Working on a baseline for the Kongsfjorden food web: production and properties of macroalgal particulate organic matter (POM), supplementary material


Autoria(s): Buchholz, Cornelia Maria; Wiencke, Christian
Cobertura

LATITUDE: 78.985100 * LONGITUDE: 11.965900 * MINIMUM ELEVATION: 5.0 m * MAXIMUM ELEVATION: 5.0 m

Data(s)

29/01/2015

Resumo

Macroalgae, in particular kelps, produce a large amount of biomass in Kongsfjorden, which is to a great extent released into the water in an annual cycle. As an example, the brown alga Alaria esculenta loses its blade gradually, 3 ± 0.8 % of the blade area per day (August 2012), thereby adding to the pool of particulate organic matter (POM) in the fjord. Upon release small thallus pieces are "aging" in that they are prone to leaching and serving as substrate for microorganisms, thus turning into palatable food for suspension and bottom feeders. In order to define a macroalgal baseline for the Kongsfjorden food web, stable isotopes d14C and d15N were measured in individuals of A. esculenta, Saccharina latissima and Laminaria digitata directly sampled after collection and in artificially produced POM (aPOM) of A. esculenta that was allowed to age under experimental conditions. In aPOM from this species sampled in August 2012 the C/N ratios decreased between d1 and d8 of a 14-day culture period in parallel to the fading photosynthetic activity of the algal fragments as demonstrated by use of an Imaging-PAM. Microscopic observations of the aPOM in August 2012 and 2013 revealed the frequent occurrence of small brown algal endo- and epiphytes. First feeding experiments with Mysis oculata (Mysids) and Hiatella arctica (Bivalves) showed that these species can ingest macroalgal POM. The importance of kelp-derived POM for the food web is subject of the current research.

Formato

application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, 40.0 kBytes

Identificador

https://doi.pangaea.de/10.1594/PANGAEA.857530

doi:10.1594/PANGAEA.857530

Idioma(s)

en

Publicador

PANGAEA

Direitos

CC-BY: Creative Commons Attribution 3.0 Unported

Access constraints: unrestricted

Fonte

Supplement to: Buchholz, Cornelia Maria; Wiencke, Christian (2015): Working on a baseline for the Kongsfjorden food web: production and properties of macroalgal particulate organic matter (POM). Polar Biology, online first, 12 pp, doi:10.1007/s00300-015-1828-3

Palavras-Chave #DIVER; Hansneset; Kongsfjorden, Spitsbergen, Arctic; Sampling by diver
Tipo

Dataset