Long-term changes in primary production and chlorophyll concentrations in the Southern Baltic

Nakonieczny, J.; Ochocki, S.; Renk, H.

doi:10.3750/aip1991.21.s.15

Cited by 9 publications

(2 citation statements)

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“…Maximum concentrations of chl a occurring in the southern Baltic during the sprlng bloom usually remain in the range of 10 to 20 pg dm-3, although there have been some cases in which values exceeding 50 pg dm-"ere recorded (Nakonieczny et al 1991., Renk et al 1992, Lataia 1993). Values observed during our studies in the coastal zone of the Gulf of Gdansk were within the above-mentioned average range, except for the record-high chl a concentration observed in April, which resulted from a massive bloom of the dinoflagellate Peridiniella catenata.…”

Section: Primary Production and Exudate Releasementioning

confidence: 99%

Phytoplankton primary production and its utilization by the pelagic community in the coastal zone of the Gulf of Gdansk (southern Baltic)

Witek¹,

Ochocki²,

Maciejowska³

et al. 1997

Mar. Ecol. Prog. Ser.

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In t h~s study we estimated the amount and fate of phytoplankton primary product~on in the coastal zone of the Gulf of Gdansk, Poland, an area exposed to nutnent enrichment from the Vistuld R~v e r and nearby inunlcipal agglomeration The ~n v e s t i g a t~o n s were carned out at 2 sites d u r~n g 5 months in 1993 (February, April, May, August and October). A prolonged bloom pei-iod occurred in the coastal zone, as compared to the open Gulf and the open sea waters. From Aprll until October most values of gross primary production in the near-surface layer were in the range 100 to 500 m g C m-'' d 1 Phytoplankton net exudate release constituted on average 5 % of the gross prlmai-y production, total exudate release was estimated to be about 2 times h~gher. Bacterial production in the growth season was relatively low (the mean value l y~n g between 5 and 9 % of gloss primary production), nevertheless, the microbial community (bactena and protozoans) u t~l~z e d a large proportion of primary production (from about 50% in April and May to 16'%, in October). Usually direct protozoan grazing on phytoplankton exceeded bacterial uptake of the phytoplankton exudates. In winter, summer and autumn communlty respiration exceeded depth-averaged primary production, ~n d~c a t i n g that external energy sources ( s e d~m e n t resuspension, allochthonous organic matter) play a substantial role in communlty metabol~sm.

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Section: Primary Production and Exudate Releasementioning

confidence: 99%

Phytoplankton primary production and its utilization by the pelagic community in the coastal zone of the Gulf of Gdansk (southern Baltic)

Witek¹,

Ochocki²,

Maciejowska³

et al. 1997

Mar. Ecol. Prog. Ser.

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“…It seems that after 1985, both inorganic nutrients (nitrogen and phosphorus, NEHRING and MATTHAUS, 1991) and primary production (HELCOM, 1996) did not further increase. Numerous observations in coastal areas of the Baltic Sea confirmed the drastic increase in inorganic nutrients and primary production during the seventies and eighties (LASSIG et al, 1978;GARGAS et al, 1980;ROSENBERG et al, 1990;NAKONIECZNY et al, 1991;RICHARDSON and HEILMANN, 1995;WITEK et al, 1997). The increased nutrient load led to a drastic decline in water quality in coastal areas of the Baltic Sea (ACKEFORS et al., 1975;H0JERLEV, 1989;R E N K et a/., 1991;MASKE, 1994).…”

Section: Characteristics Of the Boddenmentioning

confidence: 95%

Salinity, Inorganic Nutrients, and Primary Production in a Shallow Coastal Inlet in the Southern Baltic Sea (Nordrügenschen Bodden) Results from Long‐Term Observations (1960–1989)

Hübel

Wolff

Meyer‐Reil

1998

International Review of Hydrobiology

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The Nordrügenschen Bodden waters are a shallow coastal inlet of the Southern Baltic Sea consisting of individual basins, some of which are joined only via small connections. The Bodden are characterized by pronounced horizontal gradients in hydrographical, chemical and biological parameters. Whereas concentrations of inorganic nutrients increase, salinity decreases with increasing distance from the connection to the Baltic Sea. Between 1960 and 1989 long‐term variations of salinity, inorganic nutrients (ammonium, nitrate, phosphate), Secchi disk visibility, and planktonic primary production were monitored at 6 locations throughout the Bodden. The gradients were most pronounced during the first period of observation (1960–1963). Between 1960 and 1985 concentrations of inorganic nutrients in the adjacent Arkona Sea increased up to values several times higher than the previous concentrations. This increased nutrient load in the Baltic Sea was reflected by higher nutrient concentrations and higher primary production in the outer and central parts of the Nordrügenschen Bodden. Between 1963 and 1965 the shipping channel between the outer (Libben) and the inner part (Großer Jasmunder Bodden) of the Bodden chain was dredged. This led to an improvement of water exchange between the Baltic Sea and the Bodden, resulting in a significant reduction of the gradients of chemical and biological parameters. Whereas salinity and Secchi disk visibility increased, inorganic nutrients, and primary production decreased. This was most obvious in the inner parts of the Bodden where the water quality was improved. The trophic status of the Kleiner Jasmunder Bodden is still worrying. This Bodden represents the innermost part of the Nordrügenschen Bodden connected with the Großer Jasmunder Bodden only via a small flood gate. Unless the water exchange is drastically improved, the Kleiner Jasmunder Bodden will retain its hypertrophic status in the longer term. The future development of the trophic status of the Bodden is discussed.

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Long-Term Investigations in Brackish Ecosystems

Schubert

Wasmund

Sellner

2010

Long-Term Ecological Research

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Long-term changes in primary production and chlorophyll concentrations in the Southern Baltic

Cited by 9 publications

References 0 publications

Phytoplankton primary production and its utilization by the pelagic community in the coastal zone of the Gulf of Gdansk (southern Baltic)

Phytoplankton primary production and its utilization by the pelagic community in the coastal zone of the Gulf of Gdansk (southern Baltic)

Salinity, Inorganic Nutrients, and Primary Production in a Shallow Coastal Inlet in the Southern Baltic Sea (Nordrügenschen Bodden) Results from Long‐Term Observations (1960–1989)

Long-Term Investigations in Brackish Ecosystems

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