The effect of lunar eclipse on the vertical migration behaviour of Meganyctiphanes norvegica (Crustacea: Euphausiacea) in the Ligurian Sea

Tarling, Geraint A.; Búchholz, Friedrich; Matthews, J. B. L.

doi:10.1093/plankt/21.8.1475

Cited by 84 publications

(81 citation statements)

References 25 publications

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“…It is interesting that when we compared pleopod beat rates between moult stages of krill from the two species, a slightly different picture emerged. Soft, newly-moulted M. norvegica had a low pleopod beat rate, suggesting that their strategy in this vulnerable condition was to sink quietly (Tarling et al, 1999). E. superba had the highest pleopod beat rates when their carapace was soft which suggests that they may be using an increased beat rate to compensate for a lower output per beat (Johnson & Tarling, 2006).…”

Section: 'Tethered' Shrimpsmentioning

confidence: 99%

“…There have been many in situ studies of swarm behaviour of M. norvegica that have revealed something of their spatial and temporal occurrence (Aitken, 1960;Nicol, 1986;Tarling et al, 1998Tarling et al, , 1999. Aspects that have been of interest to behavioural physiologists looking at the level of the individual have included the mechanisms that may promote swarm formation and maintenance and the possibility of advantages to individuals in terms of reduced costs of swimming (Wiese & Ebina, 1995;Swadling et al, 2005).…”

Section: Swarming and Swimmingmentioning

confidence: 99%

“…The ability to predict the onset of day and night enables the animals to initiate their diel migrations at the appropriate time, irrespective of the ambient light conditions. Fine tuning of the migration depth then occurs in response to changes in the light climate, for instance at times of solar (Strömberg et al, 2002) or lunar (Tarling et al, 1999) eclipses.…”

Section: Light and Daily Rhythmsmentioning

confidence: 99%

See 2 more Smart Citations

Laboratory-Based Observations of Behaviour in Northern Krill (Meganyctiphanes norvegica Sars)

Gaten

Wiese²,

Johnson

2010

Advances in Marine Biology

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Section: 'Tethered' Shrimpsmentioning

confidence: 99%

Section: Swarming and Swimmingmentioning

confidence: 99%

Section: Light and Daily Rhythmsmentioning

confidence: 99%

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Laboratory-Based Observations of Behaviour in Northern Krill (Meganyctiphanes norvegica Sars)

Gaten

Wiese²,

Johnson

2010

Advances in Marine Biology

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“…During vertical migration, krill enter the surface layers only for short periods but generally remain below a sharp thermocline at about 30 m (Tarling et al 1999a).…”

Section: Hydroclimatic Featuresmentioning

confidence: 99%

“…In a recent study of M. norvegica, behavioural investigations using sonar and multinet equipment (Tarling et al1998a(Tarling et al , 1999aGuérin-Ancey et al1998) were able to be combined with data on energy requirements. A short summary of DVM behaviour is given below as a background to considerations of energy metabolism in M. norvegica.…”

Section: The Enigma Of Dvm and Metabolic Adaptation In M Norvegicamentioning

confidence: 99%

Metabolic and enzymatic adaptations in northern krill,Meganyctiphanes norvegica, and Antarctic krill,Euphausia superba

Búchholz¹,

Saborowski²

2000

Can. J. Fish. Aquat. Sci.

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Abstract:The Antarctic krill, Euphausia superba, is restricted to the Antarctic Ocean. The northern krill, Meganyctiphanes norvegica, is extremely widely distributed from the arctic North Atlantic to the warm Mediterranean. Respiration measurements showed no seasonal differences in rates determined in krill from the thermally stable Clyde Sea (Scotland) and the cooler but variable Danish Kattegat. In the warm Ligurian Sea, where temperatures are stable, krill showed higher rates in April than in September, indicating reactions to the short but intensive productive season. Krill can passively benefit from enhancements of overall metabolism when ascending into upper, warmer water strata during their pronounced diel vertical migration. Michaelis-Menten constants (K m ) of citrate synthase (CS) were compared. In terms of respiration and enzyme regulation, krill from the Ligurian Sea stand apart: temperature and nutrition appear to be of different influence, relatable to genetic differentiation in the species. In contrast, K m of CS in E. superba is temperature independent, highlighting the species' stenothermal physiology. A basal level of activity of digestive enzymes ensures immediate utilization of patchy food sources. Specific induction, including that of chitinases, indicating omnivory in both species, underlines krill's exceptional capacity to adapt to highly variable trophic environments. Processes of moult, growth, and reproduction are locally and seasonally adjusted.Résumé : Le krill antarctique, Euphausia superba, n'habite que l'Océan antarctique, alors que le krill nordique, Meganyctiphanes norvegica, possède une répartition géographique très étendue qui va de la région arctique de l'Atlantique Nord aux eaux chaudes de la Méditerranée. Les taux respiratoires n'accusent pas de variation saisonnière chez le krill de la mer de Clyde en Écosse, un milieu à forte stabilité thermique, ni chez celui du Cattégat danois, une mer plus froide et plus changeante. Dans la mer Ligurienne, où les températures sont chaudes et stables, le krill a des taux respiratoires plus élevés en avril qu'en septembre, en réaction à la courte mais intense saison de production. Le krill peut bénéficier passivement d'un accroissement général de son métabolisme lorsqu'il se déplace vers les couches d'eau supérieures plus chaudes durant sa migration verticale quotidienne marquée. Nous avons comparé les constantes de Michaelis-Menten (K m ) de la citrate synthase (CS). En ce qui a trait à la respiration et la régulation enzymatique, le krill de la mer Ligurienne fait bande à part: la température et la nutrition semblent y avoir une influence particulière, à cause d'une différentiation génétique chez l'espèce. En revanche, la K m de la citrate synthase est indépendante de la température chez E. superba, une caractéristique physiologique d'une espèce sténotherme. Le maintien d'un niveau d'activité de base chez les enzymes digestives permet l'utilisation immédiate de ressources alimentaires à répartition contagieuse. L'induction spécifique, e...

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Aggregation and Vertical Migration

Watkins¹

2000

Krill

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The effect of lunar eclipse on the vertical migration behaviour of Meganyctiphanes norvegica (Crustacea: Euphausiacea) in the Ligurian Sea

Cited by 84 publications

References 25 publications

Laboratory-Based Observations of Behaviour in Northern Krill (Meganyctiphanes norvegica Sars)

Laboratory-Based Observations of Behaviour in Northern Krill (Meganyctiphanes norvegica Sars)

Metabolic and enzymatic adaptations in northern krill,Meganyctiphanes norvegica, and Antarctic krill,Euphausia superba

Aggregation and Vertical Migration

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