Early release of eggs and embryos in a brooding ancient asexual ostracod: brood selection or a gambling strategy to increase fecundity?

Pinto, Ricardo L.; Rocha, Carlos Eduardo Falavigna da; Martens, Koen

doi:10.1007/s10750-007-0641-6

Cited by 10 publications

(3 citation statements)

References 8 publications

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“…In comparison with other parthenogenetic ostracods, especially surface water ones that lay many more eggs (Rossi et al, 2011) or lineages that display a brooding care, such as darwinulids (see Pinto et al, 2007), the strategy of parthenogenetic subterranean Candoninae does not promise much success when it comes to the species dispersal strategies. The importance of resting eggs and parthenogenesis in freshwater ostracod evolutionary success has already been discussed elsewhere (Horne, 1993).…”

Section: Discussionmentioning

confidence: 99%

Zoogeography of the ostracod genusNannocandona(Podocopa) with description of two new species from Europe and East Asia

Karanovic

Sídorov

Marmonier

2015

Ann. Limnol. - Int. J. Lim.

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-Candoninae is by far the most diverse ostracod group in subterranean habitats, with many genera which today have no surface water representatives. This subfamily is also peculiar because species tend to have restricted distributions regardless of habitat type, and, unlike other non-marine ostracod lineages, extremely rarely reproduce parthenogenetically. Nannocandona faba Ekman, 1914 is an exception, being originally described from Sweden, but then reported throughout the Holarctic. We study morphological variability of this species here, both based on old museum specimens and on freshly collected material. We propose that the name should only be restricted to the Swedish population, and we describe two new subterranean species: Nannocandona danielopoli n. sp. from Austria, and Nannocandona schornikovi n. sp. from South Korea and the Russian Far East. These descriptions allow us to evaluate records of N. faba in other parts of the Holarctic. A new map of the genus distribution is proposed, as well as a key to species identification. Parthenogenetic reproduction of Candoninae and their general ecology is also discussed.

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Section: Discussionmentioning

confidence: 99%

Zoogeography of the ostracod genusNannocandona(Podocopa) with description of two new species from Europe and East Asia

Karanovic

Sídorov

Marmonier

2015

Ann. Limnol. - Int. J. Lim.

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“…Individuals with abnormalities in valve or limb morphology have been observed in some darwinulid populations. Such deviant morphologies are thought to be mostly epigenetic and due to developmental errors during the moulting process rather than be genetically transmitted (roSSetti & martenS, 1998, Pinto et al, 2007, but a genetic basis cannot be excluded a priori (see below).…”

Section: Phenotypic Evolution In Darwinulidsmentioning

confidence: 99%

Description of a new genus and two new species of Darwinulidae (Crustacea, Ostracoda), from Christmas Island (Indian Ocean) with some considerations on the morphological evolution of ancient asexuals

Rossetti,

Pinto,

Martens

2024

Belg. J. Zool.

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Darwinulidae is believed to be one of the few metazoan taxa in which fully asexual reproduction might have persisted for millions of years. Although rare males in a single darwinulid species have recently been found, they may be non-functional atavisms. The representatives of this family are characterized by a slow evolutionary rate, resulting in a conservative morphology in the different lineages over long time frames and across wide geographic ranges. Differences between species and genera, although often based on small details of valve morphology and chaetotaxy, are nevertheless well-recognizable. Five Recent genera (Darwinula, Alicenula, Vestalenula, Penthesilenula and Microdarwinula) and about 35 living species, including also those left in open nomenclature, are included in this family. Previous phylogenetic analyses using both morphological characters and molecular data confirmed that the five genera are good phyletic units. Here, we report on the results of a study on darwinulid ostracods from Christmas Island (Indian Ocean). The taxonomic investigation led to the description of a new genus and two new species, namely Isabenula humphreysi gen. nov. sp. nov. and Vestalenula sp. E, this latter being left in open nomenclature, because only one individual was available. A new phylogeny of the family, using 30 morphological characters of 23 described species, is here presented. A key to the genera of Recent Darwinulidae, based on the morphology of valves and soft parts in adult females, is also provided. The discovery of Isabenula gen. nov., which shares intermediate morphological features with the genera Vestalenula and Penthesilenula, opens new opportunities to critically reconsider previous hypotheses on tempo and mode of evolution in the family Darwinulidae and on the phylogenetic relationships between its representatives.

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“…This strategy increases the probability of a population persisting during stochastic events to avoid all available eggs hatching at once when conditions will not allow animals to mature and produce new eggs (Evans & Dennehy, 2005;Simons, 2011). Bethedging has thus far not been demonstrated for ostracods (Pinto et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Species' traits and taxonomic distance can predict the hatching phenology of ostracod (Crustacea) resting eggs from tropical floodplain lakes

et al. 2021

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Freshwater ostracods are commonly found in temporary ponds and lakes, surviving drought periods by producing resting eggs. We investigated the hatching phenology of ostracod resting eggs from the sediments of temporary floodplain lakes, considering both the taxonomic distance between species and their functional traits, such as carapace size (length and height) and shape, valve ornamentation, and reproductive mode. In addition, we tested the hypotheses: (1) that the hatching time is more similar between congeneric ostracod species than between noncongeneric species; (2) that differences in hatching time between congeneric species are often related to differences in functional traits; (3) that both species composition and functional traits composition of hatchlings change over the incubation time, but with a reduction in the variability over time. The experiment was conducted for 98 days in the laboratory, and the microcosms were monitored weekly. The first hatching of an ostracod was recorded during the second week of incubation after hydration of the sediments. A total of 12 ostracod species hatched, belonging to the families Cyprididae and Candonidae. The above three hypotheses were corroborated. The time between inundation and first hatching was mostly similar for congeneric species in the genus Chlamydotheca, but was different between some species of Strandesia, which might be owing to differences in functional traits. The species composition and functional trait composition of the hatched ostracods were significantly different over the 14 weeks of incubation due to the different hatching phenology of different species. Furthermore, our results show that both taxonomic distance and functional traits can influence the hatching time of ostracod resting eggs from temporary floodplain lakes. Thus, future studies addressing the hatching phenology of ostracod resting eggs (and resting stages from other invertebrates) should also emphasize the use of functional traits.

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Early release of eggs and embryos in a brooding ancient asexual ostracod: brood selection or a gambling strategy to increase fecundity?

Cited by 10 publications

References 8 publications

Zoogeography of the ostracod genusNannocandona(Podocopa) with description of two new species from Europe and East Asia

Zoogeography of the ostracod genusNannocandona(Podocopa) with description of two new species from Europe and East Asia

Description of a new genus and two new species of Darwinulidae (Crustacea, Ostracoda), from Christmas Island (Indian Ocean) with some considerations on the morphological evolution of ancient asexuals

Species' traits and taxonomic distance can predict the hatching phenology of ostracod (Crustacea) resting eggs from tropical floodplain lakes

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