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Light and nutrient limitation of sea-ice microalgae (Hudson Bay, Canadian Arctic)
OLR(1990)37 (12)
E. BiologicalOceanography
E270. Microphyles (coccolithophores, diatoms, flagellates, etc.) Gosselin, Michel, Louis and Serge Demers, limitation of sea-ice Canadian Arctic). J.
90:7184 Legendre, J.-C. Therriault 1990. Light and nutrient microalgae (lludson Bay, Phycol~ 26(2):220-232.
The hypothesis that ice algae are light-limited at the beginning of the spring growth period, and later are subject to periods of nutrient limitation was tested by analyzing the chemical composition of cells throughout boreal spring. The results indicated that a period of light limitation in April was followed by silicon-limited growth (May). Silicon varied with the tidal mixing cycle. Legendre: Dept. de biol., Univ. Laval, Quebec, PQ G I K 7P4, Canada. (gsb)
1125 90:7187
Becker, P.tt., 1989. Seabirds as monitor organisms of contaminants along the German North Sea coast. Helgol~nder Meeresunters, 43(3-4):395-403. In the 1980s, significant regional, interspecific and annual differences in contamination with toxic chemicals were found in eggs of breeding birds along the German North Sea coast. In 1987, a three-year monitoring program for common tern Sterna hirundo and oystercatcher Haematopus ostralegus was started. Eggs from areas along the coast are now being analysed for chlororganic residues and mercury. First results on geographical and year-to-year variation are presented here, and the advantages of seabird eggs as spatial and temporal monitors of marine pollution are discussed. The suggestion is made to include a shore-breeding bird species in the European monitoring programs. Inst. fur Vogelforschung, D-2940 Wilhelmshaven 15, FRG.
90:7185
Raimbault, P., V. Gentilhomme and G. Slawyk, 1990. Short-term responses of 24 hour N-starved cultures of Phaeodactylum tricornutum to pulsed additions of nitrate at nanomolar levels. Mar. EcoL-Prog. Set, 63(1):47-52. A high cell-density chemostat culture and a dilute sample were used to study the uptake of low nitrate concentrations by N-starved populations of the diatom P. tricornutum. Nitrate was immediately taken up at a high rate following pulsed nitrate additions of 15 to 100 nM. These initial rates exceeded the daily growth rate by a factor of 2.5 over a short time. Although starvation greatly changed the pattern of the nitrate pulse utilization, this diatom appears to be able to meet its N requirements in response to a sudden increase of nitrate in the nanomolar range. Ctr. d'Oceanol, de Marseille, Fac. des Sci. de Luminy, Case 901, F-13288 Marseille, France.
E300. Effects of pollution (also uptake, trace accumulations, etc.; see also B350Atmospheric pollution, C210-Chemical pollution, F 2 5 0 - W a s t e disposal) 90:7186
Ariese, F. ct al., 1990. Shporskii spectrufluorimetric determination of polycyclic aromatic hydrocarhons in biota. Analytica chim. Acta, 232(2):245251. Dept. of Genl. and Analyt. Chem., Free Univ., De Boelelaan 1083, 1081 HV Amsterdam, Netherlands.
90:7188
Bierkens, J. and K. Simkiss, 1990. The use of chemical analogues such as Eu/Am in ecotoxicological studies. Functional Ecol, 4(3):445--447. Studies on ~52Eushow that it is a good analogue for the radiotoxic 24~Am in both marine crabs and freshwater crayfish. The accumulation of both the lanthanide and the actinide show that their environmental distribution is dictated by surface adsorption onto exoskeletons and cellular deposits. Paterson Inst. for Cancer Res., Wilmslow Rd., Manchester M20 9BX, UK. 90:7189 Brouwer, A., A.J. Murk and J.H. Koeman, 1990. Essay review. Biochemical and physiological approaches in ecotoxicology. Functional Ecol, 4(3):275-281. An interdisciplinary strategy is proposed for examining the effects of chemicals on organisms; it addresses the possible role of biochemical/ endocrinological factors in determining susceptibility of individual species to potentially toxic chemicals. Specifically, metabolic differences between PCB-sensitive common seals and PCB-insensitive herring gulls are described. Dept. of Toxicol., Agricultural Univ., Bomenweg 2, 6703 lID Wageningen, Netherlands. (gsb) 90:7190
Delille, D. and N. Vaillant, 1990. The Influence of crude oU on the growth of subantarctie marine bacteria. A ntarct. Sci, 2(2): 123- ! 27. The short term degradation of 'Arabian light' crude oil was followed under various seasonal conditions
E. BiologicalOceanography
E270. Microphyles (coccolithophores, diatoms, flagellates, etc.) Gosselin, Michel, Louis and Serge Demers, limitation of sea-ice Canadian Arctic). J.
90:7184 Legendre, J.-C. Therriault 1990. Light and nutrient microalgae (lludson Bay, Phycol~ 26(2):220-232.
The hypothesis that ice algae are light-limited at the beginning of the spring growth period, and later are subject to periods of nutrient limitation was tested by analyzing the chemical composition of cells throughout boreal spring. The results indicated that a period of light limitation in April was followed by silicon-limited growth (May). Silicon varied with the tidal mixing cycle. Legendre: Dept. de biol., Univ. Laval, Quebec, PQ G I K 7P4, Canada. (gsb)
1125 90:7187
Becker, P.tt., 1989. Seabirds as monitor organisms of contaminants along the German North Sea coast. Helgol~nder Meeresunters, 43(3-4):395-403. In the 1980s, significant regional, interspecific and annual differences in contamination with toxic chemicals were found in eggs of breeding birds along the German North Sea coast. In 1987, a three-year monitoring program for common tern Sterna hirundo and oystercatcher Haematopus ostralegus was started. Eggs from areas along the coast are now being analysed for chlororganic residues and mercury. First results on geographical and year-to-year variation are presented here, and the advantages of seabird eggs as spatial and temporal monitors of marine pollution are discussed. The suggestion is made to include a shore-breeding bird species in the European monitoring programs. Inst. fur Vogelforschung, D-2940 Wilhelmshaven 15, FRG.
90:7185
Raimbault, P., V. Gentilhomme and G. Slawyk, 1990. Short-term responses of 24 hour N-starved cultures of Phaeodactylum tricornutum to pulsed additions of nitrate at nanomolar levels. Mar. EcoL-Prog. Set, 63(1):47-52. A high cell-density chemostat culture and a dilute sample were used to study the uptake of low nitrate concentrations by N-starved populations of the diatom P. tricornutum. Nitrate was immediately taken up at a high rate following pulsed nitrate additions of 15 to 100 nM. These initial rates exceeded the daily growth rate by a factor of 2.5 over a short time. Although starvation greatly changed the pattern of the nitrate pulse utilization, this diatom appears to be able to meet its N requirements in response to a sudden increase of nitrate in the nanomolar range. Ctr. d'Oceanol, de Marseille, Fac. des Sci. de Luminy, Case 901, F-13288 Marseille, France.
E300. Effects of pollution (also uptake, trace accumulations, etc.; see also B350Atmospheric pollution, C210-Chemical pollution, F 2 5 0 - W a s t e disposal) 90:7186
Ariese, F. ct al., 1990. Shporskii spectrufluorimetric determination of polycyclic aromatic hydrocarhons in biota. Analytica chim. Acta, 232(2):245251. Dept. of Genl. and Analyt. Chem., Free Univ., De Boelelaan 1083, 1081 HV Amsterdam, Netherlands.
90:7188
Bierkens, J. and K. Simkiss, 1990. The use of chemical analogues such as Eu/Am in ecotoxicological studies. Functional Ecol, 4(3):445--447. Studies on ~52Eushow that it is a good analogue for the radiotoxic 24~Am in both marine crabs and freshwater crayfish. The accumulation of both the lanthanide and the actinide show that their environmental distribution is dictated by surface adsorption onto exoskeletons and cellular deposits. Paterson Inst. for Cancer Res., Wilmslow Rd., Manchester M20 9BX, UK. 90:7189 Brouwer, A., A.J. Murk and J.H. Koeman, 1990. Essay review. Biochemical and physiological approaches in ecotoxicology. Functional Ecol, 4(3):275-281. An interdisciplinary strategy is proposed for examining the effects of chemicals on organisms; it addresses the possible role of biochemical/ endocrinological factors in determining susceptibility of individual species to potentially toxic chemicals. Specifically, metabolic differences between PCB-sensitive common seals and PCB-insensitive herring gulls are described. Dept. of Toxicol., Agricultural Univ., Bomenweg 2, 6703 lID Wageningen, Netherlands. (gsb) 90:7190
Delille, D. and N. Vaillant, 1990. The Influence of crude oU on the growth of subantarctie marine bacteria. A ntarct. Sci, 2(2): 123- ! 27. The short term degradation of 'Arabian light' crude oil was followed under various seasonal conditions