Utilities of edge-based metrics for studying landscape fragmentation

Landscape fragmentation associated with human activities poses serious threats to conservation of the Earth's natural ecosystems. A central issue in landscape fragmentation is the ecological effect of habitat edges, but edge characteristics and associated metrics have not been widely used in landscape fragmentation studies. This study explored the utility of edge-based metrics in quantifying landscape fragmentation using simulated artificial landscapes and a real-world example of landscape fragmentation in southwest China's Wolong Nature Reserve. Results from artificial landscape simulations demonstrate that edge-based landscape metrics are effective measures of landscape fragmentation, capturing important aspects of landscape fragmentation not detected by patch-based metrics. The landscape of the reserve has become more fragmented due mostly to effects of past reforestation efforts and of sustained human disturbances at lower elevations during the study period. This paper illustrates that the use of edge-based metrics, in conjunction with patch-based metrics, can provide more comprehensive information on the patterns and dynamics of landscape changes, and thus facilitate the assessment and monitoring of landscape fragmentation and restoration.

[1]  Ingrid Sarlöv Herlin,et al.  Dispersal of woody plants in forest edges and hedgerows in a Southern Swedish agricultural area: the role of site and landscape structure , 2000, Landscape Ecology.

[2]  R. Rosenfield,et al.  SPECIES-SPECIFIC EDGE EFFECTS ON NEST SUCCESS AND BREEDING BIRD DENSITY IN A FORESTED LANDSCAPE , 2001 .

[3]  Ronald E. Masters,et al.  Landscape cover type and pattern dynamics in fragmented southern Great Plains grasslands, USA , 2001, Landscape Ecology.

[4]  R. O'Neill,et al.  Landscape Ecology Explained@@@Landscape Ecology in Theory and Practice: Pattern and Process , 2001 .

[5]  Peter W. C. Paton,et al.  The Effect of Edge on Avian Nest Success: How Strong Is the Evidence? , 1994 .

[6]  R. O'Neill,et al.  Lacunarity indices as measures of landscape texture , 1993, Landscape Ecology.

[7]  Therese M. Donovan,et al.  Variation in Local-Scale Edge Effects: Mechanisms and landscape Context , 1997 .

[8]  Hu Jinchu,et al.  The Giant Pandas of Wolong , 1985 .

[9]  Malcolm L. Hunter,et al.  Effects of Silvicultural Edges on the Distribution and Abundance of Amphibians in Maine , 1998 .

[10]  J. Reynolds,et al.  A new contagion index to quantify spatial patterns of landscapes , 1993, Landscape Ecology.

[11]  Robert H. Jones,et al.  Distribution of the red imported fire ant, shape Solenopsis invicta, in road and powerline habitats , 1998, Landscape Ecology.

[12]  J. R. Runkle,et al.  Factors Influencing Species Composition in Canopy Gaps: The Importance of Edge Proximity in Hueston Woods, Ohio , 1997 .

[13]  J. Kollmann,et al.  Landscape structure and diversity of fleshy-fruited species at forest edges , 1999, Plant Ecology.

[14]  J. Metzger.  TREE FUNCTIONAL GROUP RICHNESS AND LANDSCAPE STRUCTURE IN A BRAZILIAN TROPICAL FRAGMENTED LANDSCAPE , 2000 .

[15]  R. Forman.  Land Mosaics: The Ecology of Landscapes and Regions , 1995 .

[16]  G. J. Carsjens,et al.  Fragmentation and Land-Use Planning—An Introduction , 2002 .

[17]  F. D. Pineda,et al.  A fragmented landscape in northern Spain analyzed at different spatial scales: Implications for management , 1997 .

[18]  Santiago Saura,et al.  Landscape patterns simulation with a modified random clusters method , 2000, Landscape Ecology.

[19]  Bruce T. Milne,et al.  Effects of changing spatial scale on the analysis of landscape pattern , 1989, Landscape Ecology.

[20]  J. Metzger,et al.  Characterizing the complexity of landscape boundaries by remote sensing , 1996, Landscape Ecology.

[21]  I. Turner.  Species loss in fragments of tropical rain forest: a review of the evidence. , 1996 .

[22]  J. Wisniewski,et al.  Forest fragmentation : wildlife and management implications , 1999 .

[23]  T. Lovejoy,et al.  ECOLOGICAL IMPACTS OF FOREST FRAGMENTATION IN CENTRAL AMAZONIA , 1998 .

[24]  R. Rosenfield,et al.  Effects of Forest Edges on Ovenbird Demography in a Managed Forest Landscape , 2001 .

[25]  D. Wilcove,et al.  Forest Island Dynamics in Man-Dominated Landscapes , 1981 .

[26]  D. Sui,et al.  Modeling the dynamics of landscape structure in Asia's emerging desakota regions : a case study in Shenzhen , 2001 .

[27]  Sharon K. Collinge,et al.  Ecological consequences of habitat fragmentation: implications for landscape architecture and planning , 1996 .

[28]  F. D. Pineda,et al.  Influence of landscape complexity and land management on woody plant diversity in northern Spain , 1994 .

[29]  X. Wu,et al.  Light distribution in mesic grasslands: Spatial patterns and temporal dynamics , 2001 .

[30]  R. H. Giles,et al.  An analysis of deforestation: Metrics used to describe pattern change , 1999 .

[31]  J. Bogaert,et al.  Twist number statistics as an additional measure of habitat perimeter irregularity , 1999, Environmental and Ecological Statistics.

[32]  David O. Wallin,et al.  Rates and patterns of landscape change between 1972 and 1988 in the Changbai Mountain area of China and North Korea , 1997, Landscape Ecology.

[33]  Mary L. Cadenasso,et al.  Linking forest edge structure to edge function: mediation of herbivore damage , 2000 .

[34]  M. Kent,et al.  Landscape and plant community boundaries in biogeography , 1997 .

[35]  J. Bissonette,et al.  The behavior of landscape metrics commonly used in the study of habitat fragmentation , 1998, Landscape Ecology.

[36]  Robert C. Frohn,et al.  Remote Sensing for Landscape Ecology: New Metric Indicators for Monitoring, Modeling, and Assessment of Ecosystems , 1998 .

[37]  Jiquan Chen,et al.  Effects of edges on plant communities in a managed landscape in northern Wisconsin , 2001 .

[38]  J. Gardner.  Experimental evidence for edge-related predation in a fragmented agricultural landscape , 1998 .

[39]  T. Thurow,et al.  Fragmentation and changes in hydrologic function of tiger bush landscapes, south‐west Niger , 2000 .

[40]  S. Robinson,et al.  Predator activity and predation on songbird nests on forest-field edges in east-central Illinois , 2004, Landscape Ecology.

[41]  C. Ozanne,et al.  Edge effects and tropical forest canopy invertebrates , 2001, Plant Ecology.

[42]  Daolan Zheng,et al.  Edge effects in fragmented landscapes: a generic model for delineating area of edge influences (D-AEI) , 2000 .

[43]  M.-J. Fortin,et al.  Issues related to the detection of boundaries , 2000, Landscape Ecology.

[44]  G. Mroz,et al.  Microclimate in Forest Ecosystem and Landscape Ecology , 1999 .

[45]  R. Knight.  Forest Fragmentation in the Southern Rocky Mountains , 1999 .

[46]  S. Pickett,et al.  Effect of Edge Structure on the Flux of Species into Forest Interiors , 2001 .

[47]  K. McGarigal,et al.  FRAGSTATS: spatial pattern analysis program for quantifying landscape structure. , 1995 .

[48]  Bruce T. Milne,et al.  Indices of landscape pattern , 1988, Landscape Ecology.

[49]  T. O. Crist,et al.  Experimental effects of habitat fragmentation on rove beetles and ants: patch area or edge? , 2000 .

[50]  M. Turner.  Spatial and temporal analysis of landscape patterns , 1990, Landscape Ecology.

[51]  W. Hargrove,et al.  Lacunarity analysis: A general technique for the analysis of spatial patterns. , 1996, Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics.

[52]  Sharon K. Collinge,et al.  A conceptual model of land conversion processes: predictions and evidence from a microlandscape experiment with grassland insects , 1998 .

[53]  William F. Laurance,et al.  Biomass Collapse in Amazonian Forest Fragments , 1997 .

[54]  W. Z. Lidicker.  Responses of mammals to habitat edges: an overview , 1999, Landscape Ecology.

[55]  Sophia M. Gehlhausen,et al.  Vegetation and microclimatic edge effects in two mixed-mesophytic forest fragments , 2004, Plant Ecology.

[56]  Edge effects and tropical forest canopy invertebrates , 2001 .

[57]  R. Ostfeld,et al.  Responses of a small mammal community to heterogeneity along forest-old-field edges , 1999, Landscape Ecology.

[58]  Chris Cosner,et al.  How Habitat Edges Change Species Interactions , 1999, The American Naturalist.