The effect of predation on the structure and invasibility of assembled communities

Robinson, James V.; Edgemon, Michael A.

doi:10.1007/bf00388471

Cited by 14 publications

(6 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…McPeek 1998). For example, Robinson & Edgemon (1989) found a very different effect of predation on algal communities in a microcosm experiment similar to the present study. Their predator had a low impact on individual populations and promoted species richness by enhancing dispersal effect.…”

Section: Discussionsupporting

confidence: 87%

Dispersal, spatial scale, and species diversity in a hierarchically structured experimental landscape

Cadotte¹,

2005

View full text Add to dashboard Cite

Although there has been growing interest in the effect of dispersal on species diversity, much remains unknown about how dispersal occurring at multiple scales influences diversity. We used an experimental microbial landscape to determine whether dispersal occurring at two different scales - among local communities and among metacommunities - affects diversity differently. At the local scale, dispersal initially had a positive effect and subsequently a neutral effect on diversity, whereas at the metacommunity and landscape scales, dispersal showed a consistently negative effect. The timing in which dispersal affected beta diversity also differed sharply between local communities and metacommunities. These patterns were explained by scale- and time-dependent effects of dispersal in allowing spread of species and in removing spatial refuges from predators. Our results suggest that the relative contribution of opposing mechanisms by which dispersal affects diversity changes considerably over time and space in hierarchical landscapes in which dispersal occurs at multiple scales.

show abstract

Section: Discussionsupporting

confidence: 87%

Dispersal, spatial scale, and species diversity in a hierarchically structured experimental landscape

Cadotte¹,

2005

View full text Add to dashboard Cite

show abstract

“…Well-illuminated sites resulting from human or natural disturbance have been implicated in exotic plant species invasions (Elton, 1958;Mack, 1986;Crawley, 1987;Robinson and Edgemon, 1988;Hobbs, 1989;Rejmanek, 1989;Burke and Grime, 1996;Lozon and MacIsaac, 1997), post-glacial tree migrations in North America (Davis, 1987), and may similarly promote migration among fragments. Such sites may be particularly important in productive, lightlimited communities such as mesic temperate deciduous forests.…”

Section: Introductionmentioning

confidence: 98%

Factors influencing tree colonization in fragmented forests: an experimental study of introduced seeds and seedlings

Hewitt

Kellman

2004

Forest Ecology and Management

View full text Add to dashboard Cite

“…Further understanding of the invasion process has been gained by considering the interactions of species and communities (Orians 1986;Lodge 1993). Much of the research used to develop invasion theory relies on microcosm experiments (Robinson & Edgemon 1989;Drake 1991;McGrady-Steed et al 1997), small manipulated field plots (G. R. Robinson et al 1995;Burke & Grime 1996;Tilman 1997), or field surveys (Chaloupka & Domm 1986;DeFerrari & Naiman 1994;Matlack 1994). Although these experiments have provided critical information on community invasibility, the treatment of communities without a spatial context has limited the applicability of this research to the conservation and management of native communities.…”

Section: Introductionmentioning

confidence: 99%

Effect of Edge Structure on the Flux of Species into Forest Interiors

Cadenasso

Pickett

2001

Conservation Biology

201

123

View full text Add to dashboard Cite

A key goal of conservation biology is to prevent the spread of exotic species. Previous work on exotic invasion has two limitations: (1) the lack of a spatially explicit approach and (2) a primary focus on the net effect of invasion by examining invasive species already present in the community. We address these limitations by focusing on the arrival of a potential invader into a community and use a spatially explicit approach to quantify the flow of seeds from the surrounding landscape into the interior of a forest. We hypothesize that the structure of forest-edge vegetation influences how the edge mediates seed flux. To test our hypothesis, we experimentally altered vegetation structure within 20 m of the edge to create two edge treatments: thinned and intact. We quantified the flux of seeds moving into the forest interior across the two treatments. We used seed traps randomly arrayed on transects from 5 to 50 m into the forest. More seeds crossed the thinned treatment than crossed the intact treatment to reach the forest interior. In addition, seeds that crossed the thinned treatment dispersed farther into the forest than those that crossed the intact treatment. These results were consistent throughout the period of maximum autumn dispersal, including periods before and after leaf drop. Our results show that the structure of vegetation on the edge interacts with the flux of wind-dispersed seed across the edge. We demonstrated that an edge with intact vegetation can function as a physical barrier to seed dispersal. Therefore, the structure of vegetation on edges can influence the function of edges as barriers to seed flux into the forest interior. Efecto de la Estructura de Bordes en el Flujo de Especies Hacia el Interior de BosquesResumen: Una preocupación clave para la conservación biológica es la prevención de la dispersión de especies exóticas. Los trabajos anteriores sobre invasiones tienen dos limitaciones: (1) la carencia de una metodología espacialmente explícita y (2) un enfoque principal en el efecto neto de la invasión al examinar especies invasoras ya presentes en la comunidad. Nosotros enfrentamos estas limitaciones enfocándonos en el arribo de un invasor potencial a la comunidad y usamos una metodología espacialmente explícita para cuantificar el flujo de semillas del paisaje circundante hacia el interior de un bosque. Hipotetizamos que la estructura de la vegetación del borde del bosque influye sobre la forma en que el borde se interpone al flujo de semillas. Para probar nuestra hipótesis, alteramos experimentalmente la estructura de la vegetación dentro de 20 m del borde para crear dos tratamientos; borde adelgazado y borde intacto. Cuantificamos el flujo de semillas moviéndose hacia el interior del bosque a lo largo de los dos tratamientos. Utilizamos trampas de semillas colocadas aleatoriamente en transectos de 5-50 m hacia adentro del bosque. Un número mayor de semillas cruzó el tratamiento adelgazado que el tratamiento intacto llegando al interior del bosque. Aunado a esto, las semillas que ...

show abstract

The effect of predation on the structure and invasibility of assembled communities

Cited by 14 publications

References 23 publications

Dispersal, spatial scale, and species diversity in a hierarchically structured experimental landscape

Dispersal, spatial scale, and species diversity in a hierarchically structured experimental landscape

Factors influencing tree colonization in fragmented forests: an experimental study of introduced seeds and seedlings

Effect of Edge Structure on the Flux of Species into Forest Interiors

Contact Info

Product

Resources

About