BSC 101 Helms Week 6 Lecture Notes 9/21-9/25
BSC 101 Helms Week 6 Lecture Notes 9/21-9/25 BSC 101
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This 4 page Class Notes was uploaded by Daniel Hemenway on Sunday September 27, 2015. The Class Notes belongs to BSC 101 at Illinois State University taught by Dr. Helms in Summer 2015. Since its upload, it has received 57 views. For similar materials see Concepts in Biology in Biological Sciences at Illinois State University.
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Date Created: 09/27/15
BSC 101 Helms 921925 Chapter 4 Coursepack Notetaking Guides Page 100 Habitat All of the biotic living and abiotic nonliving factors that surround and influence an organism Micro vs Macrohabitat Micro small immediate vicinity of organism Macro big Coursepack Notetaking Guides Page 101 When we look at habitat regionally we examine Life Zones Life zones Broad geographical areas with similar physical characteristics and have comparable plants and animals found there Also known as Biome Oceanic life zones are categorized by Depth of light penetration Distance from the shore Coursepack Notetaking Guides Page 102 Terrestrial life zones are characterized by the type of vegetation found there The type of vegetation is influenced by moisture rainfall and temperature Coursepack Notetaking Guides Page 103 Type of vegetation is determined by Latitude Altitude Moisture Coursepack Notetaking Guides Page 104 The smallscale view of habitat is to examine microhabitat features might include Biotic Factors Food access Predators Mates Competition for Disease Parasites Soil Other species competing for something BSC 101 Helms 921925 Abiotic environmental Factors Sunlight Water Temperature Soil Moisture Oxygen Gravity Coursepack Notetaking Guides Page 106 Resources necessary substances required by organisms in that habitat that are provided by are provided by that habitat All organisms have a minimum set of required resources Changes over life cycle of all organisms Time limiting resources Different species have different resource requirements How well adapted they are adapted to that environment Coursepack Notetaking Guides Page 107 Resources limit or promote growth and reproduction Constraint resource at suboptimal levels that brings out a change in an organism that it needs to survive Tradeoff specific behavioral or metabolic shift that is coming up as a result of a constraint What resources might be in limitation in a habitat like this Grass food because of snow What resources might be in abundance VVater Coursepack Notetaking Guides Page 108 Each species occupies its specific ecological niche Niche Organism s range of habitat conditions and resources needed along with the interactions that species engages in for survival and reproduction A niche can be narrow or broad Example of a species with a narrow niche Redwood Example of a species with a broad niche Pigeons An understanding of an organism s niche can be useful for conservation Example Things it need to survive BSC 101 Helms 921925 Coursepack Notetaking Guides Page 109 Environmental factors can vary over timeseasonal changes in Temperature Day length Rainfall Natural Disturbances This can alter resource availability there are several adaptations that organisms have to deal with this Dormancy True suspension of growth reproduction development Seek temporary environmental changes Survival Strategy Can be reversed when conditions improve Hibernation Patterns that are repeated seasonally metabolic processes are slowed Survival strategy Hibernation vs Dormancy Hibernation decreases in many things but it s not a suspension Coursepack Notetaking Guides Page 110 Migration Change the behavior and go somewhere else Really costly resource expenditure Really costly if predators know when they re coming Artic Terns Monarch Butterflies Can be triggered by Changes in local climate Food availability Season daylight Hormones Coursepack Notetaking Guides Page 111 Disturbance Range of physical events environmental conditions that change a local environment Can be biotic or abiotic Infestations as well Change ability of native organisms to obtain resources Opportunistic Organisms Take advantage of what is left after a disturbance to an environment BSC 101 Helms 921925
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