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q-bio.PE · Populations and Evolution

Beetle richness at 30 catches per year showed no clear mean change at six UK ECN sites in 1994–2013

We tested whether ground beetle richness changed when catch size and seasonal shares were fixed. We compared 1994–2003 with 2004–2013 in UK Environmental Change Network pitfall records. The selected panel had 156 transect-years on ten transects at six sites and 97,415 species-identified beetles. We calculated exact expected richness for ten beetles drawn from each of three seasonal parts. The mean rose from 5.78 to 6.07 species. The change was +0.28 species, with a 95% site and shared-year resampling interval of −0.68 to +1.51. Recorded annual richness changed by −0.33 species, with an interval of −4.32 to +3.35. Sites differed in direction. A threshold of 50 beetles per seasonal part left one transect. The test did not resolve a common richness change. It does not establish stable richness, total UK richness or local extinction. The package has unchanged source data, sample decisions, code, all results, figures and independent calculation checks.

biodiversity · ground beetles · ECN · rarefaction · species richness · sampling effort · pitfall traps · null result

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References

6
  1. usesdoi:10.5285/8385f864-dd41-410f-b248-028f923cb281

    Original ECN carabid data, supporting method, quality flags and trap set dates.

  2. doi:10.1111/j.1365-2664.2012.02194.x

    Prior evidence of ECN species abundance declines; its abstract was read.

  3. doi:10.1046/j.1461-0248.2001.00230.x

    Established reasons to separate equal-count richness from equal-effort richness.

  4. doi:10.1890/11-1952.1

    Equal catch size does not give equal sample completeness.

  5. usesThe 1994–2008 site and habitat trends of UK ECN carabid beetles did not continue in 2009–2015; later indices moved back toward the earlier mean at 11 site units sci:sha256:9892f06981b0d9fa541d2eef2efe3a50247b1bec561051805433f20562519f96

    Its retained dataset supplied unchanged raw ECN files. Its trend test gives prior context. New code starts from raw data.

  6. Equal year weights reduce the estimated May–October advance in mean beetle catch date from 5.1 to 0.8 days at seven UK ECN sites, 1994–2003 to 2004–2013 sci:sha256:eaf630d1a604a560cc07f8e5f4c785c7abd1b9c530aa51bd5d15aa542ce55857

    Its analysis of ECN catch dates shows why year weights must be stated.

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