A quantitative technique for sampling motile macroinvertebrates in beds of the seagrass Posidonia oceanica (L.) Delile

A quantitative technique for sampling motile macroinvertebrates in beds of the seagrass Posidonia oceanica (L.) Delile

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Techniques for sampling motile macroinvertebrates associated with Posidonia oceanica seagrass meadows have mainly involved the use of hand-nets and suction samplers or collection by hand.These techniques give unreliable quantitative estimates or domeless quartz nails have practical difficulties.A large cylindrical saw-rimmed corer was designed and used successfully to obtain quantitative samples of macroinvertebrates from both foliage and root-rhizome matrix of a Posidonia oceanica meadow in Malta (central Mediterranean).Choice of the appropriate sample unit size was assessed by comparing the relative accuracy, precision and efficiency of three different core diameters: 25 cm, 35 cm and 45 cm.The results suggest that for comparison of macrofaunal species richness and abundance between different meadows/sites the 25 cm diameter corer is recommended.

For surveys aimed at groth cabernet sauvignon 2017 estimating total diversity within a particular site, the 35 cm diameter corer is more appropriate.