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Nature and how it works fascinates me. Presently Studying a diploma in Nature Conservation. Outdoors, photography and having fun is all me.
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I think your emotions are clouding your judgement here a little Despina, and I don't blame you. But please understand that it is necessary to take these birds out of the sensitive systems so that other species will not be outcompeted and lost to their natural environment. The person's responsible are not exterminating everything in their sites, they are only targeting specific species for the sake of many species.
That is the risk of a bio-control method, and obviously no consideration for the food web. Removal weather it being the extermination or the relocation of the Indian Myna is however the issue here. I agree with both of you here, extermination is cruel and not fair as it is the fault of humans, but the cost implications of translocations are just not feasible. This is sadly the choices we must make, and conservation becomes an ongoing contentious issue.
Sometimes solutions can be a very sensitive issue, I agree with the matter of ethics when taking a life, but in circumstances where it threatens multiple ecosystems and possible local extinctions of indigenous species the decision becomes an extremely important one. Even within invasive tree species, the degrading impact they have on the environment and habitats means that biodiversity, which is the core of conservation, is at a loss. The solution ultimately being that that species needs to be removed from that system. Sadly these scenarios are due to human error and ignorance without any foresight in the matter, and it is the responsibility in the end for humans to attempt to correct the problems in light of the much bigger picture as Johan pointed out.