Gonzaga Debate Institute 2011 Gemini Landsats Neg


AT: Bio-D – No Solve – Landsat Low Res



Download 0.58 Mb.
Page6/49
Date18.10.2016
Size0.58 Mb.
#1090
1   2   3   4   5   6   7   8   9   ...   49

AT: Bio-D – No Solve – Landsat Low Res


Landsat fails – not high enough resolution
Olson et al 2 (David M., Eric Dinerstein, George V. N. Powell, and Er D. Wikramanayake, Conservation Science Program, World Wildlife Fund, Conservation Biology, p. 1-3, Vol. 16, No. 1, Feb, EBSCO, JMB)

A priority area of research for ecologists is the assessment and monitoring of biodiversity. This is especially essential in tropical habitats where much of the world’s species diversity is concentrated (Nagendra and Gadgil 1999; Sanchez-Azofeifa et al. 2003; Loarie et al. 2007). With accelerated declines in tropical forest clearing and biodiversity across the world, there is an urgent need to identify the locations of biodiversity hotspots, map the distribution of biodiversity across different habitats and landscapes, and monitor rates of change over time. What is the potential of hyperspatial and hyperspectral data for this purpose? Remote sensing has long been used to predict species rich sites based on both environmental heterogeneity as derived by spectral heterogeneity (Palmer et al. 2002; Foody and Cutler 2003; Rocchini et al. 2004; Hernández-Stefanoni and Dupny 2007) and Net Primary Productivity (NPP) as derived from vegetation indices such as NDVI (Fairbanks and McGwire 2004; Gillespie 2006). While some success has been achieved, obviously, no single factor such as landscape heterogeneity, or primary productivity, drives biodiversity patterns (Turner et al. 2003). Instead, species are clustered based on some exogenous factors, such as climate and soil type. Such clustering or autocorrelation of species distributions is often at broad scales, facilitating the use of medium-coarse resolution imagery for species diversity estimations (Dormann 2007). Other biotic and abiotic processes may however cause further structuring within smaller areas of relative environmental homogeneity, giving rise to small scale niche patterning, and fine scale variations in biodiversity (Legendre 1993; Wagner 2003). In such cases, there is an apparent need for hyperspatial data. When medium pixel resolutions, a few tens of meters in size, are used for ecological studies, then a single pixel often encompasses a number of individual trees or plants, sometimes even crossing habitat boundaries (Small 2004). Thus each pixel corresponds to a mixed field signature averaged across multiple objects, leading to difficulties in identification of species identity, or the mapping of fine scale variations in biodiversity. Hyperspatial satellite imagery is potentially much better suited for biodiversity mapping with pixel sizes of the size of 5 m or less corresponding well to the size of individual tree crowns (Read et al. 2003; Wulder et al. 2004). Figure 1 illustrates the potential of hyperspatial data for biodiversity studies. In this subtropical landscape in the Nepal Terai plains, the Rapti River separates the Chitwan National Park in the south from a mix of agricultural landscapes and human impacted forests to the north (Nagendra et al. 2008). Even a visual comparison of a Landsat ETM+ image of this landscape (Fig. 1a) with an IKONOS image of a nearby date (Fig. 1b) indicates that the IKONOS image is capable of detecting heterogeneity at a much finer scale that can be observed by the ETM+ image. The ecological impact of small streams and rivulets on biodiversity, and the human impact through roads, mud tracks and the nearby agricultural fields, which can be seen to an extent in the medium resolution Landsat image, is far more clearly discernible from the hyperspatial IKONOS image. A quantitative analysis of the data supports this (Nagendra, unpublished results).


AT: Bio-D – No Solve – Resources


Can’t solve bio-d now – conservationism doesn’t have enough resources
Miller 5 (James R., Dept. of Natural Resource Ecology and Management and Department of Landscape Architecture, Iowa State U, TRENDS in Ecology and Evolution Vol.20 No.8 August, p. 430-434, http://millerlab.nres.uiuc.edu/pdfs/Biodiversity%20Conservation%20and%20the%20Extinction%20of%20Experience.pdf, accessed 7-7-11, JMB)

The magnitude of the current extinction crisis is widely appreciated in the scientific community, particularly among ecologists. The erosion of biodiversity is documented and potential strategies to reverse this trend are detailed in an ever-increasing number of journals and at the annual meetings of numerous professional societies. However, the wherewithal to reverse the degradation of our natural heritage in a meaningful way is still lacking. One reason for this is that conservationists have failed to convey the importance, wonder and relevance of biodiversity to the general public, preaching to the choir rather than reaching the unconverted [1,2]. This failure stems, in part, from the assumption that an ‘educate-the-public’ approach will be sufficient to motivate change [3]. Rather than fostering support for conservation, some forms of ‘education’ might have the opposite effect. Entrepreneur, environmentalist and author Paul Hawken observes that endlessly repeating the calculus of biotic impoverishment and the litany of environmental wrongs might eventually take on the ring of a ‘the sky is falling’ admonition, making the listener feel helpless or incredulous [4]. However compelling the evidence might appear to be, Hawken notes that fear of a future characterized by environmental degradation has rarely been an effective motivator [4]. Failure to engender broad-based support might also be a function of the estrangement of people from nature. This possibility was driven home to me by an Australian radio report of the results of a survey of primary school children in Perth, many of whom were apparently unaware that milk is produced by cows and that the cotton in their clothes comes from plants. There are, of course, similar examples from other countries. In the USA, for instance, high-school students in Harris County, Texas, were given a multiple-choice test that comprised scaled black-line drawings of mammals that were either extant or historically present in the region, as well as basic questions regarding their natural history [5]. Results revealed that many students could not correctly identify common mammals with local distributions, incorrectly designated common species as extinct or never having existed in the area, and were generally ignorant about the relationship among urbanization, habitat loss and species declines [5]. The line that separates that which is deemed relevant by the public from that which is not is brought into sharp focus by the assertion that most Americans can identify hundreds of corporate logos, but fewer than ten native plant species [4], and that adolescents in south-central Los Angeles are more likely to identify correctly an automatic weapon by its report than they are a bird by its call [6]





Download 0.58 Mb.

Share with your friends:
1   2   3   4   5   6   7   8   9   ...   49




The database is protected by copyright ©ininet.org 2024
send message

    Main page