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four fish or mussel species that are native to the great lakes
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- why are native freshwater mussels are an important part of great lakes ecosystemA key feature of estuaries is: low light conditions and high productivity salt water and fresh water frequent algal blooms little or no vegetationIguana Decline In 1987, Martin Wikelski began a long-term study of marine iguanas in the Galpagos Islands. He marked iguanas on two islandsGenovesa and Santa Feand collected data on how their body size, survival, and reproductive rates varied over time. He found that because iguanas eat algae and have no predators, deaths usually result from food shortages, disease, or old age. In January 2001, an oil tanker ran aground and leaked a small amount of oil into the waters near Santa Fe. FIGURE 44.3 shows the number of marked iguanas that Wikelski and his team counted in their study populations just before the spill and about a year later. FIGURE 44.3 Shifting numbers of marked marine iguanas on two Galpagos islands. An oil spill occurred near Santa Fe just after the January 2001 census (orange bars). A second census was carried out in December 2001 (green bars). How much did the population size on each island change between the first and second census?
- Iguana Decline In 1987, Martin Wikelski began a long-term study of marine iguanas in the Galpagos Islands. He marked iguanas on two islandsGenovesa and Santa Feand collected data on how their body size, survival, and reproductive rates varied over time. He found that because iguanas eat algae and have no predators, deaths usually result from food shortages, disease, or old age. In January 2001, an oil tanker ran aground and leaked a small amount of oil into the waters near Santa Fe. FIGURE 44.3 shows the number of marked iguanas that Wikelski and his team counted in their study populations just before the spill and about a year later. FIGURE 44.3 Shifting numbers of marked marine iguanas on two Galpagos islands. An oil spill occurred near Santa Fe just after the January 2001 census (orange bars). A second census was carried out in December 2001 (green bars). Wikelski concluded that changes on Santa Fe were the result of the oil spill, rather than sea temperature or other climate factors common to both islands. How would the census numbers be different from those he observed if an adverse event had affected both islands?Figure 19.6 If the major food source of seals declines due to pollution or overfishing, which of the following would likely occur? a. The carrying capacity of seals would decrease, as would the seal population. b. The carrying capacity of seals would decrease, but the seal population would remain the same. c. The number of seal deaths would increase, but the number of births would also increase, so the population size would remain the same. d. The carrying capacity of seals would remain the same, but the population of seals would decrease.Monotremes include: kangaroos koalas bandicoots platypuses.
- The number of currently described species on the planet is about ________. a. 17,000 b. 150,000 c. 1.5 million d. 10 millionWhich of the following is a Monotreme? a. kangaroo b. koala c. bandicoot d. platypusThe type of place where a species typically lives is called its _______. a. niche c. community b. habitat d. population
- Exotic species are especially threatening to what kind of ecosystem? deserts marine ecosystems islands tropical forestsExplain what extinction threats a frog living on a mountainside in Costa Rica might face.Figure 47.16 Which of the following statements is not supported by this graph? There are more vulnerable fishes than critically endangered and endangered fishes combined. There are more critically endangered amphibians than vulnerable, endangered and critically endangered reptiles combined. Within each group, there are more critically endangered species than vulnerable species. A greater percentage of bird species are critically endangered than mollusk species.
