Man that was a lot of work what does it mean
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Man that was a lot of work… What does it mean??? PowerPoint PPT Presentation


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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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Man that was a lot of work… What does it mean???

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Man that was a lot of work what does it mean

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

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

Here are the Averages...


Range of activity

Range of Activity

  • Increased CORT means a more ACTIVE bird

  • Activities:

    • Increased foraging behavior

    • Decreased parental behavior

    • Decreased aggression


Cort across latitudes

CORT Across Latitudes


Why the differences

Why the differences???

Medium CORT

Arctic

Tioga Pass, CA

Highest CORT

Equator

Lowest CORT


Man that was a lot of work what does it mean

  • Tropics

    • Pathogen pressure

    • increases at the equator

    • CORT can be immunosuppressive

    • Tropical birds must maintain low CORT

      • Means respond weakly to stress


Man that was a lot of work what does it mean

  • 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


Man that was a lot of work what does it mean

  • 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


Mommy or daddy who has more cort

Mommy or Daddy… who has more CORT


Man that was a lot of work what does it mean

Female cares for young…


Man that was a lot of work what does it mean

What if it is the MALE who cares for the young?


Man that was a lot of work what does it mean

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.


Man that was a lot of work what does it mean

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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