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001-es BibID:	BIBFORM081447
Első szerző:	Rosa Márta Erzsébet
Cím:	Response of green hydra (Hydra viridissima) to variability and directional changes in food availability / Márta E. Rosa, Flóra Bradács, Jácint Tökölyi
Dátum:	2015
ISSN:	0006-3088 1336-9563
Megjegyzések:	Natural environments tend to be variable resulting in alternating periods of high and low food availability. Therefore, animals have to be able to accommodate to sudden environmental changes by adjusting their physiology and behaviour to new conditions. We investigated how simulated food variability affects life history traits (asexual reproduction and stress tolerance) and response to environmental change in laboratory experiments with green hydra (Hydra viridissima). We assigned hydra into four groups differing in feeding frequency (high or low) and food regularity (random or stable). After 21 days of accommodation, feeding frequency was changed (increased or decreased) in half of each group, the other half was kept as a control group. Hydra showed a delayed response to environmental change (increased or decreased feeding frequency). This delay in response was greater under an unpredictable feeding scheme. Animals on a random scheme had lower budding rates and lower stress tolerance. Follow-up experiments suggest that this might be due to receiving food on subsequent days, since we found that animals fed daily have lower budding rates than those fed on alternate days. We hypothesize that frequent feeding might cause high levels of oxidative/xenobiotic stress which could overwhelm the defence system of these animals.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk asexual reproduction environmental variability phenotypic flexibility life history trade-offs stress tolerance
Megjelenés:	Biologia. - 70 : 10 (2015), p. 1366-1375. -
További szerzők:	Bradács Flóra Tökölyi Jácint (1984-) (biológus)
Pályázati támogatás:	SROP-4.2.2.B15/1/KONV-2015-0001 Egyéb
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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