Quantitative video sampling of coral reef benthos: large-scale application
Tóm tắt
The feasibility of reliably estimating percent cover of coral reef benthos by video techniques is examined. Video belt transects were recorded within study areas on Davies and John Brewer Reefs in the central Great Barrier Reef during September 1988. Two years later in September 1990, the study area at Davies Reef was resampled concurrently by video and line intercept transects. Percent cover data of major coral growth forms and non-biotic physionomic attributes were extracted from video footage by scoring the identity of items located at even or random spaced points along the transect. A cost-benefit analysis which compared increases in precision with increases in sampling effort suggested that the optimum regime for analyzing 200 m long video transects was five subsamples of 110 random points or one sample of 550. This regime resolved both spatial variability at large and smaller spatial scales (between study areas and among transects) and temporal change (within a single study area over a two year period) for total live coral and individual growth forms. The strengths of the technique lie in its cost-savings in filed expenses, and in the production of a permanent visual record. The limitations of the technique lie in reduced taxonomic resolution when compared with “hands on” field techniques. The results suggest that for broad taxonomic categories of coral reef benthos reliable estimates of relative abundance can be obtained by video techniques.
Tài liệu tham khảo
Andrew NL, Mapstone BD (1987) Sampling and the description of spatial pattern in marine ecology. Oceanogr Mar Biol Annu Rev 25:39–90
Bros WE, Cowell BC (1987) A technique for optimizing sample size (replication). J Exp Mar Biol Ecol 114 (1):63–71
Dahl AL (1977) Monitoring man's impact on Pacific island reefs. Proc 3rd Int Coral Reef Symp 2:571–575
Day RW, Quinn GP (1989) Comparison of treatments after an analysis of variance in ecology. Ecol Monogr 59(4):433–463
Done TJ (1992a) Effects of tropical cyclone waves on ecological structures on the Great Barrier Reef. Cont Shelf Res 12:859–872
Done TJ (1992b) Constancy and change in some Great Barrier Reef coral communities: 1980–1990. Am Zool 32:655–662
Done TJ, Kenchington TA, Zell LD (1981) Rapid, large area, reef resource surveys using a manta board. Proc 4th Int Coral Reef Symp 1:299–303
DeVantier LM, Barnes GR, Daniel PA, Johnson DB (1985) Assesment protocol (Studies in the assessment of coral reef ecosystems; 1). Australian Institute of Marine Science, Townsville
Fairweather PG (1991) Statistical power and design requirements for environmental monitoring. Aust J Mar Freshwater Res 42(5): 555–567
Fernandez L, Marsh H, Moran PJ, Sinclair D (1990) Bias in manta tow surveys of Acanthaster planci. Coral Reefs 9:155–160
Foster MS, Harrold C, Hardin DD (1991) Point vs photo quadrat estimates of the cover of sessile marine organisms. J Exp Mar Biol Ecol 146(2):193–203
Kenchington RA (1978) Visual surveys of large areas of coral reefs. In: Stoddart DR Johannes RE (eds) Coral reefs: research methods. (Monographs on Oceanographic Methodology 5) Unesco Paris, pp 149–161
Loya Y (1978) Plotless and transect methods. In: Stoddart DR, Johannes RE (eds) Coral reefs: research methods. UNESCO, Paris, pp 197–217
Moran PJ, Bradbury RH, Reichelt RE (1988) Distribution of recent outbreaks of the crown-of-thorns starfish (Acanthaster planci) along the Great Barrier Reef: 1985–1986. Coral Reefs 7(3): 125–137
Moran PJ, Johnson DB, Miller-Smith BA, Mundy CN, Mundy CN Bass DK, Davidson J, Miller IR, Thompson AA (1989) A guide to the Australian Institute of Marine Science manta tow technique. The crown-of-thorns study. Australian Institute of Marine Science, Townsville, Qld
Mundy C (1991) A critical evaluation of the line intercept transect methodology for surveying sessile coral reef benthos. MSc Thesis, James Cook University of North Queensland
Ohlhorst SL, Liddell WD, Taylor RJ, Taylor JM (1988) Evaluation of reef census techniques. Proc 6th Int Coral Reef Symp 2:319–324
Pielou EC (1974) Population and community ecology: principles and methods. Gordon and Breach, New York
Pringle JD (1984) Efficiency estimates for various quadrat sizes used in benthic sampling. Can J Fish Aquat Sci 41(10):1485–1489
Rylaarsdam KW (1983) Life histories and abundance patterns of colonial corals on Jamaican reefs. Mar Ecol Prog Ser 13(2–3): 249–260
Sebens KP, Johnson AS (1991) The effect of water movement on prey capture and distribution of reef corals. Hydrologia 226:91–101
Sokal RR, Rohlf FJ (1981) Biometry: the principles and practice of statistics in biological research, 2nd edn. Freeman, San Francisco
Tomascik T, Sander F (1987) Effects of eutrophication on reef-building corals. 2. Structure of scleractinian coral communities on fringing reefs, Barbados, West Indies. Mar Biol 94(1): 53–75
Veron JEN (1986) Corals of Australia and the Indo-Pacific. Angus and Robertson, Sydney
Williams EH, Bunkley-Williams L (1990) The world-wide coral bleaching cycle and related sources of coral mortality. Atoll Res Bull 335.
Winer BJ (1971) Statistical principles in experimental design, 2nd edn. McGraw-Hill, New York
Zar JH (1984) Biostatistical analysis, 2nd edn. Prentice Hall, New Jersey