低压离子色谱法测定水和酸雨样品中的Li^＋,Na^＋,NH^＋4,K^＋,Ca^2和Mg…

本文介绍了离子色谱仪测定水样和酸雨中锂，钠，铵，钙，钾入镁离子的方法，欲测阳 了和阳离子交换柱上被分离，分别用１．４ｍｍｏｌ．ｌ＾－１ＨＮＯ３和０．６ｍｍｏｌ．ｌ＾－１乙二胺＋１．２ｍｍｏｌ．ｌ＾－１ＨＮＯ３溶液作流动相，流速为１．６ｍｌ．ｍｉｎ＾－１。     

离子色谱法测定饮用水和面包中的溴酸根

选用ＡＳ９－ＨＣ高容量阴离子交换色谱柱,不需处理除去干扰离子,可直接进样。测定了两种水样,其中一种检出溴酸根,方法检出根０．００５ｍｇ．１＾－１水样加标回收率９１．３－９３．４％。采用全新的自动化样品处理技术－加速溶剂萃取萃取面包中的溴酸根。经ＡＳ９－ＳＣ阴离子交换色谱柱分离,选择最佳淋洗条件。电导检测,方法检 ０．０７ｍｇ．１＾－１,对十二种市售包进行测定,均未检出溴酸根,样品加标回收率７９．９     

雨水中S（Ⅳ）的离子色谱分析及其保护方法的研究

本文研究了用离子色谱法分析雨水中Ｓ（Ⅳ）的色谱条件和含Ｓ（Ⅳ）样品的保存方法，采用ＨＰＩＣ＿ＡＳＡ分离柱、用２ｍｍｏｌ．ｌ＾－１Ｎａ２ＣＯ３／３ｍｍｏｌ．ｌ＾０１ＮａＯＨ溶液作淋洗液、０．０１２５ｍｏｌ．ｌ＾－１Ｈ２ＳＯ４为再生液、电导检测的方法，具有无干扰和灵敏度高等优点，而且在Ｓ（Ⅵ）的浓度秋－２８μｇ．ｍｌ＾－１范围内，其浓度与响应值之间呈现出良好的线性关系，其线性相关系数在０．９９９５以上     

低压离子色谱法测定水和酸雨样品中F^—,Cl^—,NO^—3,SO^2—4离子

本文介绍了低压离子色谱法测定水样和酸雨中氟，氯，硝酸根，硫酸根离子的方法，欲测阴离子在阴离子交换柱上被分离，同时用１．２ｍｏｌ．ｌ＾－１Ｎａ２ＣＯ３溶液作流动相，流速为１．６ｍｌ．ｍｉｎ＾－１。各离子的流分用电导检测。     

铬（Ⅲ）和铬（Ⅵ）的离子色谱分析

本文对水样中Ｃｄｒ和Ｃｒ的离子色谱分析结果表明：Ｃｒ经柱前衍生，与ＣＣｒｔＯ＾２－４状态存在的Ｃｒ在阴离子交换柱上分离，用光度法检测。Ｃｒ和Ｃｒ以最低检出限分别为３０μｇ．ｌ＾－１和１μｇ．ｌ＾－１，常见阴，阳离子不干扰。     

1硝基芘与苯衍生物共存对斜生栅藻的联合毒性

本文研究了１－硝基芘和硝基苯,苯酚、苯胺,甲苯四种苯的衍生物对斜生栅藻生长抑制的ＥＣ５０分别为０．１８２４ｍｇ．ｌ＾－１,３６．５１６４ｍｇ．ｌ＾－１,２１９．００２７ｍｇ．ｌ＾－１,４５．１６８９ｍｇ．ｌ＾－１ｔ ７２．３１７２ｍｇ．１＾－１。     

离子色谱法电化学检测复合甜味剂和饮料中的甜味素

提出了一种以离子色谱法分离,积分安培法检测复合甜味剂和饮料中甜味素的新方法。以ＤｉｏｎｅｘＡＳ４Ａ－ＳＣ柱为分离柱,２７．５ｍｍｏｌ．ｌ＾－１ＮａＯＨ为淋洗液等度淋洗,积分安培电化学检测。     

土壤和植物中硼酸的离子排斥色谱法分析研究

本文研究了用酒石酸－甘露醇作淋洗液，氢氧化钠作再生液测定土壤和植物中硼酸的离子排斥色谱条件。硼酸的检测限为０．０５ｍｇ／ｌ相对标准偏差１．８５％，样品测定回收率为１００±１０％。     

多聚磷酸盐的离子色谱法分析研究

本文以美国ＤＩＯＮＥＸ公司Ｏｍｎｉ Ｐａｃ ＰＡＸ－１００为分离柱，氢氧化钠为淋洗液，甲醇为有机改进剂，梯度淋洗分离多聚磷酸盐（正磷酸盐ＰＯ＾３－４，焦磷酸盐Ｐ２Ｏ＾４－７，三聚磷酸盐Ｐ３Ｏ＾５－１０）。研究了分离机理和流动相的选择、色谱条件的最佳化、降低基线噪音的方法和多聚磷酸盐的稳定性。建立了同时测定ｐｐｂ级（μｇ／ｌ）多聚磷酸盐的离子色谱新方法。对样品的测定结果回收率均在９７．４９％—１０６     

水样品中重碳酸根离子排斥色谱法研究

本文研究了用离子排斥色谱法分析了水样品中重碳酸根的最佳色谱条件，分离方式和流动相的选择，样品溶液ｐＨ值与峰高的关系，实验结果显示，该方法具有简便，用样量少，灵敏度高于和干扰少等优点，测量下限为０．１２μｇ．ｍｌ＾－１ＨＣＯ＾－３在１－１０μｇ．ｍ＾－１和１０－１００μｇ．ｍｌ＾－１浓度范围内，ＨＣＯ３浓度与峰高的线性相关系数在０．９９５以上，该方法用于自来水和油田水样品的分析获得较好的结果。     

Achieving Open Access to Conservation Science

Conservation science is a crisis discipline in which the results of scientific enquiry must be made available quickly to those implementing management. We assessed the extent to which scientific research published since the year 2000 in 20 conservation science journals is publicly available. Of the 19,207 papers published, 1,667 (8.68%) are freely downloadable from an official repository. Moreover, only 938 papers (4.88%) meet the standard definition of open access in which material can be freely reused providing attribution to the authors is given. This compares poorly with a comparable set of 20 evolutionary biology journals, where 31.93% of papers are freely downloadable and 7.49% are open access. Seventeen of the 20 conservation journals offer an open access option, but fewer than 5% of the papers are available through open access. The cost of accessing the full body of conservation science runs into tens of thousands of dollars per year for institutional subscribers, and many conservation practitioners cannot access pay‐per‐view science through their workplace. However, important initiatives such as Research4Life are making science available to organizations in developing countries. We urge authors of conservation science to pay for open access on a per‐article basis or to choose publication in open access journals, taking care to ensure the license allows reuse for any purpose providing attribution is given. Currently, it would cost $51 million to make all conservation science published since 2000 freely available by paying the open access fees currently levied to authors. Publishers of conservation journals might consider more cost effective models for open access and conservation‐oriented organizations running journals could consider a broader range of options for open access to nonmembers such as sponsorship of open access via membership fees. Obtención de Acceso Abierto a la Ciencia de la Conservación     

Rapid,recurring, structured survey versus bioblitz for generating biodiversity data and analysis with a multispecies abundance model

A bioblitz inexpensively and quickly generates biodiversity data, but bioblitzes are often conducted with haphazard, unreplicated sampling. Results tend to be taxonomically, geographically, or temporally biased, lack metadata, and consist of lists of observed taxa that do not enable further analyses or correction for imperfect detection. A rapid, recurring, structured survey (RRSS) uses a structured sampling design and temporal and spatial replication to survey randomly selected sites on a conservation property. We participated in a loosely structured bioblitz and a subsequent RRSS at Big Canoe Creek Nature Preserve in Springville (St. Clair County), Alabama (USA) to compare observed richness derived from the 2 survey approaches. The RRSS data structure enabled us to fit models that accounted for imperfect detection to estimate abundances, occupancy probabilities, and habitat associations. The loosely structured bioblitz data could not be used in such models. We present a new integrated multispecies abundance model that we applied to avian RRSS data. Our model extension enables estimation for the community, employs data augmentation to estimate the number of undetected species, and incorporates covariates. The RRSS generated a more comprehensive and less biased list of observed taxonomic richness than the loosely structured bioblitz (e.g., 73 vs. 45 bird species and 104 vs. 63 insect families from the RRSS vs. loosely structured bioblitz, respectively). Models fit to the RRSS data identified seasonal patterns in avian community composition and allowed for estimation of habitat–occupancy relationships for insect taxa. The RRSS protocol has potential for broad transferability as a standardized, quick, and inexpensive way to inventory biodiversity and estimate ecological parameters while providing an outreach opportunity.     

Compliance with and ecosystem function of biodiversity offsets in North American and European freshwaters

Land-use change via human development is a major driver of biodiversity loss. To reduce these impacts, billions of dollars are spent on biodiversity offsets. However, studies evaluating offset project effectiveness that examine components such as the overall compliance and function of projects remain rare. We reviewed 577 offsetting projects in freshwater ecosystems that included the metrics project size, type of aquatic system (e.g., wetland and creek), offsetting measure (e.g., enhancement, restoration, and creation), and an assessment of the projects’ compliance and functional success. Project information was obtained from scientific and government databases and gray literature. Despite considerable investment in offsetting projects, crucial problems persisted. Although compliance and function were related to each other, a high level of compliance did not guarantee a high degree of function. However, large projects relative to area had better function than small projects. Function improved when projects targeted productivity or specific ecosystem features and when multiple complementary management targets were in place. Restorative measures were more likely to achieve targets than creating entirely new ecosystems. Altogether the relationships we found highlight specific ecological processes that may help improve offsetting outcomes.     

Some polyphagous Homoptera gain protection from their natural enemies by feeding on the toxic plantsSpartium junceum andErythrina corallodendrum (Leguminosae)

Summary Interactions were studied among alkaloid-containing legumes (Erythrina corallodendrum andSpartium junceum) and non-toxic plants (Citrus sinensis, Cucurbita moschata andEuphorbia tirucalli), several polyphagous homopterans,Aphis craccivora (Aphididae),Icerya purchasi, I. aegyptiaca (Margarodidae),Lepidosaphes ulmi (Diaspididae) andPlanococcus citri (Pseudococcidae), and some major natural enemies of these homopterans. Significant reductions in survival due to negative effects of alkaloid containing as compared with non-alkaloidal plants were recorded for the predatorsRodolia cardinalis andChilocorus bipustulatus, but not forCryptolaemus montrouzieri (Coleoptera: Coccinellidae),Chrysoperla carnea (Neuroptera: Chrysopidae) andSympherobius sanctus (Neuroptera: Sympherobiidae). The development time of the larvae or pupae ofR. cardinalis, C. carnea andS. sanctus was longer on the toxic plants than on the non-toxic ones. The percentage of parasitism ofA. craccivora collected from the non-alkaloidal plantsVicia palaestina andMelilotus albus was much higher than that onS. junceum. The parasitoid complexes ofA. craccivora differed between both plant groups. The nutritive value of honeydew ofI. purchasi andA. craccivora, as expressed by the life span ofEncyrtus infelix (Hymenoptera: Encyrtidae) adults, was also investigated. Life spans were significantly longer when the wasps fed on honeydew produced on non-alkaloidal plants (C. sinensis andPittosporum tobira) than on alkaloid containing plants whenI. purchasi — but notA. craccivora — was the producer. It is suggested that the chemical defense ofE. corallodendrum andS. junceum is exploited by polyphagous phytophages to reduce predation. In nature, population growth and density of four of the investigated homopterans are conspicuously high when they developed on the alkaloid containing plant species, and very low on non-alkaloid plants. The efficiency of their natural enemies may be reduced by sequestration of alkaloids (or other toxic plant compounds) or their transfer into excreted honeydew. Therefore it is assumed that a generalist phytophagous homopteran may be protected from its natural enemies, although at different rates of efficiency, if it can safely sequester the host allelochemical when it develops on toxic species within its host range.     

A palaeo-hydrogeological model for arsenic contamination in southern and south-east Asia

An argument is presented in which areas of natural arsenic contamination of modern groundwaters throughout Asia have a common origin. Arsenic originally accumulated in oceanic ferro-manganoan sediments of the eastern Palaeo-Tethys. This was further concentrated through oceanic crustal extinction in what later became the south-east Chinese accreted mineralised terrain. Proto-Himalayan uplift of this area created the palaeo-drainage systems of the Ganges – Brahmaputra, Irrawaddy, Mekong, and Red Rivers, with consequent headwater erosion of arsenic-rich sediments. Their downstream deposition as immature and easily redistributed Neogene sandstones, silts, and iron-rich clays has created secondary and tertiary reservoirs of adsorbed and authigenic arsenic, from which the current arsenic-rich groundwaters have evolved. Considering river basins within the above palaeo-hydrogeological framework provides a basis for assessing the risk of arsenic in groundwater basins of south and south-eastern Asia.     

Sequestration of cucurbitacin analogs by New and Old World chrysomelid leaf beetles in the tribe Luperini

Summary Two South American polyphagous leaf beetles,Diabrotica speciosa andCerotoma arcuata, selectively accumulated the bitter tasting compound 23,24-dihydrocucurbitacin D in their body after ingesting root tissues of cucurbit plants. Similarly, three Asian Cucurbitaceae-feeding specialists in the genusAulacophora were found to sequester the same compound. Cucurbitacin analogs were shown to deter feeding by a bird predator, indicating an allomonal role for these compounds in cucurbitacin-associated chrysomelid leaf beetles both of New and Old Worlds. The strong affinity to cucurbitacins, selective sequestration of the analogs and consequent protection from predators suggested an ecological adaptation mechanism developed in common among these two geographically isolated subtribes in the Luperini.     

Threats to intact tropical peatlands and opportunities for their conservation

Large, intact areas of tropical peatland are highly threatened at a global scale by the expansion of commercial agriculture and other forms of economic development. Conserving peatlands on a landscape scale, with their hydrology intact, is of international conservation importance to preserve their distinctive biodiversity and ecosystem services and maintain their resilience to future environmental change. We explored threats to and opportunities for conserving remaining intact tropical peatlands; thus, we excluded peatlands of Indonesia and Malaysia, where extensive deforestation, drainage, and conversion to plantations means conservation in this region can protect only small fragments of the original ecosystem. We focused on a case study, the Pastaza‐Marañón Foreland Basin (PMFB) in Peru, which is among the largest known intact tropical peatland landscapes in the world and is representative of peatland vulnerability. Maintenance of the hydrological conditions critical for carbon storage and ecosystem function of peatlands is, in the PMFB, primarily threatened by expansion of commercial agriculture linked to new transport infrastructure that is facilitating access to remote areas. There remain opportunities in the PMFB and elsewhere to develop alternative, more sustainable land‐use practices. Although some of the peatlands in the PMFB fall within existing legally protected areas, this protection does not include the most carbon‐dense (domed pole forest) areas. New carbon‐based conservation instruments (e.g., REDD+, Green Climate Fund), developing markets for sustainable peatland products, transferring land title to local communities, and expanding protected areas offer pathways to increased protection for intact tropical peatlands in Amazonia and elsewhere, such as those in New Guinea and Central Africa which remain, for the moment, broadly beyond the frontier of commercial development.     

Effects of Controlled Fire and Livestock Grazing on Bird Communities in East African Savannas

Abstract: In East Africa fire and grazing by wild and domestic ungulates maintain savannas, and pastoralists historically set fires and herded livestock through the use of temporary corrals called bomas. In recent decades traditional pastoral practices have declined, and this may be affecting biodiversity. We investigated the effects of prescribed fires and bomas on savanna bird communities in East Africa during the first and second dry seasons of the year (respectively before and after the rains that mark the onset of breeding for most birds). We compared abundance, richness, and community composition on 9‐ha burned plots, recently abandoned bomas, and control plots in the undisturbed matrix habitat over a 3‐year period. Generally, recently burned areas and abandoned bomas attracted greater densities of birds and had different community assemblages than the surrounding matrix. The effects of disturbances were influenced by interactions between primary productivity, represented by the normalized difference vegetation index, and time. Bird densities were highest and a greater proportion of species was observed on burned plots in the months following the fires. Drought conditions equalized bird densities across treatments within 1 year, and individuals from a greater proportion of species were more commonly observed on abandoned bomas. Yearly fluctuations in abundance were less pronounced on bomas than on burns, which indicate that although fire may benefit birds in the short term, bomas may have a more‐lasting positive effect and provide resources during droughts. Several Palearctic migrants were attracted to burned plots regardless of rainfall, which indicates continued fire suppression may threaten their already‐declining populations. Most notably, the paucity of birds observed on the controls suggests that the current structure of the matrix developed as a result of fire suppression. Traditional pastoralism appears critical to the maintenance of avian diversity in these savannas.     

Cost‐effective conservation of an endangered frog under uncertainty

How should managers choose among conservation options when resources are scarce and there is uncertainty regarding the effectiveness of actions? Well‐developed tools exist for prioritizing areas for one‐time and binary actions (e.g., protect vs. not protect), but methods for prioritizing incremental or ongoing actions (such as habitat creation and maintenance) remain uncommon. We devised an approach that combines metapopulation viability and cost‐effectiveness analyses to select among alternative conservation actions while accounting for uncertainty. In our study, cost‐effectiveness is the ratio between the benefit of an action and its economic cost, where benefit is the change in metapopulation viability. We applied the approach to the case of the endangered growling grass frog (Litoria raniformis), which is threatened by urban development. We extended a Bayesian model to predict metapopulation viability under 9 urbanization and management scenarios and incorporated the full probability distribution of possible outcomes for each scenario into the cost‐effectiveness analysis. This allowed us to discern between cost‐effective alternatives that were robust to uncertainty and those with a relatively high risk of failure. We found a relatively high risk of extinction following urbanization if the only action was reservation of core habitat; habitat creation actions performed better than enhancement actions; and cost‐effectiveness ranking changed depending on the consideration of uncertainty. Our results suggest that creation and maintenance of wetlands dedicated to L. raniformis is the only cost‐effective action likely to result in a sufficiently low risk of extinction. To our knowledge we are the first study to use Bayesian metapopulation viability analysis to explicitly incorporate parametric and demographic uncertainty into a cost‐effective evaluation of conservation actions. The approach offers guidance to decision makers aiming to achieve cost‐effective conservation under uncertainty.