Society for Conservation Biology Auburn University Chapter Check us out on Facebook WHEN?TUESDAY Mar. 3 6:00-7:00 PM Guest Speaker: Dr. David Steen “Road.

Presentation on theme: "Society for Conservation Biology Auburn University Chapter Check us out on Facebook WHEN?TUESDAY Mar. 3 6:00-7:00 PM Guest Speaker: Dr. David Steen “Road."— Presentation transcript:

1 Society for Conservation Biology Auburn University Chapter Check us out on Facebook WHEN?TUESDAY Mar. 3 6:00-7:00 PM Guest Speaker: Dr. David Steen “Road mortality and freshwater turtle conservation in North America” Also: Info on Tigers 4 Tigers plans for spring semester! WHERE? 112 Rouse Life Sciences

2 Ch. 7: Plant Growth and Reproduction

3 Plant Growth Includes: –phenology –location of overwintering buds (criterion for major subdivisions) Fig. 7.2

4 Plant Growth Main Raunkiaer categories (7): –7) Epiphyte: germinates & grows on plants Lab #3: Who am I??

5 Epiphyte Focus Effect on host: –Negligible (commensalism: one benefits & other unaffected) –(+,0) (epiphyte, host)

6 Epiphyte Focus Effect on host: –Positive. Canopy roots (host): roots –Mutualism: (+,+) Trees known to form canopy roots

7 Parasitic Epiphytes Negative: Parasites. Tap Parasitism. (+,-) (epiphyte, host)

8 Parasitic Epiphytes Holoparasites: No chlorophyll. Haustoria (modified roots) penetrate Ex, dodder (Cuscuta) “Witches hair” “Love vine”

9 Parasitic Epiphytes Hemiparasites: Chlorophyll-- water & nutrients from Ex, Who am I? (Lab #3)

10 Plant Reproduction 2 main types Two main types…..

11 Plant Reproduction Sexual reproduction: genetically varying offspring (via meiosis & fertilization)

12 Plant Reproduction Asexual reproduction: genetically identical offspring (involves mitosis) –Ex, clonal growth (discussed)

13 Plant Reproduction Agamospermy: seeds asexual (CLONES) –Exs: Taraxacum (dandelion), some Rubus

14 Plant Reproduction Asexual reproduction: genetically identical offspring Sexual reproduction: genetically varying offspring (via meiosis and fertilization )

15 Plant Reproduction Meiosis: reduction division 2N to 1N

16 Plant Reproduction Fertilization: gametes (egg+sperm) form 1N to 2N Human example….

17 Plant Life Cycle Life cycle: Involves 1) meiosis, 2) fertilization, 3) haploid cells, 4) diploid cells

18 Plant Life Cycle Sporic meiosis: 2 bodies, 1 cycle: alternation of generations Sporophyte 2N, gametophyte 1N

19 Plant Life Cycle Gametophyte (1N): gametes BY MITOSIS Fertilization: zygote (2N) Start

20 Plant Life Cycle Zygote to sporophyte (2N): mitosis Sporophyte: spores BY MEIOSIS Spore to gametophyte: End

21 Plant Life Cycle Mosses: gametophyte leafy –Sporophyte on Granite outcrop lab

22 Plant Life Cycle Seed plants + ferns: major body = _______ Who am I? (Lab 3) Epiphyte fern Site for sori…. Lab #1? Where other “body”?

23 Plant Life Cycle Where gametophytes? –Seed plants: male = pollen grain Ferns

24 Plant Life Cycle Female gametophyte (embryo sac): inside ovule Ovules in ovary

25 Life Cycle Mature male gametophyte = Fertilization: sperm & egg form zygote (2N) DOUBLE fertilization!

26 Life Cycle Zygote: embryo in ovule Endosperm: nutritive Ovule into seed What’s a seed??

27 Life Cycle Seed: baby plant ( : new sporophyte) in box ( coat) with lunch ( : flowering plants)

28 Terms Flower parts (BIOL 1030) 4: sepals, petals, stamens, pistil(s) Carpel= Pistil here

29 Floral variation Fusing petals –Long-tongued/long-billed pollinators Who am I? (Lab #3) seeds

30 Floral variation Stamens & pistils: perfect flowers

31 Floral variation Some imperfect. Pistillate (pistil) or staminate (stamens) Staminate flowers of Sagittaria Pistillate flowers of Sagittaria

32 Floral variation Pistillate & carpellate.: dioecious (MUST outcross) Monoecious: both sexes Cones!

33 Floral variation Ex. dioecious species: Persimmon (Diospyros virginiana) Persimmon fruits Staminate flower Pistillate flower

34 Floral variation Complete flowers: all 4 parts (sepals, petals, stamens, pistil) Lack : incomplete flowers Diospyros?

35 Floral variation Group flowers: inflorescence –One type: head –Ex, sunflower (Asteraceae) –Ray flowers: lg. –Disk flowers sm. disk flowers ray flowers

36 Floral variation Who am I? (Lab #1) –Inflorescence: white structures = bracts Inflorescence Closeup showing individual greenish flowers

37 Pollination Why flowers vary? Many form mutualism w/ animals

38 Terms Pollination (flowering plants): transfer Carpel=pistil

39 Terms Fertilization: sperm fuses w/ egg (in ovule), makes

40 Pollination Abiotic: pollen carried

41 Wind Pollination Grasses, temperate trees (Quercus, Carya, Pinus) Not Carya A grass

42 Terms Biotic pollination: pollen carried by animal-- 90% flowering plants –Floral visitor: visits –Pollinator: deposits

43 Pollination as Mutualism Mutualism (+,+) interaction –Plant gets –Animal gets Reward?

44 Animal Rewards Pollen: hi Also lipids, Renewable…