This study assesses patterns of biogenic carbonate sediment production associated with three different reef and reef-related settings at Danjugan Island in the Philippines. Sediments were collected along transects on windward and leeward sides of the island (1–28-m depth) and from a semirestricted lagoon (1.5–2.5-m depth). Sediment assemblages from all sites are dominated (in decreasing order of abundance) by coral (29.1%), Halimeda (28.8%), mollusks (13.5%), and benthic foraminifera (10.2%). Sediments from windward sites are dominated by fragments of corals (15.0–42.5%), Halimeda (14.0–32.1%), mollusks (8.5–21.6%), and benthic foraminifera (7.8–32.9%). Bryozoans represent a significant secondary component (2.77–14.6%). Leeward sediments primarily comprise coral, Halimeda, and molluscan grains, although are characterized by a higher abundance of Halimeda (29.7–49.2%) than the windward transect. Lagoon sediments comprise primarily coral (1.3–42.7%) and Halimeda (13.8–37.2%) in the outer lagoon, but a high proportion (29.8–61.8%) of fine-grained unidentified detrital (probably terrestrially derived) material at inner lagoon areas. Across each transect, sediment compositional and textural characteristics exhibit marked bathymetric variations. Coral, Halimeda, benthic foraminifera, and mollusks dominate windward and leeward reef flats, whereas coral and Halimeda dominate deeper reef-slope settings. Mean grain size generally decreases with depth and sorting increases with depth. Multivariate analysis of percentage similarity delineate the following facies groupings; windward and leeward reef slopes, windward and leeward reef flats, and inner and outer lagoon. These assemblages are likely to reflect not only rates of production by individual sediment contributors but also subsequent physical reworking of grains and the preferential transport of more buoyant sediment particles.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 2006 • No. 224