rate of development
Dotaz
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106 s. : obr., tab., grafy ; 30 cm
- MeSH
- kvalita života MeSH
- monitorování životního prostředí MeSH
- morbidita MeSH
- mortalita MeSH
- Publikační typ
- kongresy MeSH
- Konspekt
- Veřejné zdraví a hygiena
- NLK Obory
- environmentální vědy
Knowledge of embryo development is essential to the application of reproductive biotechnology in aquaculture, including for pikeperch Sander lucioperca. We describe pikeperch embryo development and demonstrated effects of temperature on the duration of embryogenesis. Developmental stages in embryos incubated at 15 °C were identified as zygote, 0-1.5 h post-fertilization (hpf); cleavage, 2.5-7.5 hpf; blastula, 9-18.75 hpf; gastrula, 21-39, hpf; segmentation, 45-105 hpf; and hatching, 125-197 hpf. Additional groups of eggs were fertilized and incubated at 10, 15, 20, and 25 °C to document stages of development, development rate, and survival. The optimal fertilization and incubation temperature was shown to be 15 °C, with the highest fertilization, survival, and hatching rates. Embryo development was slower at 10 °C, with 45% of fertilized embryos surviving to hatching. Development was accelerated at 20 °C, and resulted in a 56% survival rate of fertilized embryos. At 25 °C, embryos did not develop to the blastula stage. Pikeperch could be a valuable percid model for research in which flexible incubation temperatures is required.
- MeSH
- embryo nesavčí fyziologie MeSH
- embryonální vývoj MeSH
- Perciformes embryologie MeSH
- teplota * MeSH
- voda * MeSH
- zvířata MeSH
- Check Tag
- mužské pohlaví MeSH
- ženské pohlaví MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
Extreme asynchrony in embryo development, a typical feature of annual killifish living in temporary pools, represents a bet-hedging strategy to cope with unpredictable rainfall. African annual killifish are distributed across a large precipitation gradient, raising the potential for local adaptation in the degree of developmental asynchrony (e.g. higher in arid areas, lower in humid areas). Eight populations of two sister species, Nothobranchius furzeri and Nothobranchius kadleci, from sites along the rainfall gradient were tested and compared for asynchrony and duration of embryo development. Degree of asynchrony and mean duration of embryo development did not differ across the examined range. Despite generally high developmental variability, fish from more arid regions (where rain is more erratic) produced a significantly higher proportion of short-developing embryos. Comparable developmental asynchrony, regardless of precipitation level, suggests that all populations tested need to cope with some level of rainfall stochasticity. By producing more short-developing embryos, however, fish in more arid areas with relatively more erratic rains are better adapted to very short pool durations and are more likely to produce multiple offspring generations within a single rainy season.
- MeSH
- biologická adaptace * MeSH
- Cyprinodontidae růst a vývoj MeSH
- Cyprinodontiformes MeSH
- déšť * MeSH
- embryonální vývoj * MeSH
- roční období MeSH
- zvířata MeSH
- Check Tag
- ženské pohlaví MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
- Geografické názvy
- Mosambik MeSH
- MeSH
- kojenecká mortalita trendy MeSH
- lidé MeSH
- naděje dožití trendy MeSH
- výdaje na zdravotnictví statistika a číselné údaje trendy MeSH
- zdravotnické zdroje ekonomika statistika a číselné údaje využití MeSH
- Check Tag
- lidé MeSH
- Geografické názvy
- Evropa MeSH
- MeSH
- dospělí MeSH
- lidé MeSH
- mladiství MeSH
- spektrální analýza metody MeSH
- srdeční frekvence MeSH
- věkové faktory MeSH
- Check Tag
- dospělí MeSH
- lidé MeSH
- mladiství MeSH
- mužské pohlaví MeSH
- ženské pohlaví MeSH
- Publikační typ
- přehledy MeSH
- srovnávací studie MeSH
