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The articulated bryozoan genus Cellaria in the southern Zealandian Region: distribution and associated fauna

  • Katerina AchilleosEmail author
  • Abigail M. Smith
  • Dennis P. Gordon
Original Paper
  • 22 Downloads

Abstract

The Zealandian Region centred on New Zealand has the highest diversity of Cellaria species in the world, with three described and 11 undescribed living species. This study assesses their distribution in relation to environmental parameters and characterizes the associated bryozoan fauna in the Southern Zealandian Region based on specimens collected in the years 1911–2018. Cellaria specimens stored in collections in New Zealand were identified to species level, and their metadata were combined with that in the published literature to provide a database for analysis. Distributional data were mapped and assessed in relation to environmental factors: surface chlorophyll-a, sea-surface and seafloor temperature, and substratum type. The bryozoan fauna co-occurring with Cellaria was recorded and characterized according to community assemblage composition. Of the 14 Cellaria species, C. immersa and C. tenuirostris are the most dominant in the southern Zealandian region. Presence/absence records showed that Cellaria species mostly occur at sites with relatively low productivity (0.10–0.99 mg m−3) and relatively high seafloor temperatures (13–14 °C). Sand was identified as the main textural component of the substratum where Cellaria was found. The ability of Cellaria species to colonize soft sediments is of ecological importance in mid-shelf environments where hard substrata are uncommon. The associated bryozoan fauna comprises common elements of bryozoan assemblages and their reef formations around the world and is characterized by species having an erect-rigid colony growth form. The present results can contribute to future ecological analyses using Cellaria species globally as key elements for other bryozoan faunas.

Keywords

Environmental parameters Chlorophyll-a Surface and seafloor temperature Substratum 

Notes

Acknowledgements

We thank Ms. Sadie Mills (Collection Manager, NIWA) and Ms. Diana Macpherson (Assistant Collection Manager, NIWA) for the donation and loan of specimens. We also thank Dr. Kim Currie (NIWA/University of Otago Research Centre for Oceanography) and the crew of RV Polaris II for support and assistance during the collection of some specimens. Dr. Steve Chiswell (NIWA, Wellington) gave guidance regarding seafloor temperature data. Mr. Aubrey Miller (School of Surveying, University of Otago) gave support and assistance with the use of ArcGIS. We are also grateful for the comments of three anonymous reviewers that improved the manuscript.

Funding information

Research funding to KA is provided by University of Otago Department of Marine Science.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

No animal testing was performed during this study.

Sampling and field studies

All necessary permits for sampling and observational field studies have been obtained by the authors from the competent authorities.

Data accessibility statement

All netCDF files for sea surface temperature and chlorophyll-α are available from Nasa Ocean Colour website (https://oceancolor.gsfc.nasa.gov/). The netCDF file for seafloor temperature is available from CSIRO Atlas of Regional Seas (CARS) website (http://www.marine.csiro.au/~dunn/cars2009/). Sediment raster data are available from NZODN (https://nzodn.nz/portal/search). Bathymetry shapefile is available from NIWA website (https://www.niwa.co.nz/our-science/oceans/bathymetry/download-the-data?sid=16080). All data points extracted from the raster files, coordinates, stations and species details, and associated community are available as supplementary material.

Supplementary material

12526_2019_1009_MOESM1_ESM.xlsx (339 kb)
Supplementary material 1 All sampling locations from 1911 to 2018 including presence and absence records (XLSX 338 kb)
12526_2019_1009_MOESM2_ESM.xlsx (621 kb)
Supplementary material 2 Environmental parameters for all sampling locations, including presence and absence records (XLSX 620 kb)
12526_2019_1009_MOESM3_ESM.xlsx (112 kb)
Supplementary material 3 Associated bryozoan fauna found with Cellaria immersa, C. tenuirostris, C. pilosa and Cellaria sp. 5 (XLSX 111 kb)

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Copyright information

© Senckenberg Gesellschaft für Naturforschung 2019

Authors and Affiliations

  1. 1.Department of Marine ScienceUniversity of OtagoDunedinNew Zealand
  2. 2.National Institute of Water and Atmospheric ResearchWellingtonNew Zealand

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