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Published byWilfred Green Modified over 9 years ago
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Biodiversity
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Why is Biodiversity Important? Genetic diversity:
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Why is Biodiversity Important? Species Diversity:
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Why is Biodiversity Important? Ecosystem Diversity:
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Diversity = Richness + Evenness richness: count of # species evenness: relative abundance of species Ecosystem AEcosystem B 4 oak species3 oak species bl oak = 40 bl oak = 120 wh oak = 30wh oak = 60r oak = 20 pin oak = 10pin oak = 0
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A = B = alpha ( ) diversity – within habitat C = beta ( ) diversity – among habitat D = gamma ( ) diversity – geographic scale Three Scales of Diversity
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Alpha & Gamma Species Diversity Indices Shannon-Wiener Index – most used -sensitive to change in status of rare species H’ = diversity of species (range 0-1+) s = # of species p i = proportion of total sample belonging to ith species
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Alpha & Gamma Species Diversity Indices Shannon-Wiener Index
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Alpha & Gamma Species Diversity Indices Simpson Index – sensitive to changes in most abundant species D = diversity of species (range 0-1) s = # of species p i = proportion of total sample belonging to ith species
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Alpha & Gamma Species Diversity Indices Simpson Index
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Alpha & Gamma Species Diversity Indices Species Evenness H’ max = maximum value of H’ = ln(s)
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Beta Species Diversity Indices Sorensen’s Coefficient of Community Similarity – weights species in common S s = coefficient of similarity (range 0-1) a = # species common to both samples b = # species in sample 1 c = # species in sample 2
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Beta Species Diversity Indices Sorensen’s Coefficient of Community Similarity Dissimilarity = D S = b + c / 2a + b + c Or 1.0 - S s
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SpeciesSample 1Sample 2 111 210 311 400 511 600 700 810 911 1000 1111 1200
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Sorensen’s Coefficient Sample 1 –Total occurrences = b = 7 -# joint occurrences = a = 5 Sample 2 –Total occurrences = c = 5 -# joint occurrences = a = 5 S s = 2 * 5 / 10 + 7 + 5 = 0.45 (45%) D s = 1 – 0.45 = 0.55 (55%)
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Species-of-the-Week American woodcock (Scolopax minor)
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Habitat Woods & thickets with moist soil, small openings near woody cover aspen, alder, willow cover types (early successional = seedling/sapling stage; <3 in dbh)
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Food Diet = 50-90% earthworms Diurnal foraging in spring/summer Nocturnal foraging in winter Long bill used as probe (foot stomping)
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Reproduction Courtship behavior = males on breeding fields Mar- Apr -- polygynous Clutch size = ~4 eggs I.P. = 21 days; near full grown in 28 days Behavior -Migratory – winters in SE U.S. -Nonvocal calls = wing position
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Estimating Abundance of Wildlife Terms -Population -Relative vs. Absolute Abundance -Parameter vs. Statistic -Population Index -Accuracy -Precision -Bias
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Estimating Abundance of Wildlife Complete Counts (Census) -open habitat = visible wildlife -concentration of activity -small study area
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Estimating Abundance of Wildlife Complete Counts (Census) -Drives * Biased (under- or overestimate) -Territorial (Spot) Mapping e.g., breeding birds
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Territorial (Spot) Mapping Limitations: - territorial species (grouse, songbirds) - sex ratio known or assumed -nonterritorial males? (floaters) -ability to id species & map territories
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Estimating Abundance of Wildlife Complete Counts (Census) -Aerial Counts & Sensing - must see animal to count it! - Aerial Photos or IR Thermal Scans -photos of migratory waterfowl
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Estimating Abundance of Wildlife Complete Counts (Census) -Aerial Counts & Sensing Aerial line-transect counts -must see animal to count it! Aerial Photos or IR Thermal Scans -photos of migratory waterfowl -IR scans of wildlife (bowhunting study in MN – loss rate)
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Estimating Abundance of Wildlife Complete Counts - Sample Plots -Line transects (ground or aerial) -e.g., flush count for grassland birds -assumes 100% detection
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Indices of Relative Abundance …dependent on the collection of samples that represent some relatively constant but unknown population size –Traps, number of fecal pellets, vocalization frequency, pelt records, catch/unit effort, number of artifacts, questionnaires, cover, feeding capacity, roadside counts
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Indices of Relative Abundance
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Capture Techniques
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Radio Telemetry
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Female Male Spatial Organization
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Scent Stations
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Remote Camera Systems
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DNA Fingerprinting
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GPS
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