明天3/3第二次meeting~~

Dear all:

明天由我來為大家主講
Vegetation Structure and Patch Size Sustain High Alpha Avian Species
Diversity in Mosaic Landscape in Taiwan

內容主要是我在寒假分析語撰寫的一些結果
還有我跟丁老師一連串修修改改的摘要，
開學當天已經送去給ESA了
接著會不會通過審核就看老天啦

那個就明天3/3 12:20 lab401 準時開講～
謝謝捧場

書面內容如下囉

大利

Vegetation Structure and Patch Size Sustain High Alpha Avian Species
Diversity in Mosaic Landscape in Taiwan

Da-Li LIN and Tzung-Su DING

School of Forestry and Resource Conservation, National Taiwan University
No.1 Sec. 4 Roosevelt Rd. Taipei 106, TAIWAN

Habitat selection is a process that influences survival and ultimate fitness
of animals. In general, birds select habitats among various landscape
components based on patch size, vegetation vertical structure, or floristic
composition; and this explains why large forest stands usually support higher
bird species richness. However, some highly fragmented landscapes still
support high bird species richness. We mapped the locations of all observed
bird individuals in Meifeng Highlands Experimental Farm of National Taiwan
University (24° 05'N, 121° 10'E) by territory mappings during the breeding
seasons from 2005 to 2007. We classified the 50 ha study area into 15
landscape types by aerial photograph and measured vertical structure and
floristic composition of vegetation in each patch in 2007. We recorded 66 bird
species in 213 patches which were grouped into four major habitat types:
forests, plantations, fields, and orchards. Forests and plantations had more bird species than fields and orchards. The z value in the species-area relationships of bird species in forests and plantations were significantly lower than fields and orchards but showed no significant difference between forests
and plantations. Forests had significantly more plant families in canopy layer than plantations but were similar in the number of plant families in sub-canopy layer. Path analysis suggests sub-canopy played an important role in sustaining diverse bird community in plantations, especially in very small patches. We conclude that patch size is still a major factor to sustain native biodiversity in fragmented landscapes but in small patches both vegetation vertical tructure and floristic composition are key factors to sustain higher native biodiversity.

Background Knowledge

The species-area relationship (SAR) is one of the oldest and most
general patterns in biogeography. This relationship has been sought for variety
of taxa (Connor & McCoy, 1979). Species richness is most often related to area by the power function (1) (Fig. 1a).

S = CA^Z(1)

In this function, S is the species richness (number of species), A is the
area, and C and z are fitted constants. The constants are estimated typically
through linear regression on the logarithmic form of equation (2) (Fig. 1b).

log S = log C + z log A(2)

In this equation, C represented the intercept, z the slope. Primary interest
in the species-area relationship has been to attach biological meaning to
observed values of the intercept and slope (Connor & McCoy, 1979; Gilbert,
1980). The species-area relationship has been proposed as a model of the
optimal design of nature reserves. For example, the habitat diversity hypothesis (Williams, 1964) had been proposed to account for the species-area relationship. In recent years, the species-area relationship ihad been developed another form of function to predict biodiversity, such as species-habitat relationship (SHR), species-time relationship (STR), species-individual relationship (SIR), and species-time-area relationship (STAR)…etc.


Reference

Connor, E. F. & McCoy, E. D. 1979. the statistics and biology of the
species-area relationships. American Naturalist, 113: 791-833.

Gilbert, F. S. 1980. The equilibrium theory of island biogeography: fact or
fiction? Journal of Biogeography, 7: 209-235.

Williams, C. B. 1964. Pattern in the balance of nature. Academic Press, New
York.