scholarly journals Enhancement of jellyfish (Aurelia aurita) populations by extensive aquaculture rafts in a coastal lagoon in Taiwan

2008 ◽  
Vol 65 (3) ◽  
pp. 453-461 ◽  
Author(s):  
Wen-Tseng Lo ◽  
Jennifer E. Purcell ◽  
Jia-Jang Hung ◽  
Huei-Meei Su ◽  
Pei-Kai Hsu
Keyword(s):  
Coastal Lagoon ◽  
Coastal Waters ◽  
Natural Experiment ◽  
Water Exchange ◽  
Larval Settlement ◽  
Aurelia Aurita ◽  
Trophic Conditions ◽  
Moon Jellyfish ◽  
Southwestern Taiwan ◽  
Human Construction

Abstract Lo, W-T., Purcell, J. E., Hung, J-J., Su, H-M., and Hsu, P-K. 2008. Enhancement of jellyfish (Aurelia aurita) populations by extensive aquaculture rafts in a coastal lagoon in Taiwan. – ICES Journal of Marine Science, 65: 453–461. Blooms of the moon jellyfish, Aurelia aurita, often occur in coastal waters that are heavily affected by human construction, such as harbours. Tapong Bay is a hypertrophic lagoon in southwestern Taiwan that was studied between August 1999 and September 2004. The removal of extensive oyster-culture rafts in June 2002 provided a “natural” experiment to examine the effects of aquaculture on processes and communities in the lagoon. The removal caused many changes in the ecosystem, including increases in flushing, light penetration, dissolved oxygen, salinity, chlorophyll a, primary production, and zooplankton, but decreases in nutrients, periphyton, and dramatically reduced populations of bivalves, zooplanktivorous fish, and jellyfish (A. aurita). We conclude that environmental and trophic conditions were favourable for jellyfish throughout the study period. Therefore, we believe that aquaculture rafts enhanced jellyfish populations by three probable mechanisms: the rafts provided substrate and shading for the larval settlement and polyp colony formation, and the rafts restricted water exchange in the lagoon. Aquaculture is increasing rapidly in Asia, and the problems associated with jellyfish may also increase.

Density-driven water exchange controls seasonal declines in jellyfish (Aurelia aurita) abundance in a shallow fjord system

2018 ◽  
Vol 597 ◽  
pp. 137-145 ◽  
Author(s):  
J Goldstein ◽  
C Jürgensen ◽  
UK Steiner ◽  
HU Riisgård
Keyword(s):  
Water Exchange ◽  
Aurelia Aurita ◽  
Fjord System

scholarly journals Shorter, warmer winters may inhibit production of ephyrae in a population of the moon jellyfish Aurelia aurita

Hydrobiologia ◽  
2020 ◽  
Author(s):  
Alexandra Loveridge ◽  
Cathy H. Lucas ◽  
Kylie A. Pitt
Keyword(s):  
Incubation Time ◽  
Life Stage ◽  
Aurelia Aurita ◽  
The Moon ◽  
Minimum Period ◽  
Moon Jellyfish ◽  
Winter Conditions ◽  
Scyphozoan Jellyfish ◽  
Significant Production ◽  
Planula Larvae

AbstractScyphozoan jellyfish blooms display high interannual variability in terms of timing of appearance and size of the bloom. To understand the causes of this variability, the conditions experienced by the polyps prior to the production of ephyrae in the spring were examined. Polyps reared from planula larvae of Aurelia aurita medusae collected from southern England (50°49′58.8; − 1°05′36.9) were incubated under orthogonal combinations of temperature (4, 7, 10 °C) and duration (2, 4, 6, 8 weeks), representing the range of winter conditions in that region, before experiencing an increase to 13 °C. Timing and success of strobilation were recorded. No significant production of ephyrae was observed in any of the 2- and 4-week incubations, or in any 10 °C incubation. Time to first ephyra release decreased with longer winter incubations, and more ephyrae were produced following longer and colder winter simulations. This experiment indicates that A. aurita requires a minimum period of cooler temperatures to strobilate, and contradicts claims that jellyfish populations will be more prevalent in warming oceans, specifically in the context of warmer winter conditions. Such investigations on population-specific ontogeny highlights the need to examine each life stage separately as well as in the context of its environment.

Thalassiosira baltica (Grunow) Ostenfeld (Bacillariophyta), a new exotic species in the Great Lakes

2000 ◽  
Vol 57 (3) ◽  
pp. 610-615 ◽  
Author(s):  
M B Edlund ◽  
C M Taylor ◽  
C L Schelske ◽  
E F Stoermer
Keyword(s):  
Great Lakes ◽  
Exotic Species ◽  
Coastal Waters ◽  
Water Exchange ◽  
Sediment Cores ◽  
Laurentian Great Lakes ◽  
Northern Europe ◽  
Brackish Waters ◽  
Predominant Component ◽  
Successful Establishment

Microfossil analysis of sediment cores collected in 1994 and phytoplankton collected in 1998 from Lake Ontario indicated that the diatom Thalassiosira baltica (Grunow) Ostenfeld was introduced and became established ca. 1988 according to 210Pb date estimates and has remained a predominant component of the phytoplankton since its establishment. Thalassiosira baltica is an exotic species in the Laurentian Great Lakes and is more commonly found in coastal brackish waters in western and northern Europe and only rarely reported from North American coastal waters. The probable vector for introduction of T. baltica was ballast water exchange and the successful establishment attributed to this taxon's euryhalinity tolerance.

Significant envenomation by Aurelia aurita, the moon jellyfish

Toxicon ◽  
1988 ◽  
Vol 26 (2) ◽  
pp. 215-217 ◽  
Author(s):  
Joseph W. Burnett ◽  
Gary J. Calton ◽  
James B. Larsen
Keyword(s):  
Aurelia Aurita ◽  
The Moon ◽  
Moon Jellyfish

scholarly journals Dynamics of currents in a Small-scale Coastal Lagoon,Southwestern Taiwan

1999 ◽  
Vol 10 (4) ◽  
pp. 885 ◽  
Author(s):  
Sen Jan ◽  
Hwung-Hweng Hwung ◽  
Shenn-Yu Chao ◽  
Jin-Li Yu
Keyword(s):  
Coastal Lagoon ◽  
Small Scale ◽  
Southwestern Taiwan

scholarly journals Spatial and Temporal Variation of Scleractinian Coral Recruitment in Balok Coastal Waters and Bidong Island, Malaysia

2021 ◽  
Vol 6 (1) ◽  
pp. 1-14
Author(s):  
Fikri Akmal Khodzori ◽  
Shahbudin Saad ◽  
Husaini Rani
Keyword(s):  
Coral Reef ◽  
Temporal Variation ◽  
Environmental Conditions ◽  
Coastal Waters ◽  
Scleractinian Coral ◽  
Larval Settlement ◽  
Artificial Reef ◽  
Spatial And Temporal Variation ◽  
Coral Recruitment ◽  
Recruitment Patterns

Understanding coral recruitment is important as increasing of regional decline of coral reef worldwide. This study aimed to investigate the spatial and temporal coral recruitment patterns around reef sites in Balok coastal waters and Bidong Island, Malaysia. Recruitment density was determined by quantifying number of coral recruits settled on the terra-cotta tiles and artificial reef settlement plates. In Balok coastal waters, a total of 159 coral recruits were counted with 0.09 ± 0.03 n/m2 mean recruitment density per plate, while in Bidong Island, a total of 319 coral recruits were counted with 0.19 ± 0.02 n/m2 mean recruitment density per plate. Coral recruits were dominated by genus Pocillopora followed by Stylopora and Seriatopora in Bidong. Meanwhile in Balok, genus Platygyra was dominant coral recruits followed by Porites and Fungia. Additionally, minor spawning event was predicted in Balok coastal waters in September due to increase number of Platygyra coral. Recruitment density varied significantly between locations, types of settlement plates and plate’s orientation at both study areas. Current findings highlighted the significant use of artificial reef plates to increase the chances of larval settlement. This research also provides important information in assessing coral resilience towards different environmental conditions between coastal and sheltered reef areas.

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