyikamentioning

confidence: 99%

Section: Freshwater Jellyfish Of Lake Tanganyikamentioning

confidence: 99%

Section: Freshwater Jellyfish Of Lake Tanganyikamentioning

confidence: 99%

Section: Freshwater Jellyfish Of Lake Tanganyikamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Freshwater hydrozoan blooms alter activity and behaviour of territorial cichlids in Lake Tanganyika

2019

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Predicting the current and future global distribution of the invasive freshwater hydrozoan Craspedacusta sowerbii

Marchessaux

Lüskow

Sarà

et al. 2021

Sci Rep

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The freshwater jellyfish Craspedacusta sowerbii is one of the most widespread invasive species, but its global distribution remains uncertain due to ephemeral appearances and general lack of information in various aquatic environments. The aim of this study was to map current and future distributions (2050 and 2100) using Species Distribution Models allowing to visualize the habitat suitability and make projections of its changes under potential climate change scenarios. Except in Oceania where the range decreased, an expansion of C. sowerbii was projected during the next century under modeled future scenarios being most intensive during the first half of the century. The present study shows that the expansion of C. sowerbii worldwide would be facilitated mainly by precipitation, vapor pressure, and temperature. The predictions showed that this species over the eighty years will invade high-latitude regions in both hemispheres with ecological consequences in already threatened freshwater ecosystems.

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Limnocnida tanganyicae medusae (Cnidaria: Hydrozoa): a semiautonomous microcosm in the food web of Lake Tanganyika

Cited by 2 publications

References 54 publications

Freshwater hydrozoan blooms alter activity and behaviour of territorial cichlids in Lake Tanganyika

Freshwater hydrozoan blooms alter activity and behaviour of territorial cichlids in Lake Tanganyika

Predicting the current and future global distribution of the invasive freshwater hydrozoan Craspedacusta sowerbii

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