Studies on the Seasonal Life History of Three Species of Freshwater Ostracoda

Wetlands are one of the most valuable natural resources, providing a number of ecosystem services and socio-economic values. Small ponds sustain a rich aquatic biodiversity and because of their short hydrological regimen and small size are excellent environments for population studies of microcrustaceans such as ostracods. This study describes the population dynamics of the Ostracoda fauna in three temporary shallow lakes during one hydroperiod in Argentine Patagonia. Three cosmopolitan species were determined: Cypris pubera, Tonnacypris lutaria and Eucypris virens. Among them, T. lutaria is here reported for the first time from the Neotropical region. Multivariate ordination techniques were used to examine the relationships among environmental variables and ostracod density on each sampling site. High values of conductivity, absorption at 320 nm (as a measure of dissolved organic matter), dissolved oxygen concentration, temperature and chlorophyll a concentration correlated positively with ostracod density. All the populations studied reproduced parthenogenetically, and the life cycles of E.virens and C. pubera were followed in detail by weekly sampling of their populations. The former displayed continuous reproduction, whereas the latter showed a multivoltine strategy. The life history of C. pubera was affected by the seasonality of the habitat. The development rate correlated positively with water temperature; conductivity and temperature had a positive effect on adult size in C. pubera, while conductivity had a negative effect on adult size in E. virens. In this study, we present the first data set on the development and life history of ostracods in Patagonian freshwater environments. However, several questions remain and encourage us to further investigate the relative importance of ostracods in food webs, as well as the importance of inter-specific interactions between ostracods and other taxa.

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“…Journal of Natural History 1025 absence of thoracopods (Ferguson 1944). The mesh size (200 µm) allows individuals at instar A-8 to escape.…”

Section: Ostracod Identificationmentioning

confidence: 99%

Dynamics of ostracod populations from shallow lakes of Patagonia: life history insights

Coviaga

Cusminsky

Baccalá

et al. 2015

Journal of Natural History

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“…Heterocypris salinus matured in 45 days and C. aculeata matured in only 30 days. Ferguson (1944) hatched eggs must be collected, and the ostracods removed as they hatch to see if all the eggs hatch at one time or if there are several bursts of hatching, each giving rise to a separate cohort.…”

Section: Niche Relationsmentioning

confidence: 99%

Comparative observations on the ecology of four species of ostracods living in a temporary freshwater puddle

McLay¹

1978

Can. J. Zool.

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The population biologies of Cyprinotus carolinensis, Herpetocypris reptans, Cypricercus reticulatus, and Candona decora in a spring-fed, temporary, winter puddle in Vancouver, Canada, were studied during 1967–1969. All species emerged at the same time in the fall, when the puddle filled, and competed to reach maturity. The order of maturation was Candona, Cyprinotus, Cypricercus, and Herpetocypris. Abundance was positively related to adult size of each species. Survivorship and fecundity patterns are given for Herpetocypris and Cyprinotus. Survivorship is closest to the type-I kind.All species have similar feeding appendages and ate grass detritus and its microinhabitants. They differed in their spatial distribution, each species being most abundant along a section of the rut. They also differed in their mobility and foraging patterns. The presence of grass was effective in restricting dispersal. Distribution and abundance of these species may be accounted for either in terms of competitive interactions or in terms of adaptation to physical differences in the environment.

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“…During mating in a reversed ventral to ventral position, the antennae of males of P. pratensis are also tucked out of the way (Danielopol, 1980). Contrary to this, other authors (e.g., Kaufmann, 1892;Rioja, 1940;Ferguson, 1944) stressed the role of the An2 in attaching the male to the dorsoposterior of the female carapace during copulation, indicating that the precise method of attachment varies between different groups, even though the copulation position may be similar.…”

Section: The Male An2mentioning

confidence: 88%

“…Although a large number of studies have documented the behaviour and position of males and females before, during and after copulation in many different groups (e.g., Sars, 1889;Vá vra, 1891;Jensen, 1904;Klie, 1926;Ferguson, 1944;McGregor & Kesling, 1969b;Hart & Hart, 1974;Danielopol, 1976Danielopol, , 1977Danielopol, , 1978Kamiya, 1988;Danieopol & Horne, 1996;Parker, 1997;Horne et al, 1998) and even possible copulation positions for extinct groups (e.g., Kesling, 1969), there has been little attention given to the interaction between the male and female sexual organs, a result of their tiny size and the often translucent nature of the carapaces which hinders detailed observations. For the giant spermatozoa of the Cypridoidea to be successfully pumped under the forces of the Zenker organs into the females' seminal receptacle the connection between the sex organs must be secure, but how is this achieved?…”

Section: Introductionmentioning

confidence: 99%

Copulatory behaviour and sexual morphology of three Fabaeformiscandona Krstić, 1972 (Candoninae, Ostracoda, Crustacea) species from Japan, including descriptions of two new species

Smith

Kamiya

2007

Hydrobiologia

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Copulatory behaviour and sexual morphology of three Fabaeformiscandona Krstić, 1972 (Candoninae, Ostracoda, Crustacea) species from Japan, including descriptions of two new species Robin J. Smith AE Takahiro Kamiya Ó Springer Science+Business Media B.V. 2007Abstract Two new species of Fabaeformiscandona and collections of Fabaeformiscandona japonica (Okubo, 1990. Bulletin Biogeography Society of Japan 45: 39-50) from Japan have provided an opportunity to study the copulatory behaviour and sexual morphology of these species. The male uses the large fifth limb palps to force open the female carapace for copulation. However, the female has an enlarged overlapping flap over the posterior of the carapace which appears to hinder the male from opening the carapace, thus the female retains some control over potential mates. During copulation, the males' fifth limbs, caudal ramus and m process of the hemipenes and the females' protrusion of the female reproductive organ play a crucial role in providing a secure interface between the sexual organs to allow for the transfer of the giant spermatozoa. Development of the sexual organs in both sexes begins during the A-2 instar, and the protrusion of the female genital lobe begins to form during the A-1 instar.

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Studies on the Seasonal Life History of Three Species of Freshwater Ostracoda

Cited by 23 publications

References 3 publications

Dynamics of ostracod populations from shallow lakes of Patagonia: life history insights

Dynamics of ostracod populations from shallow lakes of Patagonia: life history insights

Comparative observations on the ecology of four species of ostracods living in a temporary freshwater puddle

Copulatory behaviour and sexual morphology of three Fabaeformiscandona Krstić, 1972 (Candoninae, Ostracoda, Crustacea) species from Japan, including descriptions of two new species

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