Comparison of statistical tests for habitat associations in tropical forests: A case study of sympatric dipterocarp trees in a Bornean forest

Itoh, Akira; Ohkubo, Tadayasu; Nanami, Satoshi; Tan, Sylvester; Yamakura, Takuo

doi:10.1016/j.foreco.2009.10.022

Cited by 28 publications

(36 citation statements)

References 24 publications

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“…As an index of habitat niche breadth, we used the standard deviation (SD) of habitat functions of the study species, P(E|x), along the elevation gradient reported by Itoh et al (2010). A positive correlation was expected between mean clump size and inverse wing-loading or habitat niche breadth if seed dispersal or habitat niche breadth, respectively, was important.…”

Section: Methodsmentioning

confidence: 99%

“…As an index of habitat niche breadth, we used the standard deviation (SD) of habitat functions of the study species, P(E|x), along the elevation gradient reported by Itoh et al (2010). All the study species except S. parvifolia had statistically smaller SD values, indicating that they were all habitat specialists along elevation in the study plot (Itoh et al 2010). Higher elevation sites were mostly on sandy ridges having lower soil nutrients, while lower elevation sites in clay-rich valleys with higher soil nutrients.…”

Section: Methodsmentioning

confidence: 99%

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Fine‐scale Spatial Genetic Structure of Ten Dipterocarp Tree Species in a Bornean Rain Forest

et al. 2011

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Fine-scale spatial genetic structure is increasingly recognized as an important factor in the studies of tropical forest trees as it influences genetic diversity of local populations. The biologic mechanisms that generate fine-scale spatial genetic structure are not fully understood. We studied fine-scale spatial genetic structure in ten coexisting dipterocarp tree species in a Bornean rain forest using microsatellite markers. Six of the ten species showed statistically significant fine-scale spatial genetic structure. Fine-scale spatial genetic structure was stronger at smaller spatial scales ( 100 m) than at larger spatial scales (> 100 m) for each species. Multiple regression analysis suggested that seed dispersal distance was important at the smaller spatial scale. At the larger scale (> 100 m) and over the entire sample range (0-1000 m), pollinators and spatial distribution of adult trees were more important determinants of fine-scale spatial genetic structure. Fine-scale spatial genetic structure was stronger in species pollinated by less mobile small beetles than in species pollinated by the more mobile giant honeybee (Apis dorsata). It was also stronger in species where adult tree distributions were more clumped. The hypothesized mechanisms underlying the negative correlation between clump size and fine-scale spatial genetic structure were a large overlap among seed shadows and genetic drift within clumped species.

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Section: Methodsmentioning

confidence: 99%

“…As an index of habitat niche breadth, we used the standard deviation (SD) of habitat functions of the study species, P(E|x), along the elevation gradient reported by Itoh et al (2010). All the study species except S. parvifolia had statistically smaller SD values, indicating that they were all habitat specialists along elevation in the study plot (Itoh et al 2010). Higher elevation sites were mostly on sandy ridges having lower soil nutrients, while lower elevation sites in clay-rich valleys with higher soil nutrients.…”

Section: Methodsmentioning

confidence: 99%

Fine‐scale Spatial Genetic Structure of Ten Dipterocarp Tree Species in a Bornean Rain Forest

et al. 2011

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“…First, the soil conditions were categorised in most cases on the basis of apparent topography or soil classification types (Gunatilleke et al 2006;Comita et al 2007;Chuyong et al 2011;de Toledo et al 2011;Metz 2012); however, soil conditions vary continuously rather than discretely in a spatial context (Baldeck et al 2013). Thus, simplifying soil conditions by categorisation would reduce information related to soil environmental variation, and this may lower the robustness of any statistical analysis (Itoh et al 2010). Second, analyses of tree distributions have often used inventory data from the wellestablished stages.…”

Section: Introductionmentioning

confidence: 99%

Heterogeneity in soil water and light environments and dispersal limitation: what facilitates tree species coexistence in a temperate forest?

2014

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In the present study, we analysed the habitat association of tree species in an old-growth temperate forest across all life stages to test theories on the coexistence of tree species in forest communities. An inventory for trees was implemented at a 6-ha plot in Ogawa Forest Reserve for adults, juveniles, saplings and seedlings. Volumetric soil water content (SMC) and light levels were measured in 10-m grids. Relationships between the actual number of stems and environmental variables were determined for 35 major tree species, and the spatial correlations within and among species were analysed. The light level had no statistically significant effect on distribution of saplings and seedlings of any species. In contrast, most species had specific optimal values along the SMC gradient. The optimal values were almost identical in earlier life stages, but were more variable in later life stages among species. However, no effective niche partitioning among the species was apparent even at the adult stage. Furthermore, results of spatial analyses suggest that dispersal limitation was not sufficient to mitigate competition between species. This might result from well-scattered seed distribution via wind and bird dispersal, as well as conspecific density-dependent mortality of seeds and seedlings. Thus, both niche partitioning and dispersal limitation appeared less important for facilitating coexistence of species within this forest than expected in tropical forests. The tree species assembly in this temperate forest might be controlled through a neutral process at the spatial scale tested in this study.

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“…The majority of tree species at Lambir are habitat specialists with regard to topography and soil (Itoh et al 2003(Itoh et al , 2010Davies et al 2005;Russo et al 2005), but individuals nevertheless occur outside their habitats. The majority of tree species at Lambir are habitat specialists with regard to topography and soil (Itoh et al 2003(Itoh et al , 2010Davies et al 2005;Russo et al 2005), but individuals nevertheless occur outside their habitats.…”

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The Effect of Habitat Association and Edaphic Conditions on Tree Mortality during El Niño‐induced Drought in a Bornean Dipterocarp Forest

et al. 2012

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The effects of El Niño-induced droughts on dipterocarp forests must be quantified to evaluate the implications of future global climatic changes for the tropical forests of Southeast Asia. We studied the mortality of trees ! 1 cm in diameter in a lowland dipterocarp forest in Borneo before, during, and after the 1997/1998 El Niño drought. The annual mortality rates were 1.30, 1.75, and 1.66 percent/yr for the pre-drought, drought, and post-drought periods, respectively. The effect of drought was tree size-dependent being greater for larger trees. Modified logistic regression analysis revealed a significant interaction effect between species' habitat association and edaphic condition on mortality rates in all periods. For species associated with wet habitat, drought effect was greater in dry conditions than in wet conditions, in both the drought and post-drought periods. The mortality rates of dry-habitat species were less affected by the drought both in dry and wet conditions. A similar pattern was also found in common Dipterocarpaceae species; mortality rates increased more in species associated with wet-habitat in the drought and post-drought periods. Species and families with higher mortality in the pre-drought period tended to experience greater mortality increases during the drought and post-drought periods. These results suggest that changes in drought regimes alter the species composition and spatial distribution of dipterocarp forests.

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Comparison of statistical tests for habitat associations in tropical forests: A case study of sympatric dipterocarp trees in a Bornean forest

Cited by 28 publications

References 24 publications

Fine‐scale Spatial Genetic Structure of Ten Dipterocarp Tree Species in a Bornean Rain Forest

Fine‐scale Spatial Genetic Structure of Ten Dipterocarp Tree Species in a Bornean Rain Forest

Heterogeneity in soil water and light environments and dispersal limitation: what facilitates tree species coexistence in a temperate forest?

The Effect of Habitat Association and Edaphic Conditions on Tree Mortality during El Niño‐induced Drought in a Bornean Dipterocarp Forest

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