An apparent lack of response by metazoan meiofauna to phytodetritus deposition in the bathyal northeast Atlantic

Gooday, A. J., Pfannkuche, Olaf and Lambshead, P. J. D. (1996) An apparent lack of response by metazoan meiofauna to phytodetritus deposition in the bathyal northeast Atlantic Journal of the Marine Biological Association of the United Kingdom, 76 (2). pp. 297-310. DOI 10.1017/S0025315400030563.

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Metazoan meiofauna were studied in replicated multiple-corer samples obtained at a bathyal site (1320–1360 m depth) in the Porcupine Seabight (51°36′N 13°00′W) before (April) and after (July) the delivery to the seafloor of a phytodetrital pulse originating from the 1982 spring bloom. In all samples the metazoan meiofauna was dominated by nematodes; harpacticoid copepods and their nauplii were the second most abundant taxon. Population densities and biomass were very similar in both sample sets, the only significant differences being in the numbers of ostracods (higher in April) and nauplii (higher in July). Furthermore, vertical distribution patterns in the top 5 cm of sediment indicate that the meiofauna did not migrate towards the sediment surface following the phytodetrital pulse. The lack of a metazoan meiofaunal response contrasts with published evidence, based on the same samples, for a substantial increase in the foraminiferal abundance following the sedimentation event. Thus our results suggest that metazoans (as a whole) fail to exploit and utilize phytodetritus as rapidly as foraminifera. This probably reflects the energetic expense of egg production coupled with frequently slower rates of somatic growth among metazoans. In addition, foraminifera may outcompete metazoans for detrital food because they possess extremely efficient food-gathering organelles (granuloreticulate pseudopodia) and are able to raise their levels of metabolic activity very rapidly. However, metazoan responses at the species level, or over longer time periods (>3 months), would not have been detected and so remain a possibility.

Document Type: Article
Keywords: Metazoan meiofauna, phytodetritus deposition, bathyal northeast Atlantic
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
Refereed: Yes
DOI etc.: 10.1017/S0025315400030563
ISSN: 0025-3154
Date Deposited: 18 Feb 2008 17:23
Last Modified: 14 Nov 2017 11:23

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