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2 resultados encontrados para: AUTOR: Hoving, Hendrik Jan T.
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1.
Artículo
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Iteroparity or semelparity in the jumbo squid Dosidicus gigas: a critical choice
Laptikhovsky, Vladimir V. (autor) ; Arkhipkin, Alexander I. (autor) ; Lipiński, Marek R. (autor) ; Markaida Aburto, Unai (autor) ; Murua, Hilario (autor) ; Nigmatullin, Chingiz M. (autor) ; Sauer, Warwick H. H. (autor) ; Hoving, Hendrik Jan T. (autor) ;
Disponible en línea
Contenido en: Journal of Shellfish Research Volumen 38, número 2 (August 2019), p. 375-378 ISSN: 1943-6319
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Resumen en: Inglés |
Resumen en inglés

The jumbo squid Dosidicus gigas was recently claimed to be an iteroparous species with ovaries returning to an immature, resting stage after spawning. Analysis of the data and figures presented in two recent articles revealed that this claim was based on misinterpretation of histological information and that Dosidicus is not iteroparous. Having consensus on the reproductive strategy of Dosidicus is important for the management of fisheries for this species.


2.
- Artículo con arbitraje
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Resumen en: Inglés |
Resumen en inglés

In the eastern tropical Atlantic, the orangeback flying squid Sthenoteuthis pteropus (Steenstrup 1855) (Cephalopoda, Ommastrephidae) is a dominant species of the epipelagic nekton community. This carnivore squid has a short lifespan and is one of the fastest-grow-ing squids. In this study, we characterise the role of S. pteropus in the pelagic food web of the eastern tropical Atlantic by investigating its diet and the dynamics of its feeding habits throughout its ontogeny and migration. During three expeditions in the eastern tropical Atlantic in 2015, 129 specimens were caught by hand jigging. Stomach content analyses (via visual identification and DNA barcoding) were combined with stable isotope data (∂15N and ∂13C) of muscle tissue to describe diet, feeding habits and trophic ecology of S. pteropus. Additionally, stable isotope analyses of incremental samples along the squid’s gladius—the chitinous spiniform structure supporting the muscles and organs—were carried out to explore possible diet shifts through ontogeny and migration. Our results show that S . pteropus preys mainly on myctophid fishes (e.g. Myctophum asperum , Myctophum nitidulum, Vinciguerria spp.), but also on other teleost species, cephalopods (e.g. Enoploteuthidae, Bolitinidae, Ommastrephidae), crustaceans and possibly on gelatinous zooplankton as well.

The squid shows a highly opportunistic feeding behaviour that includes cannibalism. Our study indicates that the trophic position of S. pteropus may increase by approximately one trophic level from a mantle length of 15 cm to 47 cm. The reconstructed isotope-based feeding chronologies of the gladii revealed high intra- and inter-individual variability in the squid’s trophic position and foraging area. These findings are not revealed by diet or muscle tissue stable isotope analysis. This suggests a variable and complex life history involving individual variation and migration. The role of S. pteropus in transferring energy and nutrients from lower to higher trophic levels may be underestimated and important for understanding how a changing ocean impacts food webs in the eastern Atlantic.