Yam R.S.W.,National Taiwan University |
Huang K.-P.,National Taiwan University |
Hsieh H.-L.,Academia Sinica, Taiwan |
Lin H.-J.,National Chung Hsing University |
Huang S.-C.,Taiwan Wetland Society
International Journal of Environmental Research and Public Health | Year: 2015
Natural wetlands have been increasingly transformed into urbanized ecosystems commonly colonized by stress-tolerant non-native species. Although non-native species present numerous threats to natural ecosystems, some could provide important benefits to urbanized ecosystems. This study investigated the extent of colonization by non-native fish and bird species of three urbanized wetlands in subtropical Taiwan. Using literature data the role of each non-native species in the urbanized wetland was evaluated by their effect (benefits/damages) on ecosystem services (ES) based on their ecological traits. Our sites were seriously colonized by non-native fishes (39%–100%), but <3% by non-native birds. Although most non-native species could damage ES regulation (disease control and wastewater purification), some could be beneficial to the urbanized wetland ES. Our results indicated the importance of non-native fishes in supporting ES by serving as food source to fish-eating waterbirds (native, and migratory species) due to their high abundance, particularly for Oreochromis spp. However, all non-native birds are regarded as “harmful” species causing important ecosystem disservices, and thus eradication of these bird-invaders from urban wetlands would be needed. This simple framework for role evaluation of non-native species represents a holistic and transferable approach to facilitate decision making on management priority of non-native species in urbanized wetlands. © 2015 by the authors; licensee MDPI, Basel, Switzerland.
Yang S.-C.,Taiwan Typhoon and Flood Research Institute |
Shih S.-S.,National Taiwan University |
Hwang G.-W.,National Taiwan University |
Adams J.B.,Nelson Mandela Metropolitan University |
And 2 more authors.
Ecological Engineering | Year: 2013
In order to test whether salinity gradient influences inundation tolerance thresholds of mangrove forests, we used validated hydraulic and dispersion model to characterize these two abiotic environmental factors on four riparian mangrove forests, namely Wazwei, Zhuwei, Guandu, and Shezi, with only one mangrove species (Kandelia obovata) in the Tanshui River system. The results showed that the inundations of the highest and the lowest elevations for mangrove growth both increase while salinity decreases. In other words, mangrove inundation tolerance is found to be inversely dependent on salinity concentration. The inundations of K. obovata growth were 0.35-22.11% (0.08-5.31. h/day), 1.82-24.99% (0.44-6.00. h/day), 3.75-39.99% (0.90-9.60. h/day), and 5.73-38.25% (1.38-9.18. h/day) on the Wazwei, Zhuwei, Guandu, and Shezi wetlands respectively due to different annual mean salinity (28.57, 21.30, 11.98 and 10.01 ppt for the Wazwei, Zhuwei, Guandu, and Shezi wetlands respectively). Mangrove forests with lower salinity condition, such as the Guandu wetland, have higher potential to invade into river and to occupy flow area, and thus damage flood prevention project. These mangrove forests need not only protection projects but also further management projects, such as regular artificial forest thinning. In addition, under consideration of salinity and inundation frequency alteration, the K. obovata forests on the Zhuwei wetland and the Guandu wetland would vanish around 63% and 35% by 2100, because landward migration would be limited by levees. The difference of mangrove loss rate is due to different local topography. A binomial distribution representing the relationship of annual mean salinity and inundation frequency was developed for evaluating appropriate hydrological regimes of mangrove growth as well. It is also suggested to guide a suitable restoration project and predict mangrove forest loss due to sea level rise. © 2012 Elsevier B.V.
Chen C.-P.,Guangxi Academy of science |
Chen R.-F.,Guangxi Institute of Oceanology |
Chen R.-F.,Guangxi Key Laboratory for Marine Biotechnology |
Chen P.-H.,Taiwan Wetland Society |
And 3 more authors.
AACL Bioflux | Year: 2016
The populations of the ‘living fossil’ horseshoe crab Tachypleus tridentatus have decreased dramatically. Releasing juveniles in large quantities, preferably at up to the third instar stage and with better survival in the wild, would be an effective method for replenishing the populations. However, the mortality between second instar and third instar stages is high according to indoor, monospecies culture results. We conducted an outdoor culture of juvenile crabs mixed with juvenile spotted babylon (Babylonia areolata) and found that this technique could enhance the horseshoe crabs’ survival, accelerate their molting and produce large numbers of juveniles. At the final harvest time, after running the mixing culture for 150 days, horseshoe crab juveniles exhibited survival of 32.5% and production of 66,000 individuals with ages beyond the second instar. Spotted babylon had a survival rate of 87.3%. The resultant survival and abundance levels were greater than those previously reported. We propose that these profound results can be attributed to 1) abundant benthic algae grow in outdoor ponds under sunlight, 2) the commensal lifestyle of juvenile horseshoe crab and spotted babylon, which likely prefer different food particle sizes, 3) the behaviors of spotted babylon, such as burrowing and moving in the sediment substrata, probably create an environment that favors horseshoe crab growth, 4) large amounts of space in the outdoor ponds, which improves growth for unknown reasons, and 5) suitable weather conditions from November to April in Guangxi. © 2016, BIOFLUX SRL. All rights reserved.
Chen P.-C.,National Taiwan University |
Tzeng T.-D.,Shu-Te University |
Shih C.-H.,Tungnan University |
Chu T.-J.,Taiwan Wetland Society |
And 2 more authors.
Limnologica | Year: 2015
Morphometric differences were used to elucidate the stock geographic variations and phylogeography of Macrobrachium nipponense in Taiwan. Eight samples were collected from three estuaries (Tamsui River Estuary [TSE], Kaoping River Estuary [KPE], and Houlung River Estuary [HLE]) and five reservoirs (Shimen Reservoir [SMR], Mingde Reservoir [MDR], Deji Reservoir [DJR], Tsengwen Reservoir [TWR], and Chengqing Lake Reservoir [CLR]). Twelve morphometric measurements were size-standardized by the allometric method and via Cluster Analysis and Canonical Variate Analysis (CVA). Randomisation tests were used to verify the morphometric variation between groups. The results clustered the eight samples into a minimum of three groups. The first group included four reservoir samples (i.e. DJR, MDR, CLR, and TWR); the second included the SMR sample, and the third comprised the remaining estuarine samples (i.e. TSE, HLE, and KPE). Morphometric variation among the three groups was significant for each sex. Significant differences between these three groups may be derived from evolutionary origins, geographic events or environmental adaption which was discussed in the paper. The difference between multivariate allometric coefficients in both sexes and sites were also tested based on the eight group data sets, and the result showed that the difference between sexes was significant. © 2015 The Authors.
Fang W.-D.,Taiwan Wetland Society |
Fang W.-D.,Zhonghua University |
Xie H.-N.,Zhonghua University |
Zhu D.-R.,Taiwan Wetland Society |
And 3 more authors.
Wetland Science | Year: 2010
Zhonghua University designated by the Construction and Planning Agency Ministry of the Interior commissioned by Hsinchu County, Chinese Taiwan, the distribution of marine fauna have been recorded according to protected area survey from "Coastal Zone Act" (draft) in Chinese Taiwan in 2009 . We detected main classes of animals, such as mammals, birds, fishes, reptiles, amphibians, and invertebrates, etc. The animal distribution used to calculated Shannon - Wiener diversity index values of the Kriging estimation obtained a total of 24 sets of outline plans, and compiled the outline of the animal diversity plans after the summer ' s and fall ' s demonstration , which Chu - peicoastal primary forest consists highest biological diversity, namely, 8 classes, 29 orders, 86 families, and 137 species of animals.