MARINE BIOLOGICAL SURVEY OF THE PROPOSED DOCK SITE ...

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13Table 3 . Size distribution, frequency, density. and percentage of substratum covered by stony corals in various zones along Transects 1-4.Re 1 a t he va 1 ues of fr'@Quency. density. and percentage of subs tratum cover~ are also ?iven and an importance va I ue is c.l cu 1a tedtrOll the sum of these three relative values. The procedures for calculating the stat sties In the columns fT'Olll the data obtainedby the point-centered quarter sampling technique are explained In the Methods section. The standard syrrools are used for the numberof data (n), arithmetic mean (Y), standard deviation (5), and range (101)., Size Distributionof coloniesTransect No.!Oh. ;, emlTrans!!::t Zone DensIty Rel.per 100m2 '0 S cov!! r S cover IV••Corals , Y wTransect No. 1Boulder -Rubble ZoneNo corals encounteredl!!h.ll.l!.l-Thalassh ZonePorites aus tra 11 ens is 10 7.8 7.7 1-22 1.0 52.6 122 76.9 1.06 95 . 5 225 . 0Montioora sp. cf. ,!!. ehrenberg1i 1 .3 15.87.7 .02 1.8 25.3Hontioora dharicata 1 .3 15.87.7 1.8 25.3£w:.11n. s p . 1 (massive) 1 .3 15.87.7" .". 9 24.4Overall Oensity 1.58 corals per ~Overall Pert:ent of coverage 1. 11SSand and Coral ZonePorites australiensis 10 13.9 14.3 2-46 1.0 62.5 190 83.3 5.57 92.5 238.3Porites sp. 1 (massive) 1 .3 18.8 19 8.3 .29 '.8 31. 9Porites lobata 1 .3 18.8 19 8.3 .16 2.7 29.8----nYeranOens1ty 2.28 corals per ~Overall Percent of coverage 6.02STransect Ho. 2Boulder-Rubble Zone110 corals encounteredEnhalus-Thalassh Zone~ ~Yil(Alj!:!Uis 6.' 3.0 3-10 .3 42.9 27 83.3 .11 91.7 217 .9Leptutrra ~ .. 57.1 6 16.7 .01 8.3 8?.1Overall Density .33 corals per m2Overall Percent of coverage .12SSand and Cora 1 ZonePorites austral iensis 20 8.7 11.6 3- 55 .0 83.3 64 90.9 1. 02 86.'1 260.6Flontlporasp:(:f. !! ehrcnbergii 1 .1 S.3 J.15 12.7 25.6• .6Porites sn.l (massive) .1 8.3 3• .6 · 01 ., 13.SOverall Density .70 corals per';'Overa II Percent of coverage 1.181Transect No.3Boulder-Rubble ZoneNo corals encounteredEnhalus-Thalassia Zone----,sorites australiensis-----OVerall Density .31 COrals per ~Ove ra 11 Percent of coverage . lOS"6.0 3.1 3-10 .5 100.0 31 100.0 .10 100.0 300 .0Sand and Coral ZonePorites australiensis 28 10.1 7.1 2-33 1.0 62.5 165 80.0 2.06 12.2 214 .7I1Onti~ora sp. d. lil.enrenbe!JIii 1 .1 6.3 6 2. , .54 HL9 28.1Favia mauhai 2 7.5 0.7 7-8 .2 12.55.7 .05 1.3 20.0'P'ii'rTfe~ (massive) 1 .1 6.3 6 " 2. , .17 6.0 15.2~and r ew5i 2 5.0 0.0 5-5 .1 6.3 12 5.7 .02 .7 12.7-Uvera ll Density 2.07 corals per m2Overall Percent of coverage 2.851tTransect No.480ul der-Rubble ZoneNo corals encountered.EnhJ..l..u..i- T!W.lliii. Zone~ jlJ.litU]le;lIiii 33 8.' 5.2 1-22 .8 72.7 65 91.6 .47 87.0 251.3Mrmtjoon .llI.bu.1..i1.l 1 .1 9.1 2 2.8 .05 9.3 21.2flld..W. andr~ si 1 .1 9.1 2 2.8 < .01
14To get some kind of idea what the study site was possibly like beforebeing disturbed a qualitative snorkeling observation was conductedon the opposite lagoon slope and reef-flat platform directly acrossthe channel (Fig. 3) which revealed a coral fauna composed of 44species. If scuba observations were made on deeper parts of thela~oon slope the difference in species composition would probablybe even greater.Macro-invertebrates - The prevalent macro-invertebrates on thereef flat wpre 1aree dpposit-fepding hnlothurians. Although severalspecies of holothurians could be found in each zone (Table 4), eachzone was characterized by different species which were particularlycommon and representative of that zone. The Enhalus-Thalassia Zonewas characterized by clumps of Actinophyga echinites. The Coral andSand Zone was generally characterized by Holothuria eduli~, although~. flavomaculat~ was very common at the seaward edge of the Reef Marginwhich we have included in the Coral and Sand Zone (Table 4). Holothuria!lavomaculata characterized the Reef Slope.Holothuria ~. ~. leucospilota and Stichopus chloronotus werewidespread across the reef flat, but were never common. Holothuriaatra was found out on open sandy areas. Holothuria leucospilota wasunder coral heads and would extend the anterior part of its body outfrom under the coral heads, especially when dusk approached in thelate afternoon. Stichopus chloronotus was found both on sand andcrawling up on head coral formations.Four species in the genus Holothuria were present and showed adistinct pattern of zonation (Table 5). Holothuria atra was mostfrequent at the shoreward edge of the Enhalus-Thalassia Zone.Holothuria edulis was most common at the seaward edge of the EnhalusThalassia Zone and in the Coral and Sand Zone . Holothuria leucospilotawas most common under coral heads on the inner Reef Margin while H.flavomaculata was common under coral heads on the outer Reef Narginand on down the Reef Slope.It is interesting to note that there was no significant differencebetween zones in terms of total abundance of holothurians taken as agroup. Throught the subtidal area of the study site, the mean andstandard error of the mean number of holothurians per 10 m 2 quadrat(n = 72) was 4.6 ± 1.0, or about one holothurian every 2 m2 . Despitethe relative uniformity in abundances, there were six species presentin the Enhalus-Thalassia Zone and seven species present in the Coraland Sand Zone but only two on the Reef Slope (Table 4). Ninety-fivepercent of the holothurians on the Reef Slope were of the one species,H. flavomaculata.Synaptid holothurians were also present in the study area, butthey are generally nocturnal and so they were not sampled.
Page 1 and 2: MARINE BIOLOGICAL SURVEYOF THE PROP
Page 3 and 4: 2I\.).. .......i I '.:'·1'., .....
Page 5 and 6: 4HIGH TIDE HIGH TIDE0LOW TIDELOW TI
Page 7 and 8: 6In order to assess the general pat
Page 9 and 10: -L8Table 1.Continued.SpeciesBoulder
Page 11 and 12: -10sandy substratum. The genus ~oly
Page 13: •12The outermost part of the reef
Page 17 and 18: 14To get some kind of idea what the
Page 19 and 20: 16Table 5 . Number of echinodenns p
Page 21 and 22: 18TRANSECT 1NumberofSpecies"lumbero
Page 23 and 24: -20Table 6.Continued.Boulder Enhalu
Page 25: 22CONCLUSIONS AND RECOMMENDATIONSCl

MARINE BIOLOGICAL SURVEY OF THE PROPOSED DOCK SITE ...

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