Estimating species richness in tropical forest: the missing species extrapolation technique

ABSTRACTA new technique for estimation of tree species richness in tropical forests was developed and tested in this study. The missing species extrapolation technique is based on the assumption that the rate of accumulation of new species with increasing area is the same within sampled and unsampled areas of similar habitat within a region. This new technique was tested on four 1-ha sites of subtropical moist forest in Rio Bravo, Belize for which complete species counts of trees ≥10cm dbh are available. Estimates given by the technique are 115, 98, 93 and 106% of the actual species counts within the four sites. The accuracy of these estimates was found to be equal to or better than most others obtained by using existing methods of extrapolation. The missing species extrapolation technique was also applied to a 21-ha riparian forest patch in the Mountain Pine Ridge, Belize, where it was used to obtain an estimate of the number of tree species ≥10cm dbh in the entire patch.

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PRESERVATION OF PRIMARY FOREST CHARACTERISTICS DESPITE FRAGMENTATION AND ISOLATION IN A FOREST REMNANT FROM VIÇOSA, MG, BRAZIL1

Revista Árvore ◽

10.1590/0100-67622015000600001 ◽

2015 ◽

Vol 39 (6) ◽

pp. 985-994 ◽

Cited By ~ 5

Author(s):

Markus Gastauer ◽

Marcos Eduardo Guerra Sobral ◽

João Augusto Alves Meira-Neto

Keyword(s):

Species Richness ◽

Endemic Species ◽

Tree Species ◽

Primary Forest ◽

Forest Patch ◽

Diameter At Breast Height ◽

Breast Height ◽

Forest Remnant ◽

Primary Forests ◽

Biotic Resources

According to its owners, the Forest of Seu Nico (FSN) from the Viçosa municipality, Minas Gerais, Brazil, never has been logged and is therefore considered a primary forest. Nevertheless, the forest patch suffered impacts due to selective wood and non-timber extraction, fragmentation and isolation. Aim of this study was to test if the FSN, despite impacts, preserved characteristics of primary forests, which are elevated percentages of non-pioneer (>90%), animal-dispersed (>80 %), understory (>50%) and endemic species (~40%). For that, all trees with diameter at breast height equal or major than 3.2 cm within a plot of 100 x 100 m were identified. With 218 tree species found within this hectare, the FSN's species richness is outstanding for the region. The percentages of non-pioneer (92 %), animal-dispersed (85 %), understory (55 %) and endemic species (39.2 %) from the FSN fulfill the criteria proposed for primary forest. Therefore, we conclude that the FSN maintained its characteristics as a primary forest which highlights its importance for the conservation of biotic resources in the region, where similar fragments are lacking or not described yet.

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Spider assemblages on tree trunks in primeval deciduous forests of the Białowieża National Park in eastern Poland

Entomologica Fennica ◽

10.33338/ef.71219 ◽

2018 ◽

Vol 29 (2) ◽

pp. 75-85

Author(s):

Marzena Stańska ◽

Tomasz Stański ◽

Joanna Hawryluk

Keyword(s):

Species Richness ◽

Tree Species ◽

National Park ◽

Riparian Forest ◽

Abundant Species ◽

Deciduous Forests ◽

Forest Types ◽

Numerous Species ◽

Białowieża National Park ◽

Spider Abundance

We analysed spider assemblages of tree trunks in an oak-lime-hornbeam forest, an ash-alder riparian forest and an alder carr in the primeval stands of the Białowieża National Park. Spiders were collected from June 1998 to October 2000 using bark traps. A total of 2,182 spider individuals, belonging to 43 species and 14 families was collected. The forest types differed in the spider abundance and species richness. The differences probably resulted from different tree species and different environmental conditions in the forest types. The most numerous species in oak-lime-hornbeam forest and in alder carr was Amaurobius fenestralis, whereas Anyphaena accentuatawas the most abundant species in ash-alder riparian forest. Four species (Amaurobius fenestralis, Anyphaena accentuata, Segestria senoculataand Neriene montana) were collected in each month (March – October), whereas most species were recorded sporadically or in some periods.

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Effect of stand characteristics on tree species richness in and around a conservation area of Bangladesh

10.1101/044008 ◽

2016 ◽

Author(s):

Muha Abdullah Al Abdullah Pavel ◽

Sharif A. Mukul ◽

Mohammad Belal Uddin ◽

Kazuhiro Harada ◽

Mohammed Abu Sayed Arfin Khan

Keyword(s):

Species Richness ◽

Tree Species ◽

Linear Regression Analysis ◽

Tree Cover ◽

Systematic Sampling ◽

Conservation Area ◽

Forest Patch ◽

Important Species ◽

Tree Species Richness ◽

Stand Characteristics

We investigated the effect of tree cover, forest patch and disturbances on tree species richness in a highly diverse conservation area of northeast Bangladesh. A systematic sampling protocol was adopted and 80 sub-plots from twenty five 1 ha plots were used for the vegetation survey. Linear regression analysis was performed to understand the effect of patch area, disturbances and tree cover on tree species richness. Ordination using Redundancy analysis (RDA) and Non-metric Multi Dimensional Scaling (NMDS) were also performed to explore the tree species compositional similarities along the stand characteristics gradient and locations of the sample plots. Our study revealed that, forest patch size has greater influence on species richness. Areas with medium level of disturbances have shown greater species richness. In constrained ordination the selected explanatory variables regulated the richness of common species. Our ﬁndings can be useful for better forest management and restoration of landscapes of conservation needs using ecologically important species.

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THE ABUNDANCE OF KARST-RIPARIAN FOREST IN THE CATCHMENT AREA OF SAMPOLAWA RIVER BAUBAU, SOUTHEAST SULAWESI

KnE Life Sciences ◽

10.18502/kls.v2i1.217 ◽

2015 ◽

Vol 2 (1) ◽

pp. 557

Author(s):

La Ode Muhammad Erif ◽

Tjut Sugandawaty Djohan

Keyword(s):

Species Richness ◽

Tree Species ◽

Drainage Basin ◽

Riparian Forest ◽

Fundamental Aspect ◽

Primary Forest ◽

River Ecology ◽

Allochthonous Inputs ◽

Karst Ecosystem ◽

Tree Sapling

Riparian forest is a source energy and matter for the aquatic ecosystem. The abilities of riparian forest are to control and recycle the allochthonous inputs from the upland drainage basin and the river itself. This processess are a fundamental aspect of river ecology. We studied the riparian forest in karst ecosystem setting, at the protected forest of Sampolawa headwaters river, Baubau, Southeast Sulawesi. We focussed on the structure and composition of species richness of the forest. Data were collected using quadrate methods, 20mx20m, with 4 replicates placed at each river side. Results reveal that the forest compossed of 7 growth-forms, trees, saplings, seedlings, palm, herbs, liana, and spike moss. The tree species richness of tree and sapling was 33 and 37 species in consecutively. The tree species of Sphatolobus sp., Aglaia silvestris, and Canarium asperum dominated this riparian forest. Similarly the sapling dominance were Sphatolobus sp., Aglaia sp., and Chrysophyllum lanceolatum, as well as the seedlings of Sphatolobus sp., Palaquium obovatum and Chrysophyllum lanceolatum. Thus, the Sphatolobus sp. will be the future tree. However, Anthocephalus macrophyllus saplings were not found, thus this tree was endangered. Soil nutrients of NO3, NH4, PO4, and C organic were high, which indicated that the litterfall decomposition occurred at the forest riparian floor. The Riparian forest was a primary forest and very diversed in species richnes but had low densities. All the tree, sapling, and seedling species characterized the riparian forest of karst ecosystem at the headwaters of Sampolawa River in the karst ecosystem setting. Keywords: Anthocephalus, karst-riparian forest, headwaters

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