Mosses Like It Rough—Growth Form Specific Responses of Mosses, Herbaceous and Woody Plants to Micro-Relief Heterogeneity

Micro-relief heterogeneity can lead to substantial variability in microclimate and hence niche opportunities on a small scale. We explored the relationship between plant species richness and small-scale heterogeneity of micro-relief on the subtropical island of La Palma, Canary Islands. Overall, we sampled 40 plots in laurel and pine forests at four altitudinal bands. Species richness was recorded separately for various growth forms (i.e., mosses, herbaceous and woody plants). Site conditions such as altitude, slope, aspect, and tree density were measured. Micro-relief heterogeneity was characterized by surface structure and a subsequently derived surface heterogeneity index. The effect of micro-relief heterogeneity on species richness was analysed by means of linear mixed effect models and variance partitioning. Effects of micro-relief heterogeneity on species richness varied considerably between growth forms. While moss richness was affected significantly by micro-relief heterogeneity, herbaceous and woody plants richness responded mainly to larger-scale site conditions such as aspect and tree density. Our results stress the importance of small-scale relief heterogeneity for the explanation of spatial patterns of species richness. This poses new challenges as small-scale heterogeneity is largely underrepresented, e.g. with regard to its application in species distribution models.

[1]  J. P. Grime,et al.  A QUANTITATIVE ANALYSIS OF SHOOT PHENOLOGY AND DOMINANCE IN HERBACEOUS VEGETATION , 1977 .

[2]  S. Vicca,et al.  Do global change experiments overestimate impacts on terrestrial ecosystems? , 2011, Trends in ecology & evolution.

[3]  Klara Dolos,et al.  Current measures for distance decay in similarity of species composition are influenced by study extent and grain size , 2012 .

[4]  R. Macarthur,et al.  The Theory of Island Biogeography , 1969 .

[5]  Ali Saleh,et al.  Soil roughness measurement: Chain method , 1993 .

[6]  Christian Körner,et al.  Infra‐red thermometry of alpine landscapes challenges climatic warming projections , 2009 .

[7]  R. Moral,et al.  The influence of microrelief on community structure of subalpine meadows , 1984 .

[8]  Lynn M. Resler,et al.  Topographic Shelter and Conifer Establishment and Mortality in an Alpine Environment, Glacier National Park, Montana , 2005 .

[9]  G. Yohe,et al.  A globally coherent fingerprint of climate change impacts across natural systems , 2003, Nature.

[10]  Kurt H. Riitters,et al.  Topographic controls on the regional‐scale biodiversity of the south‐western USA , 2004 .

[11]  J. Lundholm.  Plant species diversity and environmental heterogeneity: spatial scale and competing hypotheses , 2009 .

[12]  O. Phillips,et al.  Extinction risk from climate change , 2004, Nature.

[13]  J. Lyon,et al.  Structure of herbaceous plant assemblages in a forested riparian landscape , 1998, Plant Ecology.

[14]  G. Evelynhutchinson,et al.  Population studies: Animal ecology and demography , 1991 .

[15]  Jacqueline de Chazal,et al.  Climate change 2007 : impacts, adaptation and vulnerability : Working Group II contribution to the Fourth Assessment Report of the IPCC Intergovernmental Panel on Climate Change , 2014 .

[16]  D. J. Chadwick,et al.  Analysis of LiDAR-derived topographic information for characterizing and differentiating landslide morphology and activity , 2006 .

[17]  Dazhong Wen.  Land Mosaics: The Ecology of Landscapes and Regions , 1997 .

[18]  Carlos Henrique Grohmann,et al.  Multiscale Analysis of Topographic Surface Roughness in the Midland Valley, Scotland , 2011, IEEE Transactions on Geoscience and Remote Sensing.

[19]  G. Decocq.  Patterns of plant species and community diversity at different organization levels in a forested riparian landscape , 2002 .

[20]  P. Legendre,et al.  vegan : Community Ecology Package. R package version 1.8-5 , 2007 .

[21]  Pierre Legendre,et al.  Studying beta diversity: ecological variation partitioning by multiple regression and canonical analysis , 2008 .

[22]  M. Hutchings,et al.  TOWARD UNDERSTANDING THE CONSEQUENCES OF SOIL HETEROGENEITY FOR PLANT POPULATIONS AND COMMUNITIES , 2003 .

[23]  James H. Brown,et al.  The Influence of Geomorphological Heterogeneity on Biodiversity  II. A Landscape Perspective , 1998 .

[24]  W. Nezadal,et al.  Lokalendemiten und Phytodiversität der westkanarischen Inseln La Palma und La Gomera , 1999 .

[25]  K. Anderson,et al.  The role of canopy gaps in maintaining vascular plant diversity at a forested wetland in New York State1 , 2002 .

[26]  C. Körner,et al.  Topographically controlled thermal‐habitat differentiation buffers alpine plant diversity against climate warming , 2011 .

[27]  J. Palutikof,et al.  Climate change 2007 : impacts, adaptation and vulnerability , 2001 .

[28]  Y. Malhi,et al.  Upslope migration of Andean trees , 2011 .

[29]  G. Decocq.  The ‘masking effect’ of silviculture on substrate-induced plant diversity in oak-hornbeam forests from northern France , 2000, Biodiversity & Conservation.

[30]  C. Beierkuhnlein,et al.  Characteristic Pattern of Species Diversity on the Canary Islands , 2010 .

[31]  M. C. Grant,et al.  EVOLUTIONARY SIGNIFICANCE OF LOCAL GENETIC DIFFERENTIATION IN PLANTS , 1996 .

[32]  D. Burslem,et al.  Habitat preferences of Aporosa in two Malaysian forests: Implications for abundance and coexistence , 2002 .

[33]  J. Metzger,et al.  Relief influence on tree species richness in secondary forest fragments of Atlantic Forest, SE, Brazil , 2008 .

[34]  Stephen J. Hawkins,et al.  The area‐independent effects of habitat complexity on biodiversity vary between regions , 2003 .

[35]  C. Beierkuhnlein,et al.  Increase of island endemism with altitude – speciation processes on oceanic islands , 2012 .

[36]  B. Huntley,et al.  Habitat microclimates drive fine‐scale variation in extreme temperatures , 2011 .

[37]  Clemens Eisank,et al.  Local variance for multi-scale analysis in geomorphometry , 2011, Geomorphology.

[38]  D. Larson,et al.  Microtopographic control of vascular plant, bryophyte and lichen communities on cliff faces , 2006, Plant Ecology.

[39]  C. Humphries,et al.  Diversity, rarity and the evolution and conservation of the Canary Islands endemic flora , 2008 .

[40]  Jesus J. Fuensalida,et al.  Comparison of the aerosol index from satellites and the atmospheric extinction coefficient above the Canarian Observatories , 2004, SPIE Astronomical Telescopes + Instrumentation.

[41]  Gabriela Hofer,et al.  Effects of topographic variability on the scaling of plant species richness in gradient dominated landscapes , 2008 .

[42]  K. Triantis,et al.  Island biogeography is not a single‐variable discipline: the small island effect debate , 2012 .

[43]  J. Fernández-Palacios,et al.  Altitudinal pattern of vegetation variation on Tenerife , 1995 .

[44]  J. Wilson,et al.  Cover plus: ways of measuring plant canopies and the terms used for them , 2011 .

[45]  S. W. Beatty.  Influence of Microtopography and Canopy Species on Spatial Patterns of Forest Understory Plants , 1984 .

[46]  Distribution of endemic plant species on an oceanic island : a geospatial analysis of La Palma (Canary Islands) , 2011 .

[47]  M. Glemnitz,et al.  Quantifying geomorphological heterogeneity to assess species diversity of set-aside arable land , 2004 .

[48]  Omri Allouche,et al.  Integrating the Effects of Area, Isolation, and Habitat Heterogeneity on Species Diversity: A Unification of Island Biogeography and Niche Theory , 2007, The American Naturalist.

[49]  B. Glaser,et al.  The influence of Saharan dust deposits on La Palma soil properties (Canary Islands, Spain) , 2013 .

[50]  Christian Körner,et al.  GIS-analysis of tree-line elevation in the Swiss Alps suggests no exposure effect , 2001 .

[51]  Anke Jentsch,et al.  The Search for Generality in Studies of Disturbance and Ecosystem Dynamics , 2001 .

[52]  M. Araújo,et al.  The island immaturity – speciation pulse model of island evolution: an alternative to the “diversity begets diversity” model , 2007 .

[53]  P. White,et al.  Scale Dependence and the Species-Area Relationship , 1994, The American Naturalist.

[54]  Andrew M. Sugden.  Diversity Begets Diversity , 2001, Science.