Playing Lotto with Rotto? Tourism,the environment and gambling with the ethos of a Western Australian island

Rottnest Island is a popular holiday destination offshore from Perth, the capital city of Western Australia. Rottnest (or Rotto) attracts approximately 500 000 visitors annually. The island is managed by a statutory government authority, the Rottnest Island Authority (RIA), for the purposes of providing recreation and holiday facilities and services, and protecting its natural and cultural values. While there are advantages in management by one body, there appears to be a conflict in managing both the tourism business and the environment, largely as a result of funding issues. While further tourism development would boost the RIA's self-funded operating budget, increased pressures may compromise the island environment and the Rottnest ethos, which revolves around a relaxed and casual social ambiance. The RIA aims to develop Rottnest as a model for sustainability, but are dilemmas surrounding economic sustainability potentially risking the island's environmental and social sustainability? This paper concludes that in the pursuit of economic returns from tourism, Rottnest Island's environmental and social values face an uncertain future.     

海岸工程中海浪数值模拟和环境参数选取的进展

主要介绍了我国近的来在海岸工程设计，建设中有关海浪数值模拟及环境参数选取方面的研究进展。     

铅对日本沼虾精子超微结构的影响

用铅 ( Pb2 + )溶液的 72 h半致死浓度处理日本沼虾 ,发现日本沼虾的精子结构受到严重破坏。主要表现在精子顶体的解体、顶体及核物质的大量丢失以及精核形态的变化上 ,这种类型的精子失去了正常受精的能力 ,直接导致个体的不育 ,使自然种群繁殖率下降。虾蟹类精子结构的变化可以作为监测环境污染的重要形态学指标。     

江苏金坛新石器时代环境变迁研究

对江苏金坛三星村新石器遗址ＪＳ９８Ｔ０８２０号探坑南壁剖面进行采磁,对样品帮了粒度、地球化学、孢粉、微体古生物（有孔虫和介形类）等环境替代指标的测定与分析,并据此初步研究和恢复了该区新石器时代古定变状况,得出以下几点认识：（１０地球化学分析结果本区知全新世以来,气候有从暖湿向干冷变化的总趋势。（２）Ｐ２Ｏ５的含量在马家浜墓葬层和崧泽文化层可达生土层的５～６倍,充分反映了当时人类活动日益频繁,同时也     

厦门寨后垃圾填埋场释气影响及其控制

本文是在承担厦门市寨后“垃圾埋场”工程环境影响评价的基础上,对该填埋场的垃圾释气规律作进一步研究。研究结果表明,（１）厦门煤气的普及率较高;（２场营运１１ａ左右,废气产物量及排一达到最大值;（３）于小风条件下,在下风向５０ｍ处,ＣＨ４浓度可达爆炸极１６￣３１％,所产生的恶臭气体Ｈ２Ｓ的影响距离经ＮＨ３大,在下风向５００ｍ下才能达到２级场界标准;（４）严格按卫生填埋的技术标准进行规范操作,确保排气管     

福建滨海沙滩保护和利用的建议

据调查,福建沿海分布有143处主要滨海沙滩,其中已开发利用28处,可合理利用81处,需加强生态保护修复的有21处,被严重破坏已不适宜做海滩资源的有13处。本文在介绍福建滨海沙滩分布及其资源特点基础上,阐述了沿海各地海滩资源的保护与利用现状,分析了主要的资源环境问题及成因,提出了制度建设、资源管控、优化岸滩工程、污染治理、公众宣传、资金保障等有针对性的对策措施。     

赤点石斑鱼(Epinephelus akaara)精子超微结构及环境因子对精子活力的影响

为揭示赤点石斑鱼精子的超微结构及环境因子对其精子活力的影响,利用扫描电镜和透射电镜观察赤点石斑鱼精子的超微结构,设置不同梯度的温度、盐度、pH值及不同浓度的NaCl、KCl、CaCl₂、MgCl₂、EDTANa₂溶液,探究这些因子对赤点石斑鱼精子活力的影响。结果表明:赤点石斑鱼成熟精子的结构特点是细胞核圆形或卵圆形,核内染色质致密,没有核泡(核空隙)。精子尾部细长,横切面为典型的"9+2"微管结构。温度、盐度、pH值等环境因子对精子活力的影响表明,精子活力的适宜温度范围为23~31℃,27.5℃时精子寿命最长为37min;适宜的盐度范围为15~35,盐度15时精子寿命最长为50min;适宜的pH范围为7~9,pH为9时精子的运动时间最长为33min。赤点石斑鱼精子在EDTANa₂溶液中呈抑制状态,在400~700 mmol/L的NaCl溶液、400~600mmol/L的KCl溶液和500 mmol/L的CaCl₂溶液中精子均具有较好的活动能力。在MgCl₂溶液中赤点石斑鱼精子的活动能力不佳。赤点石斑鱼精子的最适温度范围与繁殖季节的最适水温范围符合,适宜盐度范围较广,对pH值的变化适应性较强。赤点石斑鱼精子在NaCl、KCl、CaCl₂溶液中活力较佳,在MgCl₂溶液和EDTANa₂溶液中呈抑制状态。     

Variable orientation within a natural population of the sandhopper Talitrus saltator (Crustacea: Amphipoda) as a response to a variable environment: The case-study of Berkoukesh beach,Tunisia

Sandy beaches are harsh environments, driving resident arthropod populations to various typical adaptations, particularly behavioural ones. Here we evaluated the effects of seasonal meteorological variability on the behaviour of Talitrus saltator on Berkoukesh beach (N-W Tunisia). The site is characterised by a Mediterranean climate, but is particularly exposed to seasonal winds and storms. The shoreline is in morphodynamic equilibrium. We tested sandhopper Talitrus saltator orientation in April, when sudden rainfall and storms are common, and in June, when as a rule the weather is warm and dry. The results were analysed with circular statistics and multiple regression models adapted to angular distributions, in order to highlight differences in orientation under the various conditions. Depending on the environmental conditions, amphipods from the same population appeared to utilise various orientation strategies as a response to different environmental constraints. The use of a range of behavioural mechanisms (sun-orientation seaward, sun-orientation landward, and phototaxis) resulted in links to the local landscape and to the animals’ life cycle. As a general conclusion, we can infer that the behavioural variability found within the same population represents a response to seasonal environmental fluctuation. Such an increase in variability is likely to develop on a beach in dynamic equilibrium, where landscape references are stable, and a variable behaviour represents a strategy for dealing with environmental fluctuations.     

Abundance,distribution, and feeding patterns of juvenile coho salmon (Oncorhynchus kisutch) in the Juan de Fuca Eddy

The Juan de Fuca Eddy is a seasonal, counter-clockwise gyre off the mouth of the Strait of Juan de Fuca between Washington, USA and British Columbia, Canada that may provide favorable feeding habitat for juvenile coho salmon (Oncorhynchus kisutch) during their early marine existence. In late September 2002, physical and biological sampling was conducted along two transects of the eddy region. Surface rope trawling was conducted to capture juvenile salmon and other nekton, along with bongo and neuston net tows to examine potential mesozooplanktonic salmon prey. Presence of the Juan de Fuca Eddy was confirmed with vertical water profiles. In addition, nutrient and chlorophyll a concentrations collected from 3-m depth were within the range observed in previous studies within the eddy region. In the mesozooplankton community, euphausiids, chaetognaths, and decapod megalopae were common. In the diet of juvenile coho salmon, euphausiids and decapod megalopae were dominant by percent number, and larval and juvenile fish were dominant by percent weight. Feeding intensity (percent body weight) based on stomach contents was variable, but not significantly different among stations. To compare the Juan de Fuca Eddy region with an upwelling area, we sampled along a transect off La Push (LP), Washington, USA which is south of the eddy. The eddy region was found to be less productive than the LP transect. Nutrients were lower, chlorophyll a concentrations were higher, and zooplankton abundance was generally higher along the LP transect than in the eddy region. In addition, more juvenile coho salmon were captured from the LP transect than the eddy region. Prey items in stomachs of salmon from the LP transect were heterogeneous compared to those from the eddy region. Feeding intensity along the LP transect was slightly lower and more variable than in the eddy region, and differences in feeding intensity among LP stations were significant. In addition, feeding intensities among stations nested within regions were significantly different.