Lecture 32 _March 28_ Angiosperms _ Insects post

Lecture 32 _March 28_ Angiosperms _ Insects post - Biology...

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1 Lecture 32: Monday March 28, 2011 Biology 171 Announcements Exam 3 Wednesday March 30, 6-8pm Revision Sessions – Sunday & in class on Wednesday Discussion Next Week: Ant-fungal coevolution Text Reading Chapter 30 (561-565) Chapter 40 (892-895; 788-790; 792-798) Evolution of Angiosperms (Flowers Pollination Insect Pollinator & Angiosperm Coevolution - some examples of this epic diversity Angiosperms: Who Cares? • Most of the world’s food crops are angiosperms (corn, wheat, rice, etc) • The angiosperms are the most diverse group of land plants and plant diversity promotes animal diversity • Insects are the most diverse clade of metazoa (animals) in part because of their interactions with plants • We rely on insects for a wide variety of ecosystem services
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2 Recap - Reproduction in Land Plants: Generalized Life Cycle Plants are unusual in that have both a diploid multicellular phase and a haploid multicellular phase in the life cycle. The diploid phase is called the sporophyte , the haploid phase the gametophyte . This type of life cycle is called alternation of generations . What is an Angiosperm? Angiosperms generally have the following traits They are multicellular photoautrophs with vascular systems, pollen, and seeds They reproduce by means of flowers, with characteristic male and female structures They often produce fruit Land Plant Phylogeny When Did Angiosperms Evolve? The first angiosperms appeared about 130 MYA, in the Cretaceous
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3 The Angiosperm Radiation Angiosperms represent one of the great adaptive radiations in the history of life. Angiosperms are the most diverse land plants living today. About 250,000 species have been described, and more are discovered each year. Their diversification is associated with the evolution of flowers and fruits, and both involve co-evolution with animals for enhanced reproductive success and dispersal. In both cases - the animals provide the plants with additional motility. Petals are arranged around the receptacle in a whorl. They are often brightly colored and advertise the Fower to visually oriented animals such as bees, wasps, and hummingbirds. The
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Lecture 32 _March 28_ Angiosperms _ Insects post - Biology...

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