Gause said that whenever you've got two similar species competing for the exact same limited resources, one of them will have some sort of advantage-however slight- that'll eventually enable this species to dominate and ultimately exclude the other one ...even cause it to become extinct.

教授: 高斯说，不论何时都存在两个相似的物种竞争同样的有限资源，其中的一个物种会占据一些优势，无论这个优势开始的时候多么小，最终都会导致这个物种占据优势地位，最终排挤掉另一种物种，甚至可能导致另一个物种灭绝。

FEMALE PROFESSOR: Now, one of the early criticisms of Gause's hypothesis was that, "Sure, it works in simple lab experiments, where you have just two competing species in a controlled environment.

教授: 对于高斯假设的早期批评之一是: “当然了，这个假设在简单的实验环境里是有作用的，在一个可控的环境里，只存在两种竞争关系的物种

FEMALE PROFESSOR: And right in the same area you've got five species of warbler, all about the same size, and all having similar diets of insects-insects that are found on and around trees.

教授: 在相同的区域里，你会发现五种wobbler，都是相同大小，吃相同种类的昆虫，这些昆虫生活在树上或者树木周围。

EMALE PROFESSOR: Yes, an-and there are many ways to do that- the dominant species feeds in one part of the tree, and you feed in another...

教授: 是的，有很多种办法可以做到，强势物种以树木的某一部分为食，弱势物种可以以另一部分为食。

MALE STUDENT: If the dominant species needs lots of water, you develop the ability to survive on very little water...

学生: 如果强势物种需要很多水资源，弱势物种可以发展靠很少水存活的能力。

Para35

FEMALE PROFESSOR: You survive on what's left over. Water, food, nesting or breeding sites,... whatever.

教授: 弱势物种依靠强势物种残留下来的资源而活:水资源，食物，筑巢或者育儿地，或者是别的什么。

请问，前面三个you've got or you have可以理解成there have吗？

后面三个you是弱势物种，如果可以，为什么you可以这样用？没有在字典中找到