The conservation agency said it broke the birds directive's rules which forbid hunting species that have an "unfavourable conservation status" or "very low population levels".
"Due to the low population levels observed in certain sectors, improving the habitat will not be enough to reverse the downward trend," says an official with the wildlife and hunting agency.
Low population levels of other species can cause the chance loss of genes important to the ongoing coevolution of other interactions.
While we often associate human migrations with the distress of overcrowding, famine or warfare, the hunter-gatherers who arrived in America left lands with low population levels and no apparent conflict.
He adds that it's important to consider the effect of climate when researchers and policy-makers set limits on modern fisheries; for instance, a climate-prompted rebound in salmon population could mask low population levels that are still unhealthy, he says.
The main disadvantage to using populations of large vertebrates as a carbon management tool is that, while humans may be responsible for their low population levels, there are often limited options for accelerating the rebuilding of these populations.
Thus, in many areas, orangutans had already become extinct or reduced to very low population levels by the time of the first orangutan distribution assessments in the 19th century.
