Internal structure of Daphnia ephippium as an adaptation to dispersion

Bernatowicz, Piotr; Radzikowski, Jacek; Paterczyk, Bohdan; Bębas, Piotr; Ślusarczyk, Mirosław

doi:10.1016/j.jcz.2018.06.006

Cited by 9 publications

(3 citation statements)

References 34 publications

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“…In D. cucullata, the lack of evidence for isolation by distance or for temperature-related genetic structure suggests the existence of gene flow between populations in heated and control lakes. This gene flow could be facilitated by the short distances and existing waterways between the heated and control lakes, which enable the transfer of Daphnia or their resting eggs via watercourses and numerous other vectors 32 . For this reason, it would seem likely that the separation of D. galeata and D. longispina is maintained by temperature-mediated selection rather than by a limited possibility for migration.…”

Section: Discussionmentioning

confidence: 99%

Temperature increase altered Daphnia community structure in artificially heated lakes: a potential scenario for a warmer future

Dziuba

Herdegen-Radwan

Pluta

et al. 2020

Sci Rep

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Under conditions of global warming, organisms are expected to track their thermal preferences, invading new habitats at higher latitudes and altitudes and altering the structure of local communities. To fend off potential invaders, indigenous communities/populations will have to rapidly adapt to the increase in temperature. In this study, we tested if decades of artificial water heating changed the structure of communities and populations of the Daphnia longispina species complex. We compared the species composition of contemporary Daphnia communities inhabiting five lakes heated by power plants and four non-heated control lakes. The heated lakes are ca. 3-4 °C warmer, as all lakes are expected to be by 2100 according to climate change forecasts. We also genotyped subfossil resting eggs to describe past shifts in Daphnia community structure that were induced by lake heating. Both approaches revealed a rapid replacement of indigenous D. longispina and D. cucullata by invader D. galeata immediately after the onset of heating, followed by a gradual recovery of the D. cucullata population. Our findings clearly indicate that, in response to global warming, community restructuring may occur faster than evolutionary adaptation. The eventual recolonisation by D. cucullata indicates that adaptation to novel conditions can be time-lagged, and suggests that the long-term consequences of ecosystem disturbance may differ from short-term observations. Temperature increase, a major component of climate change 1 , is expected to exert a strong direct impact on the functioning of freshwater organisms, e.g., modifying their physiology, development, and/or fitness 2-5. Rising temperatures will also trigger a multitude of indirect effects on aquatic habitats, including alteration of abiotic parameters (e.g., oxygen saturation and ice cover duration) 6,7 and biotic interactions (e.g., changes in primary production, predation intensity, mismatches in the occurrence of interdependent species, and altered hostparasite interaction dynamics) 6,8,9. These changes will have an impact on the performance of individuals, and consequently on the structure and functioning of populations and communities 10,11. Based on the current effects of climate change and models of further warming, it is predicted that many species could be threatened with extinction 12,13. Thus, forecasting species' responses to the warming climate is a timely issue in ecology, evolutionary biology, and environmental protection. According to Bellard and coauthors 14 , there are three non-exclusive types of organismal responses to climate change, namely, alterations in (1) time of occurrence (e.g., shifts in phenology), (2) space (e.g., altered distribution range), and (3) self (i.e., changes in organisms' physiology, not related to spatial or temporal changes). A change

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Section: Discussionmentioning

confidence: 99%

Temperature increase altered Daphnia community structure in artificially heated lakes: a potential scenario for a warmer future

Dziuba

Herdegen-Radwan

Pluta

et al. 2020

Sci Rep

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“…As shown in Figure 2a3, the plate is covered with a honeycomb structure with hollow cells that can be filled with air, making them float on the water surface. 42 These honeycomb structures offer enhanced protection against external mechanical damage 43 and have diameters in the range of 4.8−14.1 μm. The average weight of the 50 ephippia is measured to be 0.13 ± 0.02 dyn.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

Attachment and Release of Water Fleas’ Ephippia on a Medium-Sized Waterfowl’s Leg for Migration

Wang,

Xu,

Luo

2023

Langmuir

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Planktonic crustaceans of the genus Daphnia live in aquatic environments. Although they lack walking and flying capabilities, they have developed adaptations that facilitate the dispersal of their dormant forms, ephippia, to cross terrestrial barriers and reach neighborhood water bodies. It increases the survival rate of their species. It is reported that one of the ways this spread occurs is the transport of their ephippia through waterfowls' legs. Yet, little is known about how these ephippia are initially attached to the waterfowls' legs. In this work, using the legs of American Pekin ducks as test samples, we found that a "coating" mechanism might play a significant role in this attachment and that surface tension-induced attraction might have a secondary effect on it. Furthermore, we demonstrated that, no matter whether a duck's leg was inserted into water at a high or low speed, an ephippium could be released from the leg.

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“…In addition, some dormant stages of species of Daphniidae, after being shed by their mother in the pelagic zone, may absorb air upon brief contact with the atmosphere, which makes them positively buoyant, keeping them on the water surface. Consequently, they could be transported horizontally by wind until the littoral zone of the lake(Bernatowicz et al 2018).…”

mentioning

confidence: 99%

Littoral zone provide habitats for dormant stages of cladocerans in tropical lakes

Daré

Henry

Perbiche‐Neves

et al. 2023

Preprint

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There is still a lack of fundamental knowledge about the dormant egg bank in the littoral zone, as much of the existing knowledge comes from studies conducted in the pelagic zone. In this study, we compared the diversity and composition of active cladocerans collected from the water column with cladocerans hatching from sediment and macrophyte roots containing dormant egg banks, all collected from the littoral zone of four tropical lakes. Two hypotheses are tested: (1) dormant assemblage will have highest diversity than active assemblage, and (2) pelagic taxa integrate the variability of both active and dormant assemblage in the littoral zone. Dormant assemblages hatchlings from macrophytes contributed less than 2% of the total assemblage numerical abundance, which was too low to undertake any ecologically meaningful analyses. However, dormant assemblage hatchlings from sediment samples showed the highest diversity for two of the four lakes studied, partially supporting our first hypothesis. Our results revealed that pelagic species (Bosminopsis, Ceriodaphnia, and Diaphanosoma) contributed half of the total species richness of active and dormant assemblages in all four lakes. These findings provide new insights into how the littoral zone of shallow lakes with well-developed macrophyte stands can offer a habitat for persistent dormant egg banks of certain pelagic cladocerans. Our increasing understanding of the interaction between dormant banks and active assemblages can be used to predict the dynamics of the zooplankton and develop restoration programs in lakes affected by climate change, such as extreme drought or human land and water use.

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Internal structure of Daphnia ephippium as an adaptation to dispersion

Cited by 9 publications

References 34 publications

Temperature increase altered Daphnia community structure in artificially heated lakes: a potential scenario for a warmer future

Temperature increase altered Daphnia community structure in artificially heated lakes: a potential scenario for a warmer future

Attachment and Release of Water Fleas’ Ephippia on a Medium-Sized Waterfowl’s Leg for Migration

Littoral zone provide habitats for dormant stages of cladocerans in tropical lakes

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