Resistance of dormant stages of planktonic invertebrates to adverse environmental conditions

Radzikowski, Jacek

doi:10.1093/plankt/fbt032

Cited by 110 publications

(84 citation statements)

References 132 publications

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“…Hatching of Daphnia from ephippial eggs can offer an almost constant supply of new clonal lines since, unlike subitaneous eggs, most of them are formed sexually (Lampert 2011). Daphnia resting eggs are long-lived (Radzikowski 2013) and can thus be hatched after a long storage period. Hence, access to new clonal lines may be possible long after field sampling.…”

Section: Introductionmentioning

confidence: 99%

Different thermal stimuli initiate hatching of Daphnia diapausing eggs originating from lakes and temporary waters

2017

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The simultaneous hatching of Daphnia resting eggs from a number of different lakes and ponds using one set of hatching cues can be difficult to achieve as environmental conditions differ considerably between water bodies. Therefore, optimal hatching conditions for ephippial eggs originating from shallow temporary waters may differ from those found in large lakes. The aim of our study was to compare the optimal thermal conditions for hatching ephippial eggs of Daphnia found in permanent lakes and those from shallow temporary ponds. We used ephippial eggs of Daphnia from the longispina species complex originating from two temporary city ponds and two deep lakes in Poland. The ephippia were protected against overheating at all stages of the field and laboratory work to prevent activation or killing of the eggs. After a refractory period (imposed storage in cool and dark conditions), ephippia were incubated at six different temperatures (6, 9, 12, 15, 18 and 21°C) under a 16:8 L:D light regime. Our results indicate that hatching of resting eggs of Daphnia that inhabit lakes or ponds may require different thermal conditions. The hatching success of ephippial eggs originating from temporary waters was relatively high (30-56%) at all tested incubation temperatures, while for the ephippial eggs from the deep lakes it was lower (7-37%) and inversely related to water temperature. The divergent hatching responses of the ephippial eggs originating from temporary pools and lakes may reflect the typical thermal conditions during hatching in their native habitats. While in the deep lakes of the temperate zone Daphnia hatching typically occurs during the low water temperatures of early spring, in shallow ponds Daphnia hatching may occur throughout the year at varying water temperatures, from a few to over a dozen degrees Celsius.

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Section: Introductionmentioning

confidence: 99%

Different thermal stimuli initiate hatching of Daphnia diapausing eggs originating from lakes and temporary waters

2017

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“…In the light of our results, the extreme longevity of zooplankton dormant forms (Radzikowski, 2013;Frisch et al, 2014) might be seen as an adaptation to long burial with rare opportunities for hatching (when they occasionally reappear at the sediment surface in the appropriate season).…”

Section: Discussionmentioning

confidence: 62%

The effect of lake sediment on the hatching success of Daphnia ephippial eggs

Radzikowski¹,

Sikora²,

Ślusarczyk³

2016

J Limnol

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“…Figuerola & Green, 2002;Altermatt & Ebert, 2008). The eggs encapsulated inside ephippium show high thermal, desiccation, and digestion resistance (reviewed in Radzikowski, 2013), and the structure of ephippium itself makes it both an efficient protective and an adherent floating vessel. The outermost cuticular layer of the flattened ephippial case is densely spotted with microrecesses (Schultz, 1977;Du & Li, 1990;Juračka et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Quantification of floating ephippia in lakes: a step to a better understanding of high dispersal propensity of freshwater plankters

2015

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Planktonic cladocerans of the genus Daphnia are an example of organisms whose ability to disperse among aquatic habitats is limited to dispersal of dormant eggs, encapsulated in protective structures called ephippia. In the present study, we aimed to quantify the production of floating and sinking ephippia in lakes to test the hypothesis that, even if they eventually sink, most of them are first floating at the surface. In addition, we checked the egg content status of the ephippia. The results of this study revealed numbers of ephippia floating at lakes surface reaching thousands per square metre at the time of ephippia production, and constituting substantial share of that production. In studied shallow lowland lakes and in a deep mountain lake, most ephippia were first floating at the water surface, while in deep lowland lakes the proportion was reversed. Approximately half of ephippia that appeared initially at the water surface sank during the six-week sampling period. The egg content status did not differ between floating and sinking ephippia. High numbers of ephippial females staying in the surface layers at night in a mountain lake, and a laboratory experiment with ephippial females indicated that ephippia are actively oviposited to the water surface by gravid females.

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Resistance of dormant stages of planktonic invertebrates to adverse environmental conditions

Cited by 110 publications

References 132 publications

Different thermal stimuli initiate hatching of Daphnia diapausing eggs originating from lakes and temporary waters

Different thermal stimuli initiate hatching of Daphnia diapausing eggs originating from lakes and temporary waters

The effect of lake sediment on the hatching success of Daphnia ephippial eggs

Quantification of floating ephippia in lakes: a step to a better understanding of high dispersal propensity of freshwater plankters

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