MARINE BIOLOGICAL SURVEY OF THE PROPOSED DOCK SITE ...

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Table 2. list of cora Is observed a lonq tne transects of the study area. SyMbols indi cate thei r relativeabundance within the various reef zones: :l ~ uominant, A ~ abundant, C • COII,"on , 0 ~ occasional,R " rare. [I " Enhalus-~ Zone, II • Sand and Coral Zone, III ,. La'loon Sl ope.]11,SUBORDER1Transect Transect Transect Transec tNo.1 No.2 r~o.J :10.4 rjorth Side of Channc:>1nrm nrm nrm nrm Reef rlat lagoon ~lopeCLASS - ArlTllQZOAORDER - SClERACTHHA- ASTROCOE'/I !rIAFAMILY - ASTROCOErHlDA[~tylocoen1ella ~ (Ehrenberg)FAMILY - THAl-1rIASTERIIDAf."PsaJllllOcora WJM~Ja (Esper)Rr~4tLY - potl UA[pocill0oi0ra damicornis (Linnaeus)R 0 0FA.'>1llY - CROPOR!bAEAcronora exi!)ua (Dana)R:croporil. formosa (Dana)C!..Q.E:2..!:! !,.eres Vern 1 I"Astreopora rnyriophthal'"!d (lamarc k) R 0 0~r.a berry 1 Hofflllf!fster 0 0 0 0 0 0IiontjPo.!.a divaricata IIrueQgernannR "~nt Dora sp. cf. M. ~hrenbe.!.9..iJVerrill C 0 C 0 C 0 C 0 C JIiontioora lobuldta Bernanl R 0 0 0 0 0 0 0HOntlpora rnl1 feoora Cross land~J:ontlpor.a tubercul~sa (lamarck) 0 ,Mon_tlpora ~.u~t'~ Bernard 0 0140nl1pora verrucosa (lamarck )RHo_~ sp:-TTPani I late ) R R 0 0 0 0 0 0 R 0~!'tlpora sp. 2 (Pa'llllate ) ,0 R~n~ipo...!:! sp. 3 (Fo~eo1ate ) 0 0 0 0 0SUBDRDE - FUNGII'IAFAMILY - AGARICIIuAEP_a~~d (Pol~astra) ~_enOS_iI (EhrenberQ ) RLt'p~oserls scabrd Vaughan 0 0 0 0~ac!!Y2..~i 5 52!.C lOsa (Dana) R 0Pa.t:!tl.s.erJ.! ~o.sa rLamarck)FA/IILV - FII',r;flIJAff.~ (Heliofurlgia) actinif'p."'li~0 0 ROuoy arid Gdi rlJ r dfuna;;' (DmnJJl\ "~$ (liMite'lIS\FU!lgia t~.e.r)_a_ct.i.~) ~~.h.inata RFNIILV - PORITIDAEGo.~o.r_a. sp. 1 (Rar>lOse )0COnlOpora IOb.J.t! l~i Ine-Edward sand Ita IPJePori tes andrt'ws i Vauqhan ,0 R 0 R \forites aillralit'nsis 0 U U 0 U 0 U D 0 , ,U"POri tes loba·ta j}ana R 0 ,0Po·r·itt'J lutea r~ilne-Edwardsand Haime R RPp!i tes I!IJrraY("SiS. VauQlian R , RPorites sp. 1 maSSlVe ) R \l R 0 0 0 0Porites sp. 2 (r:lIlssive )RPomt's (~aea) iWi!j'dnat'ns is D C~I ... eopoFA al i~i. Hoffl'Jel s te? 0 ,0SUBORD(R - V~FAMILY - fAVIIDA[fa~ia dolnae Verri 11 R ,FiVTa iilatl"haii Vaughan R 0 R 0~av:ra specToS:-a (Dana) 0 0 R 0 0 0Favitt's dcuticol1is (Ortman)Fav i tes me 1 i cerllmTEhrenberfj) R R'(ai/ffes sp:-T R ,RPlatygyra Jamell.i.n.d (EhrenlJerq) R 0~ daedalea (Ellis and SOlander) 011) oastrea hel1opora (lamarck) RLt'rtastrea nrKAEea IOana)RFflltI Y - OCUL ,Galaxt'a fasciclllaris (Linnaeus)0FAM{lY - ~luss!OAELobophyllia costata (Dana)FAMILY - PECTIiITTD7\[Pt'ctinia lactuca (Pallas)CLASS - ~---ORDER - MillEPOR1NAFAmLY - Mlll£PORIDA[Hillepora ~ Forskaal 0R 0TOTAL SPECIES PER REEF ZO~IE 13 3 14 5 4 23 15 3 14 IIlJTOTAL GENERA PER REEF ZONE 6 3 6• , "3 7 2 4 3 II \7TOTAL SPECIES PER TWISECT 1628 23"..TOTAL GENERA PER TRANSECT 7 8 II 10 22TOTAL SPEC 1 ES FOR STUDY AREA VRA:iSECTS 1-4 ) _ 41TOTAL GENERA fOR STUDY AREA ( RAt/SECTS 1-4) _ 11,0
•12The outermost part of the reef-flat platform called the Sandand Coral zone consists of a region dominated by sand-sized sedimentsand scattered to locally abundant, massive, hemispherical shapedPorites colonies. Some of these colonies attain a diameter of ameter or more and up to 80 cm in height. Although coral density,coverage, and species diversity is greater in this zone than for anyother, there is no apparent structural reef development taking place,except for possibly a minor amount at Transect 3 where the outeredge of the reef-flat platform forms a slightly raised topographiclip (Fig. 2). Even though the wide range of coverage measured onthe transects (1.10-6.7~ %, Table 3) reveals the patchy and unevendistribution of corals along the zone there is a general increase incoral density, coverage, and diversity from the inner to outer part.The lagoon slope was not quantitatively analyzed because of thefew corals observed there. In general corals are more abundant alongthe upper slopes where more light and less sedimentation occurs thanalong the lower part, although locally where the slope flattens outto the lagoon floor local aggregations of deeper water species suchas Leptoseris scabra, Alveopora allingi, and Goniopora sp. 1 arefound. It appears that the lagoon slope has been altered by previousdredging and the surface consists of rather unstable rubble and sand.Coral planulae may settle on the larger pieces of more stable rubble,but as they increase in size, these colonies would tend to slumpquite easily downslope to more unfavorable growing conditions.Observations on the upper lagoon slope revealed that except for smallsized colonies most corals were aggregated where uncommon exposuresof more stable large blocks and boulders were exposed.A total of 17 genera and 41 sp"cies of reef-huilding cnralswpre found within the study region enclosed by the area betweenTransects 1 and 4 (Fig. 1). Compared to the rich fauna (over 100species) observed along the reef-flat platforms near the outer partof Tomil Harbor Channel the coral fauna at this study site is ratherdepauperate. An earlier study, conducted near the present study sitea few kilometer to the southeast at Donitsch Island, revealed a somewhatintermed1ate coral tauna composed of 31 genera and 81 species(Amesbury et al., 1976). This attenuation of coral species alongthe length of Tomil Channel is for the most part caused by a generaldeterioration of the more optimum conditions for coral growth foundnear the mouth of the channel toward its head near the study area.Because of the close proximity of land and surface drainage at thestudy area, the water is conSiderably more turbid and the accumulationof silt on the reef ~urface greater than at rpef areas loca~edfart"her se~ward. PreViOl)S distllrbance at the stuny site by dredging,land filling, and construction has also influenced the coralcommunity to an undetermined degree. It is suspected that the pres~ntlagoon slupe is particular and parts of the reef-tlat platform aredepauperate (16-23 species, Table 2) because of previous dredging.
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: -10sandy substratum. The genus ~oly
Page 15 and 16: 14To get some kind of idea what the
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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