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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Detalles Bibliográficos
Autor principal: Rolhauser, Andrés Guillermo
Otros Autores: Chaneton, Enrique José, Batista, William Bennett
Formato: Artículo
Lenguaje:Inglés
Materias:
APPARENT COMPETITION
ESCAPE HYPOTHESIS
FACILITATION
FOREST EXPANSION
INVASION
ADULT
BURROWING
CONSPECIFIC
ENVIRONMENTAL DISTURBANCE
ESCAPE BEHAVIOR
FOREST FIRE
HUMID ENVIRONMENT
INVASIVE SPECIES
MONOCOTYLEDON
RIPARIAN FOREST
SAVANNA
SEEDLING ESTABLISHMENT
SURVIVAL
TRAMPLING
ARECACEAE
ARGENTINA
ECOSYSTEM
EUPHORBIACEAE
GEOGRAPHY
PHYSIOLOGY
RIVER
SAPINDACEAE
SEED DISPERSAL
SEEDLING
SPECIES DIFFERENCE
TREE
RIVERS
SPECIES SPECIFICITY
TREES
ALLOPHYLUS
ALLOPHYLUS EDULIS
ANIMALIA
AVES
BUTIA YATAY
SEBASTIANIA
SEBASTIANIA COMMERSONIANA
Acceso en línea:http://ri.agro.uba.ar/files/intranet/articulo/2011Rolhauser.pdf
LINK AL EDITOR
Aporte de:Registro referencial: Solicitar el recurso aquí
Biblioteca Central (FAUBA) de Universidad de Buenos Aires
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245 0 0 |a Influence of conspecific and heterospecific adults on riparian tree species establishment during encroachment of a humid palm savanna 
520 |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. 
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700 1 |9 6467  |a Chaneton, Enrique José 
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773 |t Oecologia  |g Vol.167, no.1 (2011), p.141-148 
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900 |a ^aRolhauser^bA.G.^tIFEVA, CONICET and Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453, C1417DSE Buenos Aires, Argentina 
900 |a ^aChaneton^bE.J.^tCátedra de Métodos Cuantitativos Aplicados, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453, C1417DSE Buenos Aires, Argentina 
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900 |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. 
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