Abundance and photosynthetic characteristics of trichodesmium spp. along the Atlantic barrier reef at carrie bow cay, belize / Villareal, T. A.

Public ISBD Faire une suggestion d'achat Titre : Abundance and photosynthetic characteristics of trichodesmium spp. along the Atlantic barrier reef at carrie bow cay, belize Type de document : texte imprimé Auteurs : Villareal, T. A., Auteur Importance : pp. 259-271 Langues : Anglais (eng) Index. décimale : 577 Ecologie Résumé : Trichodesmium abundance and photosynthetic rates were determined across a transect of the Atlantic Barrier Reef at Carrie Bow Cay, Belize in May 1993 and May-June 1994. A fore reef station receiving oceanic water had a Trichodesmium abundance characteristic of the open Caribbean Sea 10 colonies-m- 3 and 10 4-10 5 trichomes'm-3). Several species were present; however, in all cases a sharp decrease in abundance occurred across the reef to the coastal lagoon. At this latter site, virtually no Trichodesmium was present, although a substantial bloom of the diatom Prohoscia alala occurred in 1994. Maximum photosynthetic rates and the initial light-limited slope a were significantly lower in offshore stations than in reef top populations. The increased photosynthetic rates and light-harvesting ability in reef-top populations, as well as the lack of significant photoinhibition, indicated that the Trichodesmium abundance decrease was probably not due to a decline in photosynthetic capacity. Grazing and physical removal rather than a physiological decline were likely mechanisms operating to reduce Trichodesmium abundance in these regions. These data suggest that theBelizean barrier reef is a sink for Trichodesmium transported in from offshore regions. Abundance and photosynthetic characteristics of trichodesmium spp. along the Atlantic barrier reef at carrie bow cay, belize [texte imprimé] / Villareal, T. A., Auteur . - [s.d.] . - pp. 259-271. Langues : Anglais (eng) Index. décimale : 577 Ecologie Résumé : Trichodesmium abundance and photosynthetic rates were determined across a transect of the Atlantic Barrier Reef at Carrie Bow Cay, Belize in May 1993 and May-June 1994. A fore reef station receiving oceanic water had a Trichodesmium abundance characteristic of the open Caribbean Sea 10 colonies-m- 3 and 10 4-10 5 trichomes'm-3). Several species were present; however, in all cases a sharp decrease in abundance occurred across the reef to the coastal lagoon. At this latter site, virtually no Trichodesmium was present, although a substantial bloom of the diatom Prohoscia alala occurred in 1994. Maximum photosynthetic rates and the initial light-limited slope a were significantly lower in offshore stations than in reef top populations. The increased photosynthetic rates and light-harvesting ability in reef-top populations, as well as the lack of significant photoinhibition, indicated that the Trichodesmium abundance decrease was probably not due to a decline in photosynthetic capacity. Grazing and physical removal rather than a physiological decline were likely mechanisms operating to reduce Trichodesmium abundance in these regions. These data suggest that theBelizean barrier reef is a sink for Trichodesmium transported in from offshore regions.

Exemplaires(0)

Disponibilité
aucun exemplaire

---

1 (1 - 1 / 1) Par page : 25 50 100 200