ISSS608 2017-18 T3 Assign Sun Shuangtian Conclusion
VAST 2018 Mini Challenge 1
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Answer for Question1
Using the bird call collection and the included map of the Wildlife Preserve, we detect the migration of one group of Blue Pipit moved away from the dumping site in 2015. In 2016 and 2017, this group of birds stopped moving further and settled down. Besides, in 2014, Blue Pipits weren’t observed singing near the dumping site, after they move south, songs of this group of Blue Pipit were recorded again from 2015 onwards. Additionally, other species such as Queenscoat and Orange Pine Plover hardly migrate from their habitat over the years. Therefore, we could conclude that there must be something unusual near the dumping site from 2014 onwards which cause Blue Pipit to move. This finding is corresponding with the result of VAST 2017 that the Kasios Furniture manufacturing company may have been a primary contributor to the apparent reduction of the number of nesting pairs of the Rose-Crested Blue Pipit by surreptitiously dumping process waste in the northeast region of the Preserve.
Answer for Question2
The set of bird calls supplied by Kasios can’t support their claim of Pipits being found across the Preserve. By breaking the recording files in R, we detect that only 5 out of 15 of the recordings have similar frequency as the call/song frequency of Rose-crested Blue Pipit. The other 10 recordings from Kasios can’t be identified as Blue Pipit sounds according to their frequency. Besides, the location of the birds observed by Kasios are not locations where Blue Pipits usually appear in the Preserve. Therefore, we suspect that Kasios provided recordings of other species and claimed them to be Blue Pipits.
Answer for Question3
Base on the Blue Pipit migration pattern and the result of Kasios’ recording investigation, we deduce that Kasios started dumping toxic waste from 2014 onwards which caused one group of Blue Pipits migrate away from their original habitat. This hypothesis can be supported by the evidence we found in previous two sections which are summarized below:
• In 2014, one group of Blue Pipit weren’t found singing near the dumping site.
• In 2015, this group of Blue Pipit migrate away from the dumping site.
• From 2015 to 2017, this group of Blue Pipit were found singing again after migrating and they stop further migrating.
• Other species such as Queenscoat and Orange Pine Plovers weren’t found migrating around the Preserve which suggested that bird do not normally migrate from their original spot.
• 10 out of 15 Bird recordings from Kasios can’t be identified as sound of Blue Pipits.
