\begin{thebibliography}{20}
\providecommand{\natexlab}[1]{#1}
\providecommand{\url}[1]{\texttt{#1}}
\expandafter\ifx\csname urlstyle\endcsname\relax
  \providecommand{\doi}[1]{doi: #1}\else
  \providecommand{\doi}{doi: \begingroup \urlstyle{rm}\Url}\fi

\bibitem[Culman et~al.(2010)Culman, {Young-Mathews}, Hollander, Ferris,
  {S\'{a}nchez-Moreno}, {O'Geen}, and Jackson]{culman2010}
S.~Culman, A.~{Young-Mathews}, A.~Hollander, H.~Ferris,
  S.~{S\'{a}nchez-Moreno}, A.~{O'Geen}, and L.~Jackson.
\newblock Biodiversity is associated with indicators of soil ecosystem
  functions over a landscape gradient of agricultural intensification.
\newblock \emph{Landscape Ecology}, 25\penalty0 (9):\penalty0 1333--1348,
  November 2010.
\newblock ISSN 0921-2973.
\newblock URL \url{http://dx.doi.org/10.1007/s10980-010-9511-0}.

\bibitem[Duque et~al.(2007)Duque, Ramos, and Suri\~{n}ach]{duque2007}
J.~C. Duque, R.~Ramos, and J.~Suri\~{n}ach.
\newblock Supervised regionalization methods: A survey.
\newblock \emph{International Regional Science Review}, 30\penalty0
  (3):\penalty0 195--220, July 2007.
\newblock ISSN 0160-0176.
\newblock \doi{10.1177/0160017607301605}.
\newblock URL \url{http://irx.sagepub.com/cgi/doi/10.1177/0160017607301605}.

\bibitem[Gower(1971)]{gower1971}
J.~C. Gower.
\newblock A general coefficient of similarity and some of its properties.
\newblock \emph{Biometrics}, 27\penalty0 (4):\penalty0 857--871, December 1971.
\newblock ISSN {0006-341X}.
\newblock \doi{10.2307/2528823}.
\newblock URL \url{http://www.jstor.org/stable/2528823}.

\bibitem[Guo and Wang(2011)]{guo2011}
D.~Guo and H.~Wang.
\newblock Automatic region building for spatial analysis.
\newblock \emph{Transactions in {GIS}}, 15:\penalty0 29--45, July 2011.
\newblock ISSN 13611682.
\newblock \doi{10.1111/j.1467-9671.2011.01269.x}.
\newblock URL \url{http://doi.wiley.com/10.1111/j.1467-9671.2011.01269.x}.

\bibitem[Johnston(1970)]{johnston1970}
R.~J. Johnston.
\newblock Grouping and regionalizing: some methodological and technical
  observations.
\newblock \emph{Economic Geography}, 46\penalty0 (supplement):\penalty0
  293--305, 1970.

\bibitem[Kaufman and Rousseeuw(2005)]{kaufman2005}
L.~Kaufman and P~Rousseeuw.
\newblock \emph{Finding groups in data an introduction to cluster analysis}.
\newblock Wiley,, Hoboken, {N.J.} :, 2005.
\newblock ISBN 9780471735786.

\bibitem[Patten and {Smith-Patten}(2008)]{patten2008}
M.~A. Patten and B.~D. {Smith-Patten}.
\newblock Biogeographical boundaries and {Monmonier's} algorithm: a case study
  in the northern {Neotropics}.
\newblock \emph{Journal of Biogeography}, 35\penalty0 (3):\penalty0 407--416,
  March 2008.
\newblock ISSN 0305-0270.
\newblock \doi{10.1111/j.1365-2699.2007.01831.x}.
\newblock URL \url{http://doi.wiley.com/10.1111/j.1365-2699.2007.01831.x}.

\bibitem[Proche\c{s}(2005)]{proche2005}
\c{S} Proche\c{s}.
\newblock The world's biogeographical regions: cluster analyses based on bat
  distributions.
\newblock \emph{Journal of Biogeography}, 32\penalty0 (4):\penalty0 607--614,
  March 2005.
\newblock ISSN 03050270.
\newblock \doi{10.1111/j.1365-2699.2004.01186.x}.
\newblock URL \url{http://doi.wiley.com/10.1111/j.1365-2699.2004.01186.x}.

\bibitem[Reserve(2009)]{climate2009}
Climate~Action Reserve.
\newblock Forest project protocol, version 3.1.
\newblock Technical report, Climate Action Reserve, Sacramento, {CA}, 2009.

\bibitem[Rousseeuw(1987)]{rousseeuw1987}
P~Rousseeuw.
\newblock Silhouettes: A graphical aid to the interpretation and validation of
  cluster analysis.
\newblock \emph{Journal of Computational and Applied Mathematics}, 20\penalty0
  (1):\penalty0 53--65, November 1987.
\newblock ISSN 03770427.
\newblock \doi{10.1016/0377-0427(87)90125-7}.
\newblock URL
  \url{http://linkinghub.elsevier.com/retrieve/pii/0377042787901257}.

\bibitem[Spence and Taylor(1970)]{spence1970}
N.~A. Spence and P.~J. Taylor.
\newblock Quantitative methods in regional taxonomy.
\newblock \emph{Progress in Geography}, 2:\penalty0 1--63, 1970.

\bibitem[Stooksbury and Michaels(1991)]{stooksbury1991}
D.~E. Stooksbury and P.~J. Michaels.
\newblock Cluster analysis of southeastern {U.S.} climate stations.
\newblock \emph{Theoretical and Applied Climatology}, 44\penalty0
  (3-4):\penalty0 143--150, 1991.
\newblock ISSN {0177-798X}.
\newblock \doi{10.1007/BF00868169}.
\newblock URL \url{http://www.springerlink.com/index/10.1007/BF00868169}.

\bibitem[Team(2009{\natexlab{a}})]{grass2009}
{GRASS}~Development Team.
\newblock Geographic resources analysis support system {(GRASS)} software.,
  2009{\natexlab{a}}.
\newblock URL \url{http://grass.osgeo.org/}.

\bibitem[Team(2009{\natexlab{b}})]{r2009}
R~Development~Core Team.
\newblock R: A language and environment for statistical computing,
  2009{\natexlab{b}}.
\newblock URL \url{http://www.r-project.org/}.

\bibitem[Trakhtenbrot and Kadmon(2005)]{trakhtenbrot2005}
A.~Trakhtenbrot and R.~Kadmon.
\newblock Environmental cluster analysis as a tool for selecting complementary
  networks of conservation sites.
\newblock \emph{Ecological Applications}, 15\penalty0 (1):\penalty0 335--345,
  February 2005.
\newblock ISSN 1051-0761.
\newblock \doi{10.1890/04-0077}.
\newblock URL \url{http://www.esajournals.org/doi/abs/10.1890/04-0077}.

\bibitem[{van Kooten}(2009)]{vankooten2009}
G.~C. {van Kooten}.
\newblock Biological carbon sequestration and carbon trading re-visited.
\newblock \emph{Climatic Change}, 95\penalty0 (3-4):\penalty0 449--463, April
  2009.
\newblock ISSN 0165-0009.
\newblock \doi{10.1007/s10584-009-9572-8}.
\newblock URL \url{http://www.springerlink.com/content/8372834132127434/}.

\bibitem[{Vane-Wright} et~al.(1991){Vane-Wright}, Humphries, and
  Williams]{vane1991}
{R.I.} {Vane-Wright}, {C.J.} Humphries, and {P.H.} Williams.
\newblock What to {protect?} --- systematics and the agony of choice.
\newblock \emph{Biological Conservation}, 55\penalty0 (3):\penalty0 235--254,
  January 1991.
\newblock ISSN 00063207.
\newblock \doi{10.1016/0006-3207(91)90030-D}.
\newblock URL
  \url{http://linkinghub.elsevier.com/retrieve/pii/000632079190030D}.

\bibitem[Williams et~al.(2011)Williams, Hollander, {O'Geen}, Thrupp, Hanifin,
  Steenwerth, {McGourty}, and Jackson]{williams2011}
J.~N. Williams, A.~D. Hollander, A.~T. {O'Geen}, L.~A. Thrupp, R.~Hanifin,
  K.~Steenwerth, G.~{McGourty}, and L.~E. Jackson.
\newblock Assessment of carbon in woody plants and soil across a
  vineyard-woodland landscape.
\newblock \emph{Carbon Balance and Management}, 6\penalty0 (11), 2011.

\bibitem[Wiltshire(1986)]{wiltshire1986}
{S.E.} Wiltshire.
\newblock Identification of homogeneous regions for flood frequency analysis.
\newblock \emph{Journal of Hydrology}, 84\penalty0 (3-4):\penalty0 287--302,
  May 1986.
\newblock ISSN 00221694.
\newblock \doi{10.1016/0022-1694(86)90128-9}.
\newblock URL
  \url{http://linkinghub.elsevier.com/retrieve/pii/0022169486901289}.

\bibitem[{Young-Mathews} et~al.(2010){Young-Mathews}, Culman,
  {S\'{a}nchez-Moreno}, {O'Geen}, Ferris, Hollander, and
  Jackson]{young-mathews2010}
A.~{Young-Mathews}, S.~W. Culman, S.~{S\'{a}nchez-Moreno}, A.~{O'Geen},
  H.~Ferris, A.~D. Hollander, and L.~E. Jackson.
\newblock Plant-soil biodiversity relationships and nutrient retention in
  agricultural riparian zones of the sacramento valley, california.
\newblock \emph{Agroforestry Systems}, 80\penalty0 (1):\penalty0 41--60, July
  2010.
\newblock ISSN 0167-4366.
\newblock \doi{10.1007/s10457-010-9332-9}.
\newblock URL \url{http://www.springerlink.com/content/m57j684058401536/}.

\end{thebibliography}
