Abstract
Disentangling the contribution of corridors to landscape connectivity is crucial for adopting efficient measures in conservation, but their actual role in heterogeneous landscapes is not yet fully understood. We assessed the hypothesis that corridors, consisting of hedgerows and riparian vegetation strips, are important landscape elements promoting functional connectivity for the lingue (Persea lingue), a tree endemic to southern Chile and Argentina whose seeds are mainly dispersed by the habitat generalist austral thrush (Turdus falcklandii). For this purpose, we used empirical estimates of seed production, fruit consumption and bird movement patterns, in combination with a seed dispersal model and a graph-theoretical approach for network connectivity analysis. We found that for this plant-animal interaction, the hypothesis mentioned above is not supported. Functional connectivity decreased as the structural connectivity provided by corridors increased, and stepping stones were much more effective connectivity providers than corridors. Our findings are not generalizable to other situations because thrushes contribute to the dispersal of seeds along narrow and sinuous corridors, which provide unsuitable conditions for the establishment of lingues. We conclude that (a) the effectiveness of corridors for promoting connectivity and successful dispersal is landscape- and species-specific; and that (b) effective conservation of Chilean forest biodiversity involves a tradeoff between enhancing the availability of stepping stones and providing corridors of sufficient width and appropriate shape to meet the needs and dispersal modalities of different species.
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References
Amico GC, Aizen MA (2005) Dispersión de semillas por aves en un bosque templado de Sudamérica austral: ¿quién dispersa a quién? Ecología Austral 15:89–100
Anderson GS, Danielson BJ (1997) The effects of landscape composition and physiognomy on metapopulation size: the role of corridors. Landscape Ecol 12:261–271
Armesto JJ, Villagrán C, Donoso C (1994) Desde la era glacial a la industrial: la historia del bosque templado chileno. Ambient y Desarro 10:66–72
Awade M, Boscolo D, Metzger JP (2012) Using binary and probabilistic habitat availability indices derived from graph theory to model bird occurrence in fragmented forests. Landscape Ecol 27:185–198
Baum KA, Haynes KJ, Dillemuth FP, Cronin JT (2004) The matrix enhances the effectiveness of corridors and stepping stones. Ecology 85:2671–2676
Beier P, Noss RF (1998) Do habitat corridors provide connectivity? Conserv Biol 12:1241–1252
Cain ML, Milligan BG, Strand AE (2000) Long-distance seed dispersal in plant populations. Am J Bot 87:1217–1227
Chetkiewicz CLB, St Clair CC, Boyce MS (2006) Corridors for conservation: integrating pattern and process. Annu Rev Ecol Evol Syst 37:317–342
Damschen EI, Haddad NM, Orrock JL, Tewksbury JJ, Levey DJ (2006) Corridors increase plant species richness at large scales. Science 313:1284–1286
Davies ZG, Pullin AS (2007) Are hedgerows effective corridors between fragments of woodland habitat? An evidence-based approach. Landscape Ecol 22:333–351
Dennis RLH, Dapporto L, Dover JW, Shreeve TG (2013) Corridors and barriers in biodiversity conservation: a novel resource-based habitat perspective for butterflies. Biodivers Conserv 22:2709–2734
Donoso C (1993) Bosques templados de Chile y Argentina. Variación, estructura y dinámica. Editorial Universitaria, Santiago
Echeverría C, Newton A, Nahuelhual L, Coomes D, Rey-Benayas JM (2012) How landscapes change: integration of spatial patterns and human processes in temperate landscapes of southern Chile. Appl Geogr 32:822–831
Evans DM, Levey DJ, Tewskbury JJ (2013) Landscape corridors promote long-distance seed-dispersal by birds during winter but not during summer at an experimentally fragmented restoration site. Ecol Restor 31:23–30
Forman RTT (1995) Some general principles of landscape and regional ecology. Landscape Ecol 10:133–142
Forman RTT, Godron M (1986) Landscape Ecology. Wiley, New York
Gho D (2010) Consumo de frutos de Persea lingue (Lauraceae) en el valle central del sur de Chile. Undergraduate Thesis, Universidad Austral de Chile, Valdivia
Gilbert-Norton L, Wilson R, Stevens JR, Beard KH (2010) A meta-analytic review of corridor effectiveness. Conserv Biol 24:660–668
Haddad NM, Bowne DR, Cunningham A, Danielson BJ, Levey DJ, Sargent S, Spira T (2003) Corridor use by diverse taxa. Ecology 84:609–615
Hudgens BR, Haddad NM (2003) Predicting which species will benefit from corridors in fragmented landscapes from population growth models. Am Nat 161:808–820
Laurance SGW (2004) Responses of understory rain forest birds to road edges in central Amazonia. Ecol Appl 14:1344–1357
Levey DJ, Bolker BM, Tewksbury JJ, Sargent S, Haddad NM (2005) Effects of landscape corridors on seed dispersal by birds. Science 309:146–148
Levey DJ, Tewksbury JJ, Bolker BM (2008) Modelling long-distance seed dispersal in heterogeneous landscapes. J Ecol 96:599–608
Levin SA, Muller-Landau HC, Nathan R, Chave J (2003) The ecology and evolution of seed dispersal: a theoretical perspective. Annu Rev Ecol Evol S 34:575–604
Minor ES, Tessel SM, Engelhardt KAM, Lookingbill TR (2009) The role of landscape connectivity in assembling exotic plant communities: a network analysis. Ecology 90:1802–1809
Moore JE, Swihart RK (2007) Importance of fragmentation-tolerant species as seed dispersers in disturbed landscapes. Oecologia 151:663–674
Mueller T, Lenz J, Caprano T, Fiedler W, Böhning-Gaese K (2014) Large frugivorous birds facilitate functional connectivity of fragmented landscapes. J Appl Ecol. doi:10.1111/1365-2664.12247
Ockinger E, Smith HG (2008) Do corridors promote dispersal in grassland butterflies and other insects? Landscape Ecol 23:27–40
Orellana JI, Smith-Ramírez C, Rau J, Sade S, Gantz A (2011) Sincronía en la abundancia estacional de Turdusfalcklandii (Muscicapidae: Turdidae). X CongresoChileno de Ornitología, Santiago
R Development Core Team (2014) R: a language and environment for statistical computing. R Foundation for Statistical Computing, Vienna
Rubio L, Saura S (2012) Assessing the importance of individual habitat patches as irreplaceable connectivity providers: and analysis of simulated and real landscape data. Ecol Complex 11:28–37
Saura S, Rubio L (2010) A common currency for the different ways in which patches and links can contribute to habitat availability and connectivity in the landscape. Ecography 33:523–537
Saura S, Torné J (2009) ConeforSensinode 2.2: A software package for quantifying the importance of habitat patches for landscape connectivity. Environ Modell Softw 24:135–139
Schippers P, Grashof-Bokdam CJ, Verboom J, Baveco JM, Jochem R, Meeuwsen HAM, Van Adrichem MHC (2009) Sacrificing patches for linear habitat elements enhances metapopulation performance of woodland birds in fragmented landscapes. Landscape Ecol 24:1123–1133
Segurado P, Branco P, Ferreira MT (2013) Prioritizing restoration of structural connectivity in rivers: a graph based approach. Landscape Ecol 28:1231–1238
Sieving KE, Willson MF, De Santo TL (2000) Defining corridor functions for endemic birds in fragmented south-temperate rainforest. Conserv Biol 14:1120–1132
Smith-Ramirez C, Celis-Diez JL, von Jenstchyk E, Jiménez JE, Armesto JJ (2010) Habitat use of remnant forest habitats by the threatened arboreal marsupial Dromiciops gliroides (Microbiotheria) in a rural landscape of southern Chile. Wildl Res 37:249–254
Tang Q, Liang G, Lu X, Ding S (2014) Effects of corridor networks on plant species composition and diversity in an intensive agriculture landscape. Chin Geogr Sci 24:93–103
Taylor PD, Fahrig L, Henein K, Merriam G (1993) Connectivity is a vital element of landscape structure. Oikos 68:571–573
Tewksbury JJ, Levey DJ, Haddad NM, Sargent S, Orrock JL, Weldon A, Danielson BJ, Brinkerhoff J, Damschen EI, Townsend P (2002) Corridors affect plants, animals, and their interactions in fragmented landscapes. P Natl Acad Sci USA 99:12923–12926
Tremblay M, St Clair C (2009) Factors affecting the permeability of transportation and riparian corridors to the movements of songbirds in an urban landscape. J Appl Ecol 46:1314–1322
Vásquez I (2011) Patrones espaciales de reclutamiento y dispersión de semillas del árbol Persea lingue Ness en el bosque del valle del sur de Chile. Undergraduate Thesis, Universidad de Chile, Chile
Vergara PM (2011) Matrix-dependent corridor effectiveness and the abundance of forest birds in fragmented landscapes. Landscape Ecol 26:1085–1096
Vergara PM, Armesto JJ (2009) Responses of Chilean forest birds to anthropogenic habitat fragmentation across spatial scales. Landscape Ecol 24:25–38
Vergara PM, Smith C, Delpiano CA, Orellana I, Gho D, Vásquez I (2010) Frugivory on Persea lingue in temperate Chilean forest: interactions between fruit availability and habitat fragmentation across multiple spatial scales. Oecologia 164:981–991
Vergara PM, Pérez-Hernández CG, Hahn IJ, Jiménez JE (2013) Matrix composition and corridor function for Austral Thrushes in a fragmented temperate forest. Landscape Ecol 28:121–133
Wehling S, Diekmann M (2009) Importance of hedgerows as habitat corridors for forest plants in agricultural landscapes. Biol Conserv 142:2522–2530
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Fondecyt Grants (11080085 and 1131133) and GEFOUR Grant (AGL2012-31099) provided the funds for this study.
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Pérez-Hernández, C.G., Vergara, P.M., Saura, S. et al. Do corridors promote connectivity for bird-dispersed trees? The case of Persea lingue in Chilean fragmented landscapes. Landscape Ecol 30, 77–90 (2015). https://doi.org/10.1007/s10980-014-0111-2
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DOI: https://doi.org/10.1007/s10980-014-0111-2