Fieldwork
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A virtual pond dip
Identification of microscopic pond life with links to further information
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Biological monitoring of freshwaters
Information on stream invertebrates
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Ecological sampling
Lots of information and examples on ecological sampling techniques
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Ecology Practical Measuring Abundance
From SAPS site, information on quadrats, random sampling etc.
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Estimating population size
Interactive exercise for mark release recapture.
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iNaturalist
Website and app which allow you to connect to a community of naturalists, very useful if you find an organism you cannot identify, take a photo on your phone, upload it, and someone knowledgeable will help you to identify it.