Food selection in Eucypris virens (Crustacea: Ostracoda) under experimental conditions

Schmit, Olivier; Rossetti, Giampaolo; Vandekerkhove, Jochen; Mezquita, Francesc

doi:10.1007/s10750-007-0634-5

Cited by 35 publications

(12 citation statements)

References 17 publications

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“…All jars were checked twice (weeks 1–3) or once a week (weeks 4–11) for hatchlings. Hatchlings were grown in batches to adults in 50‐mL jars filled with carbonated mineral water (Fuente Primavera) and fed living cyanobacteria ( Tolypothrix tenuis ; Schmit et al. , 2007).…”

Section: Methodsmentioning

confidence: 99%

Experimental assessment of the fecundity of Eucypris virens (Ostracoda, Crustacea) under natural sex ratios

Vandekerkhove

Matzke‐Karasz²,

Mezquita

et al. 2007

Freshwater Biology

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1. The adaptive significance of the observed variations in sex ratios in non-marine ostracods is unclear. This study quantified the fecundity of females taken from a presumed fully sexual Eucypris virens population that were experimentally combined with different proportions of males (male : female sex ratios: 1 : 1, 1 : 2, 1 : 4, 1 : 8 and 0 : 1). 2. The results yielded no indications that female fecundity is altered by short-term variations in the proportion of males, at least not within the range of sex ratios that are common in natural ostracod populations. Complete removal of males, however, did strongly reduce hatching success of dried eggs. This suggests the need for multiple mating events during the reproductive lifetime of the female. It also emphasizes the need for a minimum number of males, although this minimum number evidently may be rather low, as we found a high number of spermatozoa in the seminal receptacles after a single mating event.3. The sex ratio in the source population was strongly female biased (1 : 3.4; n ¼ 514), whereas in the hatchling assemblages reared in the laboratory, males and females were found in equal proportions (1 : 1.0; n ¼ 1516), irrespective of the prevailing sex ratio. This clear discrepancy is intriguing, and points to the importance of epigenetic factors for the determination of field sex ratios.

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Section: Methodsmentioning

confidence: 99%

Experimental assessment of the fecundity of Eucypris virens (Ostracoda, Crustacea) under natural sex ratios

Vandekerkhove

Matzke‐Karasz²,

Mezquita

et al. 2007

Freshwater Biology

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“…Juveniles captured that could not be identified (mostly Ostracoda) were cultured in separate 100-mL microaquaria at the same culturing conditions and grew up to obtain adults for a correct identification (unless they died prior to attaining adulthood). These individuals were fed on mixed food following Schmit et al (2007). Conductivity, oxygen content (at day and night), and pH were measured on three occasions (days 2, 13, 24) in each aquaria.…”

Section: Study Sitementioning

confidence: 99%

Human-mediated dispersal of aquatic invertebrates with waterproof footwear

Valls

Castillo‐Escrivà

Mesquita‐Joanes

et al. 2015

Ambio

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Human-mediated dispersal has rarely been considered in wetland conservation strategies at regional scales, yet high concern exists about this aspect for (inter-)national management considering invasive species in other aquatic systems. In this context, we aim at understanding the role of human-mediated dispersal by footwear in protected wetlands with high conservation value. Zooplankton and zoobenthos were sampled in 13 shallow lakes in central Spain and, at the same time, mud attached to waders was collected and later cultured in deionized water under laboratory conditions for 4 weeks. Two-hundred and four individuals belonging to 19 invertebrate taxa were recovered after hatching; Ostracoda (84 %), Cladocera (53 %), Copepoda (30 %), Anostraca (30 %), and Notostraca (7 %) were the most frequent groups among the hatched crustaceans. NMDS and PERMANOVA analyses showed significant differences between the dispersed (via footwear) and the source active metacommunity, suggesting different dispersal abilities among the species found. Human vectors facilitate dispersal among protected lakes, which could eventuality lead to biotic homogenization and faster spread of non-indigenous species. Preservation strategies and education campaigns associated to target humans in close contact with water bodies should be imperative in conservation management of protected lakes.

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“…In our study, all ponds with males were situated in Spain, while asexual populations were sampled in Croatia, the U. K. and Italy (Table 1). Ostracods were fed with algae and spinach (Schmit et al, 2007), and water was renewed weekly. In ponds MF4 and MFP, males were only slightly underrepresented at the moment of sampling (Table 1), suggesting a strong numerical dominance of sexual females.…”

Section: Methodsmentioning

confidence: 99%

Extreme tolerance to environmental stress of sexual and parthenogenetic resting eggs of Eucypris virens (Crustacea, Ostracoda)

et al. 2012

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Summary 1. The freshwater ostracod (Ostracoda), Eucypris virens, is commonly found in European temporary pools, where its long‐term persistence completely relies on the build‐up of resting egg banks. Extreme tolerance of dormant eggs and seeds is widely assumed, but freshwater ostracod eggs are relatively poorly studied. The study of ostracod resting eggs is of particular relevance as it may yield the key to understanding the distribution of the sexes in many species capable of both sexual and asexual reproduction. 2. We assessed the tolerance of dried resting eggs produced by females originating from three populations with males and three all‐female E. virens populations. Hatching time and success was compared between control eggs and eggs exposed to one of seven ecologically relevant stressors: digestive enzymes, high salinity, deep freezing, hydration, UV‐B radiation, hypoxia and insecticide treatment. 3. None of the stressors reduced significantly the viability of either sexual or asexual eggs. When compared with the reproductive mode–specific controls, exposure to UV‐B radiation had a mild impact on the survival of sexual and asexual eggs (−16.8 and −22.4%, respectively), but this was only significant for asexual eggs. These results point to an extreme tolerance of E. virens resting eggs and have important implications for the ecology and evolution of the species. 4. The timing of hatching was not affected by the stress treatment, except for UV‐B radiation. A marginally significant delay in hatching response was observed for UV‐B‐radiated eggs when compared to the overall mean, but this treatment effect was absent when compared with the reproductive mode–specific controls. 5. The populations with males produced eggs that hatched on average earlier (−1.5 days at 17 °C) and were more successful (+26%) than asexual eggs. Due to the limited number of populations and the population‐specific origin and age of the eggs, the possibility due to the differences in age and origin of the resting eggs, or to variations in local conditions, cannot be ruled out.

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Food selection in Eucypris virens (Crustacea: Ostracoda) under experimental conditions

Cited by 35 publications

References 17 publications

Experimental assessment of the fecundity of Eucypris virens (Ostracoda, Crustacea) under natural sex ratios

Experimental assessment of the fecundity of Eucypris virens (Ostracoda, Crustacea) under natural sex ratios

Human-mediated dispersal of aquatic invertebrates with waterproof footwear

Extreme tolerance to environmental stress of sexual and parthenogenetic resting eggs of Eucypris virens (Crustacea, Ostracoda)

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