The General Ecology class (SCBI 399) at Salaya, Friday 15 January 2010
Detail: The General Ecology class (SCBI 399) at Salaya, Friday 15 January 2010
By P.D. Round
During an all-day field exercise conducted as part of the General Ecology class, 47 species of birds were recorded in total on the different sectors of the Mahidol University campus, Nakhon Pathom.
The richest sector was sector 5 (the least built-up sector, including the herb garden and arboretum) in which 28 species were recorded. Sector 6/7 (which includes the water treatment ponds) was also relatively species-rich, with 26 species. 1624 species per sector were recorded on each of the other four sectors all of which were more built-up and were expected, therefore, to support fewer species.
The total included both resident and migrant birds. Scarcer species included Little Grebe นกเป็ดผีเล็ก, Whiskered Tern นกนางนวลแกลบเคราขาว and Common Kingfisher นกกะเต็นน้อยธรรมดา (on the water bodies), Red-rumped Swallow นกนางแอ่นตะโพกแดง (an aerial insectivore) and Spotted Owlet นกเค้าจุด
10-species MacKinnon Lists were used to generate a species accumulation curve (sample-based rarefaction curve) using the software EstimateS (Colwell 2006) and the data compared with that obtained from a similar exercise conducted in December 2006 (Figure1).
The shape of the curve was similar in both years, with a Mau Tau estimate of 41.4 species recorded on 20 lists in 2010 compared with 44 species in 2006, suggesting that bird diversity has continued to decline due habitat destruction caused by development. Since the campus was first surveyed for birds in 19871988 (Brockelman et al. 1993) most open marshy areas have long since been reclaimed and built on, and a great number of species have been lost.
The campus has lost further habitat in the intervening years since 2006 and much of it now resembles a giant building site. Many of the commoner bird species associated with planted trees have been lost or have declined as trees have been cut down and removed.
Some of the birds seen during January 2010 (e.g., Asian Openbills นกปากห่าง and Little Cormorants นกกาน้ำเล็ก) were those that overflew the campus from the surrounding areas. They did not actually use habitats on the campus but because they were nevertheless sighted and recorded, they inflated the apparent species richness. If the survey was limited to just those species that utilise the campus for their ecological needs, then bird species-richness would be much lower.
The survey was relatively coarse definition since many students, lacked previous expertise in finding and identifying birds. Nevertheless, original data that yielded instructive results was collected in the course of classwork. Moreover, the exercise was a lot of fun, and there was a good deal of interest and excitement that so many birds could still be found considering the present state of the Salaya campus.
Spotted Hoodwinks (species of birds identified in error by students) included such rare forest species as Red-crowned Barbet and Black Magpie. These were discounted from the data set, but they were good for a laugh when we came to analyze our data.
One interesting curiosity was a partial albino White-vented Myna, seen together with typical black-plumaged members of the same species.
Brockelman, W. Y., S. Srikosamatara, P. D. Round, and P. Poonswad. 1993. Seasonal and habitat distribution of birds in the Central Plain: A survey at Salaya, Nakhon Pathom, Thailand. Nat. Hist. Bull. Siam Soc. 41 (1): 1-22.
Colwell R.K. 2006. EstimateS: Statistical estimation of species richness and shared species fromsamples. Version 8. Users Guide and application published at http://purl.oclc.org/estimates.
By: Webmaster (on behalf of Aj.Phil) January 19, 2010 22:57
Message 1: นกที่ศาลายาน่ารักและสวยมากค่ะ อยากไปเรียนกะอาจารย์ Phil อีก^^
By: January 20, 2010 03:52
Message 2: นกเอี้ยง Albino นั่นแปลกดีค่ะ