-
Botulism (avian)
- Remains viable for long time in environment
- caused by toxin, limber neck in birds (drowns waterfowl)
- outbreaks occur in certain conditions (declining water levels, high pH, warm water, reduced O2)
- Maggots eat dead waterfowl, birds eat infected maggots/flies
- Controls: fluctuating water levels, diminish fly population, remove animal carcasses
-
Tularemia (mammalian)
- common in
- rodents and rabbits, bacterial (Francesella
- tularensis). Look for lesions on
- liver, inflammation of organs.
- Transmitted by fleas and ticks.
- Humans can contract, can be life threatening if left unthreatened.
-
Brucellosis (mammalian)
- found in
- elk, bison, caribou, and reindeer.
- Bacterial disease (Brucella
- ssp.). Transmission by accidental
- ingestion of bacteria that are shed by aborting animals. Concern over transmission from wildlife to cattle.
-
Scarcoptic mange (mammalian)
found primarily in red foxes and coyotes; parasitic arthropod disease caused by mite Scarcoptes scabiei. Erratic behavior in advanced stages. Loss of hair and thick, crusty skin. Tend to have outbreaks in 20 year cycles.
-
Rabies (mammalian)
all mammals susceptible to rabies. High risk species include raccoons, foxes, skunks, and bats. Viral disease caused by rhabdovirus. Dumb rabies vs. furious rabies.
-
Aspergillois
- fungus
- can kill turkeys and other seed eating birds
-
Sacrosporidiosis
- Rice breast
- common in waterfowl
- protozoan parasites
- highly visible cysts on breasts
- does not affect birds or humans
-
Lead poisoning
- common in waterfowl and raptors
- ingestion of lead shot and sinkers
- experience starvation prior to death (hatchet breast)
- Toxoicosis: gizzard will get compacted, green cloaca
-
Avian Cholera
- bacterial, highly infection
- non-native (from Asia)
- Source from poultry farm carcasses
- will kill populations rapidly
- birds look healthy until necropsy, when lesion on liver and heart.
- Controls: early detection, removal of carcasses, habitat management (flood area to dilute cholera)
-
-
-
Brain worm
- Parasitic nematode
- mammalian (avian eye worm)
-
Sylvatic plague
- Bacterial disease
- mammalian
-
Pros and Cons of Point Counts
Advantages: thoroughly sample patchy habitats. Known distances can be flagged. Easier to represent all habitat types.
Disadvantages: may disrupt target species, less efficient, may miss rare species.
-
Pros and Cons of Line Transects
Advantages: better spatial and temporal coverage, more efficient
Disadvantages: "requires" perpendicular distance, may under-sample certain habitat types, and many biases associated with road transects.
-
Distance Sampling Assumptions
- 1) Probability of detecting animal on transect is 1
- 2) Distances measured without error
- 3) Populations are closed during surveys
- 4) No responsive mvt prior to detection
-
Distance sampling data must include:
- -distance and # of birds
- -priori covariates (influence detection/density)
- -UTM's for density surface modeling
-
Program Distance
- -easy user interface
- -robust, empiracal, unbiased parameter estimates
- -goodness of fit
- -free
-
Two important sources of variation for site occupancy
- 1) Space: point of occupancy modeling is to provide inferences for areas that are too large to sample.
- 2) Detectability: few animals 100% detected
-
Purpose of Occupancy Modeling
- - distribution studies
- - meta-population studies
- - monitoring and management performance
-
Assumptions and biases of occupancy modeling
- -sites are assumed to be closed
- -species are correctly identified
- -probability of detecting a species at one site is independent of other sites
-
Definition of telemetry
a technology that allows for remote measurement and reporting of information
-
VHF
- -most commonly used
- -wide ranges of sizes
- -considerations: weights, battery size/type, power, antenna type, frequency.
-
GPS Transmitter
- -combo of GPS and satellite
- -highest accuracy but very expensive
- -heavier
- -can be solar powered
- -allows for more data collection
-
Satellite transmitters
- -moderate accuracy, expensive
- -lighter than GPS combo
- -use PTT
- -processing centers deliver results to users
- -Argo satellites
-
Geolocators
- relatively inexpensive, but
- inaccurate. Uses sunrise and
- sunset. Requires recapture.
-
Transmitter attachment for fish
body implants, esophageal implants, external mounted, external saddle-mount.
-
Transmitter attachment for terrestrial mammal
body implant, collars, tail tag.
-
Transmitter attachment for birds
- backpack, glue-on, belly band, leg band, necklace, prong-suture, subcutaneous implants,
- tail-mount, tarsal-jess, patagial, body implant.
-
Reptile transmitter attachment
body implant, glue-on, subcutaneous implant
-
Marine Mammal
templetag (more for ID, tag with electronic code), head-mount, back mount.
-
Transmitter options
- -mortality switch
- -temperature sensor
- -wet/dry (used on aquatic mammals to determine when in/out of water)
- -depth sensor
- -pressure sensor
- -activity sensor
-
Yagi
- antenna type
- most common, easy to use
- very directional
- back signal can occur if signals bounce around terrain
-
H-type
- not as powerful
- directionality can be a problem with them
- good in dense vegetation, small
-
Dipole
- Antenna type; omni-directional
- good for large study areas
- need additional antenna for homing
-
Loop Antennae
- antenna type used for lower frequencies
- lower frequencies travel further
-
Scanning receiver
- cheapest
- few channels (like 50)
-
Standard receiver-data logger
- Up to 4,000 channels
- Data logger function can be used at a stationary site where it logs locations at regular intervals
-
Coded reciever-data logger
allows for 25-100 unique individual codes per channel/frequency
-
Scientific receiver
- no data logger
- no coding
- cost effective
-
Remote data platform
- Stationary, records data at regular intervals
- generates survival or presence/absence data
- can get info by email on modern ones
- satellite
-
Key assumptions of telemetry studies
biologists assume that data from the set of observed individuals are representative of patterns of the overall target populations
-
Telemetry study considertions
- age, gender, time of day, season
- spatial scale of sampling
- When do you want your locations and how often?
-
Planning telemetry studies
- set clear study objectives
- have a priori questions
- plan a pilot
- animal selection (maximize inferential bounds)
- biological considerations
- get data from different times of day
- may have to have aerial flights to locate dispersed birds
-
Home range estimate data requirements
30-50 locations
-
6 types of telemetry data collection
- Non-direction- presence absence
- direct tracking
- triangulation
- global positioning system units
- platform terminal transmitters
- global location sensing units
-
Non-directional telemetry data
- typically done with automated receivers
- not precise
- detection distance is error rate
- presence/absence or survival; not for detailed habitat use or behavior
-
Direct tracking
- homing; directly approach the signal
- not good for animals that flee or change behavior when approached
- required for tag retrieval
- should be no error if animal or tag is seen
- useful for knowing exact location of animal
-
Triangulation telemetry data
- can be done with 2 locations, more preferable and more accurate
- take a bearing with compass, use landmark to pinpoint azimuth.
- program LOCATE
-
Declination
the difference between magnetic north and true north
-
Global positioning system
- determine location based on time
- must retrieve system or get near enough (at least 5-10 km) to remotely download (now can be done to cells)
- 20-200 m accuracy
-
Platform terminal transmitters
- uses satellites and the Doppler principle to create ellipsoid of potential locations
- difficulty detecting signals in areas with high electromagnetic interference
- ARGOS commercially operates the satellites and provides quality rankings for data points
-
Global location sensing units
- geolocators
- longitude estimated by local noon or midnight
- error averages 200-400 km
-
Sources of bias for radio telemetry
- radio-marked animals may impact animal behavior
- terrain, vegetation, and weather can increase error
- observer effects
- seek to minimize bias through detailed planning
-
Telemetry data data analysis
- must consider autocorrelation
- survival analysis
- resource use and selection
- home range estimates: minimum convex polygon vs kernel estimates
-
UTM
- metric based version of
- latitude/longitude. Northings (lat) and
- Eastings (long).
-
Proximate Analysis
separates food into 6 chemical constituents (water, ether extract/crude fat, crude fiber/digestible carbohydrate, crude protein, and ash/minerals).
-
Bomb calorimeter
- estimates gross energy of
- food (through complete oxidation)
-
Kjeldahl technique
a food is digested with a strong acid to release nitrogen. Amount of protein is calculated from the nitrogen concentrations of the food.
-
Soxhlet Apparatus
- ether extraction of dried,
- homogenized carcasses to determine fat composition.
-
Detergent analysis
break down of fiber
-
Blood urea nitrogen
- used as an index for protein
- nutrition of mammals (however, starved animals can have higher blood urea
- because they’re breaking down their own muscle).
-
TOBEC
- Total body electrical conductivity
- can use electrical conductivity to determine percent water (inversely correlated with fat)
- could overestimate due to inability to remove fat from GI tract
-
Corpus luteum
- counting these in the ovary gives an
- idea of ovulation rate
- involves collecting a cross section of ovary and
- examining it.
-
Corpus rubra
pink marking on ovary to estimate how many young the doe has produced
-
Placental scars
placental scares are pigmented areas of uterine tissue marking sites of previous placental attachment
-
Aggregate percent
average percent of food item for each species.
-
Percent occurrence
based on the number of individuals that fed on the food divided by the total number of individuals collected; frequency occurrence of food item among the population
-
Characteristics for good nutritional condition index
- -Should be sensitive to slight changes in nutritional status
- -should be specific in its indications
- -should involve collection of tissues or measurements easily obtained from live or dead by relatively unskilled personnel
- should
- -should measure condition of different age groups and sexes at different times of the year and not be affected by the stress of collection
- -should be objective and reproductible
-
Mammalian nutritional condition indices
- -whole body fat (soxhlet method)
- -skeletal measurements and weights (e.g. femur: hind foot ratio)
- -Kidney fat index (highest in late summer, low in march for deer)
- -marrow fat (white means depleted)
- -blood parameters (corticosterone, blood urea)
-
Mammalian order of fat depletion
- Subcutaneous fat (rump and saddle)
- abdominal
- bone marrow fat
-
Avian nutritional condition indices
- Body weight (40-60% of overall condition); compare with wing chord
- Discrete fat deposits
- Percent water (TOBEC)
- Protein Index: primarily used for waterfowl to determine fate of protein during reproduction. Grind up bird. Do study early spring.
- Bone marrow fat (uncommon)
-
Avian order of fat depletion
- Abdominal
- Subcutaneous
- Muscle/proteins
|
|