Dataset: iioe_chaetognaths
Deployment: Um_63_24

Chaetognaths recorded during the International Indian OceanExpedition (IIOE) 1960-1965

Principal Investigator:

Vijayalakshmi R. Nair (National Institute of Oceanography, Kochi, India, NIO)

BCO-DMO Data Manager:

Ms Dicky Allison (Woods Hole Oceanographic Institution, WHOI)

Project:

International Indian Ocean Expedition (IIOE)

Current State:

Final no updates expected

Version Date:

2010-11-19

Data URL:

https://www.bco-dmo.org/dataset-deployment/451901/data

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Description

'Zooplankton samples collected during International Indian Ocean Expedition (IIOE) 1960-65 are by far the largest and the most important collections from the Indian Ocean in the world today. Though several experts spent decades to study various groups of zooplankton, these valuable data have not been computerized to make permanent records. Hence a database for IIOE zooplankton is initiated as a cooperative project of CMarZ and a part of the IIOE data have been digitized.

During IIOE 1548 standard zooplankton samples were collected covering the entire Indian Ocean. The database is prepared based on published information on these zooplankton samples. Three sets of Tables are made (1) Basic data on zooplankton volume, total population and all the 54 taxa found in the collections. (2) Data emerged from subsorting of copepods, decapods and fish larvae (3) Species level data for chaetognaths for entire Indian Ocean and ostracods for northern Indian Ocean.' (from summary of CMarZ Cooperative Project final report)

Related objects: iioe_zoo and iioe_zoo_other

Enormous amount of data emerged through IIOE collections (25 °N to 45°S latitude and 30 to 120°E longitude) had been digitized to make permanent records of the zooplankton of the Indian Ocean (Nair, 2005). The proposed baseline biodiversity assessment of CMarZ has a critical application for ocean research to provide a benchmark against which future comparisons can be made. The first step towards this endeavour would be to digitize the recorded species from different sectors of the world oceans along with their biogeography. This project aims to bring out inventories for the known species of major groups of zooplankton of the Indian Ocean. This information can be incorporated into CMarZ species page, an endeavour to enhance capacity in zooplankton taxonomic analyses.

Although technically retired, Vijaya Nair remains the contact for anyone seeking information about these data.

Contact information:
Vijayalakshmi R. Nair
HB/50, Vijaya
South Bridge Avenue, Panampilly Nagar
Kochi 682036, Kerala, India
(telephone/fax) 00-91-484-2316999
vijayalakshmi40@hotmail.com

Methods & Sampling

Dataset acquisition description

"It was recommended that each research vessel, every night between 2200 and 0200 hours local time, take one vertical haul from 200m to the surface, hauling in the net at a speed of 1 m/sec. The samples were then to be preserved in 10% formalin neutralized with hexamethylenetetramine. The displacement volume of the catch [was], if possible, measured at the earliest opportunity by an accepted method. The samples were then sent to the Sorting Centre for further processing. Many vessels took duplicate hauls, one for the Centre and one for the use of individual scientists in their respective countries." (Hansen, 1966).

Inventory is based on materials collected during IIOE and later collections made by NIO and other Institutions along the coastal and oceanic realms of the Indian Ocean.

Data Processing Description

Dataset Processing Description

Thirty one species of chaetognaths belonging to the genera Eukronia, Krohnitta, Pterosagitta and Sagitta are found in the Indian Ocean. Among the recorded species, twenty are epipelagic, seven mesopelagic and four bathypelagic. Two new species were obtained from Laccadive atolls. Four species are endemic to the Indian waters. The species composition indicates the predominance of tropical Indo-Pacific elements in the fauna. Sagitta enflata and S. decipiens are the respective dominant species at the epipelagic and mesopelagic strata. Eukronia fowleri dominated the bathypelagic realm of the northern Indian Ocean and is replaced by E. hamata in the subtropical waters (Vijayalakshmi, 2001).

More information about this dataset deployment

Instruments

Indian Ocean Standard Net

Supplied Description:

Instrument Type

Generic Name: Indian Ocean Standard Net

Acronym: I.O. Standard Net

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/NETT0075/

Generic Description:

The Indian Ocean Standard Net was designed specifically for the International Indian Ocean Exploration project. The net has a mouth area of one square meter and a total length of 5 meters. The net is made of nylon gauze with a mesh size of .333 mm (330um).

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
reference	master reference number of sample		sample
species	common name of group		species
count	number of individuals counted	number per standard haul	number
year	year of collection		year
platform	ship designation		platform
vessel	ship designation		no_bcodmo_term
cruise	cruise number of the particular vessel		cruiseid
station	Station number gives approximate location		station
lat	latitude of tow, North = positive	decimal degrees	lat
lon	longitude tow, East = positive	decimal degrees	lon
date_local	day/month/year		date_local
time_local	Self explanatory		time_local
day_night_flag	D = Day; N = night		no_bcodmo_term
zooplankton_vol	displacement volume of sample	ml	disp_vol
total_organisms	total number of individuals in tow	number per standard haul	no_bcodmo_term
depth_w	Depth of water at this station	meters	depth_w

Database

Contribute Data

Dataset: iioe_chaetognaths
Deployment: Um_63_24

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: iioe_chaetognathsDeployment: Um_63_24

Dataset acquisition description

Dataset Processing Description

Dataset: iioe_chaetognaths
Deployment: Um_63_24