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larval period

The influence of larval growth history and exogenous thyroid hormone on life history allocation patterns in the axolotl ( Ambystoma mexicanum ) Pamela M. Clarkson and Christopher K. Beachy Minot State University. metamorphic size. larval period. Wilbur and Collins, 1973.

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larval period

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  1. The influence of larval growth history and exogenous thyroid hormone on life history allocation patterns in the axolotl (Ambystoma mexicanum)Pamela M. Clarkson and Christopher K. BeachyMinot State University

  2. metamorphic size larval period Wilbur and Collins, 1973 This pattern is uncommonly observed in nature. Lab manipulations of growth almost never confirm this.

  3. larval growth energy intake metamorphic development sexual maturation storage metamorphic size metamorphic size larval period larval period

  4. energy intake metamorphic size metamorphic size larval period larval period larval growth sexual maturation storage

  5. larval growth energy intake sexual maturation storage larval growth energy intake metamorphic development sexual maturation storage Ambystoma mexicanum Ambystoma mexicanum + 5 nM TH

  6. TIMELINE in days switch food treatments initiate food treatments initiate TH treatments last metamorph first metamorph 21 January 2008 hatching first weighing third weighing Metamorphic (and control) weights 14 March 2007 second weighing fourth weighing Two-factor MANOVA metamorphic timing (TH) gonad mass fat body mass metamorphic mass

  7. control 5 nM TH 5 nM TH

  8. Big Gonads Big fat bodies

  9. Metamorphs (TH treated animals) switched to low food metamorphic mass (g) switched to high food

  10. switched to high food fat body mass (mg)

  11. PAEDOMORPHS METAMORPHS fat body mass (mg) fat body mass (mg)

  12. Our Results • In the low-high group, metamorphosis was delayed similar to the Wilbur-Collins hypothesis

  13. Final Analysis • Suggests storage and metamorphic development interact  classic Wilbur-Collins model • Storage rather than growth may be an indicator of environmental quality or deterioration

  14. ACKNOWLEDGMENTS Heather Modrow (MSU) Leah Crites (MSU) Charles Crites (MSU) Sharon Denks (FBCC) Dwight Blackhawk (FBCC) Karen Pocha-Melby (MSU)

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