Naslov
Combination coccospheres from the eastern Adriatic coast (Mediterranean Sea)

Autori
Šupraha, Luka ; Ljubešić, Zrinka ; Henderiks, Jorijntje

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, ostalo

Izvornik
Journal of Nannoplankton Research INA15 abstracts / Bybell, L. M. - Bohol, 2015, 81-81

Skup
15th International Nannoplankton Association meeting

Mjesto i datum
Bohol, Filipini, 07.03.2015. - 16.03.2015

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Coccolithophores; heteromorphic life cycle; estuary; Adriatic Sea

Sažetak
Coccolithophores commonly exhibit a heteromorphic life cycle, alternating between morphologically distinct heterococcolith (diploid) and holococcolith (haploid) phases (Young et al., 2005). Transition between the two phases is occasionally observed in field samples in the form of combination coccospheres containing both heterococcoliths and holococcoliths. Such coccospheres have great taxonomic importance as they link previously unrelated morphospecies to a common life cycle (Cros et al., 2000). Here, we present combination coccospheres that were observed in a survey of coccolithophore distribution and diversity along the Krka River estuary (eastern Adriatic Sea). Samples were collected at six stations along a coastal-to-estuarine transect during winter and summer 2013. Water samples from four to six different depths were obtained, using a series of 5L Niskin water samplers. Seawater was filtered in a pre-determined volume onto a polycarbonate filter (0.8 µm pore size), rinsed with bottled fresh water, and oven dried at 50°C. Samples were sputter-coated with gold and studied under a Zeiss Supra35-VP scanning electron microscope. Of the 11 combinations that were detected, four were previously described: Coronosphaera mediterranea* - Calyptolithina wettsteinii, Coronosphaera mediterranea* - Zygosphaera hellenica, Syracosphaera bannockii* – Corisphaera sp. type A, and Syracosphaera pulchra* – Calyptrosphaera oblonga. Combination coccospheres of Acanthoica quattrospina* – Sphaerocalyptra sp. 1, Syracosphaera didyma – Homozygosphaera arethusae*, and Syracosphaera marginaporata* – Anthosphaera sp. type B were verified. A new life cycle association was observed between Syracosphaera hirsuta and Corisphaera strigilis*, as well as Alisphaera unicornis* and a nannolith-producing Polycrater galapagensis. A possible association between Rhabdosphaera xiphos* and an undescribed holococcolithophore needs to be verified in future investigations. Following the taxonomic principle of priority, species names marked with (*) should be used for both the heterococcolith and the holococcolith phase.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

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