Molecular and physiological responses of two classes of marine chromophytic phytoplankton (Diatoms and Prymnesiophytes) during the development of nutrient stimulated blooms

Title
Molecular and physiological responses of two classes of marine chromophytic phytoplankton (Diatoms and Prymnesiophytes) during the development of nutrient stimulated blooms
Publication Type
Journal Article
Year of Publication
2000
Authors

Wyman M, Davies JT, Crawford DW, Purdie DA

Journal
Applied and Environmental Microbiology
Volume
66
Pagination
2349-2357
ISBN Number
Keywords

mesocosm, Bergen, Espergend, 11 m3, nutrient addition, phytoplankton, DNA probes, RubisCO, Primary production, Norway

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Improving marine ecosystem models: Use of data assimilation and mesocosm experiments

Title
Improving marine ecosystem models: Use of data assimilation and mesocosm experiments
Publication Type
Journal Article
Year of Publication
2000
Authors

Vallino JJ

Journal
Journal of Marine Research
Volume
58
Pagination
117-164
ISBN Number
Keywords

mesocosm, model, parameter estimation, DOM, 7 m3, Woods Hole Great Harbor, USA

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Effect of prey size on vulnerability of copepods to predation by the scyphomedusae Aurelia aurita and Cyanea sp.

Title
Effect of prey size on vulnerability of copepods to predation by the scyphomedusae Aurelia aurita and Cyanea sp.
Publication Type
Journal Article
Year of Publication
2000
Authors

Suchman CL, Sullivan BK

Journal
Journal of Plankton Research
Volume
22
Pagination
2289-2306
ISBN Number
Keywords

mesocosm, medusae, copepods, predator-prey, land based, 13 m3, Narragansett Bay, USA

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Net accumulation and flux of dissolved organic carbon and dissolved organic nitrogen in marine plankton communities

Title
Net accumulation and flux of dissolved organic carbon and dissolved organic nitrogen in marine plankton communities
Publication Type
Journal Article
Year of Publication
2000
Authors

Sondegaard M, Williams PJB, Cauwet G, Riemann B, Robinson C, Terzic S, Malcolm E, Woodward S, Worm J

Journal
Limnology & Oceanography
Volume
45
Pagination
1097-1111
ISBN Number
Keywords

mesocosm, nutrient addtion, Espegrend, Norway, 11 m3, DOC, DON, fluxes, plankton communities

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Reduced calcification of marine plankton in response to increased atmospheric CO2

Title
Reduced calcification of marine plankton in response to increased atmospheric CO2

Publication Type
Journal Article

Year of Publication
2000

Authors

Riebesell U, Zondervan I, Rost B, Tortell PD, Zeebe RE, Morel FMM

Journal
Nature

Volume
407

Pagination
364-367

ISBN Number

Keywords

co2, acidification, Plankton, carbonate chemistry, mesocosm, Espegrend, Bergen, 11 m3, Norway

Abstract
The formation of calcareous skeletons by marine planktonicorganisms and their subsequent sinking to depth generates acontinuous rain of calcium carbonate to the deep ocean andunderlying sediments1. This is important in regulating marinecarbon cycling and ocean±atmosphere CO2 exchange2. The presentrise in atmospheric CO2 levels3 causes signi®cant changes insurface ocean pH and carbonate chemistry4. Such changes havebeen shown to slow down calci®cation in corals and corallinemacroalgae5,6, but the majority of marine calci®cation occurs inplanktonic organisms. Here we report reduced calcite productionat increased CO2 concentrations in monospeci®c cultures of twodominant marine calcifying phytoplankton species, the coccolithophoridsEmiliania huxleyi and Gephyrocapsa oceanica. Thiswas accompanied by an increased proportion of malformedcoccoliths and incomplete coccospheres. Diminished calci®cationled to a reduction in the ratio of calcite precipitation toorganic matter production. Similar results were obtained inincubations of natural plankton assemblages from the northPaci®c ocean when exposed to experimentally elevated CO2levels. We suggest that the progressive increase in atmosphericCO2 concentrations may therefore slow down the production ofcalcium carbonate in the surface ocean. As the process of calci®cationreleases CO2 to the atmosphere, the response observed herecould potentially act as a negative feedback on atmospheric CO2levels

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Effects of ultraviolet- B radiation on simultaneous carbon and nitrogen transport rates by estuarine phytoplankton during a week-long mesocosm study

Title
Effects of ultraviolet- B radiation on simultaneous carbon and nitrogen transport rates by estuarine phytoplankton during a week-long mesocosm study
Publication Type
Journal Article
Year of Publication
2000
Authors

Mousseau L, Gosselin M, Levasseur M, Demers S, Fauchot J, Roy S, Villegas PZ, Mostajir B

Journal
Marine Ecology Progress Series
Volume
199
Pagination
69-81
ISBN Number
Keywords

Canada, mesocosm, 3.2 m3, Nitrogen transport, Photoinhibition, Photosynthesis, phytoplankton, St. Lawrence estuary, land based, Pointe au Pere research station Quebec, UVB

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The effect of food on the determination of sex ratio in Calanus spp.: evidence from experimental studies and field data

Title
The effect of food on the determination of sex ratio in Calanus spp.: evidence from experimental studies and field data

Publication Type
Journal Article

Year of Publication
2000

Authors

Irigoien X, Obermuller B, Head RN, Harris RP, Rey C, Hansen BW, Hygum BH, Heath MR, Durb EG

Journal
ICES Journal of Marine Science

Volume
57

Pagination
1752-1763

ISBN Number

Keywords

Calanus, copepods, sex ratio, mesocosm, Espegrend, Bergen, Norway, 18.5 m3

Abstract
The effect of food concentration on the sex ratio in Calanus spp. has been investigatedin laboratory and mesocosm experiments. The results of the experiments are comparedwith time series in the field and with physiological rates. The food concentration andquality had an effect on the sex ratio of adult Calanus, with higher percentages of malesobtained with increased food concentration. Laboratory experiments and field timeseries suggest that sex can still change at stage CIII–CIV, but is determined at stageCV. The energy budget of males was very unbalanced, suggesting that the shorterlifespan often reported could be due to exhaustion of lipid stores.

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Importance of food quantity to structural growth rate and neutral lipid reserves accumulated in Calanus finmarchicus

Title
Importance of food quantity to structural growth rate and neutral lipid reserves accumulated in Calanus finmarchicus
Publication Type
Journal Article
Year of Publication
2000
Authors

Hygum BH, Rey C, Hansen BW, Tande K

Journal
Marine Biology
Volume
136
Pagination
1057-1073
ISBN Number
Keywords

mesocosm, Bergen, Espergend, Norway, 18 m3, nutrient addition, copepods, lipids

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Rearing cohorts of Calanus finmarchicus (Gunnerus) in mesocosms

Title
Rearing cohorts of Calanus finmarchicus (Gunnerus) in mesocosms

Publication Type
Journal Article

Year of Publication
2000

Authors

Hygum BH, Rey C, Hansen BW, Carlotti F

Journal
ICES Journal of Marine Science

Volume
57

Pagination
1740-1751

ISBN Number

Keywords

carbon, Calanus, cohort, development, lipid, mesocosm, Espegrend, Bergen, Norway, 18.5 m3

Abstract
Cohort development and nutritional conditions of Calanus finmarchicus were studiedin experimental seawater mesocosms in a Norwegian fjord. Artificially added cohortsdeveloped from early naupliar stages to copepodite stage IV in 41–43 days at ambienttemperature increasing from 4.3 to 6.8 C. A natural stock of C. finmarchicus, initiallydominated by early copepodite stages, developed to CV, males and females. Totalstorage lipid increased exponentially until CV. Individual body carbon weightincreased sigmoidally with age. Relationship of body carbon weight (W, g) toprosome length (L, m) determined for copepodites and adults (W=2.6 10 10 L3.45,r2=0.92) showed a higher weight than from in situ studies. This investigationdemonstrates (i) that cohorts of C. finmarchicus can be reared successfully inmesocosms, (ii) a good nutritional state of copepods in terms of body carbon contentand lipid reserves, and (iii) that part of the final CV moulted to both males andfemales.

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Growth and development rates of Calanus finmarchicus nauplii during a diatom spring bloom

Title
Growth and development rates of Calanus finmarchicus nauplii during a diatom spring bloom
Publication Type
Journal Article
Year of Publication
2000
Authors

Hygum BH, Rey C, Hansen BW

Journal
Marine Biology
Volume
136
Pagination
1075-1085
ISBN Number
Keywords

mesocosm, Bergen, Espergend, 18 m3, nutrient addition, copepods, Norway

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