Lecture_8_wo_answers

Lecture_8_wo_answers - October21,2010 Dr.SallyHolbrook...

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EEMB 120 – Introduction to Ecology October 21, 2010
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3316 Marine Sciences Building Thursdays 2-3 or by appt. [email protected] Dr. Sally Holbrook Population and Community Ecology of Marine  Organisms, especially Reef Fish
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Scientific study of the interactions that determine the distribution and abundance of organisms What is Ecology? 1. relationships between organisms – biotic interactions 2. relationships between organisms and the physical environment – abiotic interactions Spatial location of individuals across the landscape Commonness and rarity H
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Interactions Between Species Why study biotic interactions? Types of interactions Interspecific competition Limiting resources Mechanisms of competition Lotka-Volterra Theory Equations for the model Graphical solutions Assumptions Using the model framework in a real ecological system
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Biotic Interactions Interactions between individual organisms   May be between individuals of  same  species  intra ”specific interaction Example: Intra specific Competition in big  horn sheep
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Biotic Interactions Interactions between individual organisms   May be between individuals of  different  species  inter ”specific interaction Example: Predation is an  inter specific interaction  between predator (mountain lion) and  prey (big horn sheep)
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Why Study Biotic Interactions ? Will a species go extinct following invasion of a predator or  competitor ? Competition between mud snails Native snail: Cerithidea californica Batillaria attramentaria introduced into northern  California bays in early 1900’s Species very similar in resource use, but:  Batillaria makes more efficient use of    resources   Batillaria   has a lower mortality rate. Batillaria Cerithidea Byers 2001 Modeling predicted Batillaria  would exclude Cerithidea in 55 to 70 years !! Exclusion near in Bolinas and in Elkhorn Slough (Text p. 305-306)
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Why Study Biotic Interactions ? What mechanisms or species traits promote  coexistence ? Biological Control of Pests Goal is to introduce predator which will  control pest population without driving it  extinct Red scale is a common pest  affecting citrus industry Introduced small wasp, Aphytis, which  preys on scale Murdoch et al. 2005
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Understanding Community Structure and Function Biological communities consist of  multiple species involved in a web of  pair-wise biotic interactions Which are the most important interactions  in promoting overall diversity ? Keystone species – 
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This note was uploaded on 11/11/2010 for the course EEMB 120 taught by Professor Nisbet during the Fall '08 term at UCSB.

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Lecture_8_wo_answers - October21,2010 Dr.SallyHolbrook...

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