Details:

Journal Title:
Journal of Biogeography
Personal Author:
Fernandez, Marina O. ; Collins, Allen G. ; Marques, Antonio C.
Fernandez, Marina O. ; Collins, Allen G. ; Marques, Antonio C. Less -
NOAA Program & Office:
NMFS (National Marine Fisheries Service) ; OST (Office of Science and Technology)
NMFS (National Marine Fisheries Service) ; OST (Office of Science and Technology) Less -
Description:
Aim

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.

Location

Atlantic Ocean and adjacent polar seas.

Taxon

Hydrozoa.

Methods

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.

Results

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.


Keywords:
[+]
Biogeography Hydrozoa Deep-sea Benthos Marine Biogeography
Source:
Journal of Biogeography 47(7): 1541-1551, 2020
DOI:
https://doi.org/10.1111/jbi.13853
Document Type:
Journal Article
Place as Subject:
Atlantic Ocean
Rights Information:
Accepted Manuscript
Compliance:
Submitted
Main Document Checksum:
[+]
urn:sha256:c045f5e8a74410613fcebdd1d26b657410ad476728b02ef80f2c4ce4f5eb80cd
Download URL:
https://repository.library.noaa.gov/view/noaa/29174/noaa_29174_DS1.pdf
File Type:

Supporting Files

• No Additional Files

More +