The application of calculation models for estimating primary productivity in two topical Mexican coastal lagoons
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Mee, Laurence D.
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Universidad de Costa Rica
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Se hizo un estudio detallado de la fijación de carbón radiactivo en dos lagunas costeras tropicales de la costa del Pacífico mexicano, con el propósito de estimar la tasa diurna de productividad primaria (∑p), Los datos así obtenidos fueron utilizados para evaluar y adaptar modelos de cálculo para la integración de las curvas de p/I (Productividad/Intensidad luminosa), Las integrales comúnmente empleadas en estudios oceanográficos requieren datos precisos de p en la región de baja iluminación y no contemplan los efectos de la fotoinhibición y, por lo tanto, no son aplicables al caso actual. Se desarrolló un modelo que solamente requiere conocimiento de la altura y posición del máximo sub superficial de p y que permite el cálculo preciso de ∑p.
Data from detailed radiocarbon uptake studies of two turbid and highly productive Mexican tropical coastal lagoons with distinct ecological environments were used to evaluate and adapt calculation models for the integration of total daily 14C productivity (∑p). For such environments, the precision of the conventional methodology does not permit reliable estimates of Ik from the low light regions of p/I curves. Since the widely used "Talling integral" was thus not directly applicable, alternative solutions which only require knowledge of the position and height of the subsurface productivity maximum were evaluated. One of these models was found to predict ∑p to within 10% of planimetric measurements in all cases. Suggestions are given for practical application of this model and for its future development in association with the assimilation number concept.
Data from detailed radiocarbon uptake studies of two turbid and highly productive Mexican tropical coastal lagoons with distinct ecological environments were used to evaluate and adapt calculation models for the integration of total daily 14C productivity (∑p). For such environments, the precision of the conventional methodology does not permit reliable estimates of Ik from the low light regions of p/I curves. Since the widely used "Talling integral" was thus not directly applicable, alternative solutions which only require knowledge of the position and height of the subsurface productivity maximum were evaluated. One of these models was found to predict ∑p to within 10% of planimetric measurements in all cases. Suggestions are given for practical application of this model and for its future development in association with the assimilation number concept.