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Individual species-area relationship of woody plant communities in a heterogeneous subtropical monsoon rainforest.

Tsai CH, Lin YC, Wiegand T, Nakazawa T, Su SH, Hsieh CH, Ding TS - PLoS ONE (2015)

Bottom Line: Deviation from the model suggests that the net effect of species' interactions increases (accumulate) or decreases (repel) neighborhood species richness.We found that (i) accumulators were dominant at small interaction distances (<10-30 m); (ii) the detection of accumulator species was lower at large interaction distances (>30 m); (iii) repellers were rarely detected; and (iv) large-sized and abundant species tended to be accumulators.We hypothesized that the frequently disturbed environment of this subtropical rainforest (e.g., typhoon-driven natural disturbances such as landslides, soil erosion, flooding, and windthrow) might create the spatial heterogeneity of species richness and promote positive species interactions.

View Article: PubMed Central - PubMed

Affiliation: School of Forestry and Resource Conservation, National Taiwan University, Taipei, Taiwan; Institute of Oceanography, National Taiwan University, Taipei, Taiwan.

ABSTRACT
The spatial structure of species richness is often characterized by the species-area relationship (SAR). However, the SAR approach rarely considers the spatial variability of individual plants that arises from species interactions and species' habitat associations. Here, we explored how the interactions of individual plants of target species influence SAR patterns at a range of neighborhood distances. We analyzed the data of 113,988 woody plants of 110 species from the Fushan Forest Dynamics Plot (25 ha), northern Taiwan, which is a subtropical rainforest heavily influenced by typhoons. We classified 34 dominant species into 3 species types (i.e., accumulator, repeller, or no effect) by testing how the individual species-area relationship (i.e., statistics describing how neighborhood species richness changes around individuals) of target species departs (i.e., positively, negatively, or with no obvious trend) from a model that accounts for habitat association. Deviation from the model suggests that the net effect of species' interactions increases (accumulate) or decreases (repel) neighborhood species richness. We found that (i) accumulators were dominant at small interaction distances (<10-30 m); (ii) the detection of accumulator species was lower at large interaction distances (>30 m); (iii) repellers were rarely detected; and (iv) large-sized and abundant species tended to be accumulators. The findings suggest that positive species interactions have the potential to accumulate neighborhood species richness, particularly through size- and density-dependent mechanisms. We hypothesized that the frequently disturbed environment of this subtropical rainforest (e.g., typhoon-driven natural disturbances such as landslides, soil erosion, flooding, and windthrow) might create the spatial heterogeneity of species richness and promote positive species interactions.

No MeSH data available.


Related in: MedlinePlus

Proportion of species types along neighborhood distances.(A) Homogeneous and (B) heterogeneous Poisson  models for “large-large relationships” and (C) heterogeneous Poisson  model for “large-small relationships.” The broken, dotted, and solid lines indicate the positive, negative, and no deviation from conventional SAR in (A) and the accumulator, repeller, and no effect types in (B, C), respectively.
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pone.0124539.g002: Proportion of species types along neighborhood distances.(A) Homogeneous and (B) heterogeneous Poisson models for “large-large relationships” and (C) heterogeneous Poisson model for “large-small relationships.” The broken, dotted, and solid lines indicate the positive, negative, and no deviation from conventional SAR in (A) and the accumulator, repeller, and no effect types in (B, C), respectively.

Mentions: The 34 target species were classified into 3 types: positive, negative, and no deviation from SAR (homogeneous Poisson model; Fig 2A) and accumulator, repeller, and no effect (heterogeneous Poisson models; Fig 2B) (see S1 Table for each species classification). Positive departures from the models were the most dominant type at neighborhood distances <10–30 m, whereas most target species showed no deviation from the models at neighborhood distances >30 m. We found only a few target species that were repeller species. The ISAR goodness-of-fit tests for the large-large relationships produced consistent results. Specifically, under the homogeneous Poisson model, a high proportion of species with positive departures from the SAR were detected at relatively small neighborhood distances (62%, 62%, and 47% for 1–10 m, 11–20 m, and 21–30 m, respectively; Table 1). Under the heterogeneous Poisson model, the proportions of accumulator and “no effect” species were comparable at neighborhood distances <20 m, whereas the no effect type was dominant at large neighborhood distances (68%, 85%, and 88% for 21–30 m, 31–40 m, 41–50 m, respectively; Table 1). Repeller species were rare at all neighborhood distances (≤ 18%; Table 1).


Individual species-area relationship of woody plant communities in a heterogeneous subtropical monsoon rainforest.

Tsai CH, Lin YC, Wiegand T, Nakazawa T, Su SH, Hsieh CH, Ding TS - PLoS ONE (2015)

Proportion of species types along neighborhood distances.(A) Homogeneous and (B) heterogeneous Poisson  models for “large-large relationships” and (C) heterogeneous Poisson  model for “large-small relationships.” The broken, dotted, and solid lines indicate the positive, negative, and no deviation from conventional SAR in (A) and the accumulator, repeller, and no effect types in (B, C), respectively.
© Copyright Policy
Related In: Results  -  Collection

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Show All Figures
getmorefigures.php?uid=PMC4401546&req=5

pone.0124539.g002: Proportion of species types along neighborhood distances.(A) Homogeneous and (B) heterogeneous Poisson models for “large-large relationships” and (C) heterogeneous Poisson model for “large-small relationships.” The broken, dotted, and solid lines indicate the positive, negative, and no deviation from conventional SAR in (A) and the accumulator, repeller, and no effect types in (B, C), respectively.
Mentions: The 34 target species were classified into 3 types: positive, negative, and no deviation from SAR (homogeneous Poisson model; Fig 2A) and accumulator, repeller, and no effect (heterogeneous Poisson models; Fig 2B) (see S1 Table for each species classification). Positive departures from the models were the most dominant type at neighborhood distances <10–30 m, whereas most target species showed no deviation from the models at neighborhood distances >30 m. We found only a few target species that were repeller species. The ISAR goodness-of-fit tests for the large-large relationships produced consistent results. Specifically, under the homogeneous Poisson model, a high proportion of species with positive departures from the SAR were detected at relatively small neighborhood distances (62%, 62%, and 47% for 1–10 m, 11–20 m, and 21–30 m, respectively; Table 1). Under the heterogeneous Poisson model, the proportions of accumulator and “no effect” species were comparable at neighborhood distances <20 m, whereas the no effect type was dominant at large neighborhood distances (68%, 85%, and 88% for 21–30 m, 31–40 m, 41–50 m, respectively; Table 1). Repeller species were rare at all neighborhood distances (≤ 18%; Table 1).

Bottom Line: Deviation from the model suggests that the net effect of species' interactions increases (accumulate) or decreases (repel) neighborhood species richness.We found that (i) accumulators were dominant at small interaction distances (<10-30 m); (ii) the detection of accumulator species was lower at large interaction distances (>30 m); (iii) repellers were rarely detected; and (iv) large-sized and abundant species tended to be accumulators.We hypothesized that the frequently disturbed environment of this subtropical rainforest (e.g., typhoon-driven natural disturbances such as landslides, soil erosion, flooding, and windthrow) might create the spatial heterogeneity of species richness and promote positive species interactions.

View Article: PubMed Central - PubMed

Affiliation: School of Forestry and Resource Conservation, National Taiwan University, Taipei, Taiwan; Institute of Oceanography, National Taiwan University, Taipei, Taiwan.

ABSTRACT
The spatial structure of species richness is often characterized by the species-area relationship (SAR). However, the SAR approach rarely considers the spatial variability of individual plants that arises from species interactions and species' habitat associations. Here, we explored how the interactions of individual plants of target species influence SAR patterns at a range of neighborhood distances. We analyzed the data of 113,988 woody plants of 110 species from the Fushan Forest Dynamics Plot (25 ha), northern Taiwan, which is a subtropical rainforest heavily influenced by typhoons. We classified 34 dominant species into 3 species types (i.e., accumulator, repeller, or no effect) by testing how the individual species-area relationship (i.e., statistics describing how neighborhood species richness changes around individuals) of target species departs (i.e., positively, negatively, or with no obvious trend) from a model that accounts for habitat association. Deviation from the model suggests that the net effect of species' interactions increases (accumulate) or decreases (repel) neighborhood species richness. We found that (i) accumulators were dominant at small interaction distances (<10-30 m); (ii) the detection of accumulator species was lower at large interaction distances (>30 m); (iii) repellers were rarely detected; and (iv) large-sized and abundant species tended to be accumulators. The findings suggest that positive species interactions have the potential to accumulate neighborhood species richness, particularly through size- and density-dependent mechanisms. We hypothesized that the frequently disturbed environment of this subtropical rainforest (e.g., typhoon-driven natural disturbances such as landslides, soil erosion, flooding, and windthrow) might create the spatial heterogeneity of species richness and promote positive species interactions.

No MeSH data available.


Related in: MedlinePlus