Question
Need help with these for Ecology please and thank you. This is one question, it is the figure and the question.
1.
Concept 15.3 ber of endemic mber of species iven amount of third approach, in the assessed ift from endan- t rates of extinc- pproach is based ge contraction of ll of these meth hey are the best s of biodiversity hen a species is wn from a single f relocating them nt for a very rare populations. De- s been known to e the publication r example, 35 spe- iscovered, though d. The joy of their lization that these rve the same eco- populations, and 342 (A) All species Fossils were used to estimate the number of species on the island 3,000 years ago. 30 20 10 00300-01804 1988 years ago years ago The extinction of 50% or more of the frugivores and nectarivores probably led to changes in the island's plant communities. (B) Guilds Frugivores Omnivores Insectivores Predators species is now cological footprint ter 10) has acceler- er the last century n Earth's biota for ter 3). David Stead- d on Pacific islands up to 8,000 species of were endemic flight- olonized by Polyne- nd endemics, and in sed entire ecological only speculate about ctarivores played in 0 1800s 1988 3,000 years ago 3,000-200 years ago Figure 23.5 Humans Have Been Causing Extinctions for Millennia Trends over time in (A) the total number of bird species and (B) the number of species classified by feeding guild found in the Pacific island 'Eua in the nation of Tonga. Prehistoric extinctions (3,000-200 years ago) occurred on many Pacific islands as a result of hunting and the intro- duction of rats, dogs, and pigs. (After Steadman 1995.) Speculate on reasons why losses of birds that feed on fruit (frugivores) or nectar (nectarivores) may have affected the is- land's plant communities. (Hint: See the discussion of mutual- ism in Concepts 15.1 and 15.2.) 2 9:03 PM 4/16/2018
Explanation / Answer
.There are two lines in the graph of the figure given which shows a steep decline due to human interference, the red line for the frugivores and the orange line for the insectivores. Of these two, frugivores seem to have suffered the most decline. There has been the extinction of more than 50% of the frugivores between 3000-200 years ago to 1800 years ago. Hence, we can conclude that the correct answer here is frugivores.
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