THE WOLF WATCHERS. Endangered gray wolves return to the American West
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1 CHAPTER 7 POPULATION ECOLOGY THE WOLF WATCHERS Endangered gray wolves return to the American West
2 THE WOLF WATCHERS Endangered gray wolves return to the American West Main concept Population size and makeup can fluctuate or remain stable. Population stability is often dependent on predators. When human impact results in reduced predation, we may need to manage the system ourselves. Case Study Yellowstone Gray Wolf Restoration Project
3 THE WOLF WATCHERS Endangered gray wolves return to the American West Case Study Yellowstone Gray Wolf Restoration Project History of decline Humans hunted wolves, destroyed habitat by conversion for agriculture, and hunted wolves food sources elk, deer, and bison. Wolf populations in Yellowstone had also declined as a result of predator control programs. Protected under the Endangered Species Act of 1973 In 1987, 41 wolves were reintroduced and outfitted with radio collars allowing researchers to track the size of wolf packs, their food sources, and movement patterns.
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5 THE WOLF WATCHERS Endangered gray wolves return to the American West Populations, all the individuals of a species living together in the same area, fluctuate naturally over time. Populations increase with birth and immigration and decrease with death and emigration. Response is often based on access to food, water, nesting sites, and predation. Population dynamics can be predictable or more random. Information from tracking helps aid recovery and plan conservation strategies for wolves and for many other threatened plants and animals.
6 Populations fluctuate in size and have varied distributions TERMS TO KNOW: Population Population dynamics Minimum viable population Doug Smith, Population Biologist Below a minimum number of individuals, a species may not be viable long term. Courtship rituals, flocking, schooling, foraging, and genetic variability are often dependent on population size.
7 Populations fluctuate in size and have varied distributions Successful population density varies by species. Too low and individuals may not be able to find mates or only mates that are closely related. In a population that is too dense, competition, fighting, and disease can become problems. Location and spacing of individuals within a population may be influenced by a variety of factors.
8 Populations fluctuate in size and have varied distributions Social species such as wolves, elk, and prairie dogs provide examples of clumped distribution. Individuals are found in groups within the habitat.
9 Populations fluctuate in size and have varied distributions Individuals are spread out irregularly. Random distribution Species that disperse randomly in an environment like wind-blown seeds that germinate where they land
10 Populations fluctuate in size and have varied distributions Individuals spaced evenly possibly due to territorial behavior or something that suppresses growth. Creosote bushes in the desert are an example of uniform distribution.
11 A variety of factors affect population growth TERMS TO KNOW: Population growth rate Birth rate Death rate Biotic potential (r) Exponential growth Logistic growth Carrying capacity Limiting factors are resources needed for survival but that may be in short supply. This scarcity will determine carrying capacity. Resistance factors, such as predation, competition, and disease, will also contribute to controlling population size and growth. These factors are density-dependent, but other factors such as natural disaster are density-independent since they would occur regardless of the population size.
12 A variety of factors affect population growth Effects of density-dependent factors increase as populations grow. Disease Competition Predation TERMS TO KNOW: Density dependent Density independent Reproductive strategies r-selected species K-selected species
13 A variety of factors affect population growth Effects of density independent factors affect a population, regardless of its size, but can serve to decrease the population. Storm Fire/Flood Avalanche TERMS TO KNOW: Density dependent Density independent Reproductive strategies r-selected species K-selected species
14 P. 168 A variety of factors affect population growth High rate of population increase and well adapted to exploit unpredictable environments Will increase quickly as resources become available
15 A variety of factors affect population growth Low reproductive rates and very responsive to environmental conditions Decrease or increase slowly as resource availability changes
16 A variety of factors affect population growth TERMS TO KNOW: Boom-and-bust cycles Extirpation K-selected species tend to be stable in undisturbed areas. Slow increases and decreases in response to the environment. r-selected species with rapid reproductive potential sometimes have sudden population growth with high peaks which may overshoot carrying capacity followed by sudden crashes. Some populations will level off near carrying capacity while others will continue to overshoot and crash.
17 A variety of factors affect population growth Some populations overshoot carrying capacity, drop below it, and increase and overshoot it again until they settle down close to carrying capacity.
18 A variety of factors affect population growth Example Isle Royale, Michigan Wolves preyed upon moose and the moose population dropped, followed by a drop in the wolf population. As moose populations recovered, so did the wolves until a Parvo epidemic reduced wolves to their lowest point.
19 The loss of the wolf emphasized the importance of an ecosystem s top predator Black line shows winter browse line from herbivores Populations do not exist in isolation. Like the Yellowstone example demonstrates, the addition of a keystone species like the wolf can result in observable changes in the behavior of its prey. Cascading effects on other community level processes may follow.
20 The loss of the wolf emphasized the importance of an ecosystem s top predator Without wolves, beavers thrive and build dams that create lakes and ponds. Elk stay in the willow thickets and overgraze willow needed by the beavers.
21 The loss of the wolf emphasized the importance of an ecosystem s top predator With wolves, willows regrow because elk feed in the meadows, where they can watch for wolves rather than in the willow thickets. With more willows, beavers return and the wildlife populations recover.
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