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  • 1
    Online Resource
    Online Resource
    Exeter :Pelagic Publishing Ltd.,
    Keywords: PSVF. ; Zoology: amphibians & reptiles (herpetology). ; PSAF. ; Ecological science, the Biosphere. ; WNCK. ; Wildlife: reptiles & amphibians: general interest. ; . ; Electronic books.
    Description / Table of Contents: A comprehensive guide to the native and non-native species of amphibian and reptile found in the British Isles. It covers the biology, ecology, conservation and identification of the British herpetofauna, and provides keys to adults and young.
    Type of Medium: Online Resource
    Pages: 1 online resource (178 pages)
    Edition: 1st ed.
    ISBN: 9781907807480
    Series Statement: Naturalists' Handbooks Series ; v.31
    DDC: 597.60941000000003
    Language: English
    Note: Intro -- Title page -- Contents -- Foreword -- Acknowledgements -- 1 Introduction -- 1.1 Interest in amphibians and reptiles -- 1.2 Engaging with amphibians and reptiles -- 1.3 Special aids -- 1.4 Where next? -- 2 Basic biology -- 2.1 Life histories -- 2.2 Skin -- 2.3 Feeding -- 2.4 Respiration -- 2.5 Thermoregulation -- 2.6 Amphibian reproduction -- 2.7 Reptile reproduction -- 2.8 Taxonomy and evolutionary history -- 3 Ecology and conservation -- 3.1 What is a population? -- 3.2 Population dynamics -- 3.3 Population trends -- 3.4 Natural regulators of population size -- 3.5 Human regulation of amphibian and reptile population sizes -- 3.6 Community ecology -- 3.7 Conservation -- 4 Surveying andmonitoring -- 4.1 Strategy -- 4.2 Survey methods for amphibians -- Daylight searches -- Using a pond net -- Night searching -- Live-trapping -- Calls of breeding males -- Refugia -- 4.3 Survey methods for reptiles -- Daytime searching -- Artificial refugia -- 4.4 Presence/absence surveys -- Native amphibian surveys -- Native reptile surveys -- Non-native species -- 4.5 Population size surveys -- Spawn counts -- Head counting by torch at night -- Torch counting for newts -- Trap counts of newts -- Head counts -- 4.6 Using the data -- 5 Studying amphibians -- 5.1 Life in the pond: from egg to metamorph -- Factors affecting spawn mortality -- Working with tadpoles -- 5.2 Juvenile life -- Individual identification -- Dispersal -- 5.3 Studying adult amphibians -- Frog and toad breeding behaviour -- Newt breeding behaviour -- Aquatic habitat selection -- Life on land -- Migration -- Longevity -- Introduced species -- 6 Studying reptiles -- 6.1 Eggs and juveniles -- 6.2 Adult lizards -- 6.3 Adult snakes -- 6.4 General questions about reptiles -- 7 How schools can help -- 7.1 News from home -- 7.2 Field study -- 7.3 Lab study -- 7.4 Overview. , 8 Identifying species found in Britain -- 8.1 Amphibians -- Key I Adult and immature newts -- Sexing newts -- Key II Newt eggs, larvae and metamorphs -- 8.2 Frogs and toads -- Sexing frogs and toads -- Key III Frogs and toads (adults and metamorphs) -- Key IV Frog and toad spawn -- Key V Frog and toad larvae -- 8.3 Reptiles -- Sexing lizards -- Key VI Adult and hatchling limbed lizards -- 8.4 Snakes -- Sexing snakes -- Key VII Adult snakes -- 8.5 Distribution of amphibians and reptiles -- Local distributions -- 9 Working with amphibians and reptiles: some basic essentials -- 9.1 Legal niceties -- 9.2 Handling amphibians and reptiles -- 9.3 General good practice -- 9.4 Individual identification -- 9.5 Forward planning and the basics of statistical approaches -- Hypothesis testing -- 9.6 Statistical methods -- Planning the study -- Investigating variations in distribution -- Data distributions -- Comparing means -- Correlation and regression -- Survivorship studies -- Multivariate statistics -- 9.7 Publication outlets -- 9.8 Meetings -- 10 Useful addresses and links -- 10.1 Organisations -- Amphibian and reptile specialists -- Other relevant non-government organisations (NGOs) -- Statutory organisations -- Central offices for licence applications -- Equipment suppliers -- Aquaria and vivaria -- Pond and aquarium nets -- Powerful torches -- Food for captive amphibians and reptiles -- References -- Index.
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 25 (1991), S. 0 
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY 1. The presence of extracellular DNA, but not RNA, at μg 1−1 concentrations was demonstrated in seawater, river water and in a series of eutrophic lowland ponds.2. Extracellular DNA in natural waters invariably comprised two major components: one of high molecular weight (〉20 kb) derived from viruses, and another of low molecular weight (1–500 bp) and apparently free in solution. Similar species of DNA molecules were produced within 2 weeks in simple laboratory modules.3. A purification procedure was developed which separated extracellular DNA from other components of dissolved organic matter, and which also separated viral from soluble DNA. Both types of DNA were purified sufficiently to constitute active templates for enzymes used in DNA manipulation.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] There is now ample evidence of the ecological impacts of recent climate change, from polar terrestrial to tropical marine environments. The responses of both flora and fauna span an array of ecosystems and organizational hierarchies, from the species to the community levels. Despite continued ...
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 374 (1995), S. 219-220 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - Although increases in greenhouse gases are considered certain to precipitate substantial climate change over the coming decades, there is almost no information on the effect of these events on wildlife. I have made some observations on the breeding cycles of amphibians that indicate changes ...
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-1939
    Keywords: Niche separation ; Competition Specialisation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Two congeneric anurans with highly overlapping geographical ranges, Bufo bufo and B. calamita, were investigated with respect to isolating mechanisms during the terrestrial phase of life in the three habitat types in which both species occur in Britain. Marked spatial niche separations were observed in all three habitats (coastal dunes, upper saltmarshes and lowland heaths). B. bufo was associated with complex, dense vegetation structures and had a relatively wide niche, while B. calamita had a narrower niche and occurred mostly on open, poorly-vegetated ground. Food niche overlap was high at all three study sites. Animals translocated into atypical habitats returned to their preferred type whenever possible, and suffered increased mortality or loss of condition if prevented from doing so. B. calamita operated at significantly higher body temperatures (by an average of 1.4° C) than B. bufo when hunting at night. Experiments in outdoor vivaria indicated that B. calamita survived in open habitats because individuals escaped desiccation in daytime by burrowing into the substrate, whereas B. bufo lacked this behaviour and perished on the inhospitable surface. By contrast, B. calamita individuals lost mass and became hyperactive in densely-vegetated conditions because their hunting efficiency was selectively reduced relative to that of B. bufo. Taken together, the data indicated that spatial niche separation between these species during the terrestrial phase of life was dictated primarily by behavioural and physiological factors, and not by competition.
    Type of Medium: Electronic Resource
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