Species point records from 1978 NCC Loch Obisary survey
A preliminary survey was made of Loch Obisary, the largest brackish water loch in North Uist, Outer Hebrides. The loch has a single narrow connection to the sea, through which sea water enters at high tides. Salinity, temperature and depth measurements were taken throughout the loch and revealed the presence of a distinct halocline and thermocline in the north basin of the loch at about 4 m depth, neither of which were present in the south basin. The salinity of the water above the halocline in the north basin and throughout the south basin was 13 - 14 ppt whilst that below the halocline had a maximum of 28.5 ppt. Temperature decreased by approximately 1 degree Centigrade at the level of the halocline and rose again by approximately 0.5 degree Centigrade near the bottom of the loch. The flora and fauna were investigated both by diving and by shore collections. Two distinct communities of plants and animals were found in the loch: i) A 'freshwater ' marginal component consisting of freshwater euryhaline species and true brackish water species found above the halocline in the north basin and throughout the south basin of the loch. ii) A marine component consisting of marine euryhaline species numerically dominated by the red alga Phyllophora pseudoceranoides and the tunicates Ciona intestinalis and Ascidiella aspersa. Comparisons are made with other studies of brackish lochs and waters and it is concluded that Loch Obisary is an interesting and unusual example of this scarce habitat type.
dataset
http://data.jncc.gov.uk/data/0a2495e7-6ebf-4883-a5f3-2e3ab7b69dd8-1978-NCC-Loch-Obisary-survey.csv
name: 1978-NCC-Loch-Obisary-survey.csv
0a2495e7-6ebf-4883-a5f3-2e3ab7b69dd8
eng
Mitchell, Dipper, Earll, Rowe (1980) Loch Obisary: a preliminary survey
oceans
Marine
Marine Recorder
JNCCMNCR10000200
MNCR
Species
-7.229043798
-7.152251725
57.56071656
57.51255964
1978-05-01
1978-05-28
publication
2001-08-29
This survey was extracted from a Marine Recorder snapshot.
Comma Separated Values
Unknown
Open Government Licence v3.0
no limitations
Digital and Data Solutions, JNCC
custodian
Digital and Data Solutions, JNCC
pointOfContact
2018-05-17