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Life strategies in two bacterivorous marine nematodes : preliminary results

Tom Moens (UGent) , Andy Vierstraete (UGent) and Magda Vincx (UGent)
Author
Organization
Abstract
Temperature dependence of sex ratio and maximal densities of the estuarine, deposit-feeding nematodes Pellioditis marina (Rhabditidae) and Diplolaimelloides meyli (Monhysteridae) were investigated in vitro. Both species are characteristic for organically enriched habitats. Data from competition culture experiments with both species are integrated with information from respiration measurements at different temperatures, and from observations on the influence of temperature and bacterial density on uptake rates. Sex ratio was significantly influenced by temperature in both species, with the highest relative numbers of males at the highest temperatures. Total numbers attained fluctuated only moderately in the 10 to 20 degrees C interval, but increased and decreased highly significantly at 25 degrees C for D. meyli and P. marina, respectively. Respiration at temperatures from 5 degrees C to 30 degrees C was measured with nematodes from monospecific cultures using a modified Clark electrode procedure. Respiration was dependent upon temperature in the entire range for P. marina, but not for D. meyli, where only at 25 degrees C a clear respiratory acceleration was observed. Feeding experiments with P. marina showed a dominant influence of bacterial density on uptake rates, with a lower but still significant temperature effect. These data are discussed in relation to the overall life strategies of both species.
Keywords
Nematodes, feeding, respiration, life strategies, FEEDING BIOLOGY, ADONCHOLAIMUS-THALASSOPHYGAS, DIPLOLAIMELLOIDES-BRUCIEI, AQUATIC NEMATODES, WATER, TEMPERATURE, ECOLOGY, MINERALIZATION, BIOTURBATION, ENERGETICS

Citation

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Chicago
Moens, Tom, Andy Vierstraete, and Magda Vincx. 1996. “Life Strategies in Two Bacterivorous Marine Nematodes : Preliminary Results.” Marine Ecology-pubblicazioni Della Stazione Zoologica Di Napoli I 17 (1-3): 509–518.
APA
Moens, T., Vierstraete, A., & Vincx, M. (1996). Life strategies in two bacterivorous marine nematodes : preliminary results. MARINE ECOLOGY-PUBBLICAZIONI DELLA STAZIONE ZOOLOGICA DI NAPOLI I, 17(1-3), 509–518. Presented at the 29th European Marine Biology symposium.
Vancouver
1.
Moens T, Vierstraete A, Vincx M. Life strategies in two bacterivorous marine nematodes : preliminary results. MARINE ECOLOGY-PUBBLICAZIONI DELLA STAZIONE ZOOLOGICA DI NAPOLI I. 1996;17(1-3):509–18.
MLA
Moens, Tom, Andy Vierstraete, and Magda Vincx. “Life Strategies in Two Bacterivorous Marine Nematodes : Preliminary Results.” MARINE ECOLOGY-PUBBLICAZIONI DELLA STAZIONE ZOOLOGICA DI NAPOLI I 17.1-3 (1996): 509–518. Print.
@article{305471,
  abstract     = {Temperature dependence of sex ratio and maximal densities of the estuarine, deposit-feeding nematodes Pellioditis marina (Rhabditidae) and Diplolaimelloides meyli (Monhysteridae) were investigated in vitro. Both species are characteristic for organically enriched habitats. Data from competition culture experiments with both species are integrated with information from respiration measurements at different temperatures, and from observations on the influence of temperature and bacterial density on uptake rates. 
Sex ratio was significantly influenced by temperature in both species, with the highest relative numbers of males at the highest temperatures. Total numbers attained fluctuated only moderately in the 10 to 20 degrees C interval, but increased and decreased highly significantly at 25 degrees C for D. meyli and P. marina, respectively. 
Respiration at temperatures from 5 degrees C to 30 degrees C was measured with nematodes from monospecific cultures using a modified Clark electrode procedure. Respiration was dependent upon temperature in the entire range for P. marina, but not for D. meyli, where only at 25 degrees C a clear respiratory acceleration was observed. 
Feeding experiments with P. marina showed a dominant influence of bacterial density on uptake rates, with a lower but still significant temperature effect. 
These data are discussed in relation to the overall life strategies of both species.},
  author       = {Moens, Tom and Vierstraete, Andy and Vincx, Magda},
  issn         = {0173-9565},
  journal      = {MARINE ECOLOGY-PUBBLICAZIONI DELLA STAZIONE ZOOLOGICA DI NAPOLI I},
  keyword      = {Nematodes,feeding,respiration,life strategies,FEEDING BIOLOGY,ADONCHOLAIMUS-THALASSOPHYGAS,DIPLOLAIMELLOIDES-BRUCIEI,AQUATIC NEMATODES,WATER,TEMPERATURE,ECOLOGY,MINERALIZATION,BIOTURBATION,ENERGETICS},
  language     = {eng},
  location     = {Vienna, Austria},
  number       = {1-3},
  pages        = {509--518},
  title        = {Life strategies in two bacterivorous marine nematodes : preliminary results},
  volume       = {17},
  year         = {1996},
}