Green lacewing collection data from eleven various biotopes were used to typify different ecological landscapes. To make up the values recorded on single samples, we operated by the bootstrap method. A classifying process cluster scatterplot was then established to assess the proximity of the different habitats. Shannon's and Hurlbert's indices are highly sensitive parameters of the structure of assemblages. Their analysis results in a diagrammatic typological approach to the biotopes, allowing unambiguous comparisons between various chrysopid assemblages. It is possible to characterize the state of these polyvalent predators as a function of different abundance and diversity, and this state can be a standard of value of good ecological function in ecosystems. Concerning farming consultation and environmental conservation, such an approach is new and could be promising for future agricultural and landscape managers. biodiversity / green lacewing / faunistic richness / diversity index / equitability index
Green lacewings are pertinent bio-indicators of an ecosystem's health. An example for detecting temporal changes in crop field biodiversity over a short period by sampling chrysopids is given. Light-trapping collections over ten years near Bucharest (Romania) implied changes in the species assemblages. The main species present were members of the Chrysoperla carnea-complex. They increased from 38 to 72% of the total Chrysopidae in samples. The faunistic richness (Margalef's index) only decreased by about 9% of its initial value. Shannon's diversity and Hurlbert's equitability indices showed a high level of biodiversity for an agri-environment. Nevertheless, they decreased significantly by about 45% over time, attesting to a loss in biodiversity. Statistical analysis by linear and logistic regressions shows that the progressive dominance of the common green lacewings is realistic, and constitutes indication of change in crop field biodiversity. ecological modelling / Chrysoperla carnea / beneficial insect / biodiversity change / agro-ecosystem / Romania
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