| Summary: | 碩士 === 國立彰化師範大學 === 生物學系 === 90 === The Su Tsao Wild Life Reserve is a very important perching habitat in southwest Taiwan for winter migrant birds. Feeding is the main activity to wintering shorebirds. Therefore, the exclosure experiment and the analysis of stomach content in shorebird were designed to assess the impact of feeding activities of winter shorebirds on the prey abundances in this Reserve Area.
According to the experimental results and statistic analysis, I concluded that: (1) Except water depth, other environmental factors were no significance differences in every experimental day. (2) Feeding of shorebirds declined the numbers of the invertebrates, however, the numbers of birds were few, the numbers of the invertebrates no significant declined. (3) The reduced quantity of invertebrates was positively correlated with the numbers of shorebirds. (4) From the study of stomach contents, shorebirds consumed Thiara riqueti, Neanthes glandicincta, and Capitellidae sp.1. Exclosure experiment produced the same result. (5) At night, shorebirds still fed and reduced the numbers of invertebrates.
The result also presented that the distribution of shorebirds was no concern with the invertebrate numbers. The possible reason for this would be the invertebrates were abundant to supply the consumptions of shorebirds. The feeding rate of shorebirds might be over estimated by mathematical magnification. In addition, more information about resident invertebrates, such as life cycle and activity times, will provide more thorough understanding in the feeding ecology of winter shorebirds.
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