Burrowing of the fiddler crab Uca tangeri in the Ria Formosa in Portugal and its influence on sediment structure

Wolfrath, Birgit (1992) Burrowing of the fiddler crab Uca tangeri in the Ria Formosa in Portugal and its influence on sediment structure Marine Ecology Progress Series, 85 . pp. 237-243.

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Abstract

Burrowing activities of the only European fiddler crab, Uca tangeri, and its resulting influence on biotope in mudflats were investigated during 1989-1990 at Ria Formosa, Portugal. Individuals use the same burrow for ca 1 wk, then occupy another or dig a new one. Overall a burrow is inhabited for ca 3 mo by several individuals before it is abandoned. Vacated burrows decay within 2 to 3 wk. Burrow size and number vary with the season. Burrow density was highest in spring and early summer with ca 17 burrows m-2, and then decreased. Deepest burrows (up to 90 cm long) were found
in winter, the shallowest (up to 40 cm long) in summer. Volume of the sediment moved by U. tangen varied monthly between 3000 and 6000 cm3 per m2 of mudflat. Water is only found in the lower third of the burrow. Burrow water contains less oxygen and more nitrate than the surrounding water of the Ria Formosa.

Document Type: Article
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-B Experimental Ecology - Benthic Ecology
Refereed: Yes
ISSN: 0171-8630
Date Deposited: 09 Mar 2018 10:46
Last Modified: 09 Mar 2018 10:46
URI: http://eprints.uni-kiel.de/id/eprint/42203

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