Abstract
Submarine canyons may be particularly important in the transport process of drift seagrasses and seaweeds from highly productive shallow lagoon areas to deeper water. We studied the composition, export, and faunal utilization of shallow, nearshore benthic vegetation as it was transported to offshore areas via the Salt River submarine canyon on the island of St Croix, U.S. Virgin Islands. The study was conducted using a saturation diving system (NULS-1: Hydrolab) during two missions in April and August, 1980. Using bottom drifters deployed in Salt River Bay and the submarine canyon, we recorded net benthic current flow up to 2 cm s-1 moving out of the lagoon and down the canyon to deeper water. Using bottom nets set up at the canyon head and at the 29 m isobar, and from transect surveys and drift clump samples, we determined drift plant export rates and drift clump biomass and species composition. The dominant drift plants were Thalassia testudinum and Syringodium filiforme and algae in the genera Dictyota, Dictyopterus, and Diloplus. During the second mission, the seagrass Halophila decipiens became more abundant, both in the drift and in large patches along the canyon floor. In both missions, more drift was collected in the nets during high wind conditions than during calmer days. Calculated turnover times ranged from 0·01 to 4·4 days for algae in the order Dictyotales and 4·4 to 18 days for Thalassia blades. Total exported biomass of drift vegetation varied between 1·4 to 65·1 kg wet wt day-1. Samples of drift vegetation contained mostly juvenile forms of both invertebrates and fishes, but in relatively low numbers. Faunal numbers were most strongly related to rate of drift movement.
| Original language | English |
|---|---|
| Pages (from-to) | 447-465 |
| Number of pages | 19 |
| Journal | Estuarine, Coastal and Shelf Science |
| Volume | 17 |
| Issue number | 4 |
| DOIs | |
| State | Published - Jan 1 1983 |
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Keywords
- algae
- Caribbean sea
- detritus
- drift
- sea grasses
- submarine canyons
ASJC Scopus subject areas
- Aquatic Science
- Oceanography
- Environmental Science(all)
- Earth and Planetary Sciences(all)
Cite this
Composition, export and faunal utilization of drift vegetation in the salt river submarine canyon. / Josselyn, Michael N.; Cailliet, Gregor M.; Niesen, Thomas M.; Cowen, Robert; Hurley, Ann C.; Connor, Judith; Hawes, Sandra.
In: Estuarine, Coastal and Shelf Science, Vol. 17, No. 4, 01.01.1983, p. 447-465.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Composition, export and faunal utilization of drift vegetation in the salt river submarine canyon
AU - Josselyn, Michael N.
AU - Cailliet, Gregor M.
AU - Niesen, Thomas M.
AU - Cowen, Robert
AU - Hurley, Ann C.
AU - Connor, Judith
AU - Hawes, Sandra
PY - 1983/1/1
Y1 - 1983/1/1
N2 - Submarine canyons may be particularly important in the transport process of drift seagrasses and seaweeds from highly productive shallow lagoon areas to deeper water. We studied the composition, export, and faunal utilization of shallow, nearshore benthic vegetation as it was transported to offshore areas via the Salt River submarine canyon on the island of St Croix, U.S. Virgin Islands. The study was conducted using a saturation diving system (NULS-1: Hydrolab) during two missions in April and August, 1980. Using bottom drifters deployed in Salt River Bay and the submarine canyon, we recorded net benthic current flow up to 2 cm s-1 moving out of the lagoon and down the canyon to deeper water. Using bottom nets set up at the canyon head and at the 29 m isobar, and from transect surveys and drift clump samples, we determined drift plant export rates and drift clump biomass and species composition. The dominant drift plants were Thalassia testudinum and Syringodium filiforme and algae in the genera Dictyota, Dictyopterus, and Diloplus. During the second mission, the seagrass Halophila decipiens became more abundant, both in the drift and in large patches along the canyon floor. In both missions, more drift was collected in the nets during high wind conditions than during calmer days. Calculated turnover times ranged from 0·01 to 4·4 days for algae in the order Dictyotales and 4·4 to 18 days for Thalassia blades. Total exported biomass of drift vegetation varied between 1·4 to 65·1 kg wet wt day-1. Samples of drift vegetation contained mostly juvenile forms of both invertebrates and fishes, but in relatively low numbers. Faunal numbers were most strongly related to rate of drift movement.
AB - Submarine canyons may be particularly important in the transport process of drift seagrasses and seaweeds from highly productive shallow lagoon areas to deeper water. We studied the composition, export, and faunal utilization of shallow, nearshore benthic vegetation as it was transported to offshore areas via the Salt River submarine canyon on the island of St Croix, U.S. Virgin Islands. The study was conducted using a saturation diving system (NULS-1: Hydrolab) during two missions in April and August, 1980. Using bottom drifters deployed in Salt River Bay and the submarine canyon, we recorded net benthic current flow up to 2 cm s-1 moving out of the lagoon and down the canyon to deeper water. Using bottom nets set up at the canyon head and at the 29 m isobar, and from transect surveys and drift clump samples, we determined drift plant export rates and drift clump biomass and species composition. The dominant drift plants were Thalassia testudinum and Syringodium filiforme and algae in the genera Dictyota, Dictyopterus, and Diloplus. During the second mission, the seagrass Halophila decipiens became more abundant, both in the drift and in large patches along the canyon floor. In both missions, more drift was collected in the nets during high wind conditions than during calmer days. Calculated turnover times ranged from 0·01 to 4·4 days for algae in the order Dictyotales and 4·4 to 18 days for Thalassia blades. Total exported biomass of drift vegetation varied between 1·4 to 65·1 kg wet wt day-1. Samples of drift vegetation contained mostly juvenile forms of both invertebrates and fishes, but in relatively low numbers. Faunal numbers were most strongly related to rate of drift movement.
KW - algae
KW - Caribbean sea
KW - detritus
KW - drift
KW - sea grasses
KW - submarine canyons
UR - http://www.scopus.com/inward/record.url?scp=0020968935&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0020968935&partnerID=8YFLogxK
U2 - 10.1016/0272-7714(83)90129-4
DO - 10.1016/0272-7714(83)90129-4
M3 - Article
VL - 17
SP - 447
EP - 465
JO - Estuarine, Coastal and Shelf Science
JF - Estuarine, Coastal and Shelf Science
SN - 0272-7714
IS - 4
ER -