Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
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Chapter 44.2, Problem 1TYK
Summary Introduction
Introduction:
A community is a group of species existing in the similar habitat or having a particularly common feature. Community is also termed as a biological community. For example, soil containing
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In some marine habitats in New England, the population density of lobsters has been depleted due to heavy fishing. When this happens, it often follows that the diversity of species in the biological communities is reduced. Based on this observation, how would you characterize lobsters?
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Rabbits can eat many plants, but they prefer some plants over others. Assume that the rabbits in a grassland community containing many plant species prefer to eat a species of grass that happens to be a superior competitor. If the rabbits are removed from the region, predict whether relative species abundance will increase or decrease, and whether species richess will increase or decrease.
Chapter 44 Solutions
Principles of Biology
Ch. 44.1 - Prob. 1CCCh. 44.1 - Prob. 1TYKCh. 44.1 - Lake Baikal in Siberia is an ancient, unglaciated...Ch. 44.1 - Prob. 3TYKCh. 44.2 - Prob. 1TYKCh. 44.2 - Prob. 2TYKCh. 44.3 - Why might ecologists think of walking thecoastline...Ch. 44.3 - Prob. 2CCCh. 44.3 - Which of the following are examples of secondary...Ch. 44.3 - In New England salt marshes, Spartina grass...
Ch. 44.3 - Prob. 3TYKCh. 44.4 - Prob. 1CCCh. 44.4 - Prob. 1BCCh. 44.4 - Prob. 2CCCh. 44.4 - Which is part of the original MacArthur-Wilson...Ch. 44.4 - Prob. 2TYKCh. 44.5 - In these two food chains, plants and...Ch. 44.5 - Prob. 1CCCh. 44.5 - Prob. 1TYKCh. 44.5 - Detritivores that feed on the dung of herbivores...Ch. 44.5 - Prob. 3TYKCh. 44.6 - Net primary production is the energy that passes...Ch. 44.6 - Prob. 2TYKCh. 44.6 - Most gross primary production is used in (by)...Ch. 44 - Prob. 1TYCh. 44 - Prob. 2TYCh. 44 - Prob. 3TYCh. 44 - Prob. 4TYCh. 44 - On which types of islands would you expect species...Ch. 44 - Prob. 6TYCh. 44 - Autotrophic organisms are primary consumers....Ch. 44 - Prob. 8TYCh. 44 - Prob. 9TYCh. 44 - The most highly productive terrestrial ecosystems...Ch. 44 - Prob. 1CCQCh. 44 - Prob. 2CCQCh. 44 - Prob. 3CCQCh. 44 - List some possible ecological disturbances, their...Ch. 44 - Prob. 2CBQ
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- Fig. 1: A subset of a simple food web from a typical oak-maple forest ecosystem from Midwest Gray fox Cooper's hawk Red tailed hawk Fox Robin Gray squirrel Chipmunk Vole squirrel Grasshopper Oak Maple Grass Fig. 2: Four types of indirect interactions| 1. Apparent competition: Negative effect of one species on another via"shared predator": (+x(-) = (-) 3. Trophic cascade: The indirect effect of top predator on the lower Gray fox trophic via "intermediate species". Three trophic [(-) x (-)) = (+), four trophic [(-)X(-)X(-)=(-)) FOx squirrel Gray Squirrel Green world Brown world (-) X (-)=(+) (-)X(-)X(-)=(-) Fox squirel Gray Squirrel 4. Indirect mutualism: A positive indirect effect of two predators on each other via distinct prey that compete: (-)X(-X(+)%3D(%) Gray squirrel Chipmunk 2. Resource Competition: Negative effect of one species on another via "shared resource" : (-) x (+) = (-) Oak Oàk Мaplearrow_forwardSupport this with evidence: In this food web model, plants A, B and C are the autotrophic organisms that serve as the producers of the food web model. The herbivores A, B and C serve as the primary consumers meanwhile the omnivores A and B serve as the secondary consumers of this model. Then, the last level is the top predator. To describe the model formulated, the populations of these organisms, in a particular ecosystem, was recorded over a period of 61 days. It is observed that at Day 0, the plant populations are the highest, which is around 5000. The herbivore populations are found in a range of 2000-3000 and the omnivore populations can be seen to be below 1000. With gradual increase in the number of days, we can see here that the food chain is coming into play. The green plants are being consumed by the herbivores, leading to fluctuations in the plant populations. The herbivores are, in turn, being consumed by the omnivores. We can see that with increasing time, only…arrow_forwardPredation, disease, and competition are examples of _______________ factors. (a) density-dependent (b) density-independent (c) survivorship (d) dispersal (e) semelparousarrow_forward
- A limiting resource does all the following except that it (a) tends to restrict the ecological niche of a species (b) is in short supply relative to a species need for it (c) limits the presence of a species in a given community (d) results in an intermediate disturbance (e) may be limiting for only part of an organisms life cyclearrow_forwardThe _______________ signifies that species richness is greater where two communities meet than at the center of either community. (a) edge effect (b) fundamental niche (c) character displacement (d) realized niche (e) limiting resourcearrow_forwardINTERPRET DATA Examine the top and middle graphs in Figure 54-5. Are these examples of exponential or logistic population growth? Where is K in each graph? (You may need to refer to Chapter 53 to answer these questions.) RESULTS AND CONCLUSION: The top and middle graphs show how each species of Paramecium flourishes when grown alone. The bottom graph shows how they grow together, in competition with each other. In a mixed culture, P. aurelia outcompetes P. caudatum, resulting in competitive exclusion. SOURCE: Adapted from G.F. Gause, The Struggle for Existence (Williams and Wilkins, Baltimore, 1934). Figure 54-5 G.F. Gauses classic experiment on interspecific competitionarrow_forward
- True or false? Grasslands are quick to develop into a climax community.arrow_forwardSince 1972, Dr. Jim Estes had been studying a food chain of kelp -> urchins -> sea otters, and then in the early 1990s orcas began eating the sea otters. The data collected by Dr. Estes are shown. Panel A shows sea otter abundance around four different islands from 1972 to 1997. Panel B shows the amount of sea urchins (sea urchin biomass) in 1987 and 1997. Panel C shows the amount of kelp that sea urchins ate over a 24- hour period (grazing intensity) in 1991 and 1997. Panel D shows the number of kelp plants within a specific area (density of kelp) in 1987 and 1997. The thickness of the arrows illustrates the strength of the effect one species has on the species below it in the food web. Sea otter abundance -Amchitka L N. Adak I. Kagalaska i. L Riskal. Sea urchin biomass Grazing intensity Total kelp density 1972 1985 1989 1993 1997 Year In 1997, which species is the apex predator in the food chain? No. per 0.25 m % loss 24hr gms 0.25m Otter No. (% max. count)arrow_forwardWhich of the following attributes of a community would tend to lead to higher species richness? High specialization of species A broad resource spectrum High population size in each species Both a and b Both b and carrow_forward
- Insect communities were surveyed in either the high or low canopy of a tropical forest. The community data are displayed in the table below. In which habitat was there higher species diversity? Low Canopy_ High Canopy Species Abundance P, P, In P, Species Abundance Pi P, In P 1 45 0.45 -0.36 1 50 0.50 -0.35 35 0.35 -0.37 2 25 0.25 - 0.35 20 0.20 -0.32 3 25 0.25 - 0.35 Total 3 100 1.0 3 100 1.0 O a. cannot be determined with the available data O b. high canopy O c. high and low canopy have the same species diversity O d. low canopy has a higher species richness Oe. low canopyarrow_forwardWhich of the following statements is/are consistent with the Intermediate disturbance hypothesis? Species diversity is maximized in areas that experience high levels of disturbance Areas with low levels of disturbance will be dominated by K selected species Decades of suppression in California has likely increased diversity in our national forests Areas with intermediate levels of disturbance will have the lowest levels of diversityarrow_forwardSpecies richness of many taxa (birds, trees, etc.) increases from the poles to the equator. Ecologists do not know exactly why, but the following idea(s) is/are well supported by evidence: Question 11 options: - The warmer climates of the tropics have longer growing seasons, more primary productivity and more benign climates which produce a larger resource base for more species and may increase specialization. - Polar and temperate regions have had to “start over” many times after successive glaciations, so species have had to re-colonize those areas. - Extinction rates are lower in tropical areas than temperate areas. --- First and Second Answers are BOTH true. --- Second and Third Answers are BOTH truearrow_forward
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