Nutrient transports in a Swedish estuary

Wilmot, W.L.; Toll, Peter; Kjerfve, Björn

doi:10.1016/0272-7714(85)90095-2

Cited by 12 publications

(2 citation statements)

References 6 publications

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“…The 3 areas were the inner basin of this bay (Inner Bay), a n outer basin of the same bay (Outer Bay) and a nearby reference area (Asko area) which is not measurably affected by the nutrient discharge. Water circulation in the Bay is driven by winds and freshwater runoff as the Baltic lacks tides (Wilmot et al 1985). The zooplankton seasonal dynamics has been studied in these areas since 1977 as part of a research project on eutrophication in the Baltic Sea (Elmgren & Larsson 1987).…”

Section: Methodsmentioning

confidence: 99%

Dynamics of planktivory in a coastal area of the northern Baltic Sea

Rudstam¹,

Hansson²,

Johansson³

et al. 1992

Mar. Ecol. Prog. Ser.

115

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We studied the seasonal dynamics of zooplanktivory by the major zooplanktivores (sprat Sprattus sprattus, herring Clupea harengus and the mysid shrimp Mysis mrxta) in 3 coastal areas of the northern Baltic Sea proper from the beginning of July through the end of October, 1985. The 3 areas are within 30 km of each other and dffer in nutrient loading and primary productivity. Consumption rates were obtained by combining abundance estimates of the planktivores (from Bongo nets, gill nets and acoustics) with diet analysis and bioenergetics models. Both the dominating planktivore groups and total planktivory rates changed over the study period. Sprat and yearling herring were the major zooplanktivores in July and August whereas young-of-year herring and M. mixta were more important in September and October. Planktivory rates increased from low levels at the beginning of July to a peak in August coinciding with a late summer decline in crustacean zooplankton biomass. Planktivory rates were lower than estimated zooplankton production rates in July and early August when zooplankton biomass was increasing and similar to or higher than production in the autumn when zooplankton biomass declined. Both clupeids and mysids consistently selected prey in the order cladocerans (Bosmina longispina maritima and Pleopis polyphemoides) > Eurytemora affinis hirundoides copepods > Acartia copepods. The selected species represented a smaller proportion of total zooplankton biomass and decreased earlier in the season in the least productive area, indicating a larger and earlier effect of planktivory in that area compared to the most productive area.

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Section: Methodsmentioning

confidence: 99%

Dynamics of planktivory in a coastal area of the northern Baltic Sea

Rudstam¹,

Hansson²,

Johansson³

et al. 1992

Mar. Ecol. Prog. Ser.

115

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“…The water masses of the bay are generally stratified from late spring to early autumn by a thermocline at a depth of 1 O-l 5 m. Outside the bay (Sta. Bl), a distinct thermocline is seen less often due to more exposed conditions, and the mixed surface layer tends to be deeper, often 15-20 m. The water circulation is mainly govcrncd by wind, freshwater runoff, and barotropic currents (Wilmot et al 1985;Engqvist 1988). There is also an intermediary water exchange (cf.…”

mentioning

confidence: 99%

Detrital bedrock elements as tracers of settling resuspended particulate matter in a coastal area of the Baltic Sea

Blomqvist

Larsson

1994

Limnology & Oceanography

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Particulate matter settling out of the trophogenic layer was collected in sediment traps at five stations during 5 yr in a coastal area of the Baltic Sea. Al, Fe, and Ti in the intercepted matter were inferred to bc due mainly to the presence of fine-grained bedrock detritus and were used as markers to calculate the proportion of primary settling matter and resuspended sediment in the collected matter. Considerable variations within and between years, seasons, and nearby stations were found for gross sedimentation rate and for the ratio between primary settling matter and resuspended sediment. This pattern also applied to organic C. A predominance of primary settling matter was recorded mainly in spring. Resuspended matter was a large component in the annual budget for all years and stations. In fact, the resuspended portion commonly exceeded 50%, and periods without resuspension seem to occur rarely or never in the investigated area.

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