Genetic basis of grammar defect
1990; Nature Portfolio; Volume: 347; Issue: 6288 Linguagem: Inglês
10.1038/347026a0
ISSN1476-4687
Autores Tópico(s)Language Development and Disorders
ResumoGEOSECS and Transient Tracers in the Ocean (ITO) studies considered by Fanning.Our results are presented in the table and suggest that the surface waters of this area of the Sargasso Sea are deficient in both nitrogen and phosphorus for most of the time, rather than phosphorusdeficient as suggested by Fanning.The two data sets are different in that one provides geographical coverage and the other is a time series at a single point, but we would argue from the stationS data set that the situation suggested by Fanning is not necessarily the general case.A more fundamental point, however, involves the extrapolation of nutrient detectability, as described above and in Fanning's paper, with nutrient limitation because there is clear evidence that high rates of primary productivity can be sustained at very low nutrient concentrations by intense nutrient recycling'.Therefore considerations of nutrient limitation based on rates of nutrient consumption and carbon production would be more appropriate.
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