Revision of the Old World Daphnia (Ctenodaphnia) similis group Cladocera: Daphniidae)

POPOVA, EKATERINA V.; PETRUSEK, ADAM; KOŘÍNEK, VLADIMÍR; MERGEAY, JOACHIM; Bekker, Eugeniya I.; KARABANOV, DMITRY P.; GALIMOV, YAN R.; NERETINA, TATYANA V.; TAYLOR, DEREK J.; Kotov, Alexey A.

doi:10.11646/zootaxa.4160.2.1

Cited by 15 publications

(26 citation statements)

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“…So far, little is known about inducible morphological defenses in a species complex globally labelled as D. similis , which is currently separated into two species complexes ( D. similis and D. exilis , respectively) in the Old and New World (Adamowicz, Petrusek, Colbourne, Hebert, & Witt, 2009; Popova et al, 2016). Though it has to be mentioned, that this is just the use of the same name and both species are not even in a sister relationship.…”

Section: Introductionmentioning

confidence: 99%

“…Further, morphological changes, such as an elongation of the tail spine, of hatchlings from asexually and sexually produced eggs against fish kairomones, has been shown in individuals labelled as D. similis from Korea (La, Chang, Jang, Joo, & Kim, 2014). However, the origin of the daphnids used by La et al may imply that not D. similis but D. sinensis (Ma et al, 2016; Popova et al, 2016), a species related to D. similis was used for the study. Daphnia similis sensu stricto is alike representatives of the D. atkinsoni species complex a pond‐dwelling member of the Cladocera.…”

Section: Introductionmentioning

confidence: 99%

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Predator‐specific inducible morphological defenses of a water flea against two freshwater predators

Ritschar

Rabus

Laforsch

2020

Journal of Morphology

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The expression of inducible morphological defenses in Daphnia in response to a single predator is a well-known phenomenon. However, predator-specific modifications of the same defensive traits as an adaption to different predator regimes is so far only described for Daphnia barbata. It is unknown if this accounts only for this species or if it is a more widespread, general adaptive response in the genus Daphnia. In the present study, we therefore investigated whether a clone of the pond-dwelling species Daphnia similis responds to different predatory invertebrates (Triops cancriformis; Notonecta maculata) with the expression of predator-specific modifications of the same defensive traits. We showed that Triops-exposed individuals express a significantly longer tail-spine, while body width decreased in comparison to control individuals. Additionally, they also expressed inconspicuous defenses, that is, significantly longer spinules on the dorsal ridge. The Notonecta-exposed D. similis showed a significantly longer tail-spine, longer spinules and a larger spinules bearing area on the dorsal ridge than control individuals as well. However, a geometric morphometric analysis of the head shape revealed significant, predator-specific changes. Triopsexposed individuals expressed a flattened head shape with a pronounced dorsal edge, while Notonecta-exposed individuals developed a high and strongly rounded head.Our study describes so far unrecognized inducible defenses of D. similis against two predators in temporary waters. Furthermore, the predator-dependent change in head shape is in concordance with the 'concept of modality', which highlights the qualitative aspect of natural selection caused by predators. K E Y W O R D Shead shape, morphometry, phenotypic plasticity, predator-prey interactions

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Predator‐specific inducible morphological defenses of a water flea against two freshwater predators

Ritschar

Rabus

Laforsch

2020

Journal of Morphology

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“…Purple, pink and green represent respectively the sperm that are small, large with capsule or large with filaments exposed. Drawings represent the genital papilla of the males (from Benzie 2005 and Popova et al 2016) and indicate the atypical exaggerated structure of D. magna . Scale bar represent 0,1mm.…”

Section: Resultsmentioning

confidence: 99%

“…We further compared the shape of the male genital papilla across the Daphnia species, using drawing from published keys (Benzie, 2005; Popova et al , 2016) (Figure 1). Most species have no or a very inconspicuous papilla, the biggest exception is the papilla structure present in D. magna (Figure 1).…”

Section: Resultsmentioning

confidence: 99%

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Evolution of sperm morphology in a crustacean genus with fertilization inside an open brood pouch

Duneau

Moest

Ebert

2020

Preprint

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Founder effects determine the genetic structure of the water flea Daphnia in Ethiopian reservoirs

Haileselasie

Mergeay

Vanoverbeke

et al. 2017

Limnology & Oceanography

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Founder effects introduce stochasticity in the genetic structure of species at the regional scale. To the extent that founder effects are important, they will result in a reduced signature of space, time, and environmental variation in landscape genetic data. We studied the metapopulation genetic structure of recently founded populations of the microcrustacean Daphnia sinensis in 10 Ethiopian water reservoirs. We used three different approaches to estimate the number of effective founders and applied them to two independent genetic marker sets in an effort to investigate the role of founder effects and to estimate effective size of the founding population. Estimates of founding sizes rarely exceeded eight individuals but were most often limited to less than four individuals. No associations of genetic identities, gene frequencies, measures of genetic diversity, or differentiation with environmental and spatial variables were found. Age and size of the reservoirs were not correlated with genetic diversity measures or number of founders in these reservoirs. These findings indicate that neither strong selection, nor dispersal limitation are responsible for the observed pattern of genetic variation. Our results suggest a regional population structure that is strongly impacted by founder events, reflecting colonization by just a few founders per waterbody, and not noticeably influenced by subsequent dispersal and gene flow. Our results show that rapid colonization of empty habitats and fast population growth by a handful of founders can result in strong founder effects, even in relatively large habitats that are likely regularly reached by new immigrants.

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Revision of the Old World Daphnia (Ctenodaphnia) similis group Cladocera: Daphniidae)

Cited by 15 publications

References 0 publications

Predator‐specific inducible morphological defenses of a water flea against two freshwater predators

Predator‐specific inducible morphological defenses of a water flea against two freshwater predators

Evolution of sperm morphology in a crustacean genus with fertilization inside an open brood pouch

Founder effects determine the genetic structure of the water flea Daphnia in Ethiopian reservoirs

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