Experimental evaluation of Candonocypris novaezelandiae (Crustacea: Ostracoda) in the biocontrol of Schistosomiasis mansoni transmission

Yousif, Fouad; Hafez, Sherif M.; Bardicy, Samia El; Tadros, Menerva; Taleb, Hoda Abu

doi:10.1016/s2221-1691(13)60061-1

Cited by 12 publications

(5 citation statements)

References 9 publications

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“…Adult C. novaezelandiae lay desiccation‐resistant eggs that hatch rapidly in both field and laboratory, and most eggs may hatch in response to inundation (Strachan et al ., ), showing little resistance to false starts. However, C. novaezelandiae prey on the desiccation‐resistant eggs of other invertebrate species (Yousif et al ., ) so a food source is immediately available to them upon hatching. Although parthenogenetic life histories permit rapid egg‐laying, assisting survival in unpredictable environments, they may be inflexible and have few other options to respond to drying.…”

Section: Discussionmentioning

confidence: 99%

Habitat alters the effect of false starts on seasonal‐wetland invertebrates

2016

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Habitat alters the effect of false starts on seasonal-wetland invertebrates. 2. A laboratory emergence experiment was used to determine whether the abortive hatching caused by false starts alters assemblage composition in the subsequent hydroperiod; and whether the length of the dry period following a false start alters subsequent assemblage composition. Sediment for the experiment was collected from Lake Joondalup South, Swan Coastal Plain (SCP), Western Australia, because it has a relatively diverse assemblage of desiccation-resistant invertebrate propagules. Most wetlands on the SCP are seasonal and groundwater-fed and the region has a mediterranean-type climate 3. Two different habitat types (open water (OW) and fringing trees (FT)) with distinct freshwater invertebrate assemblages are commonly found in SCP wetlands. We repeated the experiment in sediment from both habitats to determine whether false starts had the same effect on the two assemblages. Replicate sediment samples from both habitats were placed in microcosms randomly allocated to treatments or controls.To simulate false starts of differing dry-period duration, treatments were inundated for five days, then allowed to dry out for different time periods (10, 20, 30 days) then inundated for five days. Controls were inundated for time periods equivalent to the total duration of each false start treatment (20, 30, 40 days). 4. FT sediment had higher organic matter and moisture content than OW sediment. The composition of the emerging assemblage differed between habitats, and emergence was slower from OW than FT sediment. Abortive hatching followed the false start in OW sediment, but subsequently the same assemblage emerged, showing reliance on the egg bank to re-supply lost populations. Abortive hatching was not observed in FT sediment, where invertebrates survived drying during the false start, continuing to develop for up to 30 d without surface water, because those sediments retained moisture.5. Provided that winter-spring hydroperiods continue to inundate OW for several months, these results indicate that invertebrates will be able to complete their life cycles and replenish egg banks following abortive hatching, demonstrating resilience to false starts. False starts to winter inundation rarely occur more than a month prior to the start of 'true' winter rains, so FT assemblages are resistant to false starts, showing the ability to survive dry periods of up to 30 days. Furthermore, survival in damp FT sediment also gave these populations a 'head start', because the surviving assemblage was identical to the continuously inundated control. 6.Assemblages emerging from beneath FT may potentially recolonise inundated OW habitat. So far, changes to SCP seasonal-wetland hydroperiods will be within the coping range of their invertebrate assemblages. As FT assemblages were more resistant to false starts, restoration schemes that increase shading by fringing vegetation should be encouraged.

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Section: Discussionmentioning

confidence: 99%

Habitat alters the effect of false starts on seasonal‐wetland invertebrates

2016

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“…Nevertheless, some biological interactions, such as predation, or resource depletion can act as limiting factors in natural conditions. For example, Yousif et al (2013), showed how ostracods can prey over resting forms of another species acting as a biocontrol. Freiry, Weber, et al (2020) studied the diversity of zooplankton resting forms from temporary ponds in a subtropical region.…”

Section: Asymptotic Formentioning

confidence: 99%

An evaluation of crustacean and rotifer diversity and composition in a temporary pond metacommunity: Comparing results from field samples and a hatching experiment

et al. 2022

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Many aquatic invertebrates that inhabit temporary ponds produce resting forms to overcome the dry period, building up the egg bank. When the wet phase returns, the resting forms hatch and the community is restored, and then pioneer species may have a major influence on how the pond community will assemble. We aimed to evaluate the diversity of an initial pond metacommunity by comparing the early active metacommunity collected in the field and the egg bank metacommunity (by carrying out a hatching experiment) of 32 Mediterranean temporary ponds. We hypothesised that both metacommunities would be similar but also that species turnover may play an important role, and that γ diversity would be similar with both approaches. After the identification and counting of rotifers and crustaceans in both metacommunities (i.e. the field vs. the experiment) we performed a Partial Triadic Analysis comparing the field metacommunity with those corresponding to each of the eight times the hatching experiment was checked for hatchlings. Furthermore, we compared the field and experimental metacommunities with a PROTEST analysis and identified the taxa responsible for differences between metacommunities with a SIMPER analysis. We assessed γ diversity using a size‐based rarefaction curve and an evenness profile and explored β diversity and its components (turnover and nestedness) for the two metacommunities. Our experimental results showed differences in the temporal pattern of emergence between groups of organisms, with copepods, rotifers, and anostracans appearing first, but ostracods and rotifers reaching the highest diversity at the end of the experiment. The active and experimental pioneer metacommunities were similar according to a Procrustes analysis. Nevertheless, β diversity was high in both metacommunities and the differences among ponds and between both assemblages were mostly explained by species turnover. Both the active and experimental pond metacommunities showed some exclusive species that may be more difficult to uncover with only one type of approach. Furthermore, the high β diversity observed indicates that each temporary pond is an important contributor to γ diversity in the metacommunity. These results show that hatching experiments provide information that is complementary to standard sampling of the active community, and consequently is a useful tool to uncover pond biodiversity.

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“…Gyrinidae were prey on the freshwater snail and consume trematode larva miracidia [46,47]. As a result, the prevalence of freshwater snail infection with trematode might be reduced.…”

Section: Relationship Between Snail Infection and Salinity [34]mentioning

confidence: 99%

Impacts of Environmental Parameters on the Infectivity of Freshwater Snail

Korma¹

2022

Update on Malacology

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The successful transmission of the infective stage of the parasite (miracidia) depends on different factors. These free-living stages miracidia rely on their own stored energy and are directly exposed to environmental factors including disturbance resulting from pollution and human activities. There are different environmental factors that affect the cercarial infection of the snail. These include pH, temperature, salinity, dissolved oxygen, water hardness, habitat conditions, presence of predators and competitors, etc. Each of these factors may increase or decrease the freshwater snail’s infectivity. The more hydrogen ion concentration in the aquatic habitat could have an effect on the maturation and physiology of the parasitic stage (miracidia), leading to impaired survival and reduced infectivity. In contrast, high temperature increases snail infectivity. While low dissolved oxygen in the aquatic environment results in low snail infectivity. Regarding the presence of predators can result in low snail infectivity by consuming the schistosome egg and the snails themselves. Total hardness also had a negative impact on the prevalence of snail infection. The hardness of the water results in the shell hardening of snails subsequently leads to low infection of snail by miracidia.

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Experimental evaluation of Candonocypris novaezelandiae (Crustacea: Ostracoda) in the biocontrol of Schistosomiasis mansoni transmission

Cited by 12 publications

References 9 publications

Habitat alters the effect of false starts on seasonal‐wetland invertebrates

Habitat alters the effect of false starts on seasonal‐wetland invertebrates

An evaluation of crustacean and rotifer diversity and composition in a temporary pond metacommunity: Comparing results from field samples and a hatching experiment

Impacts of Environmental Parameters on the Infectivity of Freshwater Snail

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