Ecological effects of an artificial island, Rincon Island, Punta Gorda, California ecologicaleffect00john Year: 1978 (7) The series of triangles was then placed in perspective by con- verting the distance between measurements (d^) to a distance times d^. The conversion allowed a three-dimensional depiction o£ these triangles scaled to the total side of the island. ( = sin of a right triangle = 1/^^) 2. Permanent Transects Seasonal Data Analysis Methods. The master species list for the seasonal surveys included 250 taxonoraic categories (70 were marine algae and 180 were mari
Ecological effects of an artificial island, Rincon Island, Punta Gorda, California ecologicaleffect00john Year: 1978 (7) The series of triangles was then placed in perspective by con- verting the distance between measurements (d^) to a distance times d^. The conversion allowed a three-dimensional depiction o£ these triangles scaled to the total side of the island. ( = sin of a right triangle = 1/^^) 2. Permanent Transects Seasonal Data Analysis Methods. The master species list for the seasonal surveys included 250 taxonoraic categories (70 were marine algae and 180 were marine in- vertebrate taxa). From this master list 24 taxa of marine algae and 30 taxa of invertebrates were selected for special study of seasonal variability. Proportionately, more algal taxa were used than in- vertebrate taxa, because seasonal effects are often well pronounced among algae, especially reds (Rhodophijta). The only algal taxa omitted from the analysis were those of uncertain identity or which (a) occurred in low density, and (b) were found on only one side and during only one season. The number of invertebrate taxa selected for analysis was in part dictated by data-handling considerations. Even when unidentified taxa were eliminated, the amount of data remaining was formidable. Many of these taxa were observed at such low fre- quencies as to be of little value in any seasonal analysis. Either these species are uncommon on the island; the transects missed their centers of abundance; or, if they were seasonally abundant, their peaks in abundance did not overlap the sampling periods. Many taxa were observed only once (, in only one quadrat). It is assumed that most if not all of the singular-occurrence taxa and most of the low-frequency taxa were generally uncommon on the island. Observa- tions elsewhere on the island during other times of the year (, during reconnaissance diving, measurement of boundaries of associa- tions, and biomass measurements) tend to
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