ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

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Changes in the cephalopod diet of southern elephant seal females at King George Island, during El Niño - La Niña events (2002)

Piatkowski, Uwe ; Vergani, Daniel F. ; Stanganelli, Zulma B.

Cambridge University Press

In: Journal of The Marine Biological Association of The United Kingdom, 82 . pp. 913-916.

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Publikationsdatum: 2021-07-05

Beschreibung: Possible effects of ‘El Niño’ Southern Oscillation (ENSO) components ‘El Niño’ and ‘La Niña’ on populations of southern elephant seals, Mirounga leonina, were analysed. Changes in the cephalopod diet composition of moulting females at King George Island, Antarctic Peninsula were considered. The diet of female elephant seals sampled in 1991–1992 and 1992–1993 (El Niño years) were compared with those taken in 1995–1996 (La Niña year) at the same site and employing the same methodology. The squid Psychroteuthis glacialis constituted the main cephalopod prey of the seals. A reduction in the ‘Index of Biomass Ingested’ by female elephant seals (IBIF) of this prey species was observed in ‘El Niño’ years (1992, 1993) compared with the ‘La Niña’ year (1996). This reduction in biomass applied to all squid species in the seals' prey with the exception of Galiteuthis glacialis, which occurred in low numbers, but was more abundant during El Niño years than in the La Niña year.

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Lipid and fatty acid composition of the mantle and digestive gland of four Southern Ocean squid species: implications for food-web studies (2002)

Phillips, Katrina L. ; Nichols, Peter D. ; Jackson, George D.

Cambridge University Press

In: Antarctic Science, 14 (3). pp. 212-220.

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Publikationsdatum: 2021-07-13

Beschreibung: Lipid content, lipid class and fatty acid composition of four Southern Ocean cephalopod species – the myopsid Sepioteuthis australis and three oegopsids, Gonatus antarcticus , Moroteuthis robsoni and Todarodes spp. – were analysed. The lipid content of the digestive gland was consistently greater than that of the mantle, and was an order of magnitude greater in oegopsid species. The lipid class and fatty acid composition of the mantle and digestive gland also differed markedly in each species. Digestive gland lipid is likely to be of dietary origin, and large amounts of lipid in the digestive gland of oegopsids may accumulate over time. Thus the digestive gland is a rich source of fatty acid dietary tracers and may provide a history of dietary intake. However, the absolute amount of dietary lipid in the digestive gland of oegopsid species exceeds the absolute lipid content of mantle tissue. Therefore the overall lipid “signature” of an oegopsid may more closely resemble its prey species rather than its mantle tissue. When lipid techniques are used in dietary analysis of teuthophagous predators, squid may not be represented by a unique signature in analyses and their importance in the diets of predators may be underestimated.

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Pleistocene to Recent tectonics in the Rhenish Massif (Germany) (2002)

Meyer, W. ; Stets, J.

Cambridge University Press

In: Netherlands Journal of Geosciences - Geologie en Mijnbouw, 81 (2). pp. 217-221.

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Publikationsdatum: 2021-01-07

Beschreibung: Uplift of the Rhenish Massif can be demonstrated by means of the stream-made river terrace system that accompanies the Rhine river and its tributaries along their way through or within this part of the Variscan fold and thrust belt. The height difference between a former valley floor, especially that of the Younger ‘Hauptterrasse’ (Main Terrace), and the recent one allows to quantify the uplift by the amount of downcutting erosion. The uplift velocity increased just after the BRUNHES / MATUYAMA boundary, i.e. about 0.8 Ma B.R Since that time, a domal uplift of more than 250 m is documented in the eastern Hunsriick and in the south-eastern Eifel. The area of this maximum height anomaly is situated just between the East-and West-Eifel Quaternary volcanic districts. Thus, causal connections are supposed. The domai uplift is affected by normal faulting partly inherited since Tertiary rifting.

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Systematic position and reproduction of squid of the genus Alloteuthis (Cephalopoda: Loliginidae) in the eastern Mediterranean (2002)

Laptikhovsky, Vladimir ; Salman, Alp ; Önsoy, Bahadir ; [weitere]

Cambridge University Press

In: Journal of the Marine Biological Association of the United Kingdom, 82 (6). pp. 983-985.

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Publikationsdatum: 2021-07-08

Beschreibung: Squid of the genus Alloteuthis from the Aegean Sea and eastern Mediterranean were identified as A. media. It is not possible to distinguish A. media from A. subulata by relative fin length. Both ‘species’ are probably intraspecific forms. Egg size varied from 1·5 to 2·3 mm. Oocyte maturation in the ovary occurs in batches. The potential fecundity is some 1000–4000 eggs, most of these being released during continuous spawning accompanied by female growth.

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