| Contributors | Affiliation | Role |
|---|---|---|
| Wiebe, Peter H. | Woods Hole Oceanographic Institution (WHOI) | Principal Investigator |
| Copley, Nancy | Woods Hole Oceanographic Institution (WHOI) | Technician, BCO-DMO Data Manager |
Zooplankton from the Guaymas Basin deep-sea vent field were collected with a 1 m^2 MOCNESS to examine the distribution of total standing stock, taxonomic composition, size-frequency distribution of zooplankton, and the species composition of calanoid copepods. Low altitude ( similar to 100 m above the bottom) horizontal tows along and across the axis of the basin's southern trough, and oblique tows from the bottom of the basin ( similar to 2000 m) to the surface were made. Total biomass in near-bottom samples (range: 13-46 cc/1000 m^3) was only about a factor of 10 lower than in the upper 100 m. Of the 67 species of copepods identified in two samples taken on low altitude tows, only 15 occurred in both samples. Many of the species in this relatively diverse community remain to be described. Larval and post-larval forms of benthic clams, gastropods, polychaetes, and crustaceans associated with the vents were collected 100-200 m above the southern trough, indicating the post-larvae may play an active role in dispersal of hydrothermal vent species.
MOC‑GY‑3 and MOC‑GY‑7 were both horizontal MOCNESS tows, with MOC-GY-3 passing down the length of the vent trough and MOC-GY-7 cutting across it. On each tow, eight samples were collected. Copepods in one sample from each of the tows were identified for this report. MOC-GY-3, sample 4 was selected for enumeration of all copepod individuals because it was a collection taken nearly at the middle of the hydrothermal vent field. MOC-GY-7, sample 7 was selected because it was furthest away from the vent field. Lack of funds prevented the analysis of other samples. Alvin dive 1629 was at a vent patch under the path of MOC-GY-3. Only a small portion of the sample was examined.
Relevant References:
Drawings and descriptions of some deep-sea copepods living above the Guaymas Basin hydrothermal vent field.
Copley, N J; Wiebe, PH; Woods Hole Oceanographic Inst., MA (USA). Technical Rpt. WHOI-90-15.
Deep-water zooplankton of the Guaymas Basin hydrothermal vent field.
Wiebe, PH; Copley, N; Van Dover, C; Tamse, A; Manrique, F. Deep-Sea Research35.6A (1988): 985-1013.
| File |
|---|
guaymas_copepods.csv (Comma Separated Values (.csv), 33.91 KB) MD5:9f760cecc28c01a7bafab5fdc70debcf Primary data file for dataset ID 473670 |
| Parameter | Description | Units |
| cruise_id | cruise identification | unitless |
| date | date; local time | YYYYMMDD |
| time | local time | HHMM |
| lat | latitude; north is positive | decimal degrees |
| lon | longitude; east is positive | decimal degrees |
| tow | tow number | unitless |
| net | net number | integer |
| depth_min | minimum depth of sample | meters |
| depth_max | maximum depth of sample | meters |
| species | species | text |
| sex | sex or stage: M=male; F=female; C=copepodite; MFC=all stages | text |
| abundance | abundance | number per 1000 meter^3 |
| comments | comments; * indicates that the abundance is not included in total species counts | text |
| Dataset-specific Instrument Name | MOC1 |
| Generic Instrument Name | MOCNESS1 |
| Dataset-specific Description | 333 micron mesh, 9 nets |
| Generic Instrument Description | The Multiple Opening/Closing Net and Environmental Sensing System or MOCNESS is a family of net systems based on the Tucker Trawl principle. The MOCNESS-1 carries nine 1-m2 nets usually of 335 micrometer mesh and is intended for use with the macrozooplankton. All nets are black to reduce contrast with the background. A motor/toggle release assembly is mounted on the top portion of the frame and stainless steel cables with swaged fittings are used to attach the net bar to the toggle release. A stepping motor in a pressure compensated case filled with oil turns the escapement crankshaft of the toggle release which sequentially releases the nets to an open then closed position on command from the surface. -- from the MOCNESS Operations Manual (1999 + 2003). |
| Website | |
| Platform | R/V Atlantis II |
| Report | |
| Start Date | 1985-07-24 |
| End Date | 1985-08-03 |
| Description | Zooplankton from the Guaymas Basin deep-sea vent field were collected with a 1 m^2 MOCNESS to examine the distribution of total standing stock, taxonomic composition, size-frequency distribution of zooplankton, and the species composition of calanoid copepods. |
Description not available.
| Funding Source | Award |
|---|---|
| NSF Division of Ocean Sciences (NSF OCE) | |
| NSF Division of Ocean Sciences (NSF OCE) |