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

Bose, Aneesh P. H.; Zimmermann, Holger; Sefc, Kristina M.

doi:10.1098/rsos.191053

Cited by 7 publications

(2 citation statements)

References 43 publications

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“…Craspedacusta is known to form short-lived blooms (i.e. a few weeks), even in the presence of high numbers of fish (Jankowski et al 2005), while the tropical freshwater medusa Limnocnida tanganjicae is avoided by fish in Lake Tanganyika, despite being of a suitable size (Bose et al 2019). Trophic cascade effects have been shown several times when medusae are abundant (Jankowski & Ratte 2000, Jankowski 2004, Jankowski et al 2005, and symbiotic interactions are rarely documented (Ludwig et al 1979, Stanko vić & Ternjej 2010, Morpurgo et al 2021.…”

Section: Introductionmentioning

confidence: 99%

Freshwater jellyfish in northern temperate lakes: Craspedacusta sowerbii in British Columbia, Canada

2021

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Freshwater jellyfish species of the genus Craspedacusta purportedly originated from the Yangtze River catchment area, China, and have now been observed on all continents except Antarctica. Sightings of C. sowerbii in the Pacific regions of Canada were compiled to document some of the northernmost records of this species in the Americas. Species identification has been difficult in the past. Therefore, field collection of specimens was carried out on southern Vancouver Island. The morphology was described macro- and microscopically as well as molecularly using mitochondrial and nuclear markers. Collected hydromedusae from British Columbia (BC) did not deviate morphologically from C. sowerbii specimens from other continents, but molecular analyses support the idea of 2 main widely distributed lineages hidden under similar morphological features (i.e. a species complex). Through a community science approach, an understanding of the extent of C. sowerbii distribution in western and southern BC (present in 24 lakes from as early as 1990) has been established. Results showed that the number of sightings increased considerably in the period after 2010. Recent increases in sightings of C. sowerbii in BC and worldwide could be indicative of a climate warming-related range extension or growing public awareness and/or increased observational efforts. Even after more than 120 yr of Craspedacusta research, much about their biology and ecology remains unknown, which motivated us to compile a list of knowledge gaps based on an extensive literature survey.

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Section: Introductionmentioning

confidence: 99%

Freshwater jellyfish in northern temperate lakes: Craspedacusta sowerbii in British Columbia, Canada

2021

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“…This is a global issue, impacting marine finfish aquaculture in Europe, Asia, the Americas and Australia (Clark et al, 1997;Palma et al, 2007;Willcox et al, 2008). Cnidarian jellyfish are considered the most problematic coelenterate, even negatively impacting shellfish aquaculture (Fitridge and Keough, 2013), and freshwater fish (Bose et al, 2019). Many marine species of fish are farmed through aquaculture across the world (Table 1), and although the majority of existing research is focused on the impact of Cnidaria on Atlantic salmon and sea bass, much of our existing knowledge may be transferable to other maricultured finfish.…”

Section: Jellyfish and Aquaculturementioning

confidence: 99%

Impacts of jellyfish on marine cage aquaculture: an overview of existing knowledge and the challenges to finfish health

Clinton

Ferrier

Martín

et al. 2021

ICES Journal of Marine Science

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Gelatinous plankton present a challenge to marine fish aquaculture that remains to be addressed. Shifting plankton distributions, suggested by some to be a result of factors such as climate change and overfishing, appear to be exacerbated by anthropogenic factors linked directly to aquaculture. Fish health can be negatively influenced by exposure to the cnidarian hydrozoan and scyphozoan life stages commonly referred to as “jellyfish”. Impact is particularly pronounced in gill tissue, where three key outcomes of exposure are described; direct traumatic damage, impaired function, and initiation of secondary disease. Cnidarian jellyfish demonstrated to negatively impact fish include Cyanea capillata, Aurelia aurita, and Pelagia noctiluca. Further coelenterates have also been associated with harm to fish, including sessile polyps of species such as Ectopleura larynx. An accurate picture of inshore planktic exposure densities within the coastal environments of aquaculture would aid in understanding cnidarian species of concern, and their impact upon fish health, particularly in gill disease. This information is however presently lacking. This review summarises the available literature regarding the impact of gelatinous plankton on finfish aquaculture, with a focus on cnidarian impact on fish health. Present strategies in monitoring and mitigation are presented, alongside identified critical knowledge gaps.

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Hidden gems: Scattered knowledge hampered freshwater jellyfish research over the past one‐and‐a‐half centuries

Lüskow,

Bezio,

Caputo

et al. 2024

Ecology and Evolution

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Freshwater jellyfish (= limnic medusa‐budding hydrozoans, FWJ) are a small group of cnidarians found on all continents except Antarctica in temperate to tropical latitudes. Members of this group belong primarily to three genera: Astrohydra, Craspedacusta, and Limnocnida. While Astrohydra and Limnocnida are typically restricted to the islands of Japan, Africa, and the Indian subcontinent, one species or potential species complex, Craspedacusta sowerbii, became globally invasive. Despite research going back about one‐and‐a‐half centuries, little is known about their phylogeny and ecology compared to marine jellyfish. Recent species distribution modelling, however, showed that by 2050, C. sowerbii will potentially extend their distribution ranges due to global warming to high‐latitude ecosystems and be present (medusa stage) for an extended time in the seasonal limnic production cycle. An increase in their relative ecological importance with temporal and spatial spreading is hypothesised. Only recently, it has been shown that the trophic roles of polyps and medusae and their prey overlap with other ecosystem members. In addition, medusa behaviour may cause trophic cascades and alter vertical nutrient distributions. However, polyps and other benthic life cycle stages are understudied. In globally, changing freshwater ecosystems that may become more accommodating for FWJ, an improved understanding of their population biology and ecosystem ecology is urgently needed. In this integrative review, we, therefore, explore reasons for the hampered historical research progress, contrast developments with those of marine cnidarians, compile and publish alongside an extensive and unprecedented literature database, and formulate avenues for future directions in FWJ research.

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

Cited by 7 publications

References 43 publications

Freshwater jellyfish in northern temperate lakes: Craspedacusta sowerbii in British Columbia, Canada

Freshwater jellyfish in northern temperate lakes: Craspedacusta sowerbii in British Columbia, Canada

Impacts of jellyfish on marine cage aquaculture: an overview of existing knowledge and the challenges to finfish health

Hidden gems: Scattered knowledge hampered freshwater jellyfish research over the past one‐and‐a‐half centuries

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