File Name: the net and the butterfly .zip
Insect collecting refers to the collection of insects and other arthropods for scientific study or as a hobby. Because most insects are small and the majority cannot be identified without the examination of minute morphological characters, entomologists often make and maintain insect collections.
- The Net And The Butterfly
- The impact of urban development on butterflies within a city region
- Insect collecting
The effect of urban development on butterfly species' richness and species' incidence is tested for the Greater Manchester conurbation and two sample areas, mapped at finer scales, within the southern part of the conurbation. The tests include measures of bias for recording effort number of visits. Species' richness is found to increase with percentage urban cover for Greater Manchester tetrad scale and decrease with urban cover for the two sample areas in South West Manchester 1 km scale and the Mersey Valley m scale. For Greater Manchester, the increase in species' richness with increased urban cover is largely explained by lower species' richness at higher altitude in the Pennines bounding the conurbation. For the two sample areas, decreasing species' richness associated with increasing urban cover corresponds with reductions in the areas of a number of semi-natural habitats, hostplants and nectar sources.
The Net And The Butterfly
Data from the Greater Manchester Butterfly Atlas UK reveal a highly significant and substantial impact of visits on both species' richness and species' incidence in squares. This effect has been demonstrated for three different zones mapped at different scales. The significant impact of number of visits persists when data are amalgamated for coarser scales. The findings demonstrate that it is essential for distribution mapping projects to record data on recording effort as well as on the target organisms. Suggestions are made as to how distribution mapping may be improved, including a geographically and environmentally representative structure of permanently monitored squares and closer links between distribution mapping and the Butterfly Monitoring Scheme BMS , which primarily monitors changes in butterfly populations. The benefit to conservation will be data that can be better used to analyse the reasons for changes in ranges and distributions, fundamental for determining priorities and policy decisions. This is a preview of subscription content, access via your institution.
Over several decades and in many countries, butterflies have been monitored regularly and has produced many insights to support their conservation. Transect counts are the main method used in the European Butterfly Monitoring Schemes. In this Manual you will find useful information about monitoring butterflies with the transects including: how to select a place to monitor, where to setup your transect route, which simple rules to follow for a transect visit and how to submit your records. Do you need to start from the beginning? What is the difference between butterflies and moths?
The impact of urban development on butterflies within a city region
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