Global patterns of bioturbation intensity and mixed depth of marine soft sediments

Journal article


Teal, L. R., Bulling, Mark T., Parker, E. R. and Solan, Martin 2013. Global patterns of bioturbation intensity and mixed depth of marine soft sediments. Aquatic Biology. https://doi.org/10.3354/ab00052
AuthorsTeal, L. R., Bulling, Mark T., Parker, E. R. and Solan, Martin
Abstract

ABSTRACT: The importance of bioturbation in mediating biogeochemical processes in the upper centimetres of oceanic sediments provides a compelling reason for wanting to quantify in situ rates of bioturbation. Whilst several approaches can be used for estimating the rate and extent of bioturba- tion, most often it is characterized by calculating an intensity coefficient (D b ) and/or a mixed layer depth (L). Using measures of D b (n = 447) and L (n = 784) collated largely from peer-reviewed litera- ture, we have assembled a global database and examined patterns of both L and D b . At the broadest level, this database reveals that there are considerable gaps in our knowledge of bioturbation for all major oceans other than the North Atlantic, and almost universally for the deep ocean. Similarly, there is an appreciable bias towards observations in the Northern Hemisphere, particularly along the coastal regions of North America and Europe. For the assembled dataset, we find large discrepancies in estimations of L and D b that reflect differences in boundary conditions and reaction properties of the methods used. Tracers with longer half-lives tend to give lower D b estimates and deeper mixing depths than tracers with shorter half-lives. Estimates of L based on sediment profile imaging are significantly lower than estimates based on tracer methods. Estimations of L, but not D b , differ between biogeographical realms at the global level and, at least for the Temperate Northern Atlantic realm, also at the regional level. There are significant effects of season irrespective of location, with higher activities (D b ) observed during summer and deeper mixing depths (L) observed during autumn. Our evaluation demonstrates that we have reasonable estimates of bioturbation for only a limited set of conditions and regions of the world. For these data, and based on a conservative global mean (±SD) L of 5.75 ± 5.67 cm (n = 791), we calculate the global volume of bioturbated sediment to be >20 700 km 3 . Whilst it is clear that the role of benthic invertebrates in mediating global ecosystem processes is substantial, the level of uncertainty at the regional level is unacceptably high for much of the globe.

ABSTRACT: The importance of bioturbation in mediating biogeochemical processes in the upper
centimetres of oceanic sediments provides a compelling reason for wanting to quantify in situ rates of
bioturbation. Whilst several approaches can be used for estimating the rate and extent of bioturba-
tion, most often it is characterized by calculating an intensity coefficient (D b ) and/or a mixed layer
depth (L). Using measures of D b (n = 447) and L (n = 784) collated largely from peer-reviewed litera-
ture, we have assembled a global database and examined patterns of both L and D b . At the broadest
level, this database reveals that there are considerable gaps in our knowledge of bioturbation for all
major oceans other than the North Atlantic, and almost universally for the deep ocean. Similarly,
there is an appreciable bias towards observations in the Northern Hemisphere, particularly along the
coastal regions of North America and Europe. For the assembled dataset, we find large discrepancies
in estimations of L and D b that reflect differences in boundary conditions and reaction properties of
the methods used. Tracers with longer half-lives tend to give lower D b estimates and deeper mixing
depths than tracers with shorter half-lives. Estimates of L based on sediment profile imaging are
significantly lower than estimates based on tracer methods. Estimations of L, but not D b , differ
between biogeographical realms at the global level and, at least for the Temperate Northern Atlantic
realm, also at the regional level. There are significant effects of season irrespective of location, with
higher activities (D b ) observed during summer and deeper mixing depths (L) observed during
autumn. Our evaluation demonstrates that we have reasonable estimates of bioturbation for only a
limited set of conditions and regions of the world. For these data, and based on a conservative global
mean (±SD) L of 5.75 ± 5.67 cm (n = 791), we calculate the global volume of bioturbated sediment to
be >20 700 km 3 . Whilst it is clear that the role of benthic invertebrates in mediating global ecosystem
processes is substantial, the level of uncertainty at the regional level is unacceptably high for much
of the globe.

Year2013
JournalAquatic Biology
ISSN1864-7782
1864-7790
Digital Object Identifier (DOI)https://doi.org/10.3354/ab00052
Web address (URL)http://hdl.handle.net/10545/293776
hdl:10545/293776
Publication dates11 Jun 2013
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Deposited11 Jun 2013, 10:03
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