Further studies of a spring phytoplankton bloom in an enclosed experimental ecosystem

Morris, Robert J.; McCartney, M.; Joint, Ian; Robinson, Georgina

doi:10.1016/0022-0981(85)90028-0

Cited by 44 publications

(36 citation statements)

References 25 publications

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“…Chl a and fecundity are often reported as being poorly correlated. In this respect it is notable that particulate fatty acid levels at Stn L4 peaked 1 wk after the chl a maximum and that similar observations have been reported previously (Morris 1984, Morris et al 1985, Parnsh 1987, Mayzaud et al 1989. This may at least partly explain the apparent uncoupling of chl a and fecundity.…”

Section: Fecunditysupporting

confidence: 87%

Environmental and nutritional factors determining seasonal variability in the fecundity and egg viability of Calanus helgolandicus in coastal waters off Plymouth, UK

Pond¹,

Harris²,

Head³

et al. 1996

Mar. Ecol. Prog. Ser.

199

180

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Fecundity of the copepod Calanus helgolandicus was monitored at a coastal station in the western English Channel during January to September 1994 and varied seasonally from 3 to 33 eggs female-' d-l (mean 17 eggs female-' d-'). Particulate fatty acid levels, particularly in the <20 pm size fraction, were more highly correlated with fecundity than either chl a, particulate carbon or nitrogen. and this reflected the size and species composition of the microplankton. Diatoms, dinoflagellates and ciliates all sustained high fecundity. The mean volume of eggs produced by C. helgolandicus was inversely related to both food availability and fecundity, with increased numbers of smaller eggs produced during per~ods of high food availability. Female C helgolandicus with the highest body nitrogen and carbon produced eggs with the highest carbon and nltrogen contents, although these eggs were also smaller. Hatching viability was consistently high with a seasonal mean of 83% and both viability and the incidence of deformed nauplii were negatively correlated with the carbon and nitrogen content of females and eggs. Hatching viability was not correlated with the abundance of diatoms, but was closely correlated with the levels of 18:2(n-6) and 20:4(n-6) fatty acids in both the environment and in the eggs. Particulate concentrations of the polyunsaturated fatty acids 20:5(n-3) and 22:6(n-3), although abundant in the environment and therefore good indicators of food availability, were not correlated with either egg viability or naupliar survival. The levels of saturated and monounsaturated fatty acids in the eggs were important factors determining naupliar survival under starvation conditions. Although food availability limited fecundity, female recruitment was possibly limited by predation pressure. particularly during the late summer. This study highlights the value of seasonal and nutritional based studies in understanding variability in zooplankton fecundity.

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Section: Fecunditysupporting

confidence: 87%

Environmental and nutritional factors determining seasonal variability in the fecundity and egg viability of Calanus helgolandicus in coastal waters off Plymouth, UK

Pond¹,

Harris²,

Head³

et al. 1996

Mar. Ecol. Prog. Ser.

199

180

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show abstract

“…Actually, the C18:l proportion never exceeds 6% and the C16:l/C18:1 ratio is not lower than 4 in diatoms at the end of the exponential growth phase (Volkman et al 1989, Dunstan et al 1994). On the contrary, the C16POLY/C18POLY and C16: 1/C18:1 ratio ranges obtained for the Group 2 aggregates are in good agreement with those observed during the midexponential growth phase of Chaetoceros calcitrans and Phaeodactylum tricornuturn cultures (FernandezReiriz et al 1989) as well as during the progressive increase of diatom populations in mixed phytoplankton communities (Kattner et al 1983, Morris et al 1985, hdayzaud et al 1989.…”

Section: Discussionsupporting

confidence: 72%

“…The compositions Mayzaud et al 1989) or in in situ experimental large of samples A2 and A3 were similar to Group 3, with bags (Morris et al 1985, Mayzaud et al 1990), the fatty the difference being that the C16POLY/C18POLY acid proportions were similar to those measured in lab-(0.00 to 0.04) and UNS/SAT (0.30 to 0.41) ratios oratory cultures, but with lower absolute contents. were much lower than in diatom dominated aggreApproximately the same composition was also obgates.…”

Section: Discussionmentioning

confidence: 52%

“…The fatty actd composition can be used as a chemotaxonomic marker for phytoplankton species, taking into account that it also depends upon their growing conditions and growth phase (Kattner et al 1983, Morris et al 1985, Mayzaud et al 1989, Volkman et al 1989, Dunstan et al 1994. Thus, it is essential to develop a method to separate the contribution of different species from effects due to pro- classes (Volkman et al 1989, Dunstan A9 et al 1994.…”

Section: Discussionmentioning

confidence: 99%

“…This was particularly indicated by the minimal C16:1/C18:1 and C16POLY/Cl8POLY ratios (significantly lower than 1) and relatively low C16:1/C16:0 value ranges compared with the other groups (Table 4). Moreover, according to Morris et al (1985) nanoflagellates might also significantly contribute to the increase of the C18POLY and C18:l proportion levels.…”

Section: Discussionmentioning

confidence: 99%

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Fatty acid composition in amorphous aggregates in the northern Adriatic Sea

Najdek¹

1996

Mar. Ecol. Prog. Ser.

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ABSTRACT. The fatty acid compositions of amorphous aggregates were determined in samples collected in northern Adndtic regions of different eutrophicat~on degree and in different seasonal condltions of the plankton communities. It was shown that healthy and active phytoplankton can be present In the aggregate communities, particularly various diatom specles Four different groups of aggregates were sorted by cluster analysis, comparing fatty acid proportions and ratios (C16:1/C16:0, C16:1/C18:1 and C16POLY/C18POLY). The growth stages of the aggregate diatom populations included the lag, exponential and stationary growth phases as well as decay phases. The aggregate diatom composition of several samples was significantly different from the surrounding water. The results confirmed a previous hypothesis that the northern Adriatic aggregates represent self sustaining communities developing throughout the summer.

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Further studies of short-term variation in the pigment composition of a spring phytoplankton bloom

Ridout

Morris

1988

Marine Biology

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Further studies of a spring phytoplankton bloom in an enclosed experimental ecosystem

Cited by 44 publications

References 25 publications

Environmental and nutritional factors determining seasonal variability in the fecundity and egg viability of Calanus helgolandicus in coastal waters off Plymouth, UK

Environmental and nutritional factors determining seasonal variability in the fecundity and egg viability of Calanus helgolandicus in coastal waters off Plymouth, UK

Fatty acid composition in amorphous aggregates in the northern Adriatic Sea

Further studies of short-term variation in the pigment composition of a spring phytoplankton bloom

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