Citation:

cjz-2017-0353

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Abstract:

Light regime is an important Zeitgeber for Antarctic krill (Euphausia superba), which seems to entrain an endogenous timing system that synchronizes its life cycle to the extreme light conditions in the Southern Ocean. To understand the flexibility of Antarctic krill's seasonal cycle, we investigated its physiological and behavioural response to different light regimes and if an endogenous timing system was involved in the regulation of these seasonal processes. We analysed growth, feeding, lipid content and maturity in a two-year lab experiment simulating the latitudinal light regimes 52°S, 66°S and constant darkness under constant food level. Our results showed that light regime affected seasonal cycles of growth, lipid metabolism and maturity in Antarctic krill. Seasonal patterns of growth and maturity persisted under constant darkness indicating the presence of an endogenous timing system. The maturity cycle showed differences in development and critical photoperiods according to the simulated light regime. This suggests a flexible endogenous timing mechanism in Antarctic krill, which may determine its response to future environmental changes.

Further details:

Brown, Matthew; Kawaguchi, So; Candy, Steven; Virtue, Patti (2010): Temperature effects on the growth and maturation of Antarctic krill (Euphausia superba). Deep Sea Research Part II: Topical Studies in Oceanography, 57(7-8), 672-682, https://doi.org/10.1016/j.dsr2.2009.10.016

Brown, Matthew; Kawaguchi, So; King, Rob; Virtue, Patti; Nicol, Steven (2011): Flexible adaptation of the seasonal krill maturity cycle in the laboratory. Journal of Plankton Research, 33(5), 821-826, https://doi.org/10.1093/plankt/fbq123

Makarov, R R; Denys, C J (1980): Stages of sexual maturity of Euphausia superba Dana. BIOMASS Handbook, 11, 1-13

Thomas, P G; Ikeda, T (1987): Sexual regression, shrinkage, re-maturation and growth of spent female Euphausia superba in the laboratory. Marine Biology, 95(3), 357-363, https://doi.org/10.1007/BF00409565

Coverage:

Date/Time Start: 2015-02-01T00:00:00 * Date/Time End: 2016-12-01T00:00:00

Comment:

The maturity stage of the sampled krill was assessed according to Makarov and Denys (1980) and Thomas and Ikeda (1987) analysing the pictures of the external sexual organs. A maturity score was assigned using the method by Brown et al. (2010, 2011).

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Sample code/label	Sample label		Höring, Flavia
2	Treatment	Treat		Höring, Flavia		light regime
3	Method comment	Method comm		Höring, Flavia		experimental tank
4	Photoperiod, hours of daylight	Photoperiod	h	Höring, Flavia
5	Experiment duration	Exp duration	months	Höring, Flavia
6	DATE/TIME	Date/Time		Höring, Flavia		Geocode
7	Sex	Sex		Höring, Flavia
8	Carapax length	CL	mm	Höring, Flavia
9	Digestive gland length	DGL	mm	Höring, Flavia
10	Euphausia superba, relative digestive gland length to carapax length	E superba DGL/CL	%	Höring, Flavia
11	Euphausia superba, maturity score	E. superba mat score		Höring, Flavia	Maturity score after Brown et al. (2010, 2011)
12	Comment	Comment		Höring, Flavia		full maturity: 1 = yes, 0 = no
13	Carapax, dry mass	Carapax dm	g	Höring, Flavia
14	Lipids	Lipids	µg	Höring, Flavia		content of carapax
15	Lipids	Lipids	%	Höring, Flavia		content of carapax

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

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7037 data points

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