排序方式: 共有106条查询结果,搜索用时 31 毫秒
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Gulkowska A He Y So MK Yeung LW Leung HW Giesy JP Lam PK Martin M Richardson BJ 《Marine pollution bulletin》2007,54(8):1287-1293
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Li F Yang Q Zan Q Tam NF Shin PK Vrijmoed LL Cheung SG 《Marine pollution bulletin》2011,62(9):1957-1962
Construction cost (CC) is a quantifiable measure of energy demand for biomass production, and low CC is hypothesized to give an alien plant growth advantages and increase its potential to be an invader. Comparison of leaf CC and growth traits between alien and native mangroves in Shenzhen Futian Nature Reserve showed CC per unit mass (CCmass), carbon concentration and gross and ash-free caloric values of alien mangroves were significantly lower than those of native species, while the height and chest circumference were just the opposite. Alien species Sonneratia apetala had the lowest CCmass while Sonneratia caseolaris had the lowest CCarea, and were 8.99% and 32.17% lower than those of native species, respectively. Conversely, specific leaf area (SLA) of these two Sonneratia species was significantly higher than native species. Lower CC and higher SLA make the two Sonneratia species grow and spread faster than other mangroves and enhance their invasive potential. 相似文献
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The effects of hypoxia on the larvae of two sub-tidal nassariid gastropods, Nassarius siquijorensis and N. conoidalis were compared so as to understand how the species-specific tolerance to hypoxia might have resulted in changes in the abundance and distribution of these two species in the hypoxic Tolo Harbour, Hong Kong, since the 1980s. Respiration rates of N. siquijorensis and N. conoidalis larvae were reduced at 4.5 mg O2 l(-1), or below, as compared with the normoxic control. Significant reduction in swimming velocity was also observed for 10-day old larvae which were exposed to <2.0 mg O2 l(-1) for N. siquijorensis and <1.0 mg O2 l(-1) for N. conoidalis. The 48 h LC50 values of N. siquijorensis and N. conoidalis larvae were 0.7 and 1.7 mg O2 l(-1), respectively. The results suggested that N. siquijorensis are more tolerant to hypoxia than N. conoidalis. 相似文献
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Impact of hypoxia on the structure and function of benthic epifauna in Tolo Harbour, Hong Kong 总被引:1,自引:0,他引:1
In Tolo Harbour, Hong Kong, where hypoxia occurs periodically, a large amount of benthic epifauna was found to be absent in the summer but become abundant again in the winter. This observation may indicate that some species are sensitive in detecting low dissolved oxygen (DO) levels and are able to escape from the harbour to more oxygenated, open waters when conditions deteriorate and return when DO levels are improved. Analysis of biological traits of these animals showed that 58% of the categories showed significant differences between the community structure in summer and winter. The significant biological traits of the few species, which remained in the harbour under the summer's hypoxic conditions suggested adaptation rather than opportunism to the low DO levels. Our data also showed that trawling can increase DO at the bottom and may benefit the less sensitive species that remained in the habitat during the summer. 相似文献
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比例尺对地球化学异常解释的影响 总被引:1,自引:0,他引:1
地球化学调查的作用随比列尺的不同而变化.对区域地球化学调查所获异常的解释,必须考虑调查中不同比例尺在性质和目的上的差异,不应对区化资料作"超负荷解释".寻找特定矿床类型或研究特殊元素组合时,应采用中或大比例尺追踪调查.文中列举了4个干旱环境的案例,以说明区域调查和详查之间异常模式有明显不同. 相似文献
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