Upload
barrie-robert-bradley
View
218
Download
0
Tags:
Embed Size (px)
Citation preview
Key Definitions
• Productivity = number of offspring (young) produced during a reproductive cycle (season) by a population
• Recruitment = number of young produced in a popn that reach sexual maturity
• Fecundity = rate at which an individual produces offspring (young)
Key Definitions…MAMMALS
• _______________= follicles that erupted, sustained pregnancy, and “remain” in ovary post-partum
• _______________= “sites” on uterine horns were embryos attached
• ________ = near-term development
• ________ = post-partum viable young
Corpora luteum
• Requires sectioning (scapel or razor blade and examination.
• Number per ovary “________” number of fetuses that made it to full term—but not ______ accurate.
Placental scars• Can identify sites where
endometrium/fetus interfaced for exchange of nutrients and waste
• Considered _______ accurate than corpora luteua counts for species with litter sizes >2
• Fetuses not reaching but almostfull-term may leave “equally” pigment scars
• “____” until next breeding cycle at minimum
Fetuses
• Count near-term fetuses
• If not x-ray or ultrasound scan, then must sacrafice adult female
• Not as _____ as newborn count
• Variation in development of young can be observed
Litter – Count Youngpost-partum
• Closer to ___________________ would provide ‘best’ measure of productivity presented so far
• Key considerations (short list): Time of year Time of day
Experience of observers
Weather
Topography/Landscape
Think Spotlight Surveys for White-tailed Deer
1
2
3
4
5
• Key considerations (short list):
Time of night (including start/stop times)
Ground and Aerial Surveys
2
• Key considerations (short list):
Topography/Landscape(not vegetation --see 6)
Ground and Aerial Surveys
5
• Key considerations (short list): Other:EquipmentHunting “Pressure”Vegetation
Ground and Aerial Surveys
6
Quivira National Wildlife RefugeKansas 1989-2005
Pre-Rifle Season
Wh
ite-
taile
d D
eer
____________________