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<p>This paper presents an analysis of extensive collections of free-living marine and estuarine nematodes from 5 sites on sandy beaches and estuarine mudflats in south-eastern Australia, comprising of up to 90 samples collected at each site over a 40-year period. The lowest number found was 57 species in 30 samples from Clyde River Estuary, and the maximum was 112 species in 76 samples from Broulee. Random Species Accumulation Curves and Coleman Curves were constructed and the classic and unbiased Chao2 estimators calculated to predict total species richness. Both methods gave very similar results. Predicted total numbers of species were between 102 and 168 species, meaning that, despite the extensive collecting effort over many years, between 56 and 81% of the predicted total number of species had been collected. To sample 90% of the total fauna would require an estimated 84 to 171 samples, approximately 1⅓ to 3 times the numbers actually taken. To sample 99% of the total fauna would require about double the samples&#xa0;to up to 6 times the already extensive collecting effort. The global total number of nematode species implied by the predicted species numbers at these 5 sites is towards the high end of previous estimates of 0.5 to 10 million species.</p>

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Species richness of free-living nematodes in eastern Australia and what it tells us about nematode diversity and its collection

  • 期刊论文

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  • 发表日期：

    2026年6月20日

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  • Mike Hodda,
  • Manda Khudhir

摘要

This paper presents an analysis of extensive collections of free-living marine and estuarine nematodes from 5 sites on sandy beaches and estuarine mudflats in south-eastern Australia, comprising of up to 90 samples collected at each site over a 40-year period. The lowest number found was 57 species in 30 samples from Clyde River Estuary, and the maximum was 112 species in 76 samples from Broulee. Random Species Accumulation Curves and Coleman Curves were constructed and the classic and unbiased Chao2 estimators calculated to predict total species richness. Both methods gave very similar results. Predicted total numbers of species were between 102 and 168 species, meaning that, despite the extensive collecting effort over many years, between 56 and 81% of the predicted total number of species had been collected. To sample 90% of the total fauna would require an estimated 84 to 171 samples, approximately 1⅓ to 3 times the numbers actually taken. To sample 99% of the total fauna would require about double the samples to up to 6 times the already extensive collecting effort. The global total number of nematode species implied by the predicted species numbers at these 5 sites is towards the high end of previous estimates of 0.5 to 10 million species.