Movement patterns of surf-zone fish species in a subtropical marine protected area on the east coast of South Africa

A long-term mark-recapture study was used to assess the movement patterns of surf-zone fishes in the St Lucia Marine Reserve, a marine protected area within the iSimangaliso Wetland Park, a World Heritage Site on the east coast of South Africa. Between 2001 and 2013, 6 613 fish from 71 species, caught by hook and line, were tagged at four sites within and adjacent to a no-take marine sanctuary area. A total of 1 004 (15.2%) recaptures were made from 17 species. The majority (82.4%) of these species displayed station-keeping behaviour, whereas only three were classified as wider-ranging species, and no species with discernible migratory behaviour was observed. Findings for five species with the highest recapture rates, namely Pomadasys furcatus, Epinephelus andersoni, E. marginatus, Dinoperca petersi and Lutjanus rivulatus, are presented in greater detail. Recapture rates ranged from 7% to 50% and time at liberty from 0 to 3 163 days. Individuals of all five species displayed station-keeping behaviour, with the 95th percentile of intra-study-site movements varying between 200 and 1 025 m (linear distance). However, four of the five species also displayed some ranging behaviour and made exploratory excursions ranging from 3.5 to 125 km, in both northerly and southerly directions. The dominance of station-keeping behaviour suggests that the St Lucia Marine Reserve sanctuary zone provides an important refuge for these species, with some export to adjacent areas.     

澳大利亚昆士兰地区地形地质图的数学基础探讨

通过WGS-84坐标系、通用横轴墨卡托投影原理和实际应用的介绍,对澳大利亚昆士兰地区地形地质图的数学基础进行初步探讨,掌握利用MapGIS制作外国地形地质图的过程和方法,为拓展地质找矿空间打下基础。     

贵州三叠纪自然遗产及世界地质公园申报

贵州三叠纪地质—古生物遗迹景观资源的特点是拥有六个世界之最:(1)全球最宏伟、演化历史记录最详尽的三叠纪浅海—深海过渡带;(2)全球保存最系统全面的三叠纪海陆变迁遗迹景观;(3)全球保存最好,研究程度最高的三叠纪孤立碳酸盐岩台地——大贵州滩;(4)全球最丰富多彩的三叠纪海生爬行类—海百合化石群;(5)全球最早、最大的三叠纪Tubiphytes生物礁;(6)全球最好的三叠纪深水遗迹化石群。这些遗迹景观是世界级的自然遗产,应加以保护并据此创建贵州三叠纪世界地质公园。     

稀土资源储备刻不容缓

本文基于全球稀土资源供需形势和我国储量减少的趋势分析了我国开展稀土资源储备的紧迫性.从储备规避“世贸规则”进行间接控制出口、增强在国际稀土市场的话语权以及降低国家外汇储备风险三个方面阐明了我国开展稀土资源储备的必要性.通过借鉴美国和日本在稀土矿产地和矿产品储备方面的成功经验,结合我国稀土资源储备现状,初步构建了适合我国...     

Exposure to extreme climate decreases self-rated health score: Large-scale survey evidence from China

High temperature is a growing threat and impacts public health through different exposure mechanisms. Our study constructs a comprehensive exposure measurement based on temperature variability, duration, and effective influence range. We investigate human responses to high temperatures through self-rated health scores based on individual-level data from China Labor-force Dynamic Survey (CLDS). Results show that higher temperature and temperature variability significantly decrease self-rated health scores. Subjective health risk is most significantly related to the cumulative temperature in the previous two weeks. We also find that the exposure effects at night and on weekdays are more severe. Workers who experience greater exposure from commuting and work environments are negatively impacted by high temperatures. In addition, men, the elderly, middle and low education groups, rural residents are more likely to be impacted by high temperatures.