After several job applications, I finally got to get an interview for a tutor position. However, this time the interview was a bit different than all the others I had attended as a viewer. Most interviews were, as a rule, a presentation of the candidate skills and experience matching the job description. Mine had to be different, and more challenging.
The rules:
Fifteen-minute presentation of a lecture on one of 3 subjects, aiming at level 1 students; followed by 10 minutes presentation of my CV.
Here it is. Ohh, and by the way, I got the job.
Back on Track: Navigating the Return to Work after Parental Leave
Job interview power Point
1. 25 minute presentation
The first 15 minutes
aimed at year 1 students (around 180 student)
on one of the following topics:
1) The Mitochondrion
2) Polychaete feeding strategies
3) Ecology of a species adapted to an extreme environment
.
The remaining 10 minutes
should consider how you would contribute to
the teaching and management of SU Biosciences
taught programmes (foundation to masters)
1
DR SARA BARRENTO
Tutor in Biosciences (Job Number AC01202)
7. Polar regions
Alpines regions
Low temperatures High Pressure
Oceans depthsHot springs
Hydrothermal vents
Hot deserts
High temperatures
Severe drought
Deserts
Lack of water
Acid mine waste
The stomach
Soda Lakes
Acidic or alkaline
Polluted areas
Volcano
Toxic elements
Salt lakes
High salt
Decomposing
matter
Estuarine muds
Vertebrate intestine
No Oxygen
UV
Nuclear disaster
Radiation
7
8. Criteria used by some authors to
avoid the anthropocentric view:
An environment
dominated by an
extreme condition
SALINITY in Salt lakes
Small areas that are
rare compared to
other types
CAVES, HOT
SPRINGS
Organisms must
have:
• Morphological
structures
• Biochemical
mechanism
not found in most
related species
Low species
richness number of
species present in a
defined geographic
unit
8
9. Extremophile organisms
(from Latin extremus meaning "extreme"
and Greek philiā meaning "love")
Halophile
An organism that loves saline environments
Acidophile
An organism that loves acidic environments
usually has optimal growth at pH <3
Alkaliphile
An organism that loves alkaline environments
usually has optimal growth at pH >9
9
10. Extremophiles
Salt lake 4000 m altitude
Atacama Desert, Chile
So who lives
here?
Crustacean
Artemia spp.
Salinity
concentration g/L
Salt
lake
35 g/L
s
w
240 g/L
a
.b
.c.
1. High UV and light intensity
2. Temperature range
6-35⁰C3. High salinity
4. Low oxygen
10
11. Kingdom Animalia
Phylum Arthropoda
Subphylum Crustacea
Genus Artemia
Artemia tunisiana (Europe and North Africa)
Artemia species (America, part of Europe, Asia)
Artemia franciscana (America, part of Europe)
Artemia parthenogenetica (Europe, Africa, Asia
Australia)
Artemia sinica (Central Asia, China)
Artemia persimilis (Argentina)
Artemia urmiana (Iran)
8-10 mm
~10-12
mm
claspers
11
Common names:
artemia or brine
shrimp
13. Extremophiles
1. Adaptation to LOW OXYGEN
13
Adaptations to salt lake environment
2. Adaptations to HIGH SALINITY
3. Adaptation to CHANGING
ENVIRONMENT
15. Extremophiles
2. Adaptations to HIGH
SALINITY
Two salt pumps to pump salt out:
1. Salt pump in the gills
2. Neck gland
Artemia control how much salt they let into their body
tissues better than any other organism in the world
When water is highly salty,
the pumps work harder and
have a higher output
When the water is less saline,
the pumps slow in order to
retain some salts within the
shrimp 15
16. Ovoviviparo
us animals retain
eggs inside the
uterus until
embryonic
development is
fully completed
3. Adaptation to changing environment
Oviparous animals
lay eggs, with little or no
other embryonic
development within the
mother
CYST
S
http://www.leloft.co.uk/artemia.html
16
19. SUMMARY
What are extremophiles?
Organisms that live in extreme
environments
3 examples were given:
Acidophile
Alkaliphile
Halophile
What are extreme environments?
1. Dominated by an extreme condition
2. Organisms have specific adaptations
3. Low species richness
4. Relative small geographic scale
19
20. SUMMARY
Ecology of Artemia to salt lakes
1. Artemia are filter feeders
2. Artemia are eaten by birds
Adaptations to salt lake environments:
1. Three haemoglobins to bind oxygen
2. Two salt pumps to excrete excess salts
3. Reproduction strategy
20
21. 21
Essential reading
Begon, M., Townsend, R.C.,
Harper, J.L. (2006). Ecology,
from individuals to
ecosystems. Blackwell
Publishing, UK. 738 p.
Randall, D. J., Burggren, W.
W., French, K., & Eckert, R.
(2002). Eckert animal
physiology: Mechanisms and
adaptations. New York: W.H.
Freeman and Co.
Schmidt-Nielsen, K.
(1997). Animal physiology:
Adaptation and environment.
Cambridge [England:
Cambridge University Press.
Great Salt Lake ecosystem
Program
http://
wildlife.utah.gov/gsl/brineshr
Further reading
Wharton, D.A. (2002) Life at the
Limits. Organisms in Extreme
Environments. Cambridge University
Press
Salt Lake brine shrimp
http://saltlakebrineshrimp.com/about-
brine-shrimp
/
FAO. Artemia spp. Cultured aquatic
species information programme
http://
www.fao.org/fishery/culturedspecies/
Artemia_spp/en
Laboratory of aquaculture and
artemia reference centre
http://www.aquaculture.ugent.be/ind
ex.htm
22. Image Credits
Slide 2,4,9,10, 11, 12,13 19 – Images by Sara
Barrento
Slide 3 – Getty Images
Slide 5
Acid mine waste http://
www.h2ogeo.upc.es/proyectos/atrapo/Atrapocastel
lano.html
Fukushima is here
http://www.fukuleaks.org/web/?p=12450
Slide 7- Image by Andre Pires
Slide 14 www.leloft.co.uk/artemia.html
Slide 15 http://www.artemiaworld.com/home/
Slide 16 – Image by Doc Searls
Slide 19 – Image by Sara Barrento
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