Lecture_1_-_Sponges_2008_-_4_slides

Lecture_1_-_Sponges_2008_-_4_slides - 1 EEMB 3 Introduction...

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Unformatted text preview: 1 EEMB 3: Introduction to the Animals: Sponges Lecture 1 May 16, 2008 Professor Hofmann Announcements • Office hours: Marine Science Building, Room 2411 – Mon 11am-12:30pm – Wed 11am -12pm – Or by appointment • [email protected] • Office: 893-6175 • Outline of lecture will be posted asap, usually the afternoon before class • Honors meeting: Friday, May 16th and May 30th – in MSB Auditorium on May 30th @ 11am - 12pm • Readings in Life – Lecture 1: Sponges (CH. 31, pp. 670-684 – Lecture 2: Cnidarians (pp. 685-689, for Monday, May 19) Goal of Lecture 1 • What is an animal? • What are the common ancestors? • What traits do all animals share? • Our first group: Sponges What characters distinguish animals from other organisms? • Multicellular organisms – but incredibly diverse. 2 Nutritional considerations: Heterotrophs • Animals must consume organic compounds. • Lack ability to make them from inorganic molecules. • Digest internally, somehow (this is also highly variable in the animal kingdom) Feeding strategies • Filter feeders • Herbivores • Predators • Parasites • Detritivores Some sort of motion is required to get the food… • Motion is relative – Locomote to get food – Move environment – “Sit and wait” • Energy is expended Locomotion & the need to find food has resulted in unique systems • Sensory systems are unique as compared to plants, for example. – Variety of sensory structures – Nervous systems to process and coordinate the sensory information and “organize” a response. • Behavior – in this regard, animals are much more complex than plants 3 With all this variety, how do biologists describe the evolutionary relationships among the animals? First, let’s look at what ALL animals share: Animals are descended from a single ancestral line “Monophyletic” Animal Evolutionary Relationships • Phylogenies are “estimates” of relatedness • Can be made with morphological data or with molecular data • Many different approaches combined • Simplest animals: Sponges, cnidarians,...
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This note was uploaded on 07/15/2008 for the course EEMB 3 taught by Professor Carlson during the Spring '08 term at UCSB.

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Lecture_1_-_Sponges_2008_-_4_slides - 1 EEMB 3 Introduction...

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