Impact of water regime and fish predation on zooplankton resting egg production and emergence

Nielsen, Daryl L.; Smith, F.; Hillman, Terry J.; Shiel, Russell J.

doi:10.1093/plankt/22.3.433

Cited by 44 publications

(43 citation statements)

References 19 publications

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“…Under unfavourable conditions, males are produced parthenogenetically and then sexual females produce haploid eggs that are fertilized by these males, resulting in 'resting eggs' that are able to withstand extreme situations and that hatch upon the resumption of favourable conditions. The switch to sexual reproduction appears to be related to a deterioration in the environment due to over-crowding, reduced food, a change in temperature and photoperiod (Stross 1971;Korpelainen 1992;Spaak 1995;Deng 1996;Innes & Singleton 2000), or to predation (Nielsen et al 2000;Cousyn et al 2001).…”

Section: Discussionmentioning

confidence: 99%

Population dynamics of Chaoborus flavicans and Daphnia spp.: effects on a zooplankton community in a volcanic eutrophic lake with naturally high metal concentrations (L. Monticchio Grande, Southern Italy)

Leoni¹,

Garibaldi²

2009

J Limnol

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Section: Discussionmentioning

confidence: 99%

Population dynamics of Chaoborus flavicans and Daphnia spp.: effects on a zooplankton community in a volcanic eutrophic lake with naturally high metal concentrations (L. Monticchio Grande, Southern Italy)

Leoni¹,

Garibaldi²

2009

J Limnol

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“…For example, a great number and diversity of rotifers hatch from flooded dried sediments of floodplains and experimental and natural billabongs (Boulton and Lloyd 1992;Nielsen et al 2000;Langley et al 2001;Schröder 2001). Also, the transfer of dried sediment to culture medium in the laboratory usually leads to the emergence of hatched rotifers from fertilized eggs (Gilbert 2001, unpubl.…”

Section: Hatching Environments-detailed Laboratory Investigations Of mentioning

confidence: 99%

Rotifers from diapausing, fertilized eggs: Unique features and emergence

Gilbert

Schröder

2004

Limnology & Oceanography

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Sexual reproduction in cyclically parthenogenetic rotifers results in the production of diapausing, fertilized (resting) eggs, which can survive for decades in sediment egg banks. Stem females hatching from these eggs can differ from genetically identical ones produced in subsequent parthenogenetic generations. Differences involve the inhibition of sexual reproduction, which may persist for many parthenogenetic generations; reduced morphology (apterous Polyarthra, shorter-spined Brachionus); and larger stores of lipid. These features of stem females may facilitate colonization by favoring population growth via female parthenogenesis and by decreasing food requirements for survival and reproduction. Fertilized eggs in dried sediments probably hatch soon after being flooded by rising water levels. Eggs in permanently submerged sediments may be in environments that inhibit hatching (e.g., darkness, low water temperature, low dissolved oxygen) and hatch only when brought to the sediment surface or resuspended into the water column by currents or bioturbation. Laboratory experiments show that the hatching of diapausing, fertilized eggs can require light and temperatures suitable for population development or specific changes in temperature consistent with a new growing season. The limited data that exist on their emergence from fertilized eggs in natural systems come from sediment traps, from the occurrence in the water column of apterous Polyarthra or empty egg shells, and from calculations of negative mortality rates of planktonic populations. Fertilized eggs often hatch at the beginning of the growth season but may continue to hatch intermittently thereafter. The extremely high genotypic diversity of some natural rotifer populations indicates extensive hatching of stem females from the sediment egg bank.

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“…Wiggins et al (1982) suggest that emergence of animals from resting eggs is dependent not only on the availability of water but also on receiving the right cues in the right sequence. There was a substantial reservoir of resting zooplankton eggs in the sediments of all the experimental billabongs (Nielsen et al, 2000), which implies that even though water was supplied, the correct environmental cues were not. The lack of response following flooding may have been through delayed emergence of these resting eggs.…”

Section: Seasonality Of Floodingmentioning

confidence: 99%

The influence of seasonality and duration of flooding on zooplankton in experimental billabongs

Nielsen

Hillman

Smith

et al. 2002

River Research & Apps

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The regulation of Australian lowland rivers such as the River Murray has resulted in changes to the flooding characteristics of many associated wetlands. It has been suggested that these changes in flooding have changed the pattern of response of many wetland biota. The substantial variability in the size and shape of these wetlands makes limited field observations difficult to interpret. To overcome this variability 16 experimental billabongs were constructed in which factors that may cause changes to populations within billabongs could be manipulated. In this paper we report on experiments that test the hypothesis that changing the pattern of flooding alters the density and diversity of rotifers and microcrustaceans in billabongs. The experimental billabongs were sampled fortnightly for two years. During this time four flood events were imposed. Flooding of the experimental billabongs resulted in increased microcrustacean abundance. Rotifer abundance rarely increased following flooding. Changing the time of flooding did not modify this response. Observed changes in community structure following flooding result from changes in the relative densities of taxa already present rather than changes in the community composition.

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Impact of water regime and fish predation on zooplankton resting egg production and emergence

Cited by 44 publications

References 19 publications

Population dynamics of Chaoborus flavicans and Daphnia spp.: effects on a zooplankton community in a volcanic eutrophic lake with naturally high metal concentrations (L. Monticchio Grande, Southern Italy)

Population dynamics of Chaoborus flavicans and Daphnia spp.: effects on a zooplankton community in a volcanic eutrophic lake with naturally high metal concentrations (L. Monticchio Grande, Southern Italy)

Rotifers from diapausing, fertilized eggs: Unique features and emergence

The influence of seasonality and duration of flooding on zooplankton in experimental billabongs

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