Life Cycles

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Title:

Life Cycles

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Sets sensitivity periods for circannual patterns. Sensitivity ... Waterfowl Cycles. Continuous Molt. Hornbills & Raptors. Polar Birds. Tropical Birds ... – PowerPoint PPT presentation

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Title: Life Cycles

1
Life Cycles
2
Bird Goals
BREED
MIGRATE
MOLT
MOLT
SURVIVE
MIGRATE
3
Energetics

Each takes energy
Caloric Constraints
Nutritional Constraints
Weather Constraints
Nest-site Constraints

4
Energetics

Each takes energy
Caloric Constraints
Nutritional Constraints
Weather Constraints
Nest-site Constraints

Caloric Availability
W Sp Su F W
5
Energetics

Each takes energy
Caloric Constraints
Nutritional Constraints
Weather Constraints
Nest-site Constraints

Caloric Availability
W Sp Su F W
6
Energetics

Each takes energy
Caloric Constraints
Nutritional Constraints
Weather Constraints
Nest-site Constraints

7
Energetics

Each takes energy
Caloric Constraints
Nutritional Constraints
Weather Constraints
Nest-site Constraints

8
Timing of Breeding
Food is rarely the signal
Pair Formation
Egg Hatching
Caloric Availability
Egg-Laying
Gonadal Growth
Fledgling Growth
W Sp Su F
W
9
Timing of Breeding
Food is rarely the signal
Caloric Availability
W Sp Su F
W
10
What Else Could Be?
11
Circannual Rhythms

Internal Clocks
Run 12 Months
Zeitgeber
Uncoupled in some tropical / seabirds
Fine Tuning by temp / weather / behavior

12
Circadian Rhythms

24 Hour Clocks
Reset by Zeitgebers
Shifts in metabolism
Sets sensitivity periods for circannual patterns

13
Sensitivity Photorefractory Periods
Daylight
DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
OCT NOV DEC
30o 38o 45o
Gonad Growth
Latitude
DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
OCT NOV DEC
none late early
Gonad Growth
Failure
Reproductive Hormones
Molt
Photorefractory Period
14
(No Transcript)
15
Cycles without Daylight