the causes of tiger poaching :
tigers are suspected of having been killed and sold
people are killing tigers to get some money
people are killing tigers to take the bone, is use for medical
the chinese black-market is about two products skins and bones

the effects of tiger poaching :
tiger population can appear stable yet fail to withstand an unexpected disaster, such as bad weather, disease, or reproductive problems, authors note
poaching can reduces genetic diversity, which makes the population loss robust
the population of tigers is decrease

the possible solutions :
trying to stop poaching is the almost total reliance on one policy to curb it
bust one conspiracy or monitor one route into a country, and the smugglers will give up