KFU. Card publication. Reproductive biology and ecology of the boreoatlantic armhook squid Gona-tus fabricii (Cephalopoda: Gonatidae)

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REPRODUCTIVE BIOLOGY AND ECOLOGY OF THE BOREOATLANTIC ARMHOOK SQUID GONA-TUS FABRICII (CEPHALOPODA: GONATIDAE)

Form of presentation

Articles in international journals and collections

Year of publication

2019

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Authors, employees of KFU

Golikov Aleksey Valentinovich, author

Sabirov Rushan Mirzovich, author

Bibliographic description in the original language

Golikov A.V., Blicher M. E., Jørgensen L.L., Walkusz W., Zakharov D.V., Zimina O.L. and Sabirov R.M. Reproductive biology and ecology of the boreoatlantic armhook squid Gonatus fabricii (Cephalopoda: Gonatidae) // J. Molluscan Studies, 2019. 00: 1-13. https://doi:10.1093/mollus/eyz023

Annotation

The squid Gonatus fabricii (Lichtenstein, 1818) is the most abundant pelagic cephalopod in the Arctic and the only squid to spend all of its life cycle in this region. Despite being highly abundant, its reproductive biology remains poorly known, and data on large maturing and mature specimens are especially rare. This study, based on extensive material (51 large specimens and >35,000 specimens in all), fills major gaps in the knowledge of the reproductive biology and ecology of G. fabricii. The fecundity of females ranged from 8,862 to 16,200 oocytes, with mature and late maturing specimens having between 8,862 to c. 10,000 and 11,402 oocytes, respectively. Oogenesis was synchronous, and oocyte resorption was observed; resorbed oocytes constituted up to 23.5% of fecundity. Between two to five ripe oocytes were observed, and these were 4.0–5.5 mm in diameter (maximum dimension). Males possessed between 77 and 257 spermatophores (length = 5.8–10.8 mm). Spermatophores were characterized by a cement body with well-developed collar and discs at the oral end, an ejaculatory apparatus longer than the cement body and the lack of a tapered, sharp tip to the cement body. Spermatophore size showed a uniform increase in relation to increasing male size. In newer spermatophores, the length, width and volume of the seminal reservoir also increased. Females possessed between 62 and 84 spermatangia (length = 1.8–2.6 mm); the spermatangia were present on the buccal membranes and lacked special attachment structures. Seminal receptacles were not found on the buccal membranes of females. Our findings are consistent with the hypothesis of geographically restricted spawning in G. fabricii. The study found evidence for one new breeding area in south-eastern Greenland. No differences in sizes at maturity were found between the breeding areas. Such geographically localized reproduction is relatively common in non-deep-water squids, but ismuch less common in deep-water squids. Localized reproduction may be especially important for G. fabricii because increased food availability in the epipelagic layers would likely increase the survival of epipelagic juveniles, with surface currents potentially aiding in their dispersal.

Keywords

Gonatus fabricii, boreoatlantic armhook squid, reproductive biology, ecology

The name of the journal

Journal of Molluscan Studies

URL

https://doi:10.1093/mollus/eyz023

Please use this ID to quote from or refer to the card

https://repository.kpfu.ru/eng/?p_id=206781&p_lang=2

Full metadata record

Field DC	Value	Language
dc.contributor.author	Golikov Aleksey Valentinovich	ru_RU
dc.contributor.author	Sabirov Rushan Mirzovich	ru_RU
dc.date.accessioned	2019-01-01T00:00:00Z	ru_RU
dc.date.available	2019-01-01T00:00:00Z	ru_RU
dc.date.issued	2019	ru_RU
dc.identifier.citation	Golikov A.V., Blicher M. E., Jørgensen L.L., Walkusz W., Zakharov D.V., Zimina O.L. and Sabirov R.M. Reproductive biology and ecology of the boreoatlantic armhook squid Gonatus fabricii (Cephalopoda: Gonatidae) // J. Molluscan Studies, 2019. 00: 1-13. https://doi:10.1093/mollus/eyz023	ru_RU
dc.identifier.uri	https://repository.kpfu.ru/eng/?p_id=206781&p_lang=2	ru_RU
dc.description.abstract	Journal of Molluscan Studies	ru_RU
dc.description.abstract	The squid Gonatus fabricii (Lichtenstein, 1818) is the most abundant pelagic cephalopod in the Arctic and the only squid to spend all of its life cycle in this region. Despite being highly abundant, its reproductive biology remains poorly known, and data on large maturing and mature specimens are especially rare. This study, based on extensive material (51 large specimens and >35,000 specimens in all), fills major gaps in the knowledge of the reproductive biology and ecology of G. fabricii. The fecundity of females ranged from 8,862 to 16,200 oocytes, with mature and late maturing specimens having between 8,862 to c. 10,000 and 11,402 oocytes, respectively. Oogenesis was synchronous, and oocyte resorption was observed; resorbed oocytes constituted up to 23.5% of fecundity. Between two to five ripe oocytes were observed, and these were 4.0–5.5 mm in diameter (maximum dimension). Males possessed between 77 and 257 spermatophores (length = 5.8–10.8 mm). Spermatophores were characterized by a cement body with well-developed collar and discs at the oral end, an ejaculatory apparatus longer than the cement body and the lack of a tapered, sharp tip to the cement body. Spermatophore size showed a uniform increase in relation to increasing male size. In newer spermatophores, the length, width and volume of the seminal reservoir also increased. Females possessed between 62 and 84 spermatangia (length = 1.8–2.6 mm); the spermatangia were present on the buccal membranes and lacked special attachment structures. Seminal receptacles were not found on the buccal membranes of females. Our findings are consistent with the hypothesis of geographically restricted spawning in G. fabricii. The study found evidence for one new breeding area in south-eastern Greenland. No differences in sizes at maturity were found between the breeding areas. Such geographically localized reproduction is relatively common in non-deep-water squids, but ismuch less common in deep-water squids. Localized reproduction may be especially important for G. fabricii because increased food availability in the epipelagic layers would likely increase the survival of epipelagic juveniles, with surface currents potentially aiding in their dispersal.	ru_RU
dc.language.iso	ru	ru_RU
dc.subject	Gonatus fabricii	ru_RU
dc.subject	boreoatlantic armhook squid	ru_RU
dc.subject	reproductive biology	ru_RU
dc.subject	ecology	ru_RU
dc.title	Reproductive biology and ecology of the boreoatlantic armhook squid Gona-tus fabricii (Cephalopoda: Gonatidae)	ru_RU
dc.type	Articles in international journals and collections	ru_RU