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The loss of seagrasses in cockburn sound western australia 1. the time course and magnitude of seagrass decline in relation to industrial development


, : The loss of seagrasses in cockburn sound western australia 1. the time course and magnitude of seagrass decline in relation to industrial development. Aquatic Botany 20(3-4): 229-244

The areas of seagrass meadows in Cockburn Sound, a marine embayment in Western Australia, were estimated from historical aerial photographs supplemented by ground surveys, studies on meadows in adjoining areas and coring for rhizome remains. Ten species of seagrasses [Posidonia sinuosa, P. australis, P. coriacea, P. angustifolia, Syringodium isoetifolium, Amphibolis antarctica, A. griffithii, Halophila ovalis, H. decipiens, Heterozostera tasmanica] with different habitat tolerances are recorded for the area, with P. sinuosa Cambridge et Kuo forming the most extensive meadows. From 1954-1978, the meadow area was reduced from some 4200 to 900 ha. Based on measurements of aboveground productivity at several sites, this represents a reduction of leaf detritus production from 23,000 to 4000 t (dry wt) yr-1. The major loss of seagrass occurred during a period of industrial development on the shore, and during the discharge of effluents rich in plant nutrients.


Accession: 006712171

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Related references

Cambridge, M.L.; Chiffings, A.W.; Brittan, C.; Moore, L.; Mccomb, A.J., 1986: The loss of seagrass in cockburn sound western australia ii. possible causes of seagrass decline. This paper examines possible reasons for the extensive loss of seagrass in Cockburn Sound following industrial development. Transplanted seedlings survived poorly in Cockburn Sound compared with an adjoining embayment. Altered temperature, salinit...

Silberstein, K.; Chiffings, A.W.; Mccomb, A.J., 1986: The loss of seagrass in cockburn sound western australia iii. the effect of epiphytes on productivity of posidonia australis. The hypothesis was examined that increased epiphyte growth was responsible for a reduction in seagrass meadows in Cockburn Sound during the discharge of nutrient-rich effluent. One study site was in a deteriorating meadow near an effluent outfall,...

Kendrick, G.A.; Aylward, M.J.; Hegge, B.J.; Cambridge, M.L.; Hillman, K.; Wyllie, A.; Lord, D.A., 2002: Changes in seagrass coverage in Cockburn Sound, Western Australia between 1967 and 1999. Changes in seagrass coverage in Cockburn Sound from 1967 to 1999 were assessed from aerial photographs using modern mapping methods with the aim of accurately determining the magnitude of change in hectares of seagrasses between 1967 and 1999 and...

Lemmens, J.W.T.J.; Clapin, G.; Lavery, P.; Cary, J., 1996: Filtering capacity of seagrass meadows and other habitats of Cockburn Sound, Western Australia. Macro-suspension-feeders (predominantly ascidians, sponges, bivalves) and epifaunal suspension-feeders (hydroids, spirorbids, bryozoans, barnacles, amphipods) in Posidonia meadows of Cockburn Sound, Western Australia, demonstrate a clear spatial d...

Chiffings A.W.; Cambridge M.L.; Silberstein K.; Mccomb A.J., 1981: Replacement of seagrass communities by phyto plankton in cockburn sound a shallow marine embayment in western australia. Proceedings of the International Botanical Congress 13: 336

Paling, E., I.; Van-Keulen, M.; Tunbridge, D., J., 2007: Seagrass transplanting in Cockburn Sound, Western Australia: A comparison of manual transplantation methodology using Posidonia sinuosa Cambridge et Kuo. Seagrass transplants (plant units [PUs]) were established to examine the feasibility of seagrass rehabilitation in Cockburn Sound, Western Australia. Five hundred and twenty plant units (plugs and sprigs) of Posidonia sinuosa Cambridge et Kuo wer...

Rosman K.J.R.; D.L.eter J.R.; Chegwidden A., 1980: Distribution of cadmium in cockburn sound western australia. The stable isotope technique was used to measure the distribution of Cd in Cockburn Sound, a sheltered body of water south of the port of Fremantle, Western Australia. Water samples were collected from 50 positions in Cockburn Sound and the open o...

Alexander R.; Cumbers M.; Kagi R.; Offer M.; Taylor R., 1981: Petroleum contamination of Cockburn Sound, Western Australia. Current Topics in Environmental and Toxicological Chemistry 5: 273-297

Wells, FE.; Threlfall, TJ., 1980: A survey of the softbottom molluscs of Cockburn Sound, Western Australia. Stations (30) in Cockburn Sound, Western Australia were sampled in triplicate with a 0.1 m2 Van Veen grab. Mollusks were the dominant organisms, constituting 72.19% of all individuals and 89.56% of the biomass. An area of high density and biomass...

Anonymous., 1970: Conservation of Cockburn Sound (Western Australia).Marine life. Spec Aust. Conserv. Fdn: 11-13