Response of green hydra (Hydra viridissima) to variability and directional changes in food availability
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Márta E. Rosa
,
Flóra Bradács
Abstract
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.
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Articles in the same Issue
- An overview of phytochrome: An important light switch and photo-sensory antenna for regulation of vital functioning of plants
- A novel GH13 subfamily of α-amylases with a pair of tryptophans in the helix α3 of the catalytic TIM-barrel, the LPDlx signature in the conserved sequence region V and a conserved aromatic motif at the C-terminus
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- A new species of the genus Aeolothrips (Thysanoptera: Aeolothripidae) from Iran
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Articles in the same Issue
- An overview of phytochrome: An important light switch and photo-sensory antenna for regulation of vital functioning of plants
- A novel GH13 subfamily of α-amylases with a pair of tryptophans in the helix α3 of the catalytic TIM-barrel, the LPDlx signature in the conserved sequence region V and a conserved aromatic motif at the C-terminus
- Biogenic synthesis of silver nanoparticles using cell-free extract of Bacillus safensis LAU 13: antimicrobial, free radical scavenging and larvicidal activities
- Understanding taxonomic position of local endemic Agropyron deweyi (Poaceae) using morphological characters and sequences of nuclear and chloroplast DNA regions
- Genetic status of the putative hybrid swarms of mountain dwarf pine and Scots pine in contact zones of their distribution in Slovakia
- Species delimitation and population structure in three Onosma (Boraginaceae) species
- Glycinebetaine priming improves salt tolerance of wheat
- The effect of nitrogen level on rice growth, carbon-nitrogen metabolism and gene expression
- High efficiency Agrobacterium-mediated transformation of Pinellia ternata using petiole explants from submerged cultures
- Cryopreservation of Serbian autochthonous Prunus spp. by droplet-vitrification
- Response of green hydra (Hydra viridissima) to variability and directional changes in food availability
- Data on some members of the family Tylenchidae (Nematoda: Tylenchina) from Iran
- New and firstly recorded oribatid mites from Turkey
- Reproductive parameters of four species of water mites (Acari: Hydrachnidia)
- A new species of the genus Aeolothrips (Thysanoptera: Aeolothripidae) from Iran
- Skull variability of mice and voles inhabiting the territory of a great cormorant colony
- High glucose-associated osmolality promotes adipocytogenic differentiation of primary rat osteoblasts in a protein kinase A and phosphatidylinositol 3-kinase/Akt-dependent manner
- Direct influence of rooibos-derived compound on rabbit ovarian functions and their response to gonadotropins
- Corrective notice to the European mudminnow (Umbra krameri Walbaum, 1792) record from the Black Sea
