BISC 1005, Week 1
BISC 1005, Week 1 BISC 1005
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This 2 page Class Notes was uploaded by Jaimee Kidd on Saturday September 24, 2016. The Class Notes belongs to BISC 1005 at George Washington University taught by Scully, T in Fall 2016. Since its upload, it has received 4 views. For similar materials see The Biology of Nutrition and Health in Biology at George Washington University.
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Date Created: 09/24/16
Ecosystem Dynamics Part 2 Symbiosis • Often mistaken as always being beneficial interaction... ◦ Two or more organisms ◦ Live in, on or around one another ◦ Very close association at some point in their lifecycle Who Is My Friend? • Competition ◦ -‐/-‐ Interaction ◦ Where both species are harmed ◦ Niche ▪ Sum total abiotic and biotic needs of a species/population to survive and reproduce ◦ Both species cannot be as successful as they would in the other’s absence ▪ Relative to food production ▪ Competition between ▪ Cops/native species ▪ Animals bred for food/native species ▪ Why Do Farmers Use Antibiotics? ▪ Growth rate increases giving farmers the ability to sell meat faster ▪ Why Is This Potential Harmful? ▪ Potentially exposes other animals to dangerous proteins (i.e. mad cow disease) ▪ Antibiotic resistance • Exploitation ◦ +/-‐ interaction ◦ Where one species benefits, other is harmed ◦ Exploiters are generally consumers falling into three main categories: ▪ Herbivores: eat plants or plant parts ▪ Predators: kill other animals (prey) for food ▪ Parasites: live in or on the organisms they eat ▪ Parasitism ▪ Pathogens: ▪ Disease-‐causing • Commensalism ◦ +/0 ◦ Where one species benefits at no cost to the other • Mutualism ◦ +/+ interaction ◦ Where both species benefit ◦ Increasing the survival and reproduction of both of the interacting species ▪ Gut inhabitant ▪ Seed dispersal ▪ Pollinator ▪ Behavioral ▪ Protection • Micro biome ◦ All the organisms which live in symbiotic relationships with humans ▪ Changes constantly ▪ Every aspect of your life impacts the diversity ▪ What does it affect? ▪ Digestion/Absorption ▪ Immune system-‐ allergies, autoimmune diseases and general defense ▪ Development ▪ Stress/psychological issues ◦ Changing Roles ▪ Switch hitters ▪ Transitions between one type of species-‐species interaction to another ▪ Ex. Commensalism to exploitation