Frontal zone analysis at the mouth of a fjord — Jervis Inlet, British Columbia

Parsons, Timothy R.; Dovey, H.M.; Cochlan, William P.; Perry, R. Ian; Crean, P.B.

doi:10.1080/00364827.1984.10420599

Cited by 7 publications

(2 citation statements)

References 10 publications

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“…The effect of this jet on plankton biomass was most pronounced at the junction of Narrows and Sechelt Inlets. A similar phenomenon was observed by Parsons et al (1984b) on the outer side of Skookumchuk Narrows. The middle of Sechelt Inlet has the deepest water and is least affected by inputs (nutrients, fresh water, etc.)…”

Section: Discussionsupporting

confidence: 82%

Phytoplankton ecology of Sechelt Inlet, a fjord system on the British Columbia coast. I. General features of the nano- and microplankton

Haigh¹,

Taylor²,

Sutherland³

1992

Mar. Ecol. Prog. Ser.

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The Sechelt Inlet complex (British Columbia, Canada), Including Narrows and Salmon Inlets, was sampled from h4ay 1988 to September 1990 in order to d e s c r~b e the nutrient and plankton regimes. Species succession w i t h~n the inlet was typical for temperate unpolluted waters despite aquaculture activity and nutrient-loading from the town of Sechelt at the southern end. The N : P ratio in the upper 21 m of 8.3, which is well below the Redfield ratio of 16, suggests an N-limited system. The ratio is also lower than those found in adjacent systems, and supports the a s s u~n p t~o n that Sechelt Inlet is the least influenced by oceanic waters. The N : P ratio also c o~n c~d e s with the optimum ratio for Skeletonerna costaturn of 8.1 which suggests that either the system provided an optimal nutrient regime for this diatom or the dominance of S. costatum determined ambient N:P ratios. The spring bloom, dominated by S. costatum and ThalaSS~~Sira nordenskioeldii, occurred early (in March) due to the combined influence of stratification, created by runoff from Salmon Inlet, and shelter from wind exposure. By summer the waters became depleted of nitrate down to 5 m, and nanoplankton, composed chiefly of cryptomonads and Chrysochrornulina spp., prevailed. Bimodal peaks in nanoflagellate biomass occurred each summer, with the cryptomonads remaining regular components. Under normal meteorological conditions Chrysochromulina spp. \vould codominate but during 1989, storm activity in May somehow caused the replacement of the prymnesiomonads by the silicoflagellate Dictyocha speculurn. The latter occurred In ~t s askeletal form during the late summer nanoflagellate peak. The water injected through the mouth of Sechelt Inlet by a tidal jet combined with water overlying the anoxic bottom of inner Narrows Inlet and caused stimulation of plankton growth at the confluence of these 2 inlets. There was also h~g h biomass at the shallow southern end possibly due to increased mixing over a sill and m~l d eutrophication.

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Section: Discussionsupporting

confidence: 82%

Phytoplankton ecology of Sechelt Inlet, a fjord system on the British Columbia coast. I. General features of the nano- and microplankton

Haigh¹,

Taylor²,

Sutherland³

1992

Mar. Ecol. Prog. Ser.

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“…Floodgate et al (1981) found elevated rates of urea decomposition in frontal water, relative to mixed and stratified water, which were G3 Inter-Research/Printed in F. R. Germany concomitant with higher dissolved urea concentrations. Furthermore, high rates of carbon and nitrate uptake have been observed in the proximity of a front by Parsons et al (1984). Recently Holligan et al (1984) calculated that ammonium excretion by zooplankton could account for >50 % of the potential phytoplankton requirements on the stratified side of a front.…”

Section: Introductionmentioning

confidence: 99%

Time course of uptake of inorganic and organic nitrogen by phytoplankton in the Strait of Georgia: comparison of frontal and stratified communities

Price¹,

Cochlan²,

Harrison³

1985

Mar. Ecol. Prog. Ser.

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In both frontal and stratified water of the Strait of Georgia, changes in dissolved nitrogen concentrations provided evidence for the simultaneous uptake of ammonium, nitrate and urea by a summer phytoplankton community. Chlorophyll a specific uptake rates of ammonium and urea were ca 2 and 2.4 times greater in stratified water than in frontal water, whereas chlorophyll a specific nitrate uptake rates were ca 1.6 times greater in frontal water. Ammonium and urea regeneration rates, calculated using a mass balance approach, were similar in frontal water, but urea regeneration rates were 2 to 5 times greater in the stratified water during the first 12 h of the experiment. Increases in particulate nitrogen could not be accounted for by corresponding decreases in total concentration of dissolved inorganic nitrogen and urea, or by 15N accumulation in the particulates. In frontal water the change in total dissolved inorganic nitrogen and urea consistently overestimated the change in particulate nitrogen, and in stratified water the change in total dissolved inorganic nitrogen and urea consistently underestimated the change in particulate nitrogen. These data suggest that the plankton community In frontal water was losing nitrogen in the form of dissolved organic nitrogen. By contrast, the plankton community in stratified water took up nitrogen compounds which were not measured as part of the total dissolved inorganic and urea nitrogen, but were most likely dissolved organic nitrogen compounds. Results stress the importance of determining uptake rates of all 3 nitrogen substrates (NHfi, N O and urea) using 15N isotopes and by simultaneously measuring the change in concentration of these compounds throughout the incubation period.

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