W09_L5_Fd3_Life+Histories-1

W09_L5_Fd3_Life+Histories-1 - Functional diversity 3: Life...

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1 Functional diversity 3: Life histories Which of these species are chordates? A. ET B. Chewbacca C. Alien D. Sea Squirts E. None of them F. More than 1 of them First a clarification Jan 12, 2009 Macquarie Island. Cat removal has resulted in a rabbit explosion, that is devastating penguin habitat Why does fertilization with limiting resources (N, CO2, Precip,) reduce diversity? Indirect effects outweigh direct effects. Although N and CO2 may increase growth rates of wildflowers, these nutrients assist the dominant grasses even more. Thus, the dominant grass populations expand and they displace the wildflower species. Morphological adaptations to water stress in plants: Decrease Loss Waxy covering to leaves Reduce stomatal opening Wilting (reduces surface area and heat from sun) Increase uptake -deep tap roots -store water during times of plenty (e.g., cactus) Mesquite Saguaro cactus NOTE: Lecture notes from last time that I did not get to, remain the lecture notes. You should familiarize yourself with these notes as they are testable material. Yes, I will account for the fact that I did not get a chance to cover them in lecture (meaning my level of expectation may be slightly lower). Life history tradeoffs . For example between quantity and quality in offspring production Life histories. How do we classify these differences? Classifying Life Histories • Developmental strategies •D i s p e r s a l strategies – Propagules • Reproductive strategies – Propagule production – Reproductive investment and lifespan
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2 Tadpole larva Settlement metamorphosis juveniles Adults Direct development : newborns emerge from mother or egg similar to adults Indirect development - involves a larval stage and metamorphosis . Larvae may develop with mother (brooded) or outside the mother (broadcast spawning) Life history of a sea squirt DEVELOPMENTAL STRATEGIES C. Notochord Taxonomic distribution of development • Direct development – Birds, mammals, reptiles, some reps in a variety of phyla • Indirect development – Amphibians (tadpoles to frogs) – Insects (nymphs to adults, but also some direct development) – Many marine phyla Point: There is not a strong, deep taxonomic linkage. So, is there a functional link?
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This note was uploaded on 10/08/2009 for the course BIS 2 taught by Professor Schwartzandkeen during the Spring '09 term at UC Davis.

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W09_L5_Fd3_Life+Histories-1 - Functional diversity 3: Life...

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