pahawkowl ([info]pahawkowl) wrote,
@ 2007-12-21 20:20:00
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Wood Thrush and Fragment Use in the Suburban Parkland
Censusing small, medium, and large suburban park wooded fragments, I did one of the most simplest and efficient ways to express center and spread in statistics by figuring out the median (m) and doing a quantile analysis, in this case, a quartile analysis. One must always express a spread as well as a center to demonstrate the way the data is distributed, but even sometimes professionals overlook this. Sense you cannot do standard deviation or standard error of a median, I will post later what is know as an ICR: with the data. I used not the n, but a log index of n. Haila et al (1993) used the Poisson Distribution to "predict" the outcome in a Finnish archipelago of fragments in the southern taiga. I found that Wood Thrush occupied the middle two quartiles the most, though inside the fragment as opposed to the edge. Cornell Lab's Birds of Forested Landscape program found that area-sensitive songbirds like Scarlet Tanager and forest thrushes need a radius of at least 300 yards to reproduce, which may indicate that none of my singing males were productive, but floaters (Lowe pers. com.). I censused about 8 fragments. More samples are needed. A distribution like Poisson or Normal Distribution then possibly could be utilized to better confirmed statistical power and calculate a more true median.



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ref. for haila et al
[info]pahawkowl
2007-12-22 01:12 am UTC (link)
Haila et al. 1993. Turnover of breeding birds in small forest fragments: the "sampling" colonization hypothesis corroborated. Ecology 74(3): 714-725.

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