Bibliothèque Tour du Valat

Se connecter

Mot de passe oublié ?
Pas encore inscrit ?

La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Détail

Ajouter au panier

Ajouter au panier

Lien vers la notice

Titre :	Pelagic-benthic coupling, food webs, and organic matter degradation in the Chukchi Sea: Insights from sedimentary pigments and stable carbon isotopes
Auteurs :	Nathan D. McTigue, Auteur ; Philip Bucolo, Auteur ; Zhanfei Liu, Auteur ; Kenneth H. Dunton, Auteur
Type de document :	Article
Dans :	Limnology and Oceanography (60(2) MAR 2015)
Article en page(s) :	429-445
Résumé :	An understanding of the origin and fate of organic matter deposited on the seabed in the Chukchi Sea is critical to our understanding of how regional changes in climate will affect this highly productive ecosystem. We measured the concentrations of chlorophyll a, pheopigments, and accessory pigments in sediments at 39 stations using high-performance liquid chromatography (HPLC) to investigate the degradation pathways of chlorophyll-containing organic matter. Chlorophyll a concentrations were among the highest ever reported in marine sediments (up to 665 mg m(-2)). Measurements of pheopigments, including pheophytin a, pheophorbide a, and pyropheophorbide a, revealed substantial degradative processing of organic matter that began similar to 2 weeks after ice breakup. However, the ratio of chlorophyll a to total pheopigments (Chl a : pheo) was > 1 in most stations, indicating that chlorophyll a was preserved despite grazing and senescent degradation pathways that produced accumulated pheopigments. Increased delta C-13 values of bulk sediment organic matter was also positively correlated to concentrations of pheophytin a (p

FAQ

Infos pratiques

Heures d'ouverture et contact

Lundi , mardi et jeudi de 9h à 12h et de 13h à 17h00 : ouverture au public ...

Liens utiles

A-
A
A+