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Effects of UV-B radiation and simulated herbivory on phlorotannins in the brown alga Ascophyllum nodosum
The results imply that phlorotannins can function as inducible screens against harmful UV radiation, supporting the notion that small marine herbivores in general are tolerant to chemical defenses of algae.
INDUCIBLE CHEMICAL RESISTANCE TO HERBIVORY IN THE BROWN SEAWEED ASCOPHYLLUM NODOSUM
The results suggest that grazing by L. obtusata can be an important factor in explaining natural phenotypic variation in the phlorotannin content of Ascophyllum, and support the previously proposed hypothesis that it is feeding by relatively small, less mobile herbivores that is most likely to cue for induced production of defense chemicals in seaweeds.
Habitat and feeding preferences of crustacean mesoherbivores inhabiting the brown seaweed Ascophyllum nodosum (L.) Le Jol. and its epiphytic macroalgae
The general conclusion of this study was that macroepiphytes are important as habitat and food for some of the crustacean mesoherbivores inhabiting A. nodosum, but that large variations in mesohersbivore–epipHYte interactions occur among and within species.
Water-borne cues induce chemical defense in a marine alga (Ascophyllum nodosum).
- Gunilla B. Toth, H. Pavia
- Biology, MedicineProceedings of the National Academy of Sciences…
- 19 December 2000
It is shown that water-borne cues from actively feeding herbivorous gastropods, flat periwinkles (Littorina obtusata), can serve as external signals to induce production of defense chemicals (phlorotannins) in unharmed individuals of seaweeds, knotted wrack, and that the increased levels ofDefense chemicals deter further feeding by periwinkle attacks.
Copepods induce paralytic shellfish toxin production in marine dinoflagellates
- E. Selander, P. Thor, Gunilla B. Toth, H. Pavia
- Biology, MedicineProceedings of the Royal Society B: Biological…
- 7 July 2006
It is shown that waterborne cues from the copepod Acartia tonsa induce paralytic shellfish toxin (PST) production in the harmful algal bloom-forming dinoflagellate Alexandrium minutum.
Formation of harmful algal blooms cannot be explained by allelopathic interactions
- P. Jonsson, H. Pavia, Gunilla B. Toth
- Biology, MedicineProceedings of the National Academy of Sciences
- 7 July 2009
It is concluded that there is no experimental support for allelopathy at prebloom densities, throwing doubts on allelopathic as a mechanism in bloom formation and it is suggested that the evolution of allelelopathy under field conditions may be unlikely even if based on cell–cell interactions.
Extrinsic factors influencing phlorotannin production in the brown alga Ascophyllum nodosum
The results of this study support the induced defence model (IDM), but not the carbon-nutrient balance model (CNBM), in explaining intraspecific variation in the phlorotannin content of A. nodosum, and support the previously proposed hypothesis that phlorOTannins play a role as inducible screens against harmful UV radiation.
Influence of light and nitrogen on the phlorotannin content of the brown seaweeds Ascophyllum nodosum and Fucus vesiculosus
The results imply that nitrogen availability explains some of the natural variation in the phlorotannin content of F. vesiculosus, but the light environment has greater importance than nitrogen availability in predicting the phlootannIn content of each species.
Induced herbivore resistance in seaweeds: a meta‐analysis
It is shown that induced resistance in seaweeds is more common than previously assumed and the scientific value of future investigations concerning induced defences in marine algae would benefit from formulating more advanced and/or complex hypotheses including the genetic and biochemical mechanisms, cost and constraints of damage-induced civilian and defensive seaweed responses.