Initiation of the midsummer decline of Daphnia as related to predation, non-consumptive mortality and recruitment: a balance

Wagner, Annekatrin; Hülsmann, Stephan; Dörner, Hendrik; Janssen, Maren; Kahl, Uwe; Mehner, Thomas; Benndorf, Jürgen

doi:10.1127/0003-9136/2004/0160-0001

Cited by 42 publications

(72 citation statements)

References 51 publications

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“…Accordingly, predators (especially pikeperch) had massively enhanced reproduction. Young-of-year pike-perch (and perch) selectively preyed upon Daphnia and became an important factor, substantially contributing to the summer decline in some years (Mehner et al 1998, Benndorf et al 2001, Wagner et al 2004. Moreover, because of low predation by adult planktivores, invertebrate predators such as Leptodora or Chaoborus increased and contributed to the reduction of Daphnia biomass as well (Wagner et al 2005).…”

Section: Discussionmentioning

confidence: 99%

“…Finally, during years with warm spring, Daphnia tended to produce a synchronized spring cohort. Food shortage during the clear water stage faced by a Daphnia cohort producing very few eggs and approaching the end of its life-span might have been another source of massive mortality (Hülsmann and Weiler 2000, Benndorf et al 2001, Hülsmann 2003, Wagner et al 2004.…”

Section: Discussionmentioning

confidence: 99%

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Reduction of nutrient loading and biomanipulation as tools in water quality management: Long-term observations on Bautzen Reservoir and Feldberger Haussee (Germany)

Kasprzak

Benndorf

Gonsiorczyk

et al. 2007

Lake and Reservoir Management

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Reduction of nutrient loading and biomanipulation as tools in water quality management: Long-term observations on Bautzen Reservoir and Feldberger Haussee (Germany)

Kasprzak

Benndorf

Gonsiorczyk

et al. 2007

Lake and Reservoir Management

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“…2). Hence, it may be concluded that it is not predation or resource supply that shape the zooplankton spring dynamics but rather a matter of when and how much, that is, a matter of timing and magnitude (Gliwicz 2002;Hansson et al 2004;Wagner et al 2004). Moreover, since the timing of predation rates on different size classes of zooplankton from both adult and 0+ fish are very subtle, occurring on a temporal scale of days, even a minor change in spring mean temperatures may have considerable effects on the zooplankton size and community composition.…”

Section: Discussionmentioning

confidence: 99%

“…5). This may be a result of the accelerating predation pressure from both adult and 0+ fish, of resource depletion, or of a combination of both bottom-up and topdown processes (Gliwicz 2002;Wagner et al 2004).…”

Section: Discussionmentioning

confidence: 99%

Consequences of fish predation, migration, and juvenile ontogeny on zooplankton spring dynamics

Hansson

Nicolle

Brodersen

et al. 2007

Limnology & Oceanography

123

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In order to disentangle if and when resource supply and adult and young-of-the-year (0+) fish predation affect zooplankton dynamics during spring, we monitored zooplankton during three consecutive years in a lake in southern Sweden. We also experimentally assessed 0+ fish predation rates and estimated changes in predation rates of adult fish on zooplankton. Decline in abundances of large-sized zooplankters in early spring was not caused by 0+ fish predation. Instead, this decline was most likely a combined result of size-selective predation from adult fish (stationary in the lake and from those returning from surrounding streams) and competition for diminishing algal food resources. On the other hand, the decline in medium-sized zooplankton in the lake during spring was strongly affected by 0+ fish. Hence, during spring, zooplankton are facing predation both from adult fish selecting large prey and from 0+ fish, which start feeding on small-sized prey and eventually switch to larger. Neither predation by different ontogenetic stages of fish (adult and 0+) nor resource supply shape the zooplankton spring dynamics, but rather they affect the timing and strength of these events. 0+ cyprinids tend to have stronger effect on zooplankton dynamics than other taxa of 0+ fish. A combination of predation from adult and 0+ fish during spring is the main mechanism behind the crash of the zooplankton community, which in many lakes leads to the termination of the clear-water phase.The spring, with its rapidly increasing temperature, is an important period for the development of the zooplankton summer community in temperate regions, mirrored in dramatic fluctuations in population densities. These conspicuous spring fluctuations are due to changes in reproductive rates and resource supply but also to increased feeding rates from predators. The total predation rate on zooplankton may be divided into several components. First, there is predation from adult fish present in the lake year-round, and the seasonal fluctuations in their predation rate is driven by temperature (Lessmark 1983) and is generally most intense on larger zooplankton size classes (Brooks and Dodson 1965). Second, a dramatic change in the predation rate occurs with the hatching and recruitment of young-of-the-year fish (0+) in the spring. They start their life by feeding on small zooplankton but are within a few weeks able to feed on larger size classes (Mills and Forney 1983;Mehner and Thiel 1999). Thus, smaller size classes of zooplankton should suffer from 0+ predation earlier in the season than larger ones. It has previously been suggested that 0+ predation drives succession in the zooplankton community (Cryer et al. 1986;Gliwicz and Pijanowska 1989), whereas other studies have concluded that 0+ fish predation probably is too weak to explain zooplankton spring dynamics (Cushing 1983;Boersma et al. 1996) and that instead other processes, such as competition and resource supply (i.e., bottom-up processes) are more important. In a review, Mehner and Th...

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“…The observed patterns of OS variation with maternal traits and environmental factors suggest an adaptive shift from quantity to quality of offspring as food availability per individual decreases. During spring and early summer, Daphnia populations grow rapidly (Hu¨lsmann, 2003;Wagner et al, 2004), resulting in a depletion of available resources. At the end of the spring algal bloom, newborn daphniids have few available resources, exerting high physiological stress on individuals, which results in an elevated non-consumptive mortality (Hu¨lsmann, 2003).…”

Section: Adaptive Valuementioning

confidence: 99%

How do interactive maternal traits and environmental factors determine offspring size inDaphnia magna?

Gabsi

Glazier

Hammers‐Wirtz³

et al. 2014

Ann. Limnol. - Int. J. Lim.

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-In this study, we investigated variation in offspring size (OS) of Daphnia magna in relation to multiple maternal traits and environmental variables. Data originated from laboratory experiments conducted at different feeding scenarios. The mother daphnids had different life-history traits and were reared under various feeding and density conditions. OS showed linear relationships with maternal traits, varying positively with maternal body size, age and brood number, and negatively with brood size and with the amount of ingested carbon. OS increased exponentially with crowding. Using stepwise multiple regression analysis, we developed an empirical model for the OS variation with the relevant maternal and environmental variables. Density dependence was considered by multiplying the resulting model by a density-effect function. We found that the ingested carbon and the maternal body size were the strongest determinants of the observed variation in the OS, whereas the brood size had the least impact on OS. Additionally, the brood number had no significant effect in determining the variability in the OS. The validity of the multivariate model was tested against an independent dataset. The model accurately predicted the OS despite several genetic and environmental differences compared with the data used for parameterization.

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Initiation of the midsummer decline of Daphnia as related to predation, non-consumptive mortality and recruitment: a balance

Cited by 42 publications

References 51 publications

Reduction of nutrient loading and biomanipulation as tools in water quality management: Long-term observations on Bautzen Reservoir and Feldberger Haussee (Germany)

Reduction of nutrient loading and biomanipulation as tools in water quality management: Long-term observations on Bautzen Reservoir and Feldberger Haussee (Germany)

Consequences of fish predation, migration, and juvenile ontogeny on zooplankton spring dynamics

How do interactive maternal traits and environmental factors determine offspring size inDaphnia magna?

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