On the biology of the Antarctic krillEuphausia superba

Ivanov, B.G.

doi:10.1007/bf00750827

Cited by 42 publications

(9 citation statements)

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“…Marr (1962) maintained that swarms of Euphausia superba remained age segregated from the moment of hatching and provided many examples to support this theory. Subsequent evidence has tended to corroborate Marr's ideas for this species (Burrokovskiy, 1965;Ivanov, 1970;Makarov, 1970Makarov, , 1979Jazdzewski et al, 1978). There is some evidence that other species of euphausiids may show some form of spatial segregation as well.…”

Section: Discussionmentioning

confidence: 90%

Population structure of daytime surface swarms of the euphausiid Meganyctiphanes norvegica in the Bay of Fundy

Nicol¹

1984

Mar. Ecol. Prog. Ser.

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Daytime surface swarms of the euphausiid Meganyctiphanes norvegica occurring off Brier and Long Islands in the Bay of Fundy were studied during the summers of 1979 to 1983. Individual swarms were found to have highly skewed sex ratios; both male dominated and female dominated swarms were encountered but female swarms were more common. Individuals in surface swarms comprised a restricted part of the population when compared to samples taken at depth and when compared to the population structure of this species at similar times of year in other studies. Both males and females were in breeding condition; males possessed ripe spermatophores, females were fertilized and exhibited ovaries in an advanced stage of maturation. The presence of swarms was accompanied by bursts of M. norvegica eggs in the plankton on spatial and temporal scales coincident with the swarming events. It is concluded that these swarms are related to reproductive activity.

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Section: Discussionmentioning

confidence: 90%

Population structure of daytime surface swarms of the euphausiid Meganyctiphanes norvegica in the Bay of Fundy

Nicol¹

1984

Mar. Ecol. Prog. Ser.

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“…Several studies conducted in different regions of the Southern Ocean have concluded that Antarctic krill live for at least 4 to 6 yr (Ivanov 1970, Aseev 1983, Siege1 1986, Hosie et al 1988, and may even live as long as 7 to 8 yr (Ettershank 1984, Ikeda 1985, Rosenberg et al 1986). In the Cosmonaut Sea and in the southern part of the Cooperation Sea, only 5 age groups (including larvae) were clearly identified, while in the northern oceanic area of the Cooperation Sea 6 age classes were found.…”

Section: Discussionmentioning

confidence: 99%

“…Juveniles of E. superba are regarded as a single age group ( l + ) with a normal distribution (Ettershank 1985, Siegel 1987, Hosie & Stolp 1989. Subsequently, after much research (Ivanov 1970, Aseev 1983, Ettershank 1984, Siegel 1987, it was concluded that the size distributions of older krill follow the same pattern and are also normally distributed. Therefore, the modal peaks identified by the Macdonald & Pitcher method should represent year classes (called age groups).…”

Section: Methodsmentioning

confidence: 99%

Demographic studies of Antarctic krill Euphausia superba in the Cooperation and Cosmonaut Seas (Indian sector of the Southern Ocean)

Pakhomov¹

1995

Mar. Ecol. Prog. Ser.

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“…The traditional method of estimating the age of Antarctic krill is to measure the size of the krill, and to recognize peaks in the resultant length-frequency distributions as year classes (Marr 1962, Ivanov 1970, Mackintosh 1972, Siege1 1987, Hosie et al 1988, Pakhomov 1995. These studies have relied upon there being a predictable relationship between the length of krill and their age.…”

Section: Introductionmentioning

confidence: 99%

The compound eye as an indicator of age and shrinkage in Antarctic krill

1995

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Laboratory studies have shown that Antarctic krill (Euphausia superba) shrink if maintained in conditions of low food availability. Recent studies have also demonstrated that E. superba individuals may be shrinking in the field during winter. If krill shrink during the winter, conclusions reached by length-frequency analysis may be unreliable because smaller animals may not necessarily be younger animals. In this study, the correlation between the body-length and the crystalline cone number of the compound eye was examined. Samples collected in the late summer show an apparent linear relationship between crystalline cone number and body-length. From a laboratory population, it appears that when krill shrink the crystalline cone number remains relatively unchanged. If crystalline cone number is little affected by shrinking, then the crystalline cone number may be a more reliable indicator of age than body-length alone. The ratio of crystalline cone number to body-length offers a method for detecting the effect of shrinking in natural populations of krill. On the basis of the crystalline cone number count, it appears from a field collection in early spring that E. superba do shrink during winter.

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On the biology of the Antarctic krillEuphausia superba

Cited by 42 publications

References 0 publications

Population structure of daytime surface swarms of the euphausiid Meganyctiphanes norvegica in the Bay of Fundy

Population structure of daytime surface swarms of the euphausiid Meganyctiphanes norvegica in the Bay of Fundy

Demographic studies of Antarctic krill Euphausia superba in the Cooperation and Cosmonaut Seas (Indian sector of the Southern Ocean)

The compound eye as an indicator of age and shrinkage in Antarctic krill

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