scholarly journals Seedling survival responses to conspecific density, soil nutrients, and irradiance vary with age in a tropical forest

Ecology ◽  
2016 ◽  
Vol 97 (9) ◽  
pp. 2406-2415 ◽  
Author(s):  
Sydne Record ◽  
Richard K. Kobe ◽  
Corine F. Vriesendorp ◽  
Andrew O. Finley
Keyword(s):  
Tropical Forest ◽  
Soil Nutrients ◽  
Seedling Survival ◽  
Conspecific Density

scholarly journals Seedling survival declines with increasing conspecific density in a common temperate tree

Ecosphere ◽  
2020 ◽  
Vol 11 (11) ◽  
Author(s):  
Fiona V. Jevon ◽  
Sydne Record ◽  
John Grady ◽  
Ashley K. Lang ◽  
David A. Orwig ◽  
...  
Keyword(s):  
Seedling Survival ◽  
Conspecific Density

Tropical forest dynamics in unstable terrain: a case study from New Guinea

2018 ◽  
Vol 34 (3) ◽  
pp. 157-175 ◽  
Author(s):  
John B. Vincent ◽  
Benjamin L. Turner ◽  
Clant Alok ◽  
Vojtech Novotny ◽  
George D. Weiblen ◽  
...  
Keyword(s):  
Tropical Forest ◽  
Soil Nutrients ◽  
Forest Dynamics ◽  
Subduction Zones ◽  
Tree Mortality ◽  
Small Diameter ◽  
Natural Disturbance ◽  
New Guinea ◽  
North Coast ◽  
Tropical Forest Dynamics

Abstract:Long-term forest dynamics plots in the tropics tend to be situated on stable terrain. This study investigated forest dynamics on the north coast of New Guinea where active subduction zones are uplifting lowland basins and exposing relatively young sediments to rapid weathering. We examined forest dynamics in relation to disturbance history, topography and soil nutrients based on partial re-census of the 50-ha Wanang Forest Dynamics Plot in Papua New Guinea. The plot is relatively high in cations and phosphorus but low in nitrogen. Soil nutrients and topography accounted for 29% of variation in species composition but only 4% of variation in basal area. There were few areas of high biomass and most of the forest was comprised of small-diameter stems. Approximately 18% of the forest was less than 30 y old and the annual tree mortality rate of nearly 4% was higher than in other tropical forests in South-East Asia and the neotropics. These results support the reputation of New Guinea's forests as highly dynamic, with frequent natural disturbance. Empirical documentation of this hypothesis expands our understanding of tropical forest dynamics and suggests that geomorphology might be incorporated in models of global carbon storage especially in regions of unstable terrain.

scholarly journals Impacts of logging on density-dependent predation of dipterocarp seeds in a South East Asian rainforest

2011 ◽  
Vol 366 (1582) ◽  
pp. 3246-3255 ◽  
Author(s):  
Robert Bagchi ◽  
Christopher D. Philipson ◽  
Eleanor M. Slade ◽  
Andy Hector ◽  
Sam Phillips ◽  
...  
Keyword(s):  
East Asia ◽  
Large Scale ◽  
Species Coexistence ◽  
Seedling Survival ◽  
Spatial Scales ◽  
Small Scale ◽  
South East Asia ◽  
Similar Data ◽  
Neotropical Forests ◽  
Conspecific Density

Much of the forest remaining in South East Asia has been selectively logged. The processes promoting species coexistence may be the key to the recovery and maintenance of diversity in these forests. One such process is the Janzen–Connell mechanism, where specialized natural enemies such as seed predators maintain diversity by inhibiting regeneration near conspecifics. In Neotropical forests, anthropogenic disturbance can disrupt the Janzen–Connell mechanism, but similar data are unavailable for South East Asia. We investigated the effects of conspecific density (two spatial scales) and distance from fruiting trees on seed and seedling survival of the canopy tree Parashorea malaanonan in unlogged and logged forests in Sabah, Malaysia. The production of mature seeds was higher in unlogged forest, perhaps because high adult densities facilitate pollination or satiate pre-dispersal predators. In both forest types, post-dispersal survival was reduced by small-scale (1 m 2 ) conspecific density, but not by proximity to the nearest fruiting tree. Large-scale conspecific density (seeds per fruiting tree) reduced predation, probably by satiating predators. Higher seed production in unlogged forest, in combination with slightly higher survival, meant that recruitment was almost entirely limited to unlogged forest. Thus, while logging might not affect the Janzen–Connell mechanism at this site, it may influence the recruitment of particular species.

Overstory structure and soil nutrients effect on plant diversity in unmanaged moist tropical forest

2016 ◽  
Vol 75 ◽  
pp. 43-53 ◽  
Author(s):  
Mukesh Kumar Gautam ◽  
Rajesh Kumar Manhas ◽  
Ashutosh Kumar Tripathi
Keyword(s):  
Tropical Forest ◽  
Soil Nutrients ◽  
Plant Diversity

scholarly journals Abiotic and biotic drivers of seedling survival in a hurricane-impacted tropical forest

2009 ◽  
Vol 97 (6) ◽  
pp. 1346-1359 ◽  
Author(s):  
Liza S. Comita ◽  
Maria Uriarte ◽  
Jill Thompson ◽  
Inge Jonckheere ◽  
Charles D. Canham ◽  
...  
Keyword(s):  
Tropical Forest ◽  
Seedling Survival

scholarly journals Lack of negative density-dependence regulation in a dominant oak tree from a neotropical highland forest

2018 ◽  
Author(s):  
Irene Calderón-Sanou ◽  
Luis Diego Ríos ◽  
Alfredo Cascante-Marín ◽  
Gilbert Barrantes ◽  
Eric J. Fuchs
Keyword(s):  
Costa Rica ◽  
Density Dependence ◽  
Species Coexistence ◽  
Local Density ◽  
Seedling Survival ◽  
Forest Composition ◽  
Adult Density ◽  
Conspecific Density ◽  
Negative Density Dependence ◽  
Highland Forests

AbstractConspecific negative density-dependence(CNDD) is one of the main mechanisms proposed to regulate species coexistence. Tropical highland forests, in contrast to diverse lowland forests, are commonly dominated by a few tree species. Testing the importance of density-dependence effects on seedling establishment of dominant trees may provide insights on the mechanisms regulating population dynamics and forest composition of tropical highlands. We tested the importance of CNDD regulation on seedling survival and recruitment ofQuercus costaricensis, a monodominant oak in the Talamanca highland forests of Costa Rica. We used spatial statistics and generalized linear mixed models to test the effects of conspecific density, distance to the nearest adult, density ofChusqueabamboo shoots, and herbivory on the annual survival probability of 3538 seedlings between 2014 and 2017. We did not find any effect of CNDD on seedling survival. However, bamboo density and herbivory both significantly decreased seedling survival. All seedlings had signs of herbivory and predator satiation may explain the lack of density dependent regulation in this species. We argue that the lack of intraspecific density regulation at the seedling stage may explain the dominance ofQ. costaricensisin the highland forests of Costa Rica. Local density of this endemic oak is instead regulated by herbivory and the density ofChusquea.

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