Recent Advances and Future Directions in Multi-Disciplinary In Situ Oceanographic Measurement Systems

Dickey, T. D.

doi:10.1007/978-94-009-3023-0_29

Cited by 24 publications

(16 citation statements)

References 122 publications

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“…All measurements were made aboard the RV 'Knorr' in the vicinity of a drifting buoy which supported the multi-variable profiler (Dickey et al 1986, Dickey 1988. Stns 4 and 19 were both located at 35" N, 70" W and were occupied during 3 to 7 April and 19 to 25 April 1985, respectively.…”

Section: Methodsmentioning

confidence: 99%

Evidence for phytoplankton succession and chromatic adaptation in the Sargasso Sea during spring 1985

Bidigare¹,

Marra²,

Dickey³

et al. 1990

Mar. Ecol. Prog. Ser.

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Measurements of photosynthetic p~g m e n t s , nutnents, spectral Irradiance and vanous physical parameters were performed in the western Sargasso Sea (35"N, 70°W) to ~n v e s t~g a t e the factors affecting phytoplankton blomass dlstribut~ons Algal plgment concentrations and c o m p o s~t~o n s measured during spring 1985 showed cons~derable time-dependent v a n a t~o n s which were cons~stent with those documented by dlrect mlcroscoplc observation D u r~n g early Apnl, 2-fold Increases In chlorophyll a and fucoxanthln were measured on a relatively short tlme scale of days The presence of a d~atom-dominated community malnly specles of the genera Rhlzosolen~a and Chaetoceros, suggested that we were witnessing a stage of the spring bloom Upon return to thls location 2 wk later, the diatom bloom was replaced by a considerably more diverse phytoplankton assemblage consisting of prymnes~ophytes, cyanobacter~a, d~noflagellates, green algae (~ncludlng praslnophytes) and d~a t o m s The vert~cal structures d~splayed by ~n d i v~d u a l accessory plgments dunng Apnl were markedly simllar and suggest that the major phytoplankton taxa were not un~formly distributed In the upper 200 m The phytoplankton were d~s t r~b u t e d as broadly overlapp~ng layers, 1~1th cyanobacterla and diatoms most abundant In the m~x e d layer, prymnesiophytes at lntermed~ate depths, and green algae (Including prasinophytes) deeper In the water column Results p r o v~d e descnptive evidence for a rapid succession of chromatically-adapted phytoplankton during springtime in the Sargasso Sea

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Section: Methodsmentioning

confidence: 99%

Evidence for phytoplankton succession and chromatic adaptation in the Sargasso Sea during spring 1985

Bidigare¹,

Marra²,

Dickey³

et al. 1990

Mar. Ecol. Prog. Ser.

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“…In contrast, in the open ocean part of the Irminger Sea pre-bloom conditions and a retarded development of the phytoplankton population were observed with low, more uniform distribution of chlorophyll a. The nitrate drawdown was estimated at between 16.5 and 270 µm m -2 (mean 108.6 ± 82.2 µm m -2 ) and the new primary production was estimated to be between 1.3 and 21.4 g C m -2 (8.6 ± 6.5 g C m distribution is associated with many processes on time scales ranging from seconds to months and covering spatial scales from millimetres to many hundreds of kilometres (Dickey 1988, Garçon et al 2001, Read et al 2002, Martin 2003 and references therein).…”

Section: Introductionmentioning

confidence: 99%

Freshwater control of onset and species composition of Greenland shelf spring bloom

Waniek¹,

Holliday²,

Davidson³

et al. 2005

Mar. Ecol. Prog. Ser.

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. The phytoplankton community in the melting ice zone consisted of Phaeocystis sp., small flagellates (< 4 µm) and picoplankton, while diatoms were less abundant. Phaeocystis sp. contributed up to 15 g C m -2 to the carbon biomass (70% of total carbon measured), whereas the contribution of diatoms and flagellates to carbon biomass was relatively low, with up to 1.2 g C m -2 (5.7%) and up to 2.5 g C m -2 (11.7%), respectively. On the shelf the bloom starts at the very beginning of stabilisation (elevated N 2 values) which results solely from the release of meltwater. The locally restricted water stability leads to a patchy phytoplankton distribution in the Irminger Sea.

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“…Acoustic (e.g., Holliday 1980;Pieper and Holliday 1984;Greene and Wiebe 1990) and other remote-imaging technologies (e.g., Ortner et al 1981;Dickey 1988;Davis et al 1992a;Herman 1992), were not designed for the identification of invertebrate larvae to species.…”

Section: Recommendations For Future Researchmentioning

confidence: 99%

Temporal variability and vertical structure in larval abundance : the potential roles of biological and physical processes

Garland¹

2000

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Recruitment variability in benthic invertebrate populations results from variability in planktonic larval supply and from processes occurring during and after larval settlement onto the seafloor. The focus of this thesis is on the temporal and spatial variability in larval supply, the extent to which planktonic larval distributions are determined by larval behaviors and physical processes, and how differentially distributed larvae are advected to potential adult habitats by inner-shelf circulation such as wind-driven upwelling and downwelling. This research capitalized on two sets of larval concentration time series, collected by moored zooplankton pumps, and complemented by synoptic hydrographic time-series data.High variability was observed in larval concentration time series, yet the variations were nonrandom. Within the context of the sampling regime, two dominant modes of variability existed. One source of variation was associated with the synoptic meteorological time scale, and the other with the diurnal time scale. Over relatively long time scales, larvae were associated with particular water masses, defined by temperature-salinity characteristics. Within a particular water mass, group-specific vertical patterns were observed over both long and short time scales. "Lowfrequency" temporal variatious resulted primarily from wind-driven cross-shelf transport of water masses in which larvae were differentially distributed relative to the thermocline. "Higherfrequency" variations were attributed to diel vertical migrations. These findings suggest that larvae were passive to the degree that they were horizontally advected with certain water masses, but active to the degree that they could alter their vertical position in the water column.Local hydrodynamics, larval associations with specific water masses, and the vertical structure of larvae resulted in differential larval transport to potential adult habitats. Larval data indicate the times and places of possible coupling between water-column organisms and the benthos, leading to certain predictions regarding when and where larval settlement should be greatest.Time-series measurements of larval concentration yield a new perspective on the temporal and spatial variability in larval distributions at an inner-shelf site. Determining how processes operating at the synoptic and diurnal time scales are coupled, and to what extent they influence recruitment variability, represents a challenging extension of this work.

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Recent Advances and Future Directions in Multi-Disciplinary In Situ Oceanographic Measurement Systems

Cited by 24 publications

References 122 publications

Evidence for phytoplankton succession and chromatic adaptation in the Sargasso Sea during spring 1985

Evidence for phytoplankton succession and chromatic adaptation in the Sargasso Sea during spring 1985

Freshwater control of onset and species composition of Greenland shelf spring bloom

Temporal variability and vertical structure in larval abundance : the potential roles of biological and physical processes

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