Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Demographic processes underlying fitness restoration in bdelloid rotifers emerging from dehydration |
| Abstract | [object Object]1. Bdelloid rotifers are able to survive habitat desiccation in a dehydrated state termed anhydrobiosis. They suffer from decreasing fitness when they are exposed to permanent hydration, yet they restore fitness when they go through anhydro- biosis. The demographic processes underlying this rejuvenation, however, are still largely unknown. 2. To investigate these processes in detail, we analysed life tables of permanently hydrated and repeatedly desiccated lines of two species of bdelloid rotifers, Macrotrachela quadricornifera and Adineta ricciae. Experimental lineages of these two species originated from habitats with contrasting desiccation frequencies. 3. First, we built a three-stage life cycle including juveniles as well as prime and senescent adults. Next, we estimated stage-specific vital rates (survival, develop- ment, and reproduction) and used the estimates to project the asymptotic popula- tion growth rates ? (= er). Finally, we applied life-table response experiment methods and performed elasticity analysis to assess the contributions of each vital rate to differences in ? and to estimate effects of proportional changes in vital rates on ?, respectively. 4. We demonstrated that repeatedly desiccated lines grew faster than permanently hydrated lines. In addition, we confirmed that offspring of post-anhydrobiotic in- dividuals had higher fecundities and matured faster than individuals of the perma- nently hydrated lines. Survival rates usually did not differ between the two lines, but ? was most elastic to survival rates of prime adults and juveniles. These gen- eral life-history patterns were observed in both species. 5. The analyses performed here provide a detailed investigation of the demographic processes underlying fitness restoration in anhydrobiotic bdelloid rotifers. They reveal that habitat desiccation has profound and consistent effects on the life histories of the two study species. Because laboratory lineages of these species originated from habitats characterised by different wet/dry regimes, we suggest that the desiccation responses identified here may be representative for the en- tire taxon. As such, our study offers a starting point for comparative analyses be- yond bdelloid rotifers. |
| Source | Freshwater biology (Print) |
| Keywords | anhydrobiosishabitat desiccationlife historypopulation growth ratevital rate |
| Journal | Freshwater biology (Print) |
| Editor | Blackwell Scientific Publications., Edinburgh, Regno Unito |
| Year | 2019 |
| Type | Articolo in rivista |
| DOI | 10.1111/fwb.13305 |
| Authors | Sommer, Stefan; Fontaneto, Diego; Ozgul, Arpat |
| Text | 402742 2019 10.1111/fwb.13305 Scopus 2 s2.0 85064718843 anhydrobiosis habitat desiccation life history population growth rate vital rate Demographic processes underlying fitness restoration in bdelloid rotifers emerging from dehydration Sommer, Stefan; Fontaneto, Diego; Ozgul, Arpat Consiglio Nazionale delle Ricerche; University of Zurich object Object 1. Bdelloid rotifers are able to survive habitat desiccation in a dehydrated state termed anhydrobiosis. They suffer from decreasing fitness when they are exposed to permanent hydration, yet they restore fitness when they go through anhydro biosis. The demographic processes underlying this rejuvenation, however, are still largely unknown. 2. To investigate these processes in detail, we analysed life tables of permanently hydrated and repeatedly desiccated lines of two species of bdelloid rotifers, Macrotrachela quadricornifera and Adineta ricciae. Experimental lineages of these two species originated from habitats with contrasting desiccation frequencies. 3. First, we built a three stage life cycle including juveniles as well as prime and senescent adults. Next, we estimated stage specific vital rates survival, develop ment, and reproduction and used the estimates to project the asymptotic popula tion growth rates = er . Finally, we applied life table response experiment methods and performed elasticity analysis to assess the contributions of each vital rate to differences in and to estimate effects of proportional changes in vital rates on , respectively. 4. We demonstrated that repeatedly desiccated lines grew faster than permanently hydrated lines. In addition, we confirmed that offspring of post anhydrobiotic in dividuals had higher fecundities and matured faster than individuals of the perma nently hydrated lines. Survival rates usually did not differ between the two lines, but was most elastic to survival rates of prime adults and juveniles. These gen eral life history patterns were observed in both species. 5. The analyses performed here provide a detailed investigation of the demographic processes underlying fitness restoration in anhydrobiotic bdelloid rotifers. They reveal that habitat desiccation has profound and consistent effects on the life histories of the two study species. Because laboratory lineages of these species originated from habitats characterised by different wet/dry regimes, we suggest that the desiccation responses identified here may be representative for the en tire taxon. As such, our study offers a starting point for comparative analyses be yond bdelloid rotifers. Published version http //www.scopus.com/record/display.url eid=2 s2.0 85064718843 origin=inward som AS7497254059540531555759874661_content_1.pdf Articolo in rivista Blackwell Scientific Publications. 0046 5070 Freshwater biology Print Freshwater biology Print Freshw. biol. Print diego.fontaneto FONTANETO DIEGO |