Acetate uptake from ambient water by the free-living marine nematodeAdoncholaimus thalassophygas

Abstract

Nematodes belonging to the family Oncholaimidae are known to aggregate at sites of organic pollution. The oncholaimid Adoncholaimus thalassophygas (De Man, 1876), collected from the Weser Estuary, FRG, in 1989, has the capability to take up acetate at naturally occurring concentrations. Under almost axenic conditions, ca 2.3 to 3.0 ng sodium acetate was taken-up per worm within 24 h, when an ambient concentration of 0.33 mmol was offered. The concentration factor was ca 8.5 to 11.1. The results suggest that a highly motile oxybiotic nematode may benefit from the fermentation products of anoxic habitats.

Nutritional importance of benthic bacteria for deep‐sea nematodes from the Arctic ice margin: Results of an isotope tracer experiment

“…If so, this would imply that respiration is an important, unmeasured part of the nematode response in this study. Direct respiration of the simple labile compounds, glucose and acetate, seems feasible, since direct uptake by nematodes has experimentally been proven before for both compounds (Chia and Warwick 1969;Montagna 1984;Riemann et al 1990). However, a similar lack of accumulation of the 13 C label was found for the more complex and nitrogen-containing amino acids.…”

Meiobenthic community underneath the carcass of a stingray: a snapshot after natural death

“…data). These observations suggest that oncholaimids tolerate the presence of sulfides, are attracted to putrefied conditions and are able to utilize (parts of) the nutritious mixture of the body remains of dead organisms, bacterial epigrowth, dissolved glucose and the end products of fermentation (Lopez et al 1979, Riemann et al 1990, Moens et al 1999. The other 2 species restricted to the carcass, Calomicro laimus sp.…”

“…Adonchola i mus species are facultative predators that exhibit a variety of feeding strategies (Moens et al 1999). A. thalassophygas De Man, 1876, for example, can benefit from the fermentation products (acetate) of anoxic habitats (Riemann et al 1990) and are attracted to patches of intense microbial degradation (Riemann & Schrage 1988). Studies on other co-familial genera (Oncholaimidae) have also reported members of this family scavenging on dead and moribund macrofauna, as well as being associated with rotted seaweed (Ulva sp.…”

Environmental modulation of the plankton community composition and size-structure along the eutrophic intertidal coast of the Río de la Plata estuary, Argentina

“…The biovolume was then converted to dry weight after Mc Cauley (1984). We estimated the dry weight of other zooplanktonic groups (cladocerans, copepods, and nematodes) using a regression formula that expressed weight as a function of length in a linear morphology (Wieser, 1960;Dumont et al, 1975;Bottrell et al, 1976;Riemann, 1990). For converting the data of dry weight into values of organic-carbon content, we used the factors that had been proposed for each different group: aloricate ciliates (Putt and Stoecker, 1989), tintinnids (Verity and Langdon, 1984), rotifers (Heinbokel et al, 1988), copepods (Beers and Stewart, 1970), nematodes (Feller and Warwick, 1988), and cladocerans (Margalef, 1983).…”