The estimation of production and mortality of Bosmina longirostris (O. F. Müller) in the River Danube (Danubialia Hungarica, CIX)

Bothár, Anna

doi:10.1007/978-94-009-4039-0_31

Cited by 5 publications

(2 citation statements)

References 5 publications

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“…Schulz & Sterner (1999) showed a similar trend in Bosmina (leideri) for early growth stages (to day 7). Bothar (1986Bothar ( , 1987 also reported a high growth rate of riverine Bosmina (River Danube, Hungary). The mean brood size in our Scenedesmus treatment was similar to that of the phosphorus rich, high quantity treatment of Schulz & Sterner (1999) and the 0.25 mg C L )1 treatment of Urabe (1991); however Urabe had slightly higher mean brood size (approximately nine versus six per clutch) at 2.5 mg C L )1 .…”

Section: Discussionmentioning

confidence: 96%

Dietary effects on life history traits of riverine Bosmina

2005

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1. We compared growth, reproduction and life history characteristics of Bosmina raised on Ohio River seston versus a unialgal culture (Scenedesmus acutus), to assess potential nutritional constraints experienced by riverine populations. 2. Bosmina grew well in both treatments during their juvenile stage. Analysis of variance showed that Bosmina growth prior to the start of reproduction did not differ significantly between the treatments. After the onset of reproduction Bosmina fed on Scenedesmus grew faster and exhibited higher fecundity than their counterparts fed river seston. 3. Significant quantities of triacylglycerol (visible lipid droplets) were gradually accumulated in Bosmina fed on Scenedesmus. Visual lipid ovary indices were positively correlated with adult growth rate and fecundity and negatively correlated with longevity. 4. Biochemical analysis showed that Scenedesmus had significantly greater total x3, x6 and polyunsaturated fatty acids (PUFA) whereas river seston had more eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). Thus, in contrast to Daphnia, EPA and DHA do not appear to influence Bosmina growth or reproductive performance, but linolenic acid or total PUFA may be important. 5. Comparatively weak performance by Bosmina feeding on river seston suggest that nutritional constraints may be important despite high particulate organic carbon and low C : N and C : P of river seston.

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Section: Discussionmentioning

confidence: 96%

Dietary effects on life history traits of riverine Bosmina

2005

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“…Compared to lakes, lotic ecosystems typically support zooplankton biomass less than would be expected based on the density of phytoplankton (Pace et al, 1992). For example, studies performed in the Danube (Bothar, 1987), the Hudson , the Hawkesbury-Nepean (Kobayashi et al, 1996), the Rideau (Basu & Pick, 1997) or the Meuse (Servais et al, 2000) rivers have demonstrated that zooplankton grazing has little impact on phytoplankton structure. The evidence from lotic ecosystems from South America is not abundant.…”

Section: The Third Mechanism: Grazing Effects Of Zooplankton On Phyto...mentioning

confidence: 99%

Grazing impacts on phytoplankton in South American water ecosystems: a synthesis

Frau

2021

Hydrobiologia

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The role of grazing as a controlling factor of phytoplankton has an extensive debate in the literature. In this article, five mechanisms that have been explored as potential controlling factors of grazing influence on phytoplankton in South America are discussed and compared with other latitudinal works. The temperature impact on zooplankton is not conclusive, with planktivorous fish appearing as the main controlling factor of zooplankton size ranges. Fish grazing effects on phytoplankton look despicable, but the impact of exotic filter-feeding fish remains controversial. Microphagous rotifers and Copepoda nauplii affect phytoplankton by selective size grazing, while large Cladocera and Copepoda adults can control phytoplankton when they reach high densities in the absence of fish. Both groups mainly feed on small sizes, with microzooplankton having a higher impact on very small phytoplankton. Some contradictory evidence arises for large colonial and filamentous algae. Exotic invasive filter-feeding bivalves are selective grazers in experimental approximations. Corbicula fluminea feeds on smaller particles, does not have taxonomic preferences, and has lower densities in nature than Limnoperna fortunei. Their effect on nature is not fully documented. In sum, several aspects still need deep scrutiny to fully understand the role of grazing on phytoplankton in South America.

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Phytoplankton and zooplankton (Cladocera, Copepoda) relationship in the eutrophicated River Danube (Danubialia Hungarica, CXI)

Bothár

Kiss

1990

Hydrobiologia

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The seasonal variation in primary production, individual numbers, and biomass of phyto-and zooplankton was studied in the River Danube in 1981 . The secondary production of two dominant zooplankton species (Bosmina longirostris and Acanthocyclops robustus) was also estimated . In the growing season (April-Sept .) individual numbers dry weights and chlorophyll a contents of phytoplankton ranged between 30-90 x 10 6 individuals, l -', 3-12 mg 1 -', and 50-170µg 1 -1 , respectively . Species of Thalassiosiraceae (Bacillariophyta) dominated in the phytoplankton with a subdominance of Chlorococcales in summer . Individual numbers and dry weights of crustacean zooplankton ranged between 1400-6500 individuals M-3 , and 1.2-12 mg m-3, respectively . The daily mean gross primary production was 970 mg C m-3 d -1 , and the net production was 660 mg C m-3 d -' . Acanthocyclops robustus populations produced 0 .2 mg C m-3 d -1 as an average, and Bosmina longirostris populations 0 .07 mg C m-3 d -'. The `ecological efficiency' between phytoplankton and crustacean zooplankton was 0 .03 % . M J J J A J A S S ----Bosmina longirostris

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The estimation of production and mortality of Bosmina longirostris (O. F. Müller) in the River Danube (Danubialia Hungarica, CIX)

Cited by 5 publications

References 5 publications

Dietary effects on life history traits of riverine Bosmina

Dietary effects on life history traits of riverine Bosmina

Grazing impacts on phytoplankton in South American water ecosystems: a synthesis

Phytoplankton and zooplankton (Cladocera, Copepoda) relationship in the eutrophicated River Danube (Danubialia Hungarica, CXI)

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