Scyphozoan jellyfish blooms and their relationship with environmental factors along the South-eastern Arabian Sea

Riyas, Abdul; Dahanukar, Neelesh; Krishnan, K. Anoop; Kumar, Appukuttannair Biju

doi:10.1080/17451000.2021.1916034

Cited by 7 publications

(7 citation statements)

References 67 publications

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“…In this study, the results of correlation analyses revealed a significant negative correlation between the DO level and the RB of N. nomurai, which was consistent with the findings of previous studies (Riyas et al, 2021). The DO level decreased sharply from May to early August, which corresponded with the rapid growth and increased RB, and coincided with a rapid increase in the daily interception and capture of jellyfish.…”

Section: Relationship Between Large Jellyfish Blooms and Environmenta...supporting

confidence: 92%

“…First, the analysis of environmental factors is an effective strategy for predicting jellyfish blooms (Baumsteiger et al, 2018;Dong et al, 2018;Riyas et al, 2021). Further analyses of metagenic life cycles and real-time online monitoring of environmental indicators would aid in predicting and designing effective measures against the aggregation of different jellyfish species for ensuring the operational safety of NPCSs.…”

Section: Recommendations For the Intake Safetymentioning

confidence: 99%

“…Blooms caused by jellyfish, especially those of the class Scyphozoa, which have metagenic life cycles, have become a common phenomenon in recent years owing to various environmental pressures, including global climate change and anthropogenic activities (Purcell et al, 2007;Richardson et al, 2009;Purcell, 2012;Dawson et al, 2015;Quinones et al, 2018;Goldstein and Steiner, 2020;Rekstad et al, 2021;Riyas et al, 2021). The sudden or aberrant increase in jellyfish biomass has caused jellyfish disasters in several parts of the globe's oceans, affecting fisheries, and damaging the safety of nuclear power cooling-water systems (NPCSs), especially in Europe, Asia, and North America (Lucas and Dawson, 2014;Schiariti et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

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Aggregation process of two disaster-causing jellyfish species, Nemopilema nomurai and Aurelia coerulea, at the intake area of a nuclear power cooling-water system in Eastern Liaodong Bay, China

Wang

Jin²,

Yang³

et al. 2023

Front. Mar. Sci.

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The intake safety of nuclear power cooling-water systems (NPCSs) is an important aspect of operational safety of nuclear power plants (NPPs). The blockages caused by aberrant outbreaks of various aquatic organisms have seriously affected operational safety. Large jellyfish constitute the main groups of marine organisms responsible for these blockages. The processes of aggregation and the relationships of two major disaster-causing scyphozoan jellyfish species, Nemopilema nomurai and Aurelia coerulea, with four environmental factors at the intake area of an NPCS in Eastern Liaodong Bay, China, were investigated in 2019 and 2020. The findings revealed that A. coerulea ephyrae were present in the surrounding ports in mid-May; however, N. nomurai ephyrae were absent during the survey period in this study, and the medusae of N. nomurai started appearing from late May. The individual growth and relative biomass (RB) of the jellyfish increased rapidly from late June to July and decreased rapidly thereafter, in September. The RB of N. nomurai was highly correlated to the sea surface temperature (SST) and levels of dissolved oxygen (DO) in the region. The RB increased with increasing SST and decreased at increasing DO levels. The RB of A. coerulea was significantly negatively correlated with that of N. nomurai, and the peak biomass of the two species alternated over time, which could be attributed to the fact that the jellyfish species share similar ecological niches. The bell diameters were significantly positively correlated with the individual wet weights, and the value of one could be inferred from the value of the other. Although the processes of jellyfish aggregation are attributed to several factors, including interactions with environmental factors and human activities, such as fishing, the results obtained in this study would serve as an important reference and provide a basis for the prevention of jellyfish blooms in waters adjacent to NPPs. The prevention and control of jellyfish disasters at the intake area of NPCSs are not only local concerns. Therefore, remediation from the source combined with the maximum utilization of social resources for monitoring and early warning would immensely improve the efficacy of such preventive strategies.

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Section: Relationship Between Large Jellyfish Blooms and Environmenta...supporting

confidence: 92%

Section: Recommendations For the Intake Safetymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Aggregation process of two disaster-causing jellyfish species, Nemopilema nomurai and Aurelia coerulea, at the intake area of a nuclear power cooling-water system in Eastern Liaodong Bay, China

Wang

Jin²,

Yang³

et al. 2023

Front. Mar. Sci.

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“…In terms of the co-occurrence, it happened at the end of the 2019-2020 NEM which was characterized by rising SSTs (Fig 3a) after a period of positively anomalous temperatures (Fig 3b) and chlorophyll-a concentration higher than the average level (Fig 3c, blue line). The seasonal behavior of chlorophyll-a levels during NEM is a vital datum in analyzing future blooms since these are prospective proxies for phytoplankton biomass (Kramer 2014) and are also suggestively shown to have a positive correlation with jellyfish abundance (Riyas et al 2021). Considering the frequency trend of MHWs in more recent years, future co-occurrences are possible if appropriate conditions are met for jellyfish to bloom during times when ocean-atmospheric interaction could yield extremely warm events.…”

Section: Trends Of Ssts Chlorophyll-a and Mhws In The Wpsmentioning

confidence: 99%

“…Blooms can clog and damage fish nets, reduce both the quality and quantity of fish catch, and compete or even dominate an ecosystem (Doyle et al 2008, Bosch-Belmar et al 2020. They can also inhibit fish catching near the coast which forces fish catchers to fish further offshore or even stop fishing until the bloom ends (Riyas et al 2021) which affects their income and livelihood. Regarding nutrient cycling, jellyfish excrete and take up dissolved organic matters (Purcell et al 2007).…”

Section: Ecological and Socio-economic Implications Of The Findingsmentioning

confidence: 99%

Co-occurrence of a marine heatwave and a reported tomato jellyfish (<i>Crambione mastigophora</i> Maas, 1903) bloom in March 2020 at El Nido, Palawan, Philippines

Quilestino-Olario

Concolis

Atup

et al. 2023

Plankton Benthos Res

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Globally, observations on marine species during marine heatwaves (MHWs) help outline the scope of the MHWʼs possible biological effects. In line with this effort, this paper presents a 2020 MHW that coincided with a reported ʻtomato jellyfishʼ (Crambione mastigophora Maas, 1903) bloom on 23 March 2020 in the Corong-Corong Bay of Palawan, Philippines. Detecting a moderate MHW from 21 March to 04 April 2020, the analysis of sea surface temperatures revealed that most areas surrounding the bloom site attained their peak positive anomalies on the same day as the reported bloom. Certain physical mechanisms present in the first quarter of 2020 may have played a role in the occurrence of both events: the presence of cyclonic eddies and parallel monsoonal winds alongshore can induce upwelling which promotes biological productivity in surface waters, while the observed weakening of winds have been associated with anomalous warming of the sea surface. Further studies are still highly recommended to determine the exact causes of the jellyfish bloom and what conditions make it more likely to happen during MHWs. However, if the C. mastigophora is hypothetically able to continually bloom amidst warming temperatures, the increasing trend of MHW frequency and intensity in the West Philippine Sea (where the reported bloom site is situated) may consequently yield more future co-occurrences. This paper aims to hopefully contribute to the existing knowledge of possible biological impacts associated with extreme marine events, especially in the Philippine context where both jellyfish blooms and MHWs are understudied.

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Morphological and molecular characterisation of ghost jellyfish Cyanea nozakii (Cnidaria: Scyphozoa) forming a swarm in the Bay of Bengal, Indian Ocean

Siddique,

Basu,

Prasad

et al. 2023

Regional Studies in Marine Science

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Scyphozoan jellyfish blooms and their relationship with environmental factors along the South-eastern Arabian Sea

Cited by 7 publications

References 67 publications

Aggregation process of two disaster-causing jellyfish species, Nemopilema nomurai and Aurelia coerulea, at the intake area of a nuclear power cooling-water system in Eastern Liaodong Bay, China

Aggregation process of two disaster-causing jellyfish species, Nemopilema nomurai and Aurelia coerulea, at the intake area of a nuclear power cooling-water system in Eastern Liaodong Bay, China

Co-occurrence of a marine heatwave and a reported tomato jellyfish (<i>Crambione mastigophora</i> Maas, 1903) bloom in March 2020 at El Nido, Palawan, Philippines

Morphological and molecular characterisation of ghost jellyfish Cyanea nozakii (Cnidaria: Scyphozoa) forming a swarm in the Bay of Bengal, Indian Ocean

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