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Flies see motion. When the monitor screen changes, the visible spectrum of the pixel is changing and nothing is moving. Flies have limited color vision. Each color has its own wave frequency, but flies have only two kinds of color receptor cells. This means they have trouble distinguishing between colors, for instance discerning between yellow and white. ...


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Most species of Eel (order Anguilliformes) have a semelparous life history, i.e. they only reproduce once and then die (as opposed to an iteroparous life history). Many species are now threatened by extinction (e.g. American eel and European eel), since they have been heavily exploited by fisheries and they are also vulnerable to habitat modifications (e.g. ...


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Minimum viable population (MVP) can be predicted in two ways. Computer simulations. Population viability analyses (PVA) PVA is considered generally more common practice by ecologists and without a reference to the 1600 panda population you mention, my guess would be that this is what they did. PVAs work well for endangered species prediction. A ...


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The data used in the graph you posted seems to be from Bambach. 2002. Supporting predators: changes in the global ecosystem inferred from changes in predator diversity (in Kowalewski & Kelley. The Fossil Record of Predation) - see fig 19b - and, if so, is specifically dealing with marine predators. I don't have time to look at that paper closely (it is ...


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Biologists are certainly not afraid to exterminate pests and plagues in the wild. See: smallpox and polio. However, such exterminations are nearly impossible and very expensive. See: smallpox and polio. In both cases extinction is through extensive vaccination, preventing the disease from having any hosts to live in. To achieve this you need to vaccinate a ...


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I think you will see mainly opinion based answers without giving anymore specifics. Here is a succinct insight into why the biologist should have been hesitant to wipe out a pest. Generally, removing a pest on a massive scale would alter the ecosystem irreversibly so should only be done in extreme circumstances. Conservation matters. Why conservation is ...


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The percentage of biomass at each stage will vary tremendously, based on the following factors: 1: Relative turnover rate of the biomass. When biomass turnover is very high (for example in plankton and whales), it is possible for whale biomass to exceed that of the plankton, even through the whales feed on plankton. Therefore, it is better to use a pyramid ...


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The largest area of temperate rain forest in the world is on the west coast of North America, which has a summer dry season. In other words, at precisely what would be the best time for plants to grow (based on temperature), there's a shortage of water. (Summer vacation visitors to the rain forests on the Olympic Peninsula are often wondering "where's the ...



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