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PLANT ADAPTATIONS

PLANT ADAPTATIONS. Steve Blake Aldo Leopold High School Tropical Ecology. RAINFOREST PLANT ADAPTATIONS. Strong scent of fruits attracts animals, which feed on the fruit and assist in dispersal of the seeds . Thick, waxy surface of leaves protects against hot sun, heavy rain,

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PLANT ADAPTATIONS

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  1. PLANT ADAPTATIONS Steve Blake Aldo Leopold High School Tropical Ecology

  2. RAINFOREST PLANT ADAPTATIONS

  3. Strong scent of fruits attracts animals, which feed on the fruit and assist in dispersal of the seeds Thick, waxy surface of leaves protects against hot sun, heavy rain, and strong winds Strong scent and bright colours of flowers attract insects which assist in pollination Aerial roots of epiphytes absorb moisture from the air Tall straight trunks no side branches Thin, smooth bark Shallow spreading root system Buttress roots

  4. 45 40 35 30 25 20 15 10 5 AEmergent tree canopy BLarge trees of Middle layer CLower tree layer DShrub/small tree layer EGround vegetation

  5. Epiphyte adaptations • Advantages of being an Epiphyte in the rainforest: • access to more direct sunlight • a greater number of canopy animal pollinators, • the possibility of dispersing their seeds via wind.

  6. Bromeliads • The pineapple family. • Thick, waxy leaves form a bowl shape in the center for catching rainwater. • Some bromeliads can hold several gallons of water and are miniature ecosystems in themselves providing homes for several creatures including • frogs and their tadpoles • Salamanders • Snails • Beetles • mosquito larvae. • Those that die decompose and furnish the plant with nutrients.

  7. One bromeliad was found to contain several small beetles, crane flies, earwigs, a frog, a cockroach, spiders, fly larvae, a millipede, a scorpion, woodlice and an earthworm!

  8. Tree adaptations • Height –50-85 m • Light competition • Biologically diverse (100-300 species/hectare) • Reduce disease transmission • Smooth bark • Reduce epiphytic growth

  9. Some rainforest trees have smooth, thin exfoliating bark • By frequently exfoliating patches of thin, papery bark, the tree can shed epiphytes • Here an liana is about to lose its grip on the tree trunk

  10. Tree adaptations (continued) • Leaf shape to shed water • discourage epiphytes, send water to roots • Leaf stalks rotate to follow sunlight

  11. Buttress Roots • Compensate for shallow roots • Because nutrients are shallow • Support • grow out from the base of the trunk up to 15 ft above the ground. Extended roots increase area over which nutrients can be absorbed.

  12. Prop or Stilt Roots • Stabilize trees in flood areas like mangrove trees

  13. Mangrove with prop roots

  14. Stilt roots of “Walking palm tree” move toward light by adding prop roots to light side and losing them on dark side.

  15. Matapalos (Strangler Fig) • Hemiepiphytes: • Start as epiphytes and grow very slowly to ground—then accelerate growth rapidly. Why? • Eventually kill and replace tree and becomes hollow inside—home to animals that deposit nutrients.

  16. David Attenborough video of Strangler Fig!!

  17. An adaptation rare in the Neotropics… • Carnivorous plants! • Trap and consume animals for their nutrients

  18. Pitcher plant - a carnivorous plant. slippery rim tendril Insects falling into the pitcher are digested, and nutrients which are released are absorbed by the plant.

  19. Droseracapillaris, (pink sundew) • At the end of each tentacle is a gland that secretes droplets of sticky fluid. • Insects attracted to odor become stuck. • Tentacles slowly enclose the victim and secretes digestive enzymes and acids that dissolve the body. • Utricularia, bladderworts • Utriculariafoliosa • Utriculariagibba

  20. Droseracapillaris (sundew)

  21. Utriculariagibba: trap showing trigger hairs • Utriculariafoliosa

  22. Lianas and vines • Thick, woody stems • up to 3,000 ft long • Begin life on forest floor but use trees for support to climb upwards towards sunlight • 90% of species in rain forests.

  23. Lianas (continued) • Attach to trees with sucker roots or tendrils and grow with the sapling, or climb by winding themselves around the trunk. • When they reach top of canopy they spread to other trees or wrap themselves around other lianas. • Gives support against winds to the shallow-rooted, top-heavy trees. However, when one tree falls several others may be pulled down.

  24. Seed Dispersal • Seed dispersal processes dominated by vertebrate dispersers • involve individuals belonging to hundreds of species

  25. Dispersal Types • Gravity (‘Gravichory’) • Wind (Anemochory) • Water (Hydrochory) • Ballistic (Autochory) • Animal (Zoochory) • Epizoochory (transported externally) • Inadvertent (cached) • Myrmechory (ant-dispersed) • Endozoochory (through the digestive tract) images: http://www.cas.vanderbilt.edu/bioimages/pages/fruit-seed-dispersal.htm

  26. Fruits • Nutritive fleshy pericarp or pulp; • Chemical attractant; • Colors • Fruit size varies from 0.01g to 40g • In Neotropical forests, 50 - 90 % of the canopy trees bear fruits adapted for animal dispersal, while close to 100 % of the shrubs and sub-canopy trees produce fleshy fruits

  27. Frugivores • High variety of tropical bird, bat, ant, mammal dispersers • Frugivore size ranges from ~10g tyrannid flycatchers to African Elephant • Enormous differences in fruit and frugivore scales imply an enormous potential range of phenomena http://sites.ac-mayotte.fr/ http://www.fsd2010.org/news/65.htm

  28. Outline

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