Gradual and rapid shifts in the composition of assemblages of hydroids (Cnidaria) along depth and latitude in the deep Atlantic Ocean
Advanced Search
Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.

Search our Collections & Repository

All these words:

For very narrow results

This exact word or phrase:

When looking for a specific result

Any of these words:

Best used for discovery & interchangable words

None of these words:

Recommended to be used in conjunction with other fields



Publication Date Range:


Document Data


Document Type:






Clear All

Query Builder

Query box

Clear All

For additional assistance using the Custom Query please check out our Help Page


Gradual and rapid shifts in the composition of assemblages of hydroids (Cnidaria) along depth and latitude in the deep Atlantic Ocean

Filetype[PDF-612.40 KB]


  • Journal Title:
    Journal of Biogeography
  • Description:

    Despite growing knowledge on deep‐sea benthic fauna, patterns of changes in species composition combining both bathymetric and latitudinal variation are still poorly known. In the first synthesis on the beta diversity patterns of assemblages of hydroids across an entire ocean basin, our aim was to infer limits and gradients of species distribution along depth and latitude.


    Atlantic Ocean and adjacent polar seas.




    Hydroids from 50 to 5,330 m deep were studied primarily based on museum collections. Identifications were made by the authors, improving uniformity within the dataset by avoiding variations in taxonomic interpretation. Data totalled 3,699 records belonging to 432 species, at 1,444 unique sites. Records were assigned to three depth strata (50–200, 201–1,000 and 1,001–5,330 m) and eight latitudinal bands of 20° each, totalling 24 sample areas. We conducted non‐metric multidimensional scaling (NMDS) ordination, clustering and PERMANOVA analyses of species compositions and abundances per area to examine differences and relationships in hydroid assemblages among areas.


    Assemblages primarily differentiate between those to the north and south of 40°S, regardless of depth, with southern ones separated between Patagonian and Antarctic. Northwards of 40°S, assemblages differentiate gradually along both depth and latitude, although a faunal turnover occurs at 1,000 m deep. Also, assemblages at 1,001–5,330 m deep tend to be more similar to each other than assemblages at shallower strata, suggesting significant connectivity over great distances in the deep sea. We note the problem of largely unequal hydroid sampling in the Atlantic Ocean across depths and latitudes, especially in the southern hemisphere and below 1,000 m deep.

    Main Conclusions

    Assemblages of hydroids differentiate gradually along latitude and depth, with more rapid shifts in species composition occurring at 40°S, 60°S and at 1,000 m deep. Greater similarity was found among deeper water assemblages.

  • Source:
    Journal of Biogeography 47(7): 1541-1551, 2020
  • Document Type:
  • Place as Subject:
  • Rights Information:
    Accepted Manuscript
  • Compliance:
  • Main Document Checksum:
  • File Type:

Supporting Files

  • No Additional Files

More +

You May Also Like

Checkout today's featured content at

Version 3.26