Independent statistical validation of the New Zealand Seafloor Community Classification

The New Zealand Seafloor Community Classification (NZSCC) is a national‐scale numerical community classification which depicts compositional turnover of 1716 taxa (demersal fish, reef fish, benthic invertebrates and macroalgae) classified into 75 groups representing seafloor communities. To ensure t...

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Veröffentlicht in:Aquatic conservation 2024-03, Vol.34 (3), p.n/a
Hauptverfasser: Stephenson, Fabrice, Tablada, Jordi, Rowden, Ashley A., Bulmer, Richard, Bowden, David A., Geange, Shane W.
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container_issue 3
container_start_page
container_title Aquatic conservation
container_volume 34
creator Stephenson, Fabrice
Tablada, Jordi
Rowden, Ashley A.
Bulmer, Richard
Bowden, David A.
Geange, Shane W.
description The New Zealand Seafloor Community Classification (NZSCC) is a national‐scale numerical community classification which depicts compositional turnover of 1716 taxa (demersal fish, reef fish, benthic invertebrates and macroalgae) classified into 75 groups representing seafloor communities. To ensure the continual use of the NZSCC for spatial planning and reporting, a robust maintenance framework must be set in place; key to this is being able to assess the ability of the classification to represent (discriminate between) different seafloor communities. Here we describe an approach for validating the NZSCC using temporally independent evaluation data for demersal fish and benthic invertebrates (the latter sampled via a different method), which identifies whether the NZSCC represents different seafloor communities (i.e., assesses classification strength), evaluates the underlying statistical model, and considers heterogeneity in environmental coverage and statistical uncertainty. Additionally, the availability of abundance estimates for these evaluation datasets provides an opportunity to test whether the NZSCC—which was developed using presence‐absence data—can reflect abundance‐weighted seafloor communities. The ANOSIM global R values (measuring classification strength) were 0.53 and 0.46 (and significant at the 1% level) for demersal fish and benthic invertebrates, respectively, indicating that the NZSCC groups define biologically distinctive environments. The proportion of significant inter‐group differences were very high (95% and 97% for demersal fish and benthic invertebrates, respectively) suggesting NZSCC groups were distinct from each other in their taxonomic composition. There were positive relationships between the evaluation datasets and the underlying statistical model. There was no evidence of these relationships being affected by the statistical uncertainty of the NZSCC. NZSCC model validation metrics using abundance evaluation data were also moderately high (albeit lower than for presence‐absence for invertebrates) suggesting that the NZSCC, can at least in part, represent variation in abundance‐weighted communities. Results presented here suggest that the existing NZSCC is currently fit‐for‐purpose for informing management decisions.
doi_str_mv 10.1002/aqc.4114
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subjects Abundance
Algae
Benthic fauna
Benthos
Classification
Datasets
Demersal fish
demersal fish, benthic invertebrates
Evaluation
Fish
gradient Forest model
Heterogeneity
Invertebrates
Marine fishes
Mathematical models
NZSCC
Ocean floor
presence‐absence
Reef fish
Reef fishes
Robustness (mathematics)
spatial management, biodiversity
Spatial planning
Statistical models
Uncertainty
validating
Zoobenthos
title Independent statistical validation of the New Zealand Seafloor Community Classification
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