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The role of erosion by fish in shaping topography around Hudson submarine canyon.

Journal of Sedimentary Petrology

By:
, , , and
https://doi.org/10.1306/212F87C9-2B24-11D7-8648000102C1865D

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Abstract

An 800-km 2 area of rough topography around the head of Hudson Canyon off the eastern United States is attributed to erosion by tilefish ( Lopholatilus chamaeleonticeps ) and associated species of crustaceans. The rough topography has a relief of 1-10 m, occurs in water depths of 120-500 m, and has been cut into a semilithified, silty clay substrate since the onset of the Holocene transgression. Commercial fishing activity indicates that a large population of tilefish, which dig burrows in the sea floor, occupy the area of the rough topography. Average tilefish burrows are 1.6 m in diameter and 1.7 m in depth. They have a clustered, not uniform, distribution, and their average density is 2,500 per km 2 . The close match of areas of rough topography and high tilefish populations, the active burrowing of the sea floor, and the clustered distribution of the burrows suggest that the hummocky topography in this area may be the result of continuous erosion by tilefish and associated crustaceans during the Holocene. An erosion rate of 13 cm per 1,000 years is necessary to create this topography during the past 13,000 years--and 18 cm per 1,000 years if(as is more likely based on the depths at which tilefish presently are found) the erosion started 9,000 years ago.

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Additional publication details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
The role of erosion by fish in shaping topography around Hudson submarine canyon.
Series title:
Journal of Sedimentary Petrology
DOI:
10.1306/212F87C9-2B24-11D7-8648000102C1865D
Volume:
55
Issue:
5
Year Published:
1985
Language:
English
Publisher:
Society for Sedimentary Geology
Contributing office(s):
Woods Hole Coastal and Marine Science Center
Description:
8 p.
First page:
712
Last page:
719
Country:
United States
State:
New York