Influence of conspecific and heterospecific adults on riparian tree species establishment during encroachment of a humid palm savanna

Woody plant encroachment of savanna ecosystems has been related to altered disturbance regimes, mainly fire suppression and herbivore exclusion. In contrast, neighbourhood interactions among resident and colonising woody species have received little attention, despite their likely influence on the p...

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Autor principal: Rolhauser, A.G
Otros Autores: Chaneton, E.J, Batista, W.B
Formato: Capítulo de libro
Lenguaje:Inglés
Publicado: 2011
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100 1 |a Rolhauser, A.G. 
245 1 0 |a Influence of conspecific and heterospecific adults on riparian tree species establishment during encroachment of a humid palm savanna 
260 |c 2011 
270 1 0 |m Rolhauser, A. G.; Departamento de Biología, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de San Juan, Av. Ignacio de la Roza 590 (O), Rivadavia, J5402DCS San Juan, Argentina; email: arolhauser@unsj-cuim.edu.ar 
506 |2 openaire  |e Política editorial 
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520 3 |a Woody plant encroachment of savanna ecosystems has been related to altered disturbance regimes, mainly fire suppression and herbivore exclusion. In contrast, neighbourhood interactions among resident and colonising woody species have received little attention, despite their likely influence on the pattern and rate of tree establishment. We examined how resident palm trees (Butia yatay) and established adults of two riparian forest tree species (Allophylus edulis and Sebastiania commersoniana) influenced seed arrival and seedling performance of the latter two species in a humid savanna of east-central Argentina. Seed traps and seedlings of both riparian species were placed in herbaceous openings, and beneath palm, conspecific and heterospecific adult trees in two unburned savanna patches, and were monitored for 2 years. Only seeds of the bird-dispersed Allophylus arrived in palm microsites, yet survival of Allophylus seedlings near adult palms was limited by animal damage through trampling and burrowing, a non-trophic mechanism of apparent competition. Seeds of both riparian species dispersed into conspecific microsites, although adult trees selectively reduced growth of conspecific seedlings, a pattern consistent with the "escape hypothesis". Further, survival of Sebastiania increased in the moister Allophylus microsites, suggesting a one-way facilitative interaction between woody colonisers. Our results indicate that dispersal facilitation by resident savanna trees may be critical to riparian species invasion after fire suppression. Distance-dependent effects of conspecific and heterospecific adult trees could contribute to shape the subsequent dynamics of woody seedling establishment. Overall, we show that indirect interactions can play a prominent role in savanna encroachment by non-resident woody species. © 2011 Springer-Verlag.  |l eng 
593 |a IFEVA, CONICET and Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453, C1417DSE Buenos Aires, Argentina 
593 |a Cátedra de Métodos Cuantitativos Aplicados, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453, C1417DSE Buenos Aires, Argentina 
593 |a Departamento de Biología, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de San Juan, Av. Ignacio de la Roza 590 (O), Rivadavia, J5402DCS San Juan, Argentina 
690 1 0 |a APPARENT COMPETITION 
690 1 0 |a ESCAPE HYPOTHESIS 
690 1 0 |a FACILITATION 
690 1 0 |a FOREST EXPANSION 
690 1 0 |a INVASION 
690 1 0 |a ADULT 
690 1 0 |a APPARENT COMPETITION 
690 1 0 |a BURROWING 
690 1 0 |a CONSPECIFIC 
690 1 0 |a ENVIRONMENTAL DISTURBANCE 
690 1 0 |a ESCAPE BEHAVIOR 
690 1 0 |a FACILITATION 
690 1 0 |a FOREST FIRE 
690 1 0 |a HUMID ENVIRONMENT 
690 1 0 |a INVASIVE SPECIES 
690 1 0 |a MONOCOTYLEDON 
690 1 0 |a RIPARIAN FOREST 
690 1 0 |a SAVANNA 
690 1 0 |a SEEDLING ESTABLISHMENT 
690 1 0 |a SURVIVAL 
690 1 0 |a TRAMPLING 
690 1 0 |a ARECACEAE 
690 1 0 |a ARTICLE 
690 1 0 |a ECOSYSTEM 
690 1 0 |a EUPHORBIACEAE 
690 1 0 |a GEOGRAPHY 
690 1 0 |a PHYSIOLOGY 
690 1 0 |a RIVER 
690 1 0 |a SAPINDACEAE 
690 1 0 |a SEED DISPERSAL 
690 1 0 |a SEEDLING 
690 1 0 |a SPECIES DIFFERENCE 
690 1 0 |a TREE 
690 1 0 |a ARECACEAE 
690 1 0 |a ECOSYSTEM 
690 1 0 |a EUPHORBIACEAE 
690 1 0 |a GEOGRAPHY 
690 1 0 |a RIVERS 
690 1 0 |a SAPINDACEAE 
690 1 0 |a SEED DISPERSAL 
690 1 0 |a SEEDLING 
690 1 0 |a SPECIES SPECIFICITY 
690 1 0 |a TREES 
690 1 0 |a ALLOPHYLUS 
690 1 0 |a ALLOPHYLUS EDULIS 
690 1 0 |a ANIMALIA 
690 1 0 |a BUTIA YATAY 
690 1 0 |a SEBASTIANIA 
690 1 0 |a SEBASTIANIA COMMERSONIANA 
651 4 |a ARGENTINA 
651 4 |a ARGENTINA 
650 1 7 |2 spines  |a AVES 
700 1 |a Chaneton, E.J. 
700 1 |a Batista, W.B. 
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