Its rarity is essentially due to habitat decline and overfishing. The species is a crucial indicator of river ecosystem well being, highlighting the necessity for conservation. 其次，旅游业的发展导致了三亚城市化进程的加速。随着越来越多的酒店、度假村、商场等设施的建设，土地资源的使用变得越来越密集，许多原本属于生态保护区的区域被开发成了旅游项目。这不仅加剧了环境污染和资源消耗，也破坏了... https://share.evernote.com/note/a7578a86-f13b-2e73-7f53-5a92577bd5ec