Hydrology Affect Habitat Characteristics of Mortonagrion hirosei in Wugu Wetland
Date Issued
2012
Date
2012
Author(s)
Chen, Yi-Jiun
Abstract
The damselfly, Mortonagrion hirosei, is near threatened by IUCN 2001. The insect is extremely narrow range of activities, only lives in reed community of brackish water wetland in Wugu Wetlands, New Taipei City of Taiwan. By this study investigated mainly by five environmental factors affected , respectively, water salinity, dissolved oxygen, water depth, soil organic matter and reeds.
The damselfly lives under high concentration of saline water and soil habitat. The salinity of water to an average of 8.80‰. High salinity water lead to plant to become single, and then biological diversity become low. The M. hirosei in this habitat will not competition with other species. Reed is generally growth below 50 cm depth. In this study, M. hirosei habitat depth neither more than 30cm deep, and are suitable for reed growth here. However, if the reed growth too dense, the DO will become low. In this study, 0~3mg/L DO. Most of the biological can not survive on DO less than 3mg/L of water, so few natural enemies in this habitat. Furthermore, soil organic matter need to be high, because it can known that plant grow in the habitat. M. hirosei habitat have more dry reed, and the corruption of the reed allows the soil organic matter increased, so that many plankton in this habitat, thereby increasing the predation of the object. Soil organic matter average of 7.53%. In addition, the study found that the different habitat but have similar conditions of the environmental factors, but did not found the M. hirosei. Inference for the difference by the soil organic matter. Plant growth situation reflected in the soil organic matter. In plant, the dominant species on this habitat is reed. Reed help M. hirosei to survive in the habitat with high degree of privacy, that can avoided other flying of biological prey.
This study aims to investigate the M. hirosei in the environment of the adult stage, which found that male and female habitat selection is somewhat different. The survey found that the main factor for DO and water depth differences. Male than female in the habitat have high dispersion. Therefore, male require more DO in the habitat to facilitate the distribution of the different places in the habitat. By this study, the obvious M. hirosei to select very specific habitat.
Subjects
Mortonagrion hirosei
Wugu wetland
habitat
environmental factors
salinity
SDGs
Type
thesis
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