You study a population of mussels recently introduced to a section of the Rideau River 8 years ago. You know that 20 mussels were originally let go in the river by a resident. These mussels have no predators. You know from your research that, under ideal conditions, the instantaneous rate of increase of this mussel species is 0.20. You also think the conditions on the river were ideal when the mussels were introduced. After surveying the food available in the river, you estimated that there is enough food to support a population of 12,900 mussels. How many mussels do expect to be in the river now?
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- You study a population of snails recently introduced to a small lake 10 years ago. You know that 7 snails were originally let go in the lake by a cottager. The lake has no snail predators nor any other species occupying the same or a similar ecological niche. You know from your research that, under ideal conditions, the instantaneous rate of increase of this snail species is 0.5. You also think the conditions on the lake were ideal when the snails were introduced. After surveying the food available in the lake, you estimated that there is enough food to support a population of 1696 snails. How many snails do expect to be in the lake now?In Glacier Sea over the past 5 years the moon jelly population has been INCREASING. How will the walleye pollock population be affected?A small number of lizards are introduced to an island. Their native habitat is a forest and they mostly live in trees. The island has few trees and the lizards spend most of their time on the ground where they are eaten by snakes. Over many generations the island population of lizards develop shorter toes and longer legs which allow them to run faster on bare ground. The lizards withe longest legs/shortest toes are the least likely to be caught be snakes. After several decades lizards are collected from the island and placed in enclosures. Lizards from the original forest habitat are placed in identical enclosures. Each type of lizard mates and has offspring. The offspring resemble their parents and the offspring of island lizards have shorter toes/longer legs than offspring of forest lizards (i.e the differences you see in nature are also found in a lab setting). This is an example of Group of answer choices a. both natural selection and evolution b. evolution only c.…
- The Atlantic cod population is of primary economic importance to fishingcommunities throughout the maritime provinces in Canada. Unfortunately, thispopulation has underwent an extreme collapse in recent years due to overfishing.Some argue, however, that the collapse of the cod population may actually beattributed to an increase in the population of harp seals, a known predator ofcod. One suggestion to help cod stocks recover is therefore to permit the huntingof harp seals on a large scale. Suggest and explain one potentially negativeconsequence of limiting the harp seal population.A severe winterkill seemingly killed all the trout in a lake. A decision is made to restock the lake with trout from a nearby lake. The carrying capacity of the stocked lake is estimated at 11,500 trouts and the instantaneous rate of increase of the species is estimated at 0.006. If the lake is stocked with 800 trout, how many trout will be in the lake after 55 years. Round your answer to the closet full number.Suppose we removed whelks from the intertidal community. Predict the effect (increase, decrease, no change) on the population sizes for each of the following species. It is important to consider indirect effects. For each of the small gray arrows, you can consider that effect negligible and treat it as a neutral (0) effect. coral weed sea stars + acorn barnacles mussels gooseneck barnacles. nori seaweed + chiton mussel ochre sea star nori seaweed [Choose ] [Choose ] [Choose ] [Choose ] [Choose ] acorn barnacle black pine gooseneck barnacle
- On the Bahamian island of Andros, mosquitofish populations live in various, now-isolated, freshwater ponds that were once united. Currently, some predator-rich ponds have mosquitofish that can swim in short, fast bursts; other predator-poor ponds have mosquitofish that can swim continuously for a long time. When placed together in the same body of water, the two kinds of female mosquitofish exhibit exclusive breeding preferences. If one builds a canal linking a predator-rich pond to a predator-poor pond, then what type(s) of selection should subsequently be most expected among the mosquitofish in the original predator-rich pond, and what type(s) should be most expected among the mosquitofish in the formerly predator-poor pond? stabilizing selection; directional selection stabilizing selection; stabilizing selection less-intense directional selection; more-intense directional selection less-intense disruptive selection; more-intense…Which of the following best describes bycatch? a. dividing catch of marine life among fishing boats b. bonus catch of marine life, such as increased numbers of intended catch c. unintentional catch of nontarget marine life in fishing gear d. catching too much of a target species of fishLake Winnipeg is a shallow lake composed of two basins: a wide north basin and a narrow southbasin that provides a habitat for over 50 different species of fish. Each of the statements belowinvolves a situation that will affect the growth of a population. Classify each of the statements asDD (density dependent) or DI (density independent) and give a reason for your choice.1. Rainbow smelt and yellow perch attempt to occupy the same area. The more aggressive smeltsurvive; the perch do not. __________________________________________________2. A severe flood brings a lot of sediment and silt into Lake Winnipeg. The turbidity of the lakeincreases greatly. ________________________________________________________3. Since northern pike prey on yellow perch, an increase in the perch population causes anincrease in the pike population. _______________________________________________4. Many fish die due to an increase in water…
- Grizzly bears are predators of salmon. If the population of grizzlies in an area decreases, the salmon population would grow very large and cause a decrease in available habitat and food for other fish species. In this example the grizzly bear is aPart A: A population of 100 Asian elephants exhibits logistic growth. If the carrying capacity is 500 elephants and theper capita growth rate is 0.1 individuals/(individuals × year), what is the maximum population growth rate forthe population? part b: Based on the above question, what is the maximum population growth rate for the population if we assumedthe elephants were undergoing exponential growth?Plasmodium is a vector for mosquitos. It is a protozoan that is the causal agent of malaria, which is responsible for killing as many 855,000 people in 2013, the majority of them being children. Populations of mosquitos are strongly influenced by the availability of standing water for egg-laying and larval development. How might mosquito density, and thereby human mortality, be affected by patterns of rainfall?