North Sea Scyphomedusae; summer distribution, estimated biomass and significance particularly for 0-group Gadoid fish

Hay, Steve; Hislop, J. R. G.; Shanks, Aileen M.

doi:10.1016/0077-7579(90)90013-7

Cited by 97 publications

(86 citation statements)

References 37 publications

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“…The results are expressed as mg org. C per 100 m 3 , to make them comparable with previous estimates of medusa biomass (Hay et al, 1990). Identification of gelatinous taxa is based on Mayer (1912), Kramp (1961), Alvariño (1981), Alvariño et al (1990), Esnal (1981), Larson (1986b), Harbison (1986), Mianzan (1986a,b;1989a; and .…”

Section: Methodssupporting

confidence: 49%

Environmental patterns and biomass distribution of gelatinous macrozooplankton. Three study cases in the South-western Atlantic Ocean

Mianzán¹,

Guerrero²

2000

Sci. Mar.

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Section: Methodssupporting

confidence: 49%

Environmental patterns and biomass distribution of gelatinous macrozooplankton. Three study cases in the South-western Atlantic Ocean

Mianzán¹,

Guerrero²

2000

Sci. Mar.

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“…The mouth opening of the net was ϳ14 m 2 . When fished at a maximum speed of 2.5 knots for 1 h, about 65,000 m 3 of water was filtered, assuming 100% filtration efficiency (Hay et al 1990). During the gadoid surveys, the trawl was fished for 1 h in a standard depth profile.…”

Section: Methodsmentioning

confidence: 99%

“…1) (Hay et al 1990). Surveys, of which jellyfish were bycatch, were conducted with the International Young Gadoid Pelagic Trawl (IYGPT).…”

Section: Methodsmentioning

confidence: 99%

Interannual variability in abundance of North Sea jellyfish and links to the North Atlantic Oscillation

Lynam

Hay

Brierley

2004

Limnology & Oceanography

153

136

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Pronounced interannual variability in the abundance of medusae of the jellyfish species Aurelia aurita, Cyanea lamarckii, and Cyanea capillata (Phylum Cnidaria, Class Scyphozoa) in the North Sea was evident in data arising from the International Council for the Exploration of the Seas International 0-group Gadoid Surveys between 1971 and 1986. Possible climatic forcing of jellyfish abundance, via the North Atlantic Oscillation (NAO), was investigated with data on medusae from four areas of the North Sea (east of Scotland, north of Scotland, east of Shetland, and west of northern Denmark). There were significant inverse relationships between medusa abundance and the NAO Index (December-March) in two regions: west of northern Denmark (A. aurita r 2 ϭ 0.70, P ϭ 0.003, n ϭ 10; C. lamarckii r 2 ϭ 0.74, P ϭ 0.002, n ϭ 10) and east of Scotland (A. aurita r 2 ϭ 0.53, P ϭ 0.008, n ϭ 12). Fluctuations in the abundance of A. aurita and C. lamarckii medusae might be linked to hydroclimatic changes induced through atmospheric effects (as encapsulated in the NAO Index) on wind stress, temperature, and currents. These fundamental hydroclimatic changes alter the timing of spring phytoplankton blooms and zooplankton community composition. Predation by an abundance of medusae on zooplankton and ichthyoplankton could affect the North Sea ecosystem through top-down and bottom-up mechanisms. Because the NAO is presently in a high phase, climatic conditions could be serving to depress the abundance of medusae: a future reversal of the NAO might favor jellyfish and weaken the persistence or recovery of fisheries.

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“…However, the shape of the few lasting tentacular bulbs and the absence of excretory pores on them are as in A. forskalea Péron & Lesueur, 1810(BOUILLON 1999, the only species of the genus recorded in Brazil (MIGOTTO et al 2002). The individuals of Aurelia Péron & Lesueur, 1810 were also not determined to spe-variety of methods have been used, including large pelagic nets (HAY et al 1990, PAGÈS et al 1996, MIANZAN & GUERRERO 2000, SUCHMAN & BRODEUR 2005, individual counts in situ in scuba diving (ZAVODNIK 1987, MALEJ 1989, submersibles (e.g. VINOGRADV et al 1985, VERESHCHAKA & VINOGRADOV 1999, underwater videos (ALVAREZ COLOMBO et al 2009), surface counts (GOMEZ-AGUIRRE 1980, PITT & KINGSFORD 2003, DOYLE et al 2007, aerial photography (GRAHAM et al 2003), acoustic (ALVAREZ COLOMBO et al 2003) and demersal fishing gears (BRODEUR et al 1999, 2002, GRAHAM 2001, used opportunistically in this study to take advantage of material collected by other researchers.…”

Section: Q U a D R U M A N U Smentioning

confidence: 99%

Seasonal variation of macromedusae (Cnidaria) at North Bay, Florianópolis, southern Brazil

Júnior¹,

Nagata²,

Haddad³

2010

Zoologia (Curitiba, Impr.)

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Seasonal variation of large medusae abundance and biomass was studied in the North Bay, Santa Catarina, southern Brazil (27°30'S, 48° 32'W), from February to December 2005. Collecting was conducted seasonally with the help of fishing bottom trawl in 30-minute sections (12 in summer, 18 in each of the remaining seasons) in six stations, totaling 66 samples. Eight species were found: the hydrozoans Aequorea sp., Olindias sambaquiensis Müller, 1861, and Rhacostoma atlantica L. Agassiz, 1850; the cubozoans Chiropsalmus quadrumanus (Müller, 1859) and Tamoya haplonema Müller, 1859, and the scyphozoans Aurelia sp., Chrysaora lactea Eschscholtz, 1829 and Lychnorhiza lucerna Haeckel, 1880. Capture rates were low, up to 38 indiv. ha-1, and only ~47% of the samples were positive for jellyfish, comprising 206 individuals. Medusae abundance and species richness clearly changed from one season to another, but did not vary between the sites. Higher species richness (7 out of 8) and greater abundances were recorded during the fall (~60% and 72% of all medusae individuals and biomass respectively). Specific frequency of capture varied from 1.5 to 29% and C. lactea was the only species found in more than 25% of the samples. The three most common species dominated in different periods of the year: C. lactea during fall (78% of individuals and 60% of biomass), R. atlantica during winter (90% of individuals and 17% of biomass), and O. sambaquiensis in spring (78% of individuals and 40% of biomass). Only two individuals were caught during summer, one C. lactea and one R. atlantica. The results offer a general picture of the distribution of the macromedusae in the North Bay, but a continuous monitoring is desirable for a more detailed knowledge on the jellyfish dynamics in the Brazilian coastal waters

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North Sea Scyphomedusae; summer distribution, estimated biomass and significance particularly for 0-group Gadoid fish

Cited by 97 publications

References 37 publications

Environmental patterns and biomass distribution of gelatinous macrozooplankton. Three study cases in the South-western Atlantic Ocean

Environmental patterns and biomass distribution of gelatinous macrozooplankton. Three study cases in the South-western Atlantic Ocean

Interannual variability in abundance of North Sea jellyfish and links to the North Atlantic Oscillation

Seasonal variation of macromedusae (Cnidaria) at North Bay, Florianópolis, southern Brazil

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