Energetics and consumption rates of alpine grasshoppers (Orthoptera: Acrididae) in New Zealand
Tóm tắt
An energy budget, based entirely on field data, has been constructed for a community of three New Zealand alpine grasshopper species, Paprides nitidus Hutton, Sigaus australis (Hutton) and Brachaspis nivalis (Hutton) (Acrididae). The consumption results are compared with a previous gravimetric ingestion rate study of the same field populations. Jointly, the two studies demonstrate some very specific adaptations between grasshopper energetics and feeding behaviour. Several features of the present study are:
It is concluded from survey data that New Zealand alpine grasshoppers are rarely likely to consume more than 6% of annual primary production, and that in the majority of grasslands, their consumption is unlikely to exceed 1–2%. However, percent consumption is shown to be an inadequate measure of their impact on grasslands.
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