Zur Ökologie vonPomatoceros triqueter (Serpulidae, Polychaeta)

Abstract

On the ecology of Pomatoceros triqueter (Serpulidae, Polychaeta). II. Influence of temperature on tolerance, regeneration of the tube, oxygen consumption and filtration activity. Based on previous studies (K16ckner, 1976b) dealing with field investigatSons on breeding season, choice of substratum, growth and mortality of the sessile filter-feeding tube worm Pomatoceros triqueter in Helgoland waters (southern North Sea), data from laboratory experiments on the physiological potential of the polychaete in regard to temperature are presented. Adult worms tolerated temperatures from -3 ~ C (24 h LT 28) to 30 ~ C (24 h LT 50) when heated or cooled in steps of i C ~ d 1; a two-week period of acclimation within 6 ~ to 18 ~ C did not change their tolerance. Standard oxygen consumption and regeneration of the calcareous tube were found to be dependent on temperature, body weight and food supply; acclimation periods of two weeks had no significant influence. Highly increasing metabolic rates were noted between 6 ~ and 18 ~ C (Q10-values up to 6) and .a maximum was found between 20 ~ and 24 ~ C (0.32 #g 02 mg-Ih -~ and 10.2 #g CaCO8 mg-ld-1); tube regeneration followed a nonlinear regression of y = ax -b when compared to body weight and was reduced by starving animals to less than 50 ~ within 15 days. Filtration activity of P. triqueter, however, was found to be highly independent of temperature from 12 ~ to 24 ~ C; maximum activity was 1 ml mg -1 h -'1 (all data refer to fresh weight). For comparisons with the results of previous field investigations on P. triqueter some intraspecific correlations of the different parameters employed (tube sizes, fresh and dry weight) are presented as exponential functions of y = axb. EINLEITUNG

Comparative study of water-processing in two ciliary filter-feeding polychaetes (Ditrupa arietina and Euchone papillosa) from two different habitats

“…The general trend for E. papillosa (Table 1), but not D. arietina (Table 2), to become satiated after a second algal addition to the experimental aquarium supports this interpretation. Use of high particle concentrations in earlier clearance experiments may explain the generally low values found for filter-feeding polychaetes by other workers (Dales 1957, 1961, Buhr 1976, Klöckner 1978, Shumway et al 1988, Davies et al 1989). For example, in a study of Lanice conchilega, Buhr (1976) used a Dunaliella marina algal concentration of 40 000 cells ml…”

Filtration of the Microalga Amphidinium carterae by the Polychaetes Sabella spallanzanii and Branchiomma luctuosum: A New Tool for the Control of Harmful Algal Blooms?

“…Clearance rates of other polychaete species were always estimated by using phytoplankton in laboratory and field experiments [22][23][24]29,30,33,34,[53][54][55][56]. In particular, the filtering activity of S spallanzanii has been investigated by Clapin [29] and Lemmens et al [56], who reported that this species has a filtering capacity similar to that of the macrofilter-feeder community inhabiting the Posidonia sinuosa meadows of Southern Flats in Cockburn Sound (Australia).…”

Filtering capacity of seagrass meadows and other habitats of Cockburn Sound, Western Australia

“…Dales 1957, 1961, Buhr 1976, Klockner 1978, Shumway et al 1988, Riisgard 1989, RiisgArd et al 1992). We applied a mean clearance rate of 23.8 1 g-' AFDW d-' for infaunal polychaetes.…”

“…S), possibly because they tend to be more common near the leaf sheaths (J Lemmens pers, obs. ), which are more favourably placed in the water current than in Posidonia (see remarks by Keough 1986 "lapin (1996); see 'Materials and methods' 'Compilation of data from range of publications: Dales (1957Dales ( , 1961, Buhr (1976), Klockner (1978), Shumway et al (1988), RiisgArd (1989RiisgArd ( , 1991 ' Bullivant (1968) Wejswig (1971,1974,1975). Frost (1978), Jargensen (1983 Hydroids and amphipods are few, as are macro-filter-feeders, while infaunal polychaetes are relatively rare within these meadows.…”