There is another debate concerning whether conservationists should be tasked with removing Ragwort (primarily Senecio jacobaea). It is designated as a 'weed' (the 'Root out Ragwort' campaign) that must be removed. It is the only food of the larva of day-flying Cinnabar moth (Tyria jacobaeae) which advertises its poisonous nature to birds with its distinctive red and black colouration. The reason it is poisonous is that its larvae (also distinctively coloured and grouped on the food plant) incorporate toxins (pyrrolizidine alkaloids) produced by the Ragwort to protect it from herbivores. The larvae are grouped as ingestion of one caterpillar will cause its kin to be avoided by predators.The reason Ragwort is banned from many locations is that its glycoside can kill horses, ponies and cattle by damaging their hearts and livers. Like most of conservation, it's a question of which organisms you favour and why. Different people will have different answers to these kind of conundrums.
This blog may help people explore some of the 'hidden' issues involved in certain media treatments of environmental and scientific issues. Using personal digital images, it's also intended to emphasise seasonal (and other) changes in natural history of the Swansea (South Wales) area. The material should help participants in field-based modules and people generally interested in the natural world. The views are wholly those of the author.
Wednesday, 14 August 2019
The Ragwort Dilemma
There is another debate concerning whether conservationists should be tasked with removing Ragwort (primarily Senecio jacobaea). It is designated as a 'weed' (the 'Root out Ragwort' campaign) that must be removed. It is the only food of the larva of day-flying Cinnabar moth (Tyria jacobaeae) which advertises its poisonous nature to birds with its distinctive red and black colouration. The reason it is poisonous is that its larvae (also distinctively coloured and grouped on the food plant) incorporate toxins (pyrrolizidine alkaloids) produced by the Ragwort to protect it from herbivores. The larvae are grouped as ingestion of one caterpillar will cause its kin to be avoided by predators.The reason Ragwort is banned from many locations is that its glycoside can kill horses, ponies and cattle by damaging their hearts and livers. Like most of conservation, it's a question of which organisms you favour and why. Different people will have different answers to these kind of conundrums.
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1 comment:
It's not a matter of either/or. Proper implementation of RW/ Weeds Acts alongside
Wildlife+Countryside Act could keep most people happy. The ragwort code of practice only supports control in very specific circumstances, some argue risk distances but even these are judged bearing in mind local conditions.
https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/801153/code-of-practice-on-how-to-prevent-the-spread-of-ragwort.pdf
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