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Man that was a lot of work… What does it mean???. It’s all About Relationships … and I don’t mean the touchy-feely kind. X axis is Independent Variable Cause Y axis is Dependent Variable Effect. Here are the Averages. Range of Activity. Increased CORT means a more ACTIVE bird

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it s all about relationships and i don t mean the touchy feely kind
It’s all About Relationships… and I don’t mean the touchy-feely kind
  • X axis is Independent Variable
    • Cause
  • Y axis is Dependent Variable
    • Effect
range of activity
Range of Activity
  • Increased CORT means a more ACTIVE bird
  • Activities:
    • Increased foraging behavior
    • Decreased parental behavior
    • Decreased aggression
why the differences
Why the differences???

Medium CORT

Arctic

Tioga Pass, CA

Highest CORT

Equator

Lowest CORT

slide12

Tropics

    • Pathogen pressure
    • increases at the equator
    • CORT can be immunosuppressive
    • Tropical birds must maintain low CORT
      • Means respond weakly to stress
slide13

Arctic

    • Weather conditions limit breeding opportunities
    • Increased CORT decreases parental care
    • Must have lower levels of CORT then Tioga
      • Arctic - one brood
      • Tioga – one to two broods
slide14

Tioga

    • Increased CORT increases activity and foraging behavior
    • Need to be able to reacted to changing weather conditions
      • from mild to sever storms
    • Can try for a second brood later
slide18

Males

80

Females

60

40

20

11

9

8

13

8

5

0

PESA

SESA

WESA

REPH

F

Parental care? :

M

M + F

Corticosterone Increase, ng/ml

Magnitude of

Pectoral

Semipalmated

Red

Sandpiper

Sandpiper

Phalarope

reference page
Reference Page
  • Breuner, C. W., Greenberg, A. L., and Wingfield, J. C. (1998). Non-Invasive Corticosterone Treatment Rapidly Increases Activity in Gambel\'s White-Crowned Sparrow (Zonotrichialeucophrysgambelii). General and Comparative Endocrinology 111: 386-394
  • Breuner, C., & Hahn, T. 2003. Integrating stress physiology, environmental change, and behavior in free-living sparrows. Hormones & Behavior, 43: 115-123.
  • Malisch, J., & Breuner, C. 2010. Steriod-binding proteins and free steroids. Molecular and Cellular Endocrinology 316: 42-52.
  • Martin II, L., Gilliam, J., Hahn, P., Lee, K., Wikelski, M. 2005. Corticosterone suppresses cutaneous immune function in temperate but not tropical House Sparrows, Passer domesticus. General and Comparative Endocrinology 140(2): 126-135.
slide20

Storm

Foraging Success/Body Condition

Poor

Good

Increase CORT

Remain

Can’t Find Food

Intensify Search

for Food

Find Food

Leave

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