Testosterone juvenile hormone? corticosterone Gibberellins (+) abscisic acid (-) Environment Behavior physiology.

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Presentation transcript:

testosterone juvenile hormone? corticosterone Gibberellins (+) abscisic acid (-) Environment Behavior physiology

time (min) CORT (ng/ml) STRESSOR hypothalamus pituitary adrenal GLUCOCORTICOIDS Target tissue

Corticosteroid Binding Globulin (CBG) STRESSOR hypothalamus pituitary adrenal GLUCOCORTICOIDS Target tissue CBG

Laysan Albatross

Kilauea Point NWR, Kauai Albatross Hill

Albatross development time-line ~November ~January~July~June Mom lays egg Egg Hatches Chick grows (body growth) incubation Fledge! wing growth

Albatross development time-line ~November ~January~July~June Mom lays egg Egg Hatches Chick grows (body growth) incubation Fledge! wing growth condition

~November ~January~July~June Mom lays egg Egg Hatches Chick grows (body growth) incubation Fledge! wing growth -Late in the season, food availability is unpredictable -Body condition declines →CORT may go up with declining body condition! →CORT is elevated in some species before fledge ? What is the relationship between morphology, stress physiology, and fledging? Albatross development time-line condition

Capture chicks (n = 14) every 4 days Morphological measurements (mass, wing length, tarsus, culmen) Blood samples Fledge Date

Growth measures Wing LengthTarsus Length Days before fledgiing

Linear Mixed Effects Model, p < Body Condition

CORT CBG

Free CORT

Correlation poor good Body Condition v. free CORT

Experimental Manipulation Captured chicks same as in first group (n = 8) Morphological measurements, blood samples Normal weight loss = g/4 days Fed chicks ~150g squid every 4 days

LME, p < Body Condition – unfed

* Fed birds still declined in body condition, but significantly less (LME, p < 0.05) Body Condition – unfed v. fed

CORTCBG Unfedv. Fed

t-test, p < Free CORT

Age at Fledging

Summary Approaching fledging, we see... ↓ Body Condition Accompanied by ↑CORT and ↓CBG – resulting in ↑↑ free CORT Body condition negatively correlated with free CORT Feeding... Reduction in the ↑CORT and ↓CBG, resulting in ↔ free CORT Delays fledging by average of 9 days

TimeFledge at longest wing length Body Condition Fledge Free CORT Fledge Threshold Fledge

Good Critical Body Condition Total CORT CBG capacity Nest abandonment Predictable Fasting in Albatross goodpoor Body Condition (mass/culmen*100) CBG (nM specific binding) CBG