Nicholas J. Gotelli

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Nov 30, 2013 (3 years and 11 months ago)

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Nicholas J.
Gotelli

Community Ecologist, Writer, Programmer, Musician


BIOL 7083 Symposium

Warwick Allen

http://www.uvm.edu/~ngotelli/homepage.html


“I
don’t do my work in order to persuade people to
conserve pitcher plants. As far as my work goes, I am
ultimately a hedonist. The real reason I do my work is
that I love it, and it’s intellectually satisfying to me.
Everything else follows
secondarily.”

Outline


Background


Pitcher plant communities


Biometrics


Music!


http://www.uvm.edu/~ngotelli/musicpage/Kaspari/Kaspari.html

Education



Ph.D.


Florida State University. 1982


1985
(advisor: Dan
Simberloff
)


M.S.


Florida State University. 1980


1982

(advisor: Lawrence
Abele
)


B.A.


University of California, Berkley. 1976


1980

http://www.skylinepictures.com/Florida_State_University_fs7_full.htm

Appointments


2000
-

present. Full Professor, Department of Biology,
University of Vermont


2008
-

2010
. Adjunct Professor,
Xishuangbanna

Tropical
Botanical Garden, Chinese Academy of Sciences


1995
-

2000. Associate Professor, Department of Biology,
University of Vermont


1992
-

1994
. Assistant Professor, Department of Biology,
University of Vermont


1988
-

1992. Assistant Professor, Department of Zoology,
University of Oklahoma


1987
-

1988. Post
-
doctoral Associate, Department of Biology,
Colorado State University


1985
-

1987. Lecturer, Department of Organismic and
Evolutionary Biology, Harvard University



Theoretical, Community, Population,
and
Experimental
Ecology


Ecological Modeling


Biostatistics


Biogeography


Invertebrate Zoology

Teaching Interests

http://www.uvm.edu/~intbiosc/?Page=Discover.html&SM=discovermenu.html

Research Interests


Food
-
webs


Community structure


Altered nutrient regimes


Extinction risk


Invasive species


Biogeography


Ecological statistics


Null models


Software development



http://biogeography.blogspot.com/2008/10/hypothesis
-
testing
-
curve
-
fitting
-
and.html

“So the other direction that food web analysis
has gone


that to me is much more satisfying


is to deliberately simplify and collapse all that
complexity; to deliberately distort nature and
pigeonhole it into a couple of key little trophic
groups of predators or consumers or parasitoids
and work out the critical linkages there”

Food Webs

Purple pitcher plant
(
Sarracenia

purpurea
)

http://highlandsbiological.org/tag/highlands
-
botanical
-
garden/

http://www.youtube.com/watch?v=bqxy0ydJMpY


http://www.uvm.edu/~ngotelli/researchpage/Research.html


Ideal study system:



Perfect for small scale
manipulative




experiments



Complete and self
-
contained



Relatively simple

(five trophic levels)


http://www.montegraphia.com/?tag=triangle
-
lake
-
bog

http://hortlog.blogspot.com/2007_11_01_archive.html


Insight into important

ecological topics:



Top
-
down
vs

bottom
-
up
forces



Trophic cascades



Community assembly rules



Extinction risk





Food Webs

Food Webs

A Series of
Sarracenia

Experiments


Sprayed nitrogen and phosphorous on pitcher plant
bogs to examine how this alters morphology (relative
keel size and relative tube diameter)


Measured changes in photosynthesis, flowering, and
population growth rates


Examined effects of prey additions, pitcher volume
alterations, and removal of top trophic level consumers


Patterns in biodiversity also investigated




Increased
anthropogenic
nitrogen from
“acid rain”
changed leaf type from
pitcher to
phyllode

leaves

http://www.uvm.edu/~ngotelli/researchpage/Research.html

Ellison &
Gotelli
, 2002a


Photosynthesis and ability to
flower increased, but population
growth rate decreased


Increased nitrogen leads to
higher extinction risk

Ellison &
Gotelli
, 2002b


Interestingly, increased nutrient input from prey had no
effect on morphology, growth rate or photosynthesis,
but changed levels of elements in plant tissue








Inquiline

communities nitrogen input is relatively low
in comparison to that from the atmosphere


May provide a reliable biological indicator of
atmospheric nitrogen deposition and saturation in
communities

Wakefield
et al.,
2005


Just begun publishing his work at the community level


Reverse
latitudinal trend in species richness (highest in
northern sites), perhaps mediated by top
-
down
processes


Buckley
et al.,
2003; Buckley
et al.,
2010;
Gotelli

et al.,
2011



Local (within population)
variation in food web
structure is higher than
continental
variation


Development of species
-
specific proteomic
indicators to determine
ecosystem health



Changes in food web structure is
predicted best by
trophic

structure models as opposed to
keystone species or habitat
models


Important to look at a wide range
of trophic interactions in order to
properly understand what is
occurring in a system


Consequences for predicting
effects of climate change, habitat
destruction, and invasive species

Gotelli

& Ellison, 2006

Books

A Primer of Ecology


Read by many students and
recommended in many ecology
courses


An excellent introduction to
ecology


Particular focus on
mathematics/modelling

http://www.bioquip.com/html/view_prodpics.asp?CatalogNum=3994C


Published in collaboration with
Aaron Ellison



Part 1:
Probability & statistical
thinking


Part 2:

Experimental design


Part 3:

Common ecological
analyses




Statistics

Ecological Statistics

http://product.51eng.com/9780878932696/A
-
Primer
-
Of
-
Ecological
-
Statistics.html

Quantifying Biodiversity:

Procedures and Pitfalls in the Measurement And
Comparison Of Species Richness


Co
-
authored by Robert Colwell


1,519 citations


Rarefaction or asymptote estimation allows for
meaningful comparisons of species richness


Led to development of
EstimateS

software


New paper (March 2012) provides an update:



Models and estimators linking individual
-
based and
sample
-
based rarefaction, extrapolation and
comparison of assemblages


Statistics

Null Models


“We
always have to ask ‘patterns
compared to what?’ In the
absence of an experimental data
set (and most data sets in ecology
are not based on experiments),
we have to have some base level
against which we compare
patterns”


Free download online!


http://vertebrates.si.edu/birds/birds_staff_pages/Garygraves_Nullmodelsbook.html


A strong proponent for the use of null models in
ecology for examining community level processes


Has published numerous papers on the subject as
well as his book



What is a null model?








A model built around randomizations of known or
imagined ecological data but with the absence of a
particular ecological mechanism


Often used to compare results against a model which
includes the mechanism (i.e. is a pattern
deterministic or stochastic?)






Gotelli

provides a highly
-
cited review of the main
uses of null models in ecology:


1.
Biodiversity measures (rarefaction)

2.
Species co
-
occurrence patterns (detection of
species interactions)

3.
Macroecology

(identify constraining boundaries
in bivariate scatterplots)








Gotelli
, 2001


Application of null models:


Meta
-
analysis examining Jared
Diamond’s assembly rules
model (1975)


Less co
-
occurrence of species
than expected by chance


Non
-
random structure greater
for
homeotherms

than
poikilotherms


Demonstrates the power of
using null models in
community ecology









Gotelli

& McCabe, 2003


EcoSim
: null models software for ecology



Developed in collaboration with Gary
Entsminger



Creates null models to look at:


-

Co
-
occurrence patterns


-

Niche overlap


-

Species diversity


-

Macroecological

patterns



EcoSimR

currently being built

Statistics

Null Models/
Ecosim

Other Software

BioGeoSim


BioGeoSim
: Biogeography software for ecologists


Developed with Gary
Entsminger
,
Carsten

Rahbek
,
and Gary Graves


Used to analyze observed species ranges against
stochastic/null models and environmental variables

Music


Easy Wind


The Littlest Birds


Gypsy Affair


Jawless Fishes


Kesey

Bear Band


Touch of Grey


Many others…



ESA meetings


The Hot
Club


http
://www.uvm.edu/~
ngotelli/musicpage/Simberloff/Simberloff.html

http://www.uvm.edu/~
ngotelli/musicpage/LittlestBirds/LittlestBirds.html

Thanks!

http://www.uvm.edu/~
ngotelli/musicpage/music.html

References

BIOL 7083

REFERENCES USED FOR NICK GOTELLI PRESENTATION


Buckley, H. L., Miller, T. E., Ellison, A. M. &
Gotelli
, N. J. (2010) Local
-

to continental
-
scale
variation in the richness and composition of an aquatic food web.
Global Ecology and
Biogeography
,
19
, 711
-
723.



Buckley, H. L., Miller, T. E., Ellison, A. M. &
Gotelli
, N. J. (2003) Reverse latitudinal trends in
species richness of pitcher
-
plant food webs.
Ecology Letters
,
6
, 825
-
829.



Colwell, R. K., Chao, A.,
Gotelli
, N. J., Lin, S
-
Y., Mao, C. X.,
Chazdon
, R. L. &
Longino
, J. T. (2012)
Models and estimators linking individual
-
based and sample
-
based rarefaction, extrapolation and
comparison of assemblages.
Journal of Plant Ecology
,
5
, 3
-
21.



Ellison, A. M. &
Gotelli
, N. J. (2002a) Nitrogen availability alters the expression of
carnivory

in
the northern pitcher plant,
Sarracenia

purpurea
.
PNAS
,
99
, 4409
-
4412.



Ellison, A. M. &
Gotelli
, N. J. (2002b) Nitrogen deposition and extinction risk in the northern
pitcher plant,
Sarracenia

pupurea
.
Ecology
,
83
, 2758
-
2765.



Gotelli
, N. J. (2001) Research frontiers in null model analysis.
Global Ecology and Biogeography
,
10
, 337
-
343
.

References

Gotelli
, N. J. (2008)
A Primer of Ecology, Fourth Edition
.
Sinauer

Associates Inc., Sunderland,
Massachusetts. 291p.



Gotelli
, N. J. & Colwell, R. K. (2001) Quantifying biodiversity: procedures and pitfalls in the
measurement and comparison of species richness.
Ecology Letters
,
4
, 379
-
391.



Gotelli
, N. J. & Ellison, A. M. (2004)
A Primer of Ecological Statistics.

Sinauer

Associates Inc.,
Sunderland, Massachusetts. 479p.



Gotelli
, N. J. & Ellison, A. M. (2006) Food
-
web models predict species abundances in response to
habitat change.
PLOS Biology
,
4
, 1869
-
1873.



Gotelli
, N. J. & Graves, G. R. (1996)
Null Models in Ecology
. Smithsonian Institution Press,
Washington D. C. 368p.



Gotelli
, N. J. & McCabe, D. J. (2002) Species co
-
occurrence: a meta
-
analysis of J. M. Diamond’s
assembly rules model.
Ecology
,
83
, 2091
-
2096.



Gotelli
, N. J., Smith, A. M., Ellison, A. M. &
Ballif
, B. A. (2011) Proteomic characterization of the
major arthropod associates of the carnivorous pitcher plant
Sarracenia

purpurea
.
Proteomics
,
11
, 2354
-
2358
.

References

Wakefield
, A. E.,
Gotelli
, N. J.,
Wittman
, S. E. & Ellison, A. M. (2005) Prey addition alters nutrient
stoichometry

of the carnivorous plant
Sarracenia

purpurea
.
Ecology
,
86
, 1737
-
1743.



INTERNET LINKS

Gotelli

Website
-

http://www.uvm.edu/~ngotelli/homepage.html

ESA Interview
-

http://sarcozona.org/2011/08/22/esa
-
interviews
-
nick
-
gotelli/