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A Preliminary Quantitative Survey of the Echinoid Fauna of Kealakekua and Honaunau Bays, Hawaii' THOMAS A

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A Preliminary Quantitative Survey of the Echinoid Fauna of Kealakekua and Honaunau Bays, Hawaii' THOMAS A A Preliminary Quantitative Survey of the Echinoid Fauna of Kealakekua and Honaunau Bays, Hawaii' THOMAS A. EBERT2 DURING 8 DAYS in early August and October, author; in October, the team consisted of E. 1968, the members of an expedition from the Brecknock and D. Kelso. University of Hawaii examined the distribution and abundance of sea urchins in two bays along ORGANISMS the Kona (leeward) Coast of the Island of Hawaii (Fig. 1) : Kealakekua Bay (19 0 28' N; Edmondson (1946) lists 14 regular urchins 155 0 55' W) and Honaunau Bay (19 0 25' N ; found as members of shallow-water benthic as­ 155 0 55' W). The major sampling effort was semblages in Hawaiian waters. Eleven of these expended in Kealakekua, the larger of the two were found in Kealakekua and Honaunau bays bays. The expedition was part of a program to and are listed below. The classification of Hy­ survey the biota of Kealakekua. Information man (1955) is used. gathered from this survey will form a baseline Order Cidaroidea for assessing changes that may be brought about Family Cidaridae by the activities of tourists and shoreline resi­ Chondrocidaris gigantea A. Agassiz dents. At the present time, there is a small vil­ Eucidaris metularia (Lamarck) lage on Kealakekua (Napoopoo) plus a small Order Diadematoidea number of homes at the middle and south ends Family Diadematidae of the bay. The north end, by Captain Cook Diadema pa1lcispina A. Agassiz Monument, is uninhabited. At Honaunau Bay Echinothrix calamaris (Pallas) there is a small village, Honaunau, and the E. diadema (Linnaeus) City of Refuge National Historical Park. Bay­ Family Toxopneustidae related activities of people resident along the Tripn enstes gratilla (Linnaeus) shorelines are fishing, principally with nets and Family Echinometridae handlines, and domestic-waste pollution. Some Colobocentratus atratus (Linnaeus) sea urchins are taken for food, but not in great Ecbinometrn matbaei (de Blainville) numbers. Tourist activities include the collec­ E. obionga (de Blainville) tion of slate-pencil sea urchins (Heterocentrotus Ecbinostrepbus adculatus A. Agassiz mamm illattls) for their spines and the removal Heterocentrotus mammillatus (Lin- of snails and small coral heads. Tourists appear naeus) to be concentrated in Kealakekua Bay at Kaa­ waloa Cove by Captain Cook Monument. Boats bring visitors from Kailua-Kona and, during the METHODS summer months, make two trips per day carry­ ing up to 120 passengers per trip. Honaunau has Five areas were examined within Kealakekua no tourist boats and so possibly is not used as Bay, and single sites were selected within extensively. The area near Cook's Monument Honaunau Bay and 1 mile south of Honaunau was selected for intensive sampling because of (Fig. 1) . From north to south, the sampling the high tourist density. areas will be called: Napoopoo Light, Kaawaloa The August survey party consisted of Dr. J. Cove, Napoopoo Breakwater, Ashihara Cottage, Branham, E. Brecknock, J. McVey, and the Palemano Point, Honaunau Bay, and 1 mile south of Honaunau. Urchin densities in Kealakekua were antici­ 1 Manuscript received July 1, 1970. 2 Department of Biology, San Diego State College, pated to be less than one animal per square San Diego, California 92115. meter. A plotless method of sampling was 112 Survey of Echinoid Fauna-THoMAS A. EBERT 113 DIKr .:':E.. POIN T .1 km. F IG. 1. Outl ine of Kealakekua and Honaunau bays, indicating their position in the Hawaiian chain. selected, rather than quadrats, because I felt that allowed the swivel to move freely around the an appropriate quadrat with such densities stud. A 50-foot stainless steel tape was at­ would be so large that it would be cumbersome tached to the snap. In each quadrant, a diver for divers, or would have to be constructed at measured to the nearest sea urchin and recorded each sampling site. The quarter method of both distance and species. Data were written on forest sampling (Cottom and Curtis, 1956) was white plastic slates. The plastic is distributed by modified for underwater use by divers with Transparent Products Corporation (1727-43 W. SCUBA. A concrete block or smooth lava stone Pico Boulevard, Los Angeles, California 90015) weighing about 7 kg was used as the body of as no. VS-5300-08 pp, matte surface on both the sampling device. A cross of orange Glolite sides, and 0.02" thick. It is available in 20" X tape (such as used by construction survey teams) 40" sheets that are easily cut. Three divers were was attached to the block either with epoxy glue used, and generally each was able to measure or small concrete-studs. A threaded stud was between eight and 13 points per dive. Initial driven into the center of the cross and a snap­ points were haphazardly selected at the deepest swivel placed over the stud. A nut and washer portion of the transect. Divers were taken by prevented the swivel from coming off, but still boat or swam to the area above the deepest 114 PACIFIC SCIENCE, Vol. 25, January 1971 portion of the transect. Each diver was then not included in the quarter method of sampling given a concrete block and the first point was in August, but were included in the quadrat wherever he landed on the bottom. Subsequent counts. points were taken along a line towards shore at In analyzing urchin distribution and abun­ 20- to 25-foot (7- to 8-meter) intervals. dance, several parameters were estimated, which Densities were calculated by first summing all were also used in a phytosociological description the individual distances without regard to spe­ (Curtis and Mcintosh, 1950, 1951) . These cies, determining the mean distance, standard parameters are defined as: deviation, and standard error, and converting Relative freqltency number of occurrences these into meters. The mean distance was then = of one species as a percentage of the total num­ squared, and used to estimate the mean area con­ ber of occurrences of all species. taining one urchin. Confidence intervals were Relative density = number of individuals of set by adding or subtracting one standard error one species as a percentage of the total number from the mean and redetermin ing the mean of individuals of all species. area by squaring the result. Th is procedure is Relative weight = total wet weight of one similar to handling data on which a square-root species as a percentage of the total wet weight. transformation has been performed (Sokol and Rohlf, 1969) . For example, the mean distance These relative values will be used to compare off the breakwater at N apoopoo was 7.56 -t- .69 the species composition of different areas, and feet. are descriptive additions to the estimates of 7.56 ± .69 ft X 0.3048 m/ft =2.30 ± .21 meters absolute density (number of individuals per 2.302 = 5.29-the mean distance squared square meter) . ( 2.30 + .21) 2 = 6.30-the mean plus 1 SE squared Relative frequency and density were deter­ (2 .30 - .21) 2 = 4.37- the mean minus 1 SE mined directly from the quadrat counts or from squared the points of the quarter method; however, be­ The reciprocals of each of these squares give cause individuals were not weighed when an estimate of the mean number of animals per counted, certain calculations were required to square meter plus or minus 1 SE of the mean of estimate weight. Animals were collected at the distance measurements. several locations to determine the size structure 1/5.29 =.19- the mean of the populations. A sample (generally about 1/6.30 = .16 100 individuals) was taken by collecting as 1/4.37 = .23 many animals from one location as possible. It x= .19 + .4 or - .03 animals per square meter must be stressed that the size distributions rep­ The number of each species per square meter resent animals exposed enough to be seen by a was calculated by multiplying the total density swimmer. This obviously introduces a bias in by the relative densities of the species. Relative favor of large individuals, and animals under density is defined as the number of a given 1 em were probably inadequately sampled, al­ species divided by total number of individuals in though the diver efficiency indicated by Larsson the sample. For a further discussion of the (1968) may mean that sampling was not ade­ quarter method, see Cottom and Curtis (1956). quate even for animals as large as 4 em. The initial August survey indicated higher Size distributions (Figs. 2 and 3) were con­ densities than anticipated, so sampling in Octo­ structed for H eterocentrotus, Ecbinotbrix cala­ ber was done with I-meter-square quadrats. maris, and Diadema in Kaawaloa Cove, for Sampling was initiated as in quarter-method Tripnenstes at Palemano Point, and for H etero­ sampling. The quadrat for the first sample was centrotus at Honaunau Bay. Because Ecblno­ placed at the greatest depth; the next sample metra lives in holes in the coral and is generally was taken by simply turning the quadrat over, difficult to extract, the sampling technique for thus advancing 1 meter up the slope. Th e result this species was different from that used for was a set of quadrats forming a I-meter-wide the other urchins. Individuals were measured in band transect from deep water to the shore. place in a series of I -meter quadrats in the Ecbinometra sp. and Colobocentrotus were corner of Kaawaloa Cove. The urchins were Survey of Echinoid Fauna-THoMAS A. EBERT 115 up of spines in a small animal, and relatively ECH INOTHRIX CALAMERIS N ·94 30 CAPTAIN COOK'S MON UMENT less in a large individual. The opposite is true for H eterocentrotus, wher e small individuals 20 have relatively less of their total weight made up by spines than do large individuals.
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