Trophic Interactions and Production Processes in Natural Zooplankton Communities in Enclosed Water Columns

Harris, Roger P.; Reeve, M. R.; Grice, George D.; Evans, Geoffrey T.; Gibson, Victoria R.; Beers, John R.; Sullivan, Barbara K.

doi:10.1007/978-1-4612-5645-8_27

Cited by 27 publications

(23 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…population growth rates were low, and our experiment did not last long enough to allow full ctenophore impact to develop. Hirota (1974) (Harris et al 1982), heavy population predation impact by P. pileus did not begin until 25 d into a 40 d experiment, after several cohorts of ctenophore reproduction.…”

Section: Discussionmentioning

confidence: 99%

Top-down regulation in ctenophore-copepod-ciliate-diatom-phytoflagellate communities in coastal waters: a mesocosm study

Granéli¹,

Turner²

2002

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

Interactions between the ctenophore Pleurobrachia pileus, copepods, ciliates and phytoplankton in a late spring natural plankton community were studied experimentally using mesocosms consisting of 300 l polyethene cylinders. Mesocosms were filled with 90 µm filtered nutrient-enriched seawater from Gullmar Fjord on the Swedish Skagerrak coast. Mesozooplankton (primarily copepods and marine cladocerans) or ctenophores were added, either alone or in combination, to examine topdown predation and grazing effects on phytoplankton abundance and composition. Predation impact of ctenophores on copepods appeared to be minimal in that it did not significantly decrease the biomass of the copepods until the last day of the experiment. However, in the presence of ctenophores, ciliates increased compared to controls both with and without added zooplankton, suggesting that ctenophore predation on copepods reduced copepod predation on ciliates. In the absence of ctenophores, ciliates declined precipitously, presumably due to copepod predation. This was particularly severe in treatments with zooplankton added at 10 × the natural abundance but without ctenophores. Copepods heavily grazed on the diatom Skeletonema costatum, and most phytoflagellates increased in mesocosms with copepod additions, suggesting that they were not substantially grazed by copepods. However, copepods did graze to some extent on larger dinoflagellates of the genus Gymnodinium/Karenia. Ciliates were important phytoplankton grazers, especially of phytoflagellates and picoplankton. It appears that the primary top-down effect of ctenophore predation on copepods was to reduce copepod predation on ciliates, thereby increasing ciliate grazing on the small flagellates that dominated the phytoplankton.

show abstract

Section: Discussionmentioning

confidence: 99%

Top-down regulation in ctenophore-copepod-ciliate-diatom-phytoflagellate communities in coastal waters: a mesocosm study

Granéli¹,

Turner²

2002

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

show abstract

“…In spite of a well developed cycle of species succession, year-to-year fluctuation in biomass levels and timing of appearance are much more predictable than in the majority of the protists. Because of their long response.time metazooplankton are less susceptible to vagaries of the weather; further, the reproductive success of small herbivorous copepods is independent of the composition of its food (Harris et al 1982). The Kiel Bight observations show that ctenophore predators, often observed to regulate copepod populations in shallow enclosed seas (Greve 1981;Harris et al 1982), are also not necessarily of importance.…”

Section: Discussionmentioning

confidence: 99%

“…Because of their long response.time metazooplankton are less susceptible to vagaries of the weather; further, the reproductive success of small herbivorous copepods is independent of the composition of its food (Harris et al 1982). The Kiel Bight observations show that ctenophore predators, often observed to regulate copepod populations in shallow enclosed seas (Greve 1981;Harris et al 1982), are also not necessarily of importance. Rather, it appears that internal control such as predation ofnauplii by adult copepods or some unknown intrinsic features of the life cycle are more important in regulating their biomass than environmental factors such as food availability or predation pressure--of course within certain limits.…”

Section: Discussionmentioning

confidence: 99%

The Annual Cycle of Kiel Bight Plankton: A Long-Term Analysis

Smetacek

1985

Estuaries

View full text Add to dashboard Cite

ABSTRA("i: (}~el the past decade, the annual cycle of the major pelagic processes in relation io environ,uenial taciuis and species composition of the plankton has been studied intensively a! a fixed station in Kid Bight. A series of sequential phases, differentiated according to characteristic properties, succeed each other in a recurring pattern each year. The following phases have been differentiated: the spring diatom bloom, the late spring copepod maximum, the summer stratification, the fall blooms and the winter dormancy. Each phase represents a particular pattern of biogenous element cycli~tg, both wilhin the pelagic system and between the pelagic and benthic systems. Each phase is also ch:trat:le~ized by a spectrum of dominant species, many of which do not recur each year. Greatest variatio,, is found amongst bloom diatoms, whereas large, slow-growing species such as the Ceratia and m(~t meta~ot~plankton are highly recurrent. Variation in species composition is not related to I~,g term tremlr~ since the past century, in spite of the considerable increase in anthropogeoic nutrieiit input to the Bight. Short..term events appear to determine occurrence of fast-growing species, luany of which have benthic resting stages in their life histories. It is concluded that more atientioit sllould be paid to life history strategies of species if the mechanisms of seasonal succession are to be elucidated. Long-term observations on appearance or absence of the various species in relation to euvir6nrneotal properties can provide clues as to the nature of these life history strategies. l,llri~ditt.tioiJThe history o[ quaniilatr~,e plankton research goes back a c~;litltry tfJ Hensen's (1887) pionec, iug .,;tudy of plankton standing stock and pruductioii conducted in Kiel Bight (Bay is a synon~qn) liom i 882 to 1885. His intention was to dcv~lo0 a standardized methodology ti~, cslimating the potential food supply of lish iiJ lhe see iii order to establish a scieniitic basis for fisheries regulation. SiIlC(: lheri, illllnerom; investigations have been t;an-icd ~>l~l i~' Ihc Bight that can be grouped into pcliods ac

show abstract

“…Weights of the different copepodid stages were obtained from measurements on late copepodids and adults collected in Linddspollene (Yen unpubl.) and from measurements published by Harris et al (1982) and Klein Breteler et al (1982). The weights of the individual stages were in the range 1 to 27 pg ash-free dry weight for the different species.…”

mentioning

confidence: 99%

A population dynamics approach to the estimation of production of four calanoid copepods in Lindaspollene, western Norway

Aksnes¹,

Magnesen²

1988

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

Estimates were made of copepod production, based on estimates of recruitment, mortality. development times and individual weight data, and the methodological approach given earlier by Sonntag & Parslow is further developed. In addition to estimates of cohort production, the present approach includes estimation of daily production in depth and time. The estimation method is applied to abundance data of the copepodids of Pseudocalanus elongatus, Paracalanus parvus, Temora longicornis and Centropages hamatus obtained in LindAspollene in 1981. Production during June was estimated as 446, 252, 231 and 63 mg ash-free dry weight m-' respectively. Production of P. parvus and C. hamatus was primarily concentrated in the upper 5 m, while that of T. longicornis and P. elongatus was located below 5 m depth. The cohort P/B ratios were estimated in the range 2.5 to 6.8. The daily P/B ratios (including data for Calanus finmarchicus) were strongly dependent on the stage of development within the populations, but did not seem to differ much between species.

show abstract

Trophic Interactions and Production Processes in Natural Zooplankton Communities in Enclosed Water Columns

Cited by 27 publications

References 22 publications

Top-down regulation in ctenophore-copepod-ciliate-diatom-phytoflagellate communities in coastal waters: a mesocosm study

Top-down regulation in ctenophore-copepod-ciliate-diatom-phytoflagellate communities in coastal waters: a mesocosm study

The Annual Cycle of Kiel Bight Plankton: A Long-Term Analysis

A population dynamics approach to the estimation of production of four calanoid copepods in Lindaspollene, western Norway

Contact Info

Product

Resources

About