1 / 15

Jim Dombroskie

Jim Dombroskie. Born in K-W Attended high school at Eastwood Collegiate Worked for a couple of years Attended Sir Sandford Fleming Hope to graduate from here (someday!) Work for Crone geophysics. DIATOMS. What are they?. One celled organism Solitary or colonial Siliceous

dahlia
Download Presentation

Jim Dombroskie

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Jim Dombroskie • Born in K-W • Attended high school at Eastwood Collegiate • Worked for a couple of years • Attended Sir Sandford Fleming • Hope to graduate from here (someday!) • Work for Crone geophysics

  2. DIATOMS

  3. What are they? • One celled organism • Solitary or colonial • Siliceous • Planktic and Benthic forms • Over 60 000 species • Can be found in almost any moist place • Eukaryotic Grovea pedalis

  4. Environment • Freshwater -puddle -ditch -tree (moss) -lagoon, river, etc • Marine -benthic and planktic areas

  5. Diatom Morphology • Frustule (skeleton) -hypotheca -epitheca -can have varying shapes • Punctae • Raphe (groove) • No flagella

  6. Classification • Phylum Bacillariophyta • Class Diatomatae • Order Centrales • Order Pennales • Although some put it in the phylum Chrysophyta

  7. Order Centrales • Centric • Dominate marine environments • Cret. To Rec. • Radially symmetrical -although they can have varying shapes

  8. Order Pennales • Pennate (elongate) • Dominate non-marine environments • Paleocene to Recent • Bilaterally symmetrical -features perpendicular to long axis

  9. Reproduction • Asexual • Mitosis • Alternation between both • Progressive decrease in size

  10. Reproduction • Sexual • Meiosis • Gametes released and combined with another • Zygote

  11. Importance • Responsible for 20%-25%of all carbon fixation (CO2 + H2O = sugars) • Contribute to atmospheric oxygen • Major component of plankton (source of food for many organisms • Age dating (many have short time ranges) • Dynamite, abrasive, filter, etc. • Grass of the Sea

  12. Hazardous • genus Pseudonitzschia • Domoic acid • binds to the glutamate receptors in the brain where it causes nerve cells to transmit impulses continuously until the cells die • eutrophication processes occurring along our coasts some algae (diatoms!) blooms have caused mass pollution and starvation.

  13. References • http://hjs.geol.uib.no/diatoms/Marbles/index.html-ssi • http://www.microscopy.fsu.edu/primer/techniques/hoffmangallery/diatom.html • http://hjs.geol.uib.no/diatoms/ • http://www.visualsunlimited.com/browse/vu315/vu315607.html • http://earth.leeds.ac.uk/electronoptics/set3/diatom_c.htm • http://www.ucmp.berkeley.edu/chromista/diatoms/diatommm.html

More Related