Role of buffer strips in management of waterway pollution: A review

A buffer strip can perform a multitude of functions, and these include channel stability, a filter for sediment and nutrients, water purification (e.g., bacteria and pathogens), a nondisturbance area, and the provision of terrestrial and stream habitat. These functions are reviewed with specific application to Australian conditions, and methods for modeling their performance are outlined. The primary focus is on the use of buffer strips to minimize waterway pollution from diffuse sources since their use is often justified on this basis. Particular attention is given to the conditions under which a buffer strip will act as an effective filter and the conditions under which it will fail. Buffer strips are most effective when the flow is shallow (nonsubmerged), slow, and enters the buffer strip uniformly along its length. Their sediment trapping performance decreases as the sediment particle size decreases. Nutrients are often preferentially attached to fine sediment. As a result, buffer strips are better filters of sediment than of nutrients. Buffer strips should only be considered as a secondary conservation practice after controlling the generation of pollutants at their source and, to be effective, buffer strips should always be carefully designed, installed, and maintained.     

The national GIS demonstrator of common lands for England and Wales

This paper describes the construction of a Geographical Information System (GIS) for common land tracts in England and Wales. In particular we highlight the problems inherent in combining data sets which have not been designed with GIS approaches in mind. The paper documents, through this case study, a number of key principles for researchers faced with developing databases of this nature and the limitations of the resulting database in the light of such concerns. In doing so, we draw attention to the types of techniques that can be developed to ensure users do not use the data in unwarranted situations and so guard against potential misuse. Such statements, it is concluded, are essential components in studies where data from several different sources are combined in a GIS environment to address rural planning issues.     

Surveys of historic parks and gardens

The United Kingdom offers some of the finest designed parks and garden landscapes in the world and, whilst there is a wide range of skills and a wealth of literature on the subject, there is little evidence of official effort to systematically record historic sites. This, it is argued, is a factor in the continuing decline of many examples. This paper records an attempt at a comprehensive examination of one county — Cheshire — begun in 1970. The method is described and the results discussed in some detail. Some suggestions are put forward for improvements to official incentives for site owners.     

MODELING HYDROLOGIC TIME SERIES FROM THE ARCTIC1

The general intervention model is applied to hydrologic and meteorologjc time series from the Canadian Arctic. The authors show how the model is able to account for environmental interventions, missing observations in the data, changes in data collection procedures, the effects of external inputs, as well as seasonality and autocorrelation. Methods for identifying transfer functions by making use of a physical understanding of the processes involved are demonstrated and sample applications of the general intervention model to Arctic data are shown.     

Effects of H2O2 on growth,metabolic activity and membrane integrity in three strains of Microcystis aeruginosa

Environmental Science and Pollution Research - The application of hydrogen peroxide (H2O2) as a management tool to control Microcystis blooms has become increasingly popular due to its short...     

Observed activation status of lane departure warning and forward collision warning of Honda vehicles at dealership service centers

Objective: There are little objective data on whether drivers with lane departure warning and forward collision warning systems actually use them, but self-report data indicate that lane departure warning may be used less and viewed less favorably than forward collision warning. The current study assessed whether the systems were turned on when drivers brought their vehicles to dealership service stations and whether the observational protocol is a feasible method for collecting similar data on various manufacturers' systems.

Methods: Observations of 2013–2015 Honda Accords, 2014–2015 Odysseys, and 2015 CR-Vs occurred at 2 U.S. Honda dealerships for approximately 4 weeks during Summer 2015.

Results: Of the 265 vehicles observed to have the 2 systems, 87 (32.8%) had lane departure warning turned on. Accords were associated with a 66% increase in the likelihood that lane departure warning was turned on compared with Odysseys, but the rate was still only about 40% in Accords. In contrast, forward collision warning was turned on in all but one of the observed vehicles.

Conclusions: Observations found that the activation rate was much higher for forward collision warning than lane departure warning. The observation method worked well and appears feasible for extending to other manufacturers.     

Effects of Information on the Social Acceptability of Alternatives to Clearfelling in Australian Wet Eucalypt Forests

The effects of viewing different types of information were investigated in people judging the social acceptability of alternative forest harvest systems. Approximately 500 Tasmanians were shown still-simulated images of four harvest systems (a clearfell system, two aggregated retention systems, and a selective system) and were asked to judge their acceptability. Individual interviews were conducted with 12 of the participants. It was anticipated that people holding different beliefs about the consequences of harvesting would have different responses to information. Cluster analysis was used to group participants according to these beliefs. Responses to still images were compared with responses to two other types of information: information about consequences of the harvest systems in the form of indicator symbols, and information about regeneration over time, presented as visual animations. The effects of information differed across both harvest system and belief cluster groups of participants. The largest effects of information occurred in people who held a mix of beliefs about consequences. Within this group, participants who viewed the indicators rated a 30% aggregated retention system higher and selective harvesting lower, than those who did not view the indicators. Viewing animated sequences led to slightly higher ratings of the more intensive harvest systems and significantly lower ratings of the selective harvest system than those based on the still images. The interview data provided examples of interviewees viewing information critically against their own values and beliefs. Only some interviewees appeared to use it in judging social acceptability     

塔基图穆保护区——库克群岛的社区所属生态旅游明星

塔基图穆保护区 1996年创建于库克群岛的拉罗汤加岛 , 其目标是为了当前和未来生产者的利 益而对生物多样性实施保护 . 只有当地人民对其土地和资源拥有所有权 . 生态旅游将成为该 保护区的主要经济活动 . 在土地所有者同意和支持下 , 一个有指导的 “ 大自然漫步 “ 已经组 织起来 .     

Age,experience, and enemy recognition by wild song sparrows

Summary Older female Song Sparrows (Melospiza melodia) breeding on Mandarte Island, B.C., Canada, are more often parasitized by a brood parasite, the Brown-headed Cowbird (Molothrus ater), than yearling females breeding for the first time. This may be explained if older Song Sparrows behave differently than yearlings towards searching female cowbirds, and are thus more readily recognized as potential hosts. We tested this hypothesis by measuring the responses of Song Sparrows to a stuffed mount of a female cowbird in 1982, when no cowbirds frequented the island. This mount, and a control (a female junco) were presented near the nests of wild female sparrows of known age. As predicted, adult female sparrows behaved differently towards the cowbird model from yearlings (Table 1). They did not differ in their responses to the junco. Adult males also responded differently to the cowbird and junco (Table 2), but adult males did not differ significantly from yearlings in their response to either model. When birds that responded weakly as yearlings in the absence of cowbirds were retested as 2-year-olds after the recolonization of the island by cowbirds, they responded strongly to cowbird models. Two-year-old birds not exposed to cowbirds as yearlings, were parasitized at a rate intermediate between the rate for experienced adults and that for yearlings. Yearling females were parasitized less often at the beginning of the period of breeding activity by cowbirds than at the end. All these results are consistent with our hypothesis that age-selective parasitism results from differences among age classes in the mobbing responses of Song Sparrows to cowbirds. The greater response of adult sparrows to cowbirds seems non-adaptive, because it apparently results in a loss of reproductive output through selective parasitism. We suggest that this paradox can be resolved if the response to cowbirds near the nest is an instance of a more general acquired response to all potential enemies that approach a nest.