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Título

Spatial and temporal variations in nutrient limitation of seagrass Posidonia oceanica growth in the NW Mediterranean

AutorAlcoverro, Teresa ; Romero, Javier; Duarte, Carlos M. ; López, Nancy I.
Palabras claveNitroogen
Seasonality
Growth
Phosphorus
Retranslocation
Fecha de publicación1997
EditorInter Research
CitaciónMarine Ecology - Progress Series 146 : 155-161 (1997)
Resumenextent and seasonality of nutrient limitation of Posidonia oceanica (L.) Delile in the Costa Brava littoral (NW Mediterranean) in 5 meadows was investigated by means of repeated nutrient additions along a year cycle. Nutrient additions had a modest effect on leaf growth. The response to fertilization varied considerably among meadows, with those meadows consistently maintaining low (300 PM dissolved inorganic nitrogen and 9 pM soluble reactive phosphorus) dissolved inorganic nutrient concentrations in sediment pore waters showing the greatest response to fertlhzation. The seasonality of the growth response to fertilization was consistent with calculated nutrient deficiencies, which were greatest in late spring and summer. Nutrient deficiency was alleviated in the fall, partially due to reduced growth, but also to nutrient reclamation from old leaves, wh~ch represented 20% and 18% of the annual nitrogen and phosphorus incorporation, respectively. The relative deficiency of nitrogen and phosphorus differed among sites, with the highest response found in P-deficient meadows Nutnent limitation of p oceanica meadows was greatest in late spring and summer, but differed greatly in magnitude and nature (nitrogen vs phosphorus) depending on local nutrient regimes.
DescripciónEste artículo contiene 7 páginas, 5 figuras.
Versión del editorhttp://www.int-res.com/abstracts/meps/v146/p155-161/
URIhttp://hdl.handle.net/10261/150048
ISSN0171-8630
E-ISSN1616-1599
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