Size and phytoplankton selection by oosterschelde zooplankton

Tackx, M.; Bakker, C.; Francke, J.W.; Vink, Markus

doi:10.1016/0077-7579(89)90041-0

Cited by 46 publications

(32 citation statements)

References 23 publications

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“…This study reveals that rotifers, cladocerans and copepods had a spatial distribution quite different from that of the cyanobacteria. This probably resulted from their respective feeding behavior because it is well known that each species differed in their selective feeding patterns depending on prey size (Tackx et al 1989, Pagano et al 1999). In addition, neurotoxic blooms of Cylindrospermopsis raciborskii were recently reported in some water supply reservoirs , Nascimento et al 2000 and can affect feeding, growth and reproduction of many zooplankters (Smith & Gilbert 1995).…”

Section: Biological Contextmentioning

confidence: 99%

Occurrence of Cylindrospermopsis (Cyanobacteria) in 39 Brazilian tropical reservoirs during the 1998 drought

Bouvy¹,

Falcão²,

Marinho³

et al. 2000

Aquat. Microb. Ecol.

236

139

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ABSTRACT:The relationship between the trophic state of 39 reservoirs located in the semi-arid region of north-east Brazil and their planktonic structure was examined by a sampling survey during the 1998 drought (September to November). A total of 30 environmental and biological parameters, with special attention paid to phytoplankton, were studied once at each reservoir to obtain a synoptic view at a state scale (Pernambuco State). The application of the chlorophyll a-total phosphorus standard relationship for grades of eutrophication revealed a classification in which 90% of the sites were eutrophic-hypertrophic. Among the 202 taxa identified in the phytoplankton assemblages, the cyanobacterium Cylindrospermopsis (Wolsz.) Seenayya et Subba Raju represented more than 80% of the total phytoplankton density in 10 reservoirs and more than 50% in 17 reservoirs. The rarity of other phytoplanktonic groups in the case of the Cylindrospermopsis dominance is the most significant biological feature of these reservoirs. Although rotifers were more closely linked to hypereutrophic conditions than copepods or cladocerans, this dominant group did not seem to play an efficient role in cyanobacterial control. A statistical approach based on the analysis of cross tables (co-inertia analysis) allows us to describe species-environment relationships with a special focus on the factors governing the presence of Cylindrospermopsis. As determined by hierarchical analysis, a major group of studied reservoirs (70%) corresponded to deeper, warmer and hypertrophic reservoirs characterized by the combination of (1) low ammonia concentration, high temperature and pH values, and (2) high percentages of Cylindrospermopsis abundances. Lack of water renewal in 1998 linked to the 1997 El Niño consequences seems to be a major determinant for both trophic conditions and Cylindrospermopsis dominance in the reservoirs studied.KEY WORDS: Bacteria · Phytoplankton · Zooplankton · Cylindrospermopsis · El Niño event · Reservoirs · Co-inertia analysis Resale or republication not permitted without written consent of the publisherAquat Microb Ecol 23: [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] 2000 Cyanobacteria are recognized as a critical problem worldwide and their blooms are typical phenomena in eutrophic lakes, often linked to external nutrient enrichment (Paerl 1988). The influence of local climatological factors (e.g. wind, light intensity, temperature) can accelerate these phenomena and modify the phytoplankton structure, as cyanobacteria are strongly driven by physical factors such as local weather conditions (e.g. Tóth & Padisák 1986, Fabbro & Duivenvoorden 1996. Other factors that potentially influence the biomass and composition of phytoplankton include a stable water column with a turbulence limitation defined as a high ratio between the mixing zone and the euphotic zone (Soranno 1997). In addition, cyanobacteria are inedible prey for many zooplankton organisms because of their large colony size, their toxic effects and low...

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Section: Biological Contextmentioning

confidence: 99%

Occurrence of Cylindrospermopsis (Cyanobacteria) in 39 Brazilian tropical reservoirs during the 1998 drought

Bouvy¹,

Falcão²,

Marinho³

et al. 2000

Aquat. Microb. Ecol.

236

139

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“…longicornis is known to be a selective (Koski et al 2005) and omnivorous grazer feeding on phytoplankton and microzooplankton (Kleppel et al 1991;Kleppel 1993;Gentsch et al 2009) of a wide size range in natural assemblages (O'Connors et al 1980;Tackx et al 1989Tackx et al , 1990. Furthermore, field populations of T. longicornis can have a substantial grazing impact on phytoplankton (Dam and Peterson 1993).…”

Section: Microzooplankton and T Longicornis Grazing Impact On The Phmentioning

confidence: 99%

The role of ciliates, heterotrophic dinoflagellates and copepods in structuring spring plankton communities at Helgoland Roads, North Sea

et al. 2011

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Mesocosm experiments coupled with dilution grazing experiments were carried out during the phytoplankton spring bloom 2009. The interactions between phytoplankton, microzooplankton and copepods were investigated using natural plankton communities obtained from Helgoland Roads (54°11.3 0 N; 7°54.0 0 E), North Sea. In the absence of mesozooplankton grazers, the microzooplankton rapidly responded to different prey availabilities; this was most pronounced for ciliates such as strombidiids and strobilids. The occurrence of ciliates was strongly dependent on specific prey and abrupt losses in their relative importance with the disappearance of their prey were observed. Thecate and athecate dinoflagellates had a broader food spectrum and slower reaction times compared with ciliates. In general, high microzooplankton potential grazing impacts with an average consumption of 120% of the phytoplankton production (P p ) were measured. Thus, the decline in phytoplankton biomass could be mainly attributed to an intense grazing by microzooplankton. Copepods were less important phytoplankton grazers consuming on average only 47% of P p . Microzooplankton in turn contributed a substantial part to the copepods' diets especially with decreasing quality of phytoplankton food due to nutrient limitation over the course of the bloom. Copepod grazing rates exceeded microzooplankton growth, suggesting their strong top-down control potential on microzooplankton in the field.Selective grazing by microzooplankton was an important factor for stabilising a bloom of less-preferred diatom species in our mesocosms with specific species (Thalassiosira spp., Rhizosolenia spp. and Chaetoceros spp.) dominating the bloom. This study demonstrates the importance of microzooplankton grazers for structuring and controlling phytoplankton spring blooms in temperate waters and the important role of copepods as top-down regulators of microzooplankton.

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“…O'Connors et al 1980, Price et al 1983, Tackx et al 1989 or species (Gill and Harris 1987), different phytoplankton assemblages are likely to have different influences on the structure of the pelagic food web. In the present study, the intimation is that small microflagellates appear to be generally unavailable as direct food for mesoplankton.…”

Section: Zooplanktonmentioning

confidence: 99%

Relationships between hydrography, phytoplankton production, biomass, cell size and species composition, and copepod production in the southern Benguela upwelling system in April 1988

Walker¹,

Peterson²

1991

South African Journal of Marine Science

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Size and phytoplankton selection by oosterschelde zooplankton

Cited by 46 publications

References 23 publications

Occurrence of Cylindrospermopsis (Cyanobacteria) in 39 Brazilian tropical reservoirs during the 1998 drought

Occurrence of Cylindrospermopsis (Cyanobacteria) in 39 Brazilian tropical reservoirs during the 1998 drought

The role of ciliates, heterotrophic dinoflagellates and copepods in structuring spring plankton communities at Helgoland Roads, North Sea

Relationships between hydrography, phytoplankton production, biomass, cell size and species composition, and copepod production in the southern Benguela upwelling system in April 1988

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