Die Inhalte dieser Seite sind leider nicht auf Deutsch verfügbar.
Seitenpfad:
Spiniferites delicatus
Zonneveld, K.A.F. and Pospelova V. (2015). A determination key for modern dinoflagellate cysts. Palynology 39 (3), 387- 407.
Filed characteristics
Spiniferites delicatus Reid 1974
Field characteristics:
Proximochorate cyst of circular to ovoidal shape with microgranulate to microreticulate periphragm and endophragm. Relatively high septa connect the gonal processes which are supported by skeletal rods. In plan view process tips have a characteristic petaloid shape. Archeopyle is precingular (type P).
Dimensions: Cyst body: 35 to 54 (width) x 40 to 60 (length) µm; length of processes: 29 µm.
Motile affinity: Probably a cyst of Gonyaulax spp.
Stratigraphic range: Lower-Pleistocene to Recent.
Comparison with other species:
The distinguishing characteristic of this species is the high sutural flanges connecting prosesses with skeletal rods and trifurcate processes. Other species do not have such rods. Again process length and shape may vary very much. Culture experiments have shown that the morphology of Spiniferites cysts can vary enormously. It is therefore hard to separate this species from other Spiniferites species.
Field characteristics:
Proximochorate cyst of circular to ovoidal shape with microgranulate to microreticulate periphragm and endophragm. Relatively high septa connect the gonal processes which are supported by skeletal rods. In plan view process tips have a characteristic petaloid shape. Archeopyle is precingular (type P).
Dimensions: Cyst body: 35 to 54 (width) x 40 to 60 (length) µm; length of processes: 29 µm.
Motile affinity: Probably a cyst of Gonyaulax spp.
Stratigraphic range: Lower-Pleistocene to Recent.
Comparison with other species:
The distinguishing characteristic of this species is the high sutural flanges connecting prosesses with skeletal rods and trifurcate processes. Other species do not have such rods. Again process length and shape may vary very much. Culture experiments have shown that the morphology of Spiniferites cysts can vary enormously. It is therefore hard to separate this species from other Spiniferites species.
Geographic distribution
Geographic distribution based on :
Zonneveld et al., 2013. Atlas of modern dinoflagellate cyst distribution based on 2405 datapoints. Review of Palaeobotany and Palynology, v. 191, 1-197
Zonneveld et al., 2013. Atlas of modern dinoflagellate cyst distribution based on 2405 datapoints. Review of Palaeobotany and Palynology, v. 191, 1-197
Spiniferites delicatus occurs in sub-tropical to equatorial regions with oligotrophic to mesotrophic conditions. It is mainly observed in coastal sites where upper water salinities can be slightly reduced by river discharge. Cysts are not observed where bottom waters are anoxic.
Distribution:
Spiniferites delicatus is restricted to the subtropic to equatorial coastal regions with exception of some sites in the temperate part of the North Atlantic Ocean. Highest abundances (up to 80%) occur in the eastern equatorial Atlantic and eastern Equatorial Pacific Oceans.
Environmental parameter range:
SST: -1.0 - 29.8°C (winter - spring), with summer SST: > 8°C SSS: 25.6 - 39.4 (spring - autumn), [P]: 0.06 - 0.62 μmol/l, [N]: 0.04 - 8.99 μmol/l, chlorophyll-a: 0.1 - 8.8 ml/l, bottom waters [O2]: 0.4 - 6.9 ml/l.
Comparison with other records:
Apart from the records in the dataset of this Atlas, Spiniferites delicatus has been observed in surface sediments of coastal shelf-sites of the Benguela upwelling area and the Lisbon Bay (North-East Atlantic, Joyce et al., 2005; Ribeiro and Amorim, 2008; Pitcher and Joyce, 2009). In seasonal distribution and sediment trap studies of Omura Bay (West Japan) and Lisbon Bay (northeast Atlantic Ocean) cysts production occurs throughout the year without preference for a certain season (Fujii and Matsuoka, 2006; Ribeiro and Amorim, 2008)
Spiniferites delicatus is restricted to the subtropic to equatorial coastal regions with exception of some sites in the temperate part of the North Atlantic Ocean. Highest abundances (up to 80%) occur in the eastern equatorial Atlantic and eastern Equatorial Pacific Oceans.
Environmental parameter range:
SST: -1.0 - 29.8°C (winter - spring), with summer SST: > 8°C SSS: 25.6 - 39.4 (spring - autumn), [P]: 0.06 - 0.62 μmol/l, [N]: 0.04 - 8.99 μmol/l, chlorophyll-a: 0.1 - 8.8 ml/l, bottom waters [O2]: 0.4 - 6.9 ml/l.
Comparison with other records:
Apart from the records in the dataset of this Atlas, Spiniferites delicatus has been observed in surface sediments of coastal shelf-sites of the Benguela upwelling area and the Lisbon Bay (North-East Atlantic, Joyce et al., 2005; Ribeiro and Amorim, 2008; Pitcher and Joyce, 2009). In seasonal distribution and sediment trap studies of Omura Bay (West Japan) and Lisbon Bay (northeast Atlantic Ocean) cysts production occurs throughout the year without preference for a certain season (Fujii and Matsuoka, 2006; Ribeiro and Amorim, 2008)