The shape of things to come: woodland herb niche contraction begins during recruitment in mesic forest microhabitat

Warren, Robert J.; Bradford, Mark A.

doi:10.1098/rspb.2010.1886

Cited by 39 publications

(39 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our relative recruitment intensities indicate that the regeneration niche can look different from those of adults even when observed at the regional scale. Transplant experiments also suggest that adult abundance might provide a poor indication of the niche requirements, and cast doubt upon SDMs based solely on adult distribution data (Warren & Bradford, ). Among the factors that can produce these life history differences are strong interactions between climate and competition, which differs for seedlings and adult trees.…”

Section: Discussionmentioning

confidence: 99%

Dual impacts of climate change: forest migration and turnover through life history

Zhu

Woodall

Ghosh

et al. 2013

Global Change Biology

103

View full text Add to dashboard Cite

Tree species are predicted to track future climate by shifting their geographic distributions, but climate-mediated migrations are not apparent in a recent continental-scale analysis. To better understand the mechanisms of a possible migration lag, we analyzed relative recruitment patterns by comparing juvenile and adult tree abundances in climate space. One would expect relative recruitment to be higher in cold and dry climates as a result of tree migration with juveniles located further poleward than adults. Alternatively, relative recruitment could be higher in warm and wet climates as a result of higher tree population turnover with increased temperature and precipitation. Using the USDA Forest Service's Forest Inventory and Analysis data at regional scales, we jointly modeled juvenile and adult abundance distributions for 65 tree species in climate space of the eastern United States. We directly compared the optimal climate conditions for juveniles and adults, identified the climates where each species has high relative recruitment, and synthesized relative recruitment patterns across species. Results suggest that for 77% and 83% of the tree species, juveniles have higher optimal temperature and optimal precipitation, respectively, than adults. Across species, the relative recruitment pattern is dominated by relatively more abundant juveniles than adults in warm and wet climates. These different abundance-climate responses through life history are consistent with faster population turnover and inconsistent with the geographic trend of large-scale tree migration. Taken together, this juvenile-adult analysis suggests that tree species might respond to climate change by having faster turnover as dynamics accelerate with longer growing seasons and higher temperatures, before there is evidence of poleward migration at biogeographic scales.

show abstract

Section: Discussionmentioning

confidence: 99%

Dual impacts of climate change: forest migration and turnover through life history

Zhu

Woodall

Ghosh

et al. 2013

Global Change Biology

103

View full text Add to dashboard Cite

show abstract

“…The seed has a relatively large appendage called an elaiosome that attracts foraging ants and induces them to retrieve the seed back to their nest ). It does not have clonal reproduction and is long-lived (Warren II 2007;Warren II and Bradford 2011).…”

Section: Study Speciesmentioning

confidence: 99%

Forest invader replaces predation but not dispersal services by a keystone species

et al. 2015

Self Cite

View full text Add to dashboard Cite

Invasive species generally occur and thrive in human-disturbed ecosystems, but Brachyponera chinensis (Asian needle ant, formerly 'Pachycondyla chinensis') also invades intact forests. The invasion into native habitats potentially puts B. chinensis in direct competition with the keystone seed-dispersing ants in the genus Aphaenogaster. We observed B. chinensis colonizing artificial nests placed in deciduous forest of the north Georgia Piedmont (US). Their presence appeared to displace existing Aphaenogaster rudis and Reticulitermes flavipes (subterranean termite) colonies. We subsequently mapped the B. chinensis invasion as well as co-existing A. rudis and R. flavipes colonies by examining coarse woody material (CWM) for nesting colonies. We tested whether the B. chinensis invasion changed with forest microclimates, covaried with A. rudis and/or R. flavipes occurrence, and whether it was associated with failed dispersal of a dominant understory herb. Our results and observations suggest that B. chinensis shares ecological niche requirements (temperature, moisture and CWM as nesting habitat) with A. rudis, severely diminishing the abundance of this native ant. In supplanting A. rudis, B. chinensis appears to play an equivalent role to A. rudis as a termite predator, but fails as a seed disperser. Essentially, the invader substitutes for the negative but not the positive species interactions, thereby apparently shifting ecological dynamics in the invaded system.

show abstract

“…The understory measurements were taken with an LI-191 line quantum sensor and the open reference measurements were taken with an LI-200 spherical PAR sensor and logged with a LI-1400 datalogger (LI-COR Inc., Lincoln, Nebraska, USA). Measures were taken between 10 am and 2 pm on cloudy days, and a single, annual estimate of diffuse light taken in this manner is robust for making comparisons of understory light across space (Warren and Bradford 2011).…”

Section: Methodsmentioning

confidence: 99%

Habitat, dispersal and propagule pressure control exotic plant infilling within an invaded range

et al. 2013

Self Cite

View full text Add to dashboard Cite

Abstract. Deep in the heart of a longstanding invasion, an exotic grass is still invading. Range infilling potentially has the greatest impact on native communities and ecosystem processes, but receives much less attention than range expansion. 'Snapshot' studies of invasive plant dispersal, habitat and propagule limitations cannot determine whether a landscape is saturated or whether a species is actively infilling empty patches. We investigate the mechanisms underlying invasive plant infilling by tracking the localized movement and expansion of Microstegium vimineum populations from 2009 to 2011 at sites along a 100-km regional gradient in eastern U.S. deciduous forests. We find that infilling proceeds most rapidly where the invasive plants occur in warm, moist habitats adjacent to roads: under these conditions they produce copious seed, the dispersal distances of which increase exponentially with proximity to roadway. Invasion then appears limited where conditions are generally dry and cool as propagule pressure tapers off. Invasion also is limited in habitats .1 m from road corridors, where dispersal distances decline precipitously. In contrast to propagule and dispersal limitations, we find little evidence that infilling is habitat limited, meaning that as long as M. vimineum seeds are available and transported, the plant generally invades quite vigorously. Our results suggest an invasive species continues to spread, in a stratified manner, within the invaded landscape long after first arriving. These dynamics conflict with traditional invasion models that emphasize an invasive edge with distinct boundaries. We find that propagule pressure and dispersal regulate infilling, providing the basis for projecting spread and landscape coverage, ecological effects and the efficacy of containment strategies.

show abstract

The shape of things to come: woodland herb niche contraction begins during recruitment in mesic forest microhabitat

Cited by 39 publications

References 55 publications

Dual impacts of climate change: forest migration and turnover through life history

Dual impacts of climate change: forest migration and turnover through life history

Forest invader replaces predation but not dispersal services by a keystone species

Habitat, dispersal and propagule pressure control exotic plant infilling within an invaded range

Contact Info

Product

Resources

About