Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Island restoration wikipedia , lookup
Storage effect wikipedia , lookup
Biodiversity action plan wikipedia , lookup
Biogeography wikipedia , lookup
Ecological fitting wikipedia , lookup
Natural environment wikipedia , lookup
Theoretical ecology wikipedia , lookup
Coevolution wikipedia , lookup
Molecular ecology wikipedia , lookup
Chpt.4 Environmental Science Life Characteristics Organization Ecosystems Ecosystems / Evolution Diversity of Life Characteristics of Life • Circulation transport of materials within the body • Locomotion movement • Adaptation • Reproduction • Respiration • Lifespan, Stage in Life • Growth Repair and Maintenance • Response to the Environment • Energy Use• Organization • Composed of cells Organization • Cells (Prokaryotic) • Quarks, Leptons and Neutrinos • Electrons • Protons, Neutrons • Atoms • Molecules, Compounds • Virus • Rickettsia and Mycoplasms • Cell (Eukaryotic) organelles • Cell (Eukaryotic) • Tissue • Organs • Organ Systems • Organisms, Species • Populations • Communities • Ecosystems • Biomes • Biosphere • Solar system • Galaxy • Universe (Made of Q,L,N) Ecosystem • Ecosystems- all of the organisms living within a specified area and the abiotic factors • Abiotic-non living factors, streams, soils, rocks • Biotic-living factors Interconnections • Organism-individual living thing • Species-a group of organisms that can interbreed successfully • Population-are the member of a species in a specific area in a specific time. • Community are populations that live together in the same specific area • Ecosystem is a community of organism and the non living factors in a certain area. Habitat • A habitat is a areas or situation where certain organism live. • Niche- description of either the role played by a species in a community, or the total set of environmental factors that determine that species distribution. • Most habitats have specific abiotic conditions and specific biota. • Most organism are well adapted to their specific habitat • Harsher environmental conditions make the organisms specifically adapted for those conditions. Who Live Where and Why? • Why does a particular species live where it lives? • How is it able to live where it does? • How does it deal with the physical resources of its environment? • How does it interact with other species present? • What gives one species an edge over another species in a particular habitat? Critical Factors and Tolerance Limits • Every organism has limits to the environmental condition it can endure. • Environmental factors must with in appropriate levels for life to persist. – Temperature – Moisture levels – Nutrient supply – Soil and water chemistry – Living space Evolution • Evolution is the gradual change in the genetic characteristics of a population over a long period of time. • Natural Selections- Nature selects for certain characteristics over other. Survival and reproduction was a big point in Darwin/Wallace theory of Evolution. Natural Selection, Adaptation, and Evolution • Species acquire traits that allow them to be adapted to their environment • The term adapt can be used in two ways – Acclimation:limited range of physiological modifications available to individual organisms • Individuals can adapt to a certain degree, but change is not permanent • Changes cannot be passed to offspring – Evolution:Operates at the population level, brought about by inheritance of specific genetic traits that allow specific genetic traits that allow species to live in a particular environment Change • Species (populations) change gradually through two mechanisms – Competition for scarce resources – Natural selection members of a population that are best suited for a particular environment will survive and produce offspring more successfully than their ill-suited competitors • Acts on preexisting genetic diversity created by a series of small, random mutations that occur spontaneously in every population. • Where resources are limited or environmental conditions place some of the selective pressure in a population, individuals with those advantageous traits become more abundant in the population, and the species gradually evolves or becomes better suited to that environment • Examples of natural selection;European pepper moth, finches as observed by Darwin, Environmental Factors that cause Selective Pressure • Environmental factors that cause selective pressure and influence survivorship or fertility in nature. – Physiological stress – Predation including parasitism and disease – Competition – Luck Law of Competitive Exclusion • No two species will occupy the same niche and compete for exactly the resources in the same habitat for very long. Coevolution • Coevolution is the process of two species changing genetically in response to long term interactions with each other • The Yucca moth was predicted long before it became a fact. Artificial Evolution • Artificial Evolution is when you have changes done not for natural selection but due to the whims of humans. • Horse Breeders, Dog Breeders Resistance • Resistance-is the ability of organisms to tolerate a particular chemical designed to kill it • DDT-Insects • Antibiotic resistant bacteria MRSA (Staph aureous) Buzz Aldredge, Jack Snow, Mike Martz Isolation • Given enough geographic isolation or selective pressure, members of a population can become so different from their ancestors that they can be considered a new species that has replaced the old • Alternatively, isolation of population subsets by geographic or behavior factors that prevent exchange of genetic material can result in branching off of new species that coexist with their parental line. • Convergent evolution unrelated organisms coming to look and act very much alike due to natural selection and adaptations(bat, butterfly, bird) • Divergent evolution related species fan out and adapt to other environments, don’t appear to be similar. Taxonomy History • Botanist-herbalist- use the correct medicine, aspirin-willow, snake bite cure • Aristotle-2000 years ago classified about 1000 organisms, divided into 2 groups plants and animals. The subdivision was habitat land, sea, air • Linnaeus, Carolus, used structure and used a two-name system called binomial nomenclature. Names • • • • Use only Genus species variety Italicize name if written Underline both genus and species Genus is capitalized, species is small Modern Evolutionary Classification • Similarities-Fins, bones, fins, covering, lungs, gills • Evolutionary Classification-evolutionary history, phylogeny. Grouping of organisms with a similar ancestor. • Cladograms-is a diagram that shows the evolutionary relationship among a group of organisms. Derived characters show up in newer members but not in older members • Similar Genes • DNA evidence • Molecular clock-mutations in DNA Hierarchical System of Nomenclature • Domain-Archaea, Bacteria, Eukarya • Kingdom- Plant, Animal, Fungi, Protistia, Archaebacteria, Eubacteria • Phylum-Division (plants only) • Class • Order • Family • Genus • species Domain Bacteria • • • • Cells, unicellular, prokaryotic Thick cell wall of peptidoglycan Free living or parasitic Aerobic, anaerobic Domain Archaea • Cells unicellular, prokaryotic • Harsh environment • anaerobic Domain Eukarya • Cells are eukaryotic, more complex, larger • Organelles, mitochondria, chloroplast, Endoplasmic reticulum • Cell have DNA in the nucleus Protistia • • • • Cells eukaryotic, unicellular, multicellular Plant, algae Animal Fungi, water fungi Fungi • Cell eukaryotic, chitin cell wall, singular, multicellular • Feed on dead or decaying organic matter. • Heterotroph, secretes enzymes, and absorbs molecules. Plantae • Cells eukaryotic, cell wall of cellulose, multicellular • Photosynthetic autotrophs • Nonmotile • Mosses, Ferns Cone-bearing, flowering, plants Animalia • Cells eukaryotic, no cell wall, multicellular. • Motion at least during some part of life cycle. • Heterotrophic