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Animal Ecology & Conservation. Donald Winslow, Zoology 25 January 2008. Ecology (Ernst Haeckel). An organism’s relationship to its biotic and abiotic environment. Ecologists study factors that affect spatial distribution and abundance of organisms. Biological hierarchy. Cell Tissue Organ

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Animal ecology conservation

Animal Ecology & Conservation

Donald Winslow, Zoology

25 January 2008


Animal ecology conservation

Ecology (Ernst Haeckel)

  • An organism’s relationship to its biotic and abiotic environment.

  • Ecologists study factors that affect spatial distribution and abundance of organisms.


Animal ecology conservation

Biological hierarchy

  • Cell

  • Tissue

  • Organ

  • Organ system

  • Organism

  • Population

  • Community

Nine-banded armadillo


Animal ecology conservation

Ecological hierarchy

  • Organism

  • Population

  • Community

  • Ecosystem

  • Landscape

  • Biome

  • Biosphere

Agricultural corridor within forested landscape in southern Indiana.


Animal ecology conservation

A population

American coots (Fulica americana) at Lake Thunderbird. Photo by Zac Ottis


Animal ecology conservation

A community

Ruddy Ducks and Eared Grebes at Great Salt Plains Lake


Animal ecology conservation

An ecosystem

(biotic and abiotic components interacting)

Coast Live Oak forest at Camp San Luis Obispo, California


Animal ecology conservation

A landscape

Coastal oak woodland and chaparral at Camp San Luis Obispo in California


Animal ecology conservation

A biome

Sonoran desert near Phoenix, Arizona


Animal ecology conservation

Broad fields in ecology

  • Physiological ecology

  • Population ecology

  • Community ecology

  • Ecosystem ecology

  • Landscape ecology

  • Biogeography


Animal ecology conservation

Physiological ecology

  • Energy budgets

  • Endothermy

    • Metabolic thermoregulation (bird or mammal)

  • Ectothermy

    • Behavioral thermoregulation (e.g. reptile)


Animal ecology conservation

Population ecology

  • Demes and metapopulations

  • Demographic parameters

  • Population dynamics and regulation

    • Role of resources

  • Metapopulation dynamics

    • sources & sinks


Animal ecology conservation

A metapopulation

Sink

Source


Animal ecology conservation

Demographic parameters

  • Population abundance and density

  • Age structure

  • Sex ratio

  • Growth rate

  • Survivorship


Animal ecology conservation

Age structures of human populations in Afghanistan and Belgium

From Hickman, et al. 2006. Integrated Principles of Zoology, 13th ed., McGraw-Hill, New York.


Animal ecology conservation

Exponential and logistic models of population growth

From Hickman, et al. 2006. Integrated Principles of Zoology, 13th ed., McGraw-Hill, New York.


Animal ecology conservation

Community ecology

  • Species interactions

    • Competition

      • Niche, tolerance ranges, habitat

    • Predation & parasitism

      • Models & mimics

      • Keystone species—starfish & mussels

  • Species diversity


Animal ecology conservation

Ecosystem ecology

  • Gross and net productivity

  • Trophic levels and food webs

  • Producers, consumers, decomposers


Animal ecology conservation

Conservation Biology

  • Defining conservation biology

  • Valuation of biodiversity

  • Threats to biodiversity

  • Solutions for conservation challenges

  • Sustainability

    • Living in ways that do not degrade resources on which future generations depend, allowing civilization to persist.


Animal ecology conservation

Defining Conservation Biology

  • The natural world

  • World ecosystems

  • Biodiversity conservation

  • History of conservation biology


Animal ecology conservation

Valuation of Biodiversity

  • Extrinsic values

    • Economic uses of species

    • Medical uses of species

    • Genetic resources

    • Ecosystem services

  • Intrinsic value


Animal ecology conservation

Threats to biodiversity

  • Human population growth

  • Human industry and resource use

  • Extinction of species

  • Loss of genetic diversity

  • Habitat change

  • Overexploitation

  • Invasive species & disease

  • Climate change


Animal ecology conservation

Habitat change

  • Habitat destruction

  • Habitat degradation

  • Fragmentation


Animal ecology conservation

Habitat destruction

  • Primary cause of biodiversity loss

  • 80+% of threatened species affected by habitat destruction or degradation

  • A decrease in habitat availability decreases the number of breeding territories and thus population productivity.


Animal ecology conservation

Destruction vs. degradation

  • Destruction: Changed to such an extent that one or more ecological populations can no longer use the habitat.

  • Degradation: Habitat still used, but individuals have lower fitness and populations reduced viability.


Animal ecology conservation

Habitat fragmentation—loss of contiguity as well as area.


Animal ecology conservation

Neotropical Migrant Birds

Winter in tropics in Central and South America.

Breed in temperate North America during the spring & summer.

Long-term continental declines have been observed in a number of species.


Animal ecology conservation

Wood Thrush (Hylocichla mustelina) incubating


Animal ecology conservation

Hatching Wood Thrush nest next to regeneration opening


Animal ecology conservation

Breeding Bird Surveyhttp://www.mbr-pwrc.usgs.gov/bbs


Animal ecology conservation

Neotropical migrants are dependent on:

  • Breeding habitat

  • Migratory stopover sites

  • Winter habitat

  • Therefore, long-distant migrants link the ecosystems of the hemisphere, and

  • They are vulnerable to threats in each of these habitats.


Animal ecology conservation

Threats on breeding grounds:

  • Habitat destruction.

  • Habitat degradation.

  • Habitat fragmentation.

  • Brood parasitism by Brown-headed Cowbirds (Molothrus ater).

  • Nest predation by various nest predators.

  • Agricultural pesticides reduce food availability and poison birds.


Animal ecology conservation

Human land-use patterns affect the abundance, distribution, & activity of cowbirds & nest predators

  • Cowbirds feed in pastures, agricultural fields and lawns.

  • Cowbirds and many nest predators

    (e.g. Blue Jays, rat snakes, and raccoons) use forest edges.


Animal ecology conservation

Brown-headed Cowbirds (Molothrus ater)

  • Do not build their own nests.

  • Lay their eggs in the nests of other birds.

  • Often remove a host egg from the nest.

  • The host parents raise the cowbird young.

  • Cowbird nestlings out-compete host young and sometimes push them from the nest.


Animal ecology conservation

Brown-headed Cowbirds (Molothrus ater)


Animal ecology conservation

Nests parasitized by cowbirds


Animal ecology conservation

Nest predators in Midwestern forests include:

  • Blue Jays and crows.

  • Snakes, such as the black rat snake.

  • Large mammals, such as racoons and skunks.

  • Small mammals, such as squirrels and mice.

  • Many other birds and mammals may harm eggs and nestlings if given a chance.


Animal ecology conservation

Rat snake (Elaphe obsoleta) preying on Wood Thrush (Hylocichla mustelina) nest.


Animal ecology conservation

Edge Effects on Cowbird Parasitism


Animal ecology conservation

An “edge” is the border or transition between two habitat types.

  • Agricultural edges

  • Urban or suburban edges

  • Roads

  • Internal edges from clearcuts or maintained wildlife openings


Animal ecology conservation

Timber is extracted from Indiana state forests using individual and group selection techniques

  • Individual selection—Individual trees are removed from within a harvest tract.

  • Group selection—Small openings are created by removing groups of trees.

  • Site preparation entails the construction and maintenance of roads, skid trails, and log landings.

  • These methods generate high edge density.


Animal ecology conservation

Regeneration opening, Compartment 1, Tract 16


Animal ecology conservation

Acadian Flycatcher(Empidonax virescens)

  • Breeds in eastern United States.

  • Winters in Central and South America.

  • Nests in mature forest, May-August.

  • Nest suspended from fork in branch, typically 3-7 m high.

  • Clutch size usually 3.

  • Female incubates.

  • Both parents feed young.


Animal ecology conservation

Checking the contents of a Red-eyed Vireo nest.


Animal ecology conservation

Objective—Experimentally evaluate the effects of logging in Yellowwood State Forest on nest survival and cowbird parasitism level.

Hypothesis—Timber extraction decreases nest survival (by increasing predation) and increases parasitism.

Prediction—Nest survival will be lower and parasitism higher after logging than before, relative to values measured in unlogged sites.


Animal ecology conservation

Study Sites

  • Nests in eight tracts in Yellowwood State Forest were monitored in 1995 & 1996. (Three were also monitored in 1994.)

  • Four sites were logged between 1995 & 1996.

  • The other four sites were close to rotation age but remained unlogged during 1996.


Animal ecology conservation

Overall Success Rate of

Acadian Flycatcher nests in Yellowwood State Forest

before (1995) and after (1996) treatment sites were logged.

Treatment:Control 1.22

Treatment:Control 0.563

Ratio of 1996 OSRratio to 1995 OSR ratio: 0.460, p < 0.025(one-tailed)


Animal ecology conservation

Proportion of Acadian Flycatcher nests parasitized before (1995) and after (1996) treatment sites were logged.

Interaction effect: G = 3.49, df = 1, p = 0.031, (one-tailed)


Animal ecology conservation

Possible interpretations

  • If factors responsible for between-year variation operate similarly in both sets of sites, the observed interactions between year and treatment may indicate logging decreases breeding success.

  • Alternatively, site-specific processes at control tracts may have caused higher success in 1996.


Animal ecology conservation

Lessons from Indiana

  • Where avian conservation is a priority in eastern deciduous forests, timber extraction should be limited until effects on nesting success are understood.

  • Special attention should be given to monitoring breeding success of bird species that preferentially select edge habitats.


Animal ecology conservation

Solutions to conservation challenges

  • Population level

  • Species level—in situ and ex situ

  • Ecosystem level—protection & restoration

  • Landscape level

  • Regional level

  • Global level

  • Conserving evolutionary processes


Animal ecology conservation

Sustainability

Sustainable practices are practices that can continue indefinitely—without depleting or degrading resources needed to continue.

Agriculture

Industry

Economy

Human relations


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