Periodicity in the accumulation of gelatinous zooplankton during the summer season in the coastal area of Iyo‐Nada, Japan

Kaneda, Atsushi; Kohama, Takeshi; Kawamura, Yuji; Takeoka, Hidetaka

doi:10.4319/lo.2007.52.2.0707

Cited by 14 publications

(5 citation statements)

References 15 publications

(18 reference statements)

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“…Similar problems have been reported from other countries. Jellyfish clogging requires ongoing maintenance; one power plant in Japan has maintained records of the jellyfish biomass cleaned daily from the intake screens, providing a decade-long record of jellyfish abundance (Kaneda et al 2007). Clogging incidents can cause emergency situations at nuclear power plants (NPPs) and can result in significant power loss and economic damage to affected cities.…”

Section: Human Problems Resulting From Jellyfish Bloomsmentioning

confidence: 99%

Anthropogenic causes of jellyfish blooms and their direct consequences for humans: a review

Purcell

Uye²,

Lo³

2007

Mar. Ecol. Prog. Ser.

878

694

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Although recent articles state that jellyfish populations are increasing, most available evidence shows that jellyfish abundances fluctuate with climatic cycles. Reports of increasing problems with jellyfish, especially in East Asia, are too recent to exclude decadal climate cycles. Jellyfish are infamous for their direct negative effects on human enterprise; specifically, they interfere with tourism by stinging swimmers, fishing by clogging nets, aquaculture by killing fish in net-pens and power plants by clogging cooling-water intake screens. They also have indirect effects on fisheries by feeding on zooplankton and ichthyoplankton, and, therefore, are predators and potential competitors of fish. Ironically, many human activities may contribute to increases in jellyfish populations in coastal waters. Increased jellyfish and ctenophore populations often are associated with warming caused by climate changes and possibly power plant thermal effluents. Jellyfish may benefit from eutrophication, which can increase small-zooplankton abundance, turbidity and hypoxia, all conditions that may favor jellyfish over fish. Fishing activities can remove predators of jellyfish and zooplanktivorous fish competitors as well as cause large-scale ecosystem changes that improve conditions for jellyfish. Aquaculture releases millions of jellyfish into Asian coastal waters yearly to enhance the jellyfish fishery. Aquaculture and other marine structures provide favorable habitat for the benthic stages of jellyfish. Changes in the hydrological regime due to dams and other construction can change the salinity to favor jellyfish. Accidental introductions of non-native gelatinous species into disturbed ecosystems have led to blooms with serious consequences. In many coastal areas, most of these environmental changes occur simultaneously. We summarize cases of problem jellyfish blooms and the evidence for anthropogenic habitat disruptions that may have caused them. Rapid development in East Asia makes that region especially vulnerable to escalating problems. We conclude that human effects on coastal environments are certain to increase, and jellyfish blooms may increase as a consequence.

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Section: Human Problems Resulting From Jellyfish Bloomsmentioning

confidence: 99%

Anthropogenic causes of jellyfish blooms and their direct consequences for humans: a review

Purcell

Uye²,

Lo³

2007

Mar. Ecol. Prog. Ser.

878

694

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“…Our results did not show any significant correlation between the abundance of gelatinous carnivores and seasonal inshore or offshore water mass transport. However, it cannot be excluded that over shorter time scales the effect of water transport can be noticeable, as has been shown in sudden seasonal massive increases of gelatinous carnivores in nearshore areas of Japanese waters (Kaneda et al 2007). In contrast, the recurrent higher abundances of these organisms observed in the 1980s were instead closely linked to modifications in the hydrographic regime (e.g., warm temperature, enhancement of the stratification).…”

Section: Predictormentioning

confidence: 96%

The influence of the Atlantic and regional climate variability on the long‐term changes in gelatinous carnivore populations in the northwestern Mediterranean

Molinero

Casini

Buecher

2008

Limnology & Oceanography

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We investigated potential connections between climate and the population size of gelatinous carnivores in the northwestern Mediterranean. The interannual variability of large-and meso-scale climate factors was related to gelatinous carnivore dynamics by means of a multivariate regression model. Gelatinous carnivore population dynamics integrate the climate-related changes in the northwestern Mediterranean with close correlations between climate and the population size of the Calycophoran siphonophores Chelophyes appendiculata and Abylopsis tetragona and the Hydromedusae Rhopalonema velatum and Solmundella bitentaculata. We show that the sensitivity of particular gelatinous carnivore species to environmental forcing relates to their seasonal appearance and peak of abundance. Our results advocate the occurrence of short time windows, during which gelatinous carnivores appear more sensitive to environmental conditions, and favorable conditions may therefore substantially enhance their annual peaks. Furthermore, there were threshold values from which climate effects on gelatinous carnivores become noticeable, indicating that the climate-gelatinous carnivore relationship intensifies according to the strength of climate forcing. The possibility of using the North Atlantic climate variability for assessing and predicting interannual abundance changes of these organisms in the northwestern Mediterranean is considered.

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“…Local weather conditions, such as wind direction, play an essential role in accumulations of jellyfish assemblages in coastal waters. Onshore wind bursts also trigger localized jellyfish aggregations (Kaneda et al 2007). Oceanic physical processes such as tidal fronts (Brodeur et al 1997), convergent flow (Graham et al 2001), and small linear surface convergences during Langmuir circulation also lead to jellyfish accumulations (Graham et al 2001).…”

Section: Environmental Variables For Jellyfish Swarmingmentioning

confidence: 99%

A review of jellyfish aggregations, focusing on India’s coastal waters

et al. 2020

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A review of jellyfish aggregations focused on India’s coastal waters was conducted, with the aim to enhance understanding of conducive conditions and subsequent ecological impacts. Jellyfish swarming, as well as their beach strandings, have been reported from many areas of the world—including India’s coastal waters. A variety of natural (winds, tidal fronts, surface currents, water temperature, salinity, turbidity, dissolved oxygen) and anthropogenic (water quality deterioration, overfishing, translocation, habitat modification) factors play pivotal roles in triggering jellyfish aggregations. Jellyfish aggregation events in the forms of their swarming in coastal waters and beach strandings have resulted in ephemeral nuisances such as water quality deterioration, food chain alterations, hindrance in seawater uptake by power plants, clogging of nets during fishing operations, and tourism declines. Several well-known Indian tourist beaches (e.g., Puri, Chennai, Goa, and Mumbai) have experienced beach strandings. Despite recurrence of such events, jellyfishes are relatively less scientifically investigated and monitored in Indian coastal waters. Therefore, it is important to determine the environmental conditions that trigger jellyfish swarming, in order to develop effective monitoring and prediction strategies. This study additionally proposes a conceptual framework towards development of a jellyfish monitoring system for Indian waters using satellite and model data.

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Periodicity in the accumulation of gelatinous zooplankton during the summer season in the coastal area of Iyo‐Nada, Japan

Cited by 14 publications

References 15 publications

Anthropogenic causes of jellyfish blooms and their direct consequences for humans: a review

Anthropogenic causes of jellyfish blooms and their direct consequences for humans: a review

The influence of the Atlantic and regional climate variability on the long‐term changes in gelatinous carnivore populations in the northwestern Mediterranean

A review of jellyfish aggregations, focusing on India’s coastal waters

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