Cysts and Sediments: <i>Gonyaulax Polyedra (Lingulodinium Machaerophorum)</i> in Loch Creran

Lewis, Jane

doi:10.1017/s0025315400028812

Cited by 56 publications

(14 citation statements)

References 19 publications

(24 reference statements)

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“…Experimental studies (e.g. Lewis et al,1985;and Sullivan and Swift, 2003) have shown that cyst production is highly dependent on the water column stratification triggering photosyntetic activity. The stratification of the water column varies seasonally depending on wind patterns, temperature and salinity changes, and river discharge.…”

Section: Dinocyst Assemblagesmentioning

confidence: 99%

Spatial distribution of benthic foraminiferal stable isotopes and dinocyst assemblages in surface sediments of the Trondheimsfjord, central Norway

et al. 2013

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Instrumental records from the Norwegian Sea and the Trondheimsfjord show evidence that changes of bottom water temperature and salinity in the fjord are linked to the salinity and temperature variability of the North Atlantic Current (NAC). Changes in primary productivity and salinity in the surface and intermediate water masses in the Trondheimsfjord as well as the fjord sedimentary budget are mainly driven by changes in riverine input. In this study we use 59 surface sediment samples that are evenly distributed in the fjord to examine whether dinocyst assemblages and stable isotope ratios of benthic foraminifera reflect the present-day hydrology and can be used as palaeoceanographic proxies. In general, modern benthic δ¹⁸O and δ¹³C values decrease from the fjord entrance towards the fjord head with lowest values close to river inlets. This is essentially explained by gradients in the amounts of fresh water and terrigenous organic matter delivered from the hinterland. The distribution of benthic δ¹³C ratios across the fjord is controlled by the origin (terrigenous vs. marine) of organic matter, local topography-induced variability in organic matter flux at the water–sediment interface, and organic matter degradation. The dinocyst assemblages display the variations in hydrography with respect to the prevailing currents, the topography, and the freshwater and nutrient supply from rivers. The strength and depth of the pycnocline in the fjord strongly vary seasonally and thereby affect water mass characteristics as well as nutrient availability, temporally creating local conditions that explain the observed species distribution. Our results prove that dinocyst assemblages and benthic foraminiferal isotopes reliably mirror the complex fjord hydrology and can be used as proxies of Holocene climatic variability

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Section: Dinocyst Assemblagesmentioning

confidence: 99%

Spatial distribution of benthic foraminiferal stable isotopes and dinocyst assemblages in surface sediments of the Trondheimsfjord, central Norway

et al. 2013

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“…1), a sea-loch located on the Scottish west coast. Sampling took place in the upper section of the outer loch at site C5 (56°32.00N 05°19.64W) where the depth is 27 m. This particular site is a known area of fine sediment and diatom resting stage accumulation (Lewis, 1988;Lewis & Jones, 1990).…”

Section: Collection Of Samplesmentioning

confidence: 99%

Thalassiosiraspecies (Bacillariophyceae) from a Scottish sea-loch

Harris

Medlin

Lewis

et al. 1995

European Journal of Phycology

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During the spring diatom blooms of I992 and 1993 in Loch Creran, Scotland, regular water column and sediment samples were collected, examined, and species composition of the phytoplankton determined. Thalassiosira species were found to be a major bloom constituent. Species were identified from specimens cultured from sediments and isolated from vertical net hauls, using light and scanning electron microscopy. Of the 17 species positively determined, only Thalassiosira angulata, T. anguste-lineata, T. eccentrica, 7". gravida, T. minima, T. nordenskioe]dii, T. rotu]a and 72 tenera have been previously reported in Scottish waters. Other species, for example Tha]assiosira pseudonana and T. punctigera, have been noted elsewhere in the British Isles but not along the Scottish west coast. Several species, namely Thalassiosira concaviuscula, 7. constricta, T. delicatula, T. kuschirensis, T. oceanica, T. pacifica and T. tealata, are new records for the British Isles. One unidentified taxon is illustrated. Descriptions, illustrations and a key are provided for the 18 taxa.

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“…Nevertheless, they have great importance in better understanding the precise biological function of this specific developmental stage and gaining more basic data for phylogenetic reconstructions. Ecological stress such as temperature and light [43] and reduced availability of iron or nutrients may interfere with the interpretation of cellular ultrastructure [44]–[45]. We have aimed to avoid such bias by investigating cells held under constant culture conditions.…”

Section: Discussionmentioning

confidence: 99%

Ultrastructure of Calcareous Dinophytes (Thoracosphaeraceae, Peridiniales) with a Focus on Vacuolar Crystal-Like Particles

et al. 2013

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Biomineralization in calcareous dinophytes (Thoracosphaeracaea, Peridiniales) takes place in coccoid cells and is presently poorly understood. Vacuolar crystal-like particles as well as collection sites within the prospective calcareous shell may play a crucial role during this process at the ultrastructural level. Using transmission electron microscopy, we investigated the ultrastructure of coccoid cells at an early developmental stage in fourteen calcareous dinophyte strains (corresponding to at least ten species of Calciodinellum, Calcigonellum, Leonella, Pernambugia, Scrippsiella, and Thoracosphaera). The shell of the coccoid cells consisted either of one (Leonella, Thoracosphaera) or two matrices (Scrippsiella and its relatives) of unknown element composition, whereas calcite is deposited in the only or the outer layer, respectively. We observed crystal-like particles in cytoplasmic vacuoles in cells of nine of the strains investigated and assume that they are widespread among calcareous dinophytes. However, similar structures are also found outside the Thoracosphaeraceae, and we postulate an evolutionarily old physiological pathway (possibly involved in detoxification) that later was specialized for calcification. We aim to contribute to a deeper knowledge of the biomineralization process in calcareous dinophytes.

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Cysts and Sediments: Gonyaulax Polyedra (Lingulodinium Machaerophorum) in Loch Creran

Cited by 56 publications

References 19 publications

Spatial distribution of benthic foraminiferal stable isotopes and dinocyst assemblages in surface sediments of the Trondheimsfjord, central Norway

Spatial distribution of benthic foraminiferal stable isotopes and dinocyst assemblages in surface sediments of the Trondheimsfjord, central Norway

Thalassiosiraspecies (Bacillariophyceae) from a Scottish sea-loch

Ultrastructure of Calcareous Dinophytes (Thoracosphaeraceae, Peridiniales) with a Focus on Vacuolar Crystal-Like Particles

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