Research Data

Marine macroalgal genus richness [data used in Keith et al. 2014]


Print this Page Print this Page
Show all sections
Marine macroalgal genus richness [data used in Keith et al. 2014]
Date Record Created
Date Record Modified
Date Coverage
(no information)
Time Period
(no information)
Geospatial Location
  1. Type: full

    This dataset consists of an ESRI shapefile showing genus richness counts of 3 macroalgal clades (Rhodophyta, Chlorophyta, Phaeophyceae) at 367 sites used in the analyses of Keith et al (2014)

    Data extent: latitude 70S - 70N

    Projection: World Equidistant Cylindrical.

    Abstract [Related Publication]:

    Aim: Marine macroalgae provide an excellent opportunity to test hypotheses about latitudinal diversity gradients because macroalgal richness decreases towards the tropics, contrary to classic patterns, and because three evolutionarily distinct macroalgal clades (Rhodophyta, Chlorophyta, Phaeophyceae) have converged ecologically. Specifically, we determine the extent to which environmental conditions can predict genus richness in macroalgae. We also evaluate whether the magnitude or direction of the effect of environmental factors, or their ability to explain variation in macroalgal diversity, varies geographically.

    Location: Global oceans.

    Methods: We formulated and fitted global spatial regression models and geographically weighted regression (GWR) models to determine the extent to which environmental conditions could predict genus richness in macroalgae. GWR allowed us to determine how the role of environmental conditions varied amongst geographical regions.

    Results: The global regression model showed that sea surface temperature and nutrients were important predictors of macroalgal genus richness at a global scale. However, GWR revealed that environmental factors explained less variability in richness in the tropics than elsewhere.

    Main conclusions: Our results show that whilst environmental conditions influence marine macroalgal diversity, the strength of this influence shows considerable geographical variation. In particular, environmental conditions explain more of the observed variation in diversity at high latitudes than at low latitudes. This finding is consistent with the hypothesis that environmental tolerances influence species distributions more strongly at high latitudes, whereas other factors, such as biotic interactions, play a more prominent role in the tropics.

    The full methodology is available in the publication shown in the Related Publications link below.

  2. Type: note

    This dataset is available from Figshare as an ESRI shapefile and PDF file (source reference list). Keith, Sally; P Kerswell, Ailsa; Connolly, Sean R (2013): Marine macroalgal genus richness [data used in Keith et al. 2014]. figshare.

Related Publications
  1. Keith, Sally A., Kerswell, Ailsa P., and Connolly, Sean R. (2014) Global diversity of marine macroalgae: environmental conditions explain less variation in the tropics. Global Ecology and Biogeography, 23 (5). pp. 517-529.
  2. Kerswell, Ailsa P. (2006) Global biodiversity patterns of benthic marine algae. Ecology, 87. pp. 2479-2488.
Related Websites
(no information)
Related Data
(no information)
Related Services
(no information)
Technical metadata
(no information)
  1. Managed by: Dr Sally Keith , , ARC Centre of Excellence for Coral Reef Studies
  2. Associated with: Miss Ailsa Kerswell , , ARC Centre of Excellence for Coral Reef Studies
  3. Associated with: Prof Sean Connolly , , ARC Centre of Excellence for Coral Reef Studies, Marine Biology & Aquaculture
Primary Contact
Dr Sally Keith,
(no information)
(no information)
Fields of Research
  1. 060205 - Marine and Estuarine Ecology (incl. Marine Ichthyology) (060205)
  2. 060202 - Community Ecology (060202)
Socio-Economic Objective
  1. 960805 - Flora, Fauna and Biodiversity at Regional or Larger Scales (960805)
  1. biogeography
  2. macroecology
  3. seaweed
  4. global
  5. richness
  6. diversity
  7. macroalgae
  8. marine biology
  9. ARC Centre of Excellence for Coral Reef Studies
Research Activity
(no information)
Research Themes
Tropical Ecosystems, Conservation and Climate Change
CC BY 4.0: Attribution 4.0 International
License - Other
(no information)
Access Rights/Conditions
Open access. If the data is not freely accessible via the link provided, please contact the nominated data manager or for assistance.
(no information)
Data Location
Online Locations
Stored At
(no information)
Keith, S.; Kerswell, A.; Connolly, S. (2013). Marine macroalgal genus richness [data used in Keith et al. 2014]. James Cook University. (dataset). 504a52cd5babd49e8fb9ec1c70cd1d06