Glyphosate effects on floristic composition and species diversity in the Flooding Pampa grassland (Argentina)

Rodríguez, A. M.; Jacobo, Elizabeth Juliana

doi:10.1016/j.agee.2010.05.003

Cited by 39 publications

(54 citation statements)

References 40 publications

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“…A well-developed cover of summer grasses may thus interfere with the germination of these exotic species (Oesterheld & Sala 1990;Deregibus et al 1994;Jacobo et al 2006). As a result, prescribed grazing pulses or herbicide applications that reduce grass biomass in late summer will often increase seedling recruitment by exotic winter species (see Rodríguez & Jacobo 2010). This interpretation is consistent with the notion that not only the intensity, but also the timing of disturbance influences invasion dynamics (Stachowicz & Tilman 2005;Wolkovich & Cleland 2010).…”

Section: F U N C T I O N a L G R O U P B I O M A S S A N D I D E N T supporting

confidence: 78%

“…Removing dominant summer grasses induced a rapid, yet transient increase in the subordinate group of exotic grasses. The already common exotic annual grasses (mainly L. multiflorum) were able to occupy vegetation gaps created by 2 years of summer-grass removals (Deregibus et al 1994;Rodríguez & Jacobo 2010). In contrast, exotic grasses failed to increase upon removal of native winter grasses, despite both groups having similar phenologies (Sala et al 1981;Perelman et al 2007).…”

Section: I F F E R E N T I a L R E S P O N S E S O F E X O T I C P mentioning

confidence: 99%

“…There is also a negative correlation between the local abundance of native summer grasses and that of exotic winter forbs (Perelman et al 2007). Thus, herbicides used to suppress summer grasses and to promote winter forage grasses often lead to increased exotic forb invasion (Rodríguez & Jacobo 2010). Further, poor management may alter whole life-forms (i.e.…”

Section: Introductionmentioning

confidence: 99%

“…Selective treatments involved removing single functional groups (NSG, NWG, EG, NF, EF) or whole life-forms (TG = total grasses and TF = total forbs). The former simulated drastic reductions in functional group biomass that can be induced by management actions such as seasonal grazing and herbicide application (Rusch & Oesterheld 1997;Chaneton et al 2002;Rodríguez & Jacobo 2010). Comparison of the whole life-form removals to the functional group removals allowed us to examine whether functional group losses exert additive effects on invasion, or interactive effects of a synergistic or subadditive form.…”

Section: E X P E R I M E N T a L D E S I G Nmentioning

confidence: 99%

“…Most naturalized exotics are short-lived winter species (Perelman et al 2007). Management often results in partial or total loss of native functional groups, with varied effects on exotic species success (Rusch & Oesterheld 1997;Chaneton et al 2002;Rodríguez & Jacobo 2010). Livestock grazing drastically reduces native cool-season graminoids, which are replaced by annual exotic grasses and low-growing forbs (Rusch & Oesterheld 1997;Jacobo et al 2006).…”

Section: Introductionmentioning

confidence: 99%

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Functional group dominance and identity effects influence the magnitude of grassland invasion

et al. 2013

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Summary 1.Variation in functional community composition is expected to influence the extent of exotic species invasions. Yet, whether resident functional groups control invasion through their relative biomass (mass ratio hypothesis) or by traits other than biomass (identity hypothesis) remains poorly understood. 2. We performed a 6-year experiment to determine the effects of removing different functional groups on exotic species biomass in a Flooding Pampa grassland, Argentina. Functional groups were defined by life-form (grasses or forbs), phenology (winter or summer) and origin (native or exotic). Removal of each functional group was compared against the removal of an equivalent amount of random biomass. Exotic group responses were monitored over 4 years of continuous removals, and after 2 years of recovery without manipulations. 3. Removal of dominant native summer grasses caused the greatest impact on exotic species and overall community composition. Native summer-grass removal significantly increased exotic grass (120%) and forb (730%) biomass beyond the level (46% and 180%, respectively) expected from deleting a similar amount of biomass at random. Exotic annual grasses showed only a transient increase, whereas exotic forb invasion persisted even after 2 years without removals. 4. Removing subordinate, native or exotic winter grasses, and rare native forbs significantly promoted exotic forbs, but to the same level (300%) as random biomass removals. Total grass removal increased exotic forbs to half the extent expected from adding the effects of single grass group removals. Dispersal limitation and harsh abiotic conditions may constrain exotic forb spread into such heavily grass-depleted patches. 5. Synthesis. The impact of losing a functional group on the magnitude and persistence of invasion reflected its relative contribution to community biomass. Identity attributes other than biomass (e.g. phenological niche) further enhanced the biotic control that dominant native grasses exerted on established exotic species. Our findings highlight the community legacies of past disturbances to dominant functional groups.

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Section: F U N C T I O N a L G R O U P B I O M A S S A N D I D E N T supporting

confidence: 78%

Section: I F F E R E N T I a L R E S P O N S E S O F E X O T I C P mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: E X P E R I M E N T a L D E S I G Nmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Functional group dominance and identity effects influence the magnitude of grassland invasion

et al. 2013

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Benchmark study on glyphosate‐resistant cropping systems in the United States. Part 7: Effects of weed management strategy (grower practices versus academic recommendations) on the weed soil seedbank over 6 years

Gibson

Young

Owen

et al. 2015

Pest Management Science

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Asexual Endophytes of Grasses: Invisible Symbionts, Visible Imprints in the Host Neighborhood

Omacini

2013

Advances in Endophytic Research

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Glyphosate effects on floristic composition and species diversity in the Flooding Pampa grassland (Argentina)

Cited by 39 publications

References 40 publications

Functional group dominance and identity effects influence the magnitude of grassland invasion

Functional group dominance and identity effects influence the magnitude of grassland invasion

Benchmark study on glyphosate‐resistant cropping systems in the United States. Part 7: Effects of weed management strategy (grower practices versus academic recommendations) on the weed soil seedbank over 6 years

Asexual Endophytes of Grasses: Invisible Symbionts, Visible Imprints in the Host Neighborhood

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