KHOA HOC CdNG NGHE
ROIMG DO LAUREIVCIA (RHODOPHYTA) Q PHIJ QUOC, KlElM GIAIMG, V I E T IXIAIVl: HIEIM TRAIMG PHAIM B O V A
IMHAIM DIEIM L O A l
Nguydn Tan PhongS Hujnh Van Tiki^, Truong Trpng Ngdn^
T6MTAT
Cac loai rong do thupc chi Laurencia hien co gia tri kinh te cao Tuy nhien, hi^n chua co danh gia cung nhu bao cao ve phan bo va cac thanh phan loai tai Viet Nam. Mtic tteu cua nghien cuu nay la tun hieu hien trang phan bo va thanh phan loai rong bien thuoc chi Laurencia a Phti Quoc. Ket qua nay la ca so ban diu giup danh gia nguon tai nguyen bieo sau nay va cung la n6n tang cho cac nghien cuu sau ban. Nghien cuu nay ip dung phuong phap quadrat d^ thu miu, phuong phap lay mlu phan tich, phuong phap phan loai, danh gia da dang loai va danh gia chi s6 dong deu d^ dat duoc muc Ueu nghien ctju. 8 trong 14 hon dao a Phti Qudc CO su hi&n di^n cua 7 loai rong do thuoc cht Laurencia (Laurencia cartilagmea, Laurencia majuscula, Laurencia mcdermidiae, Laurencia microcladia, Laurencia obtusa, Laurencia pinnata, Laurencia viridis). 4 trong 7 loai nay co gia tn kinh te cao. Chi so da dang cOa cac loai b muc do tmng binh vol cac chi so bi^n dong giira 0,196 va 0,689. Hai loai Laurencia microcladia va Laurencia obtusa cung co tan sd xuat bien cao nhat (79.36%), Trong khi do, chi so dong deu cua cac loai nay tuong ddi cao, tu 0,650 den 1,000. Moi truong sdng cua cac loai nay bi^n nay con tuong ddi nguyfen ven va it bi tac dong do cac hoat dong ciia con nguoi.
Can CO them nhi6u nghien ciiu ve loai nay cung nhu quy hoach phu bop nhim bao tdn va su dung hop ly tai nguyen rong bien tai Phti Qudc.
Ttr kh6a: Laurencia, Phu Quoc, Rhodophyta, tai nguyen rong bien.
1.GI0ITHIBI
Chi Laurencia phan bd rong rai fat nhieu vimg bien tren toan the gioi. Chi nay duge danh gia la mpt tiong nhimg chi da dang nhat thuoc nganh rong do (Saito, 1967; Garbary & Harper, 1998). Nhieu nghito ctm thuong tap trung nghien ctin kha nang san xuat cac hop chat thii cap, tiem nang he sinh thai va duoc pham tu cac loai rong do thupc chi Laurencia (OLveh-ae^a/,2015).
Viing Carribbean la noi co nhimg nghien cuu diu tien v^ loai rong do Laurencia obtusa (Lamouroux, 1813). Ket qua eho fhay rang loat rong do Laurencia obtusa eo chiia nhi&u hop chat moi eo gia tii kinh te eao. Loai nay cung da dupe xae dinh hien trang va khu vuc phan bo b vitng bien nhiet doi va can nhiet doi (Albert, 1987). Taskm va Sukafar (2013) da ghi nhan 7 loai tiiu6e chi Laurenia tat vitng bien oTho Nhi Ky. Palaniveloo & Vairappan (2013)
' Khoa M6i tmong va Bao hp lao dong, Dai hoc Ton Diic Thing
^ Khoa T^i nguyen M5i Uudng, Dai hoc Kien Giang ' Vien NC & PT Cong nghe Sinh hoc, Tnrong Dai hoc Can Tho
Email: [email protected]
N6^G NGHIEP VA PHAT TRIEN NONG THON - KY 2 - THANG 7/2019
da ght nhan sir da dang va chi^m tm the ciia bdn loai thudc chi Laurencia.' Laurencia snackeyi, Laurencia majuscula, Laurencia nangii va Laurencia similis tat bac dao.
Le (2015) bao cao rang rong do tai Vi6t Nam c6 su tuong d6ng v^ da dang loai voi cae loai xuat hifin tai Phihppines nhung cao hon so vot cac loat b Dai Loan, Thai Lan va Malaysia. Tu (2015) ghi nhan su xuat hien loai Laurencia natalensis Kylm tai quan dao Tho Chu, Phu Quoc. Day la loai moi duoc ghi nhan gan day. Loai nay cung ghi nhan c6 hien dien fai vung bten Isipingo (Nam Phi) b dp sau 1 m. Tu (2015) eho fhay hau het ehi Laurencia hien dien tai viing bien Nam Tmng bo (Viet Nam) voi so lupng rat it va chua eo nhieu tiem nang ve kinh te. Suzuki (2009) cho biet rang co nhieu nghidn cuu bao cao ve stj hien didn va thanh phan loai rong do thupc chi Laurencia. Tuy nhien, tai Viet Nam hifin co it cdng trinh nghien cuu ve chi Laurencia va tbanh phan loai ciing bl han che.
Vung bien Phu Qudc hi^n co 22 hdn dao lon nhd. Vung bien nay da dupe quy hoach thanh khu du lich smh thai bien chat luong cao a Viet Nam va ti'ong khu vue Ddng Nam A. Khu Bao tdn bien Phu Qudc da dupe thanh lap nam 2007. Tuy nhien, hien 127
nay chua cd danh gia cung nhu bao cao cu the ve su hien dien cua loai rong bien thude chi Laurencia 6- khu vuc nay. Do vay, muc tieu ctia nghidn cthi nay la tun hieu hien frang phan bd va thanh phdn loai rong bien thuoc chi Laurencia d cac hdn dao d Phu Qudc se la eo so* ban dau giup danh gia ngudn tat nguyen bien sau nay va ciing la nen tang cho cae nghien cthi sau hon,
2. VAT LIB) VA PHUONG PHAP 2.1.V&tUeu
Thief bi dinh vi ket hpp vdi may anh Nikon D5300, may anh chup hinh dudi nude FinePbc (KP80 cua Fujifilm), ban Google map, bp thu mau va bao quan man.
Thiet bi xac dinh mdi trudng nude gdm may do dd man (Extech EC170) va may do pH (Euteeh Expert pH).
2.2. Phuong phap
2.2.1. Dia diem khao sit va thu miu Da tien hanh khao sat va tbu mau vao thang 5 nam 2017. Cae mau rong dupe thu tai vung bien ven 14 hdn eua dao Phii Qudc: hdn Dira, bdn Roi, hdn Thom, hon Kun Quy, hdn May Rtit Ngoai, hdn Vong, hdn Xudng, hdn Vang, hdn Dam Ngoat, hdn Dam Trong, hdn Khd, hdn Trang, hdn Gdm Ght, hdn Mdng Tay.
Nghien ethi da ap dung theo phuong phap Quadrat (Mtsra, 1968). Da tien hanh thu mau d 5 vi tri khac nhau ngau nhien tai mdi dia diem. Dien tich 6 khao sat 0,5 m x 0,5 m d do sau 0-3 m.
tiiuoe bd mat nude khac nhau d mdi vi tri khao sat (Bang 1).
2.2.2 Xic dmh da dang loai Phan loai loai
Nghidn cuu ap dung phuong phap phan loai rong cua Dawson (1954) va he fhdng phan loai fUCN (2015) de phan loai eac mdu rong dd thudc chi Laurencia dupe thu thap tai cac hdn d Phii Qudc.
Ngoai ra, da tham khao phan loai rong cua Nguyen Him Dat (2007), Dai (1997), Pham Hoang Ho (1969), Tseng (1983), Tu (2015), Le Nhu Hau va cpng su (2013).
Danhgia da dang loai
Nghidn ciiu ap dung danh gia da dang loai va chi sd ddng ddu cua Shannon & Weaver (1963) va chi sd tuong ddng (similarity index). Chi sd da dang smh hpc loai Shannon H' (Shannon and Weaver, 1963) la phdp thdng kd tdng hop eiia hai ydu td la thanh phan sd lupng loai va kha nang xuat bien ciia cae ca the trong mdi loai. Chi sd da dang sinh hpc loai Shannon .tf'khdng chi phu thupc vao tiianh phan loai, sd loai ma ca sd luong ca the va xac suat xuat hidn cua cac ea the ti'ong mot loat. Chi sd H'duac tinh theo cong thtic:
a^
Hinh 1. Ban do khao sdt va noi thu m&u loai LaurenciaSp. (Google m ^ ) Nghien cuu da ap dung phuong phap lay mdu phan tich mdi ti'udng nude eiia Pellizzari (2017). Da tien hanh do ludng cac thdng sd hda ly cua mau nude, bao gdm dd man, pH va nhiet dp b ba diem
'X;.-
Inp.H'= -[Pl,ln(Pl)^i'2.1r(P:)iP3,ln(P3)- -+Ps.ln(Ps)]
Trong dd: H': chi sd da dang sinh hgc loii Shannon; P,: tan sd xuit hien aia loai thu l;n: tdng so loai hoac S: tdng sd loai.
Chi sd ddng ddu Shannon / ' (Shannon Evenness J') khao sat tinh phan bd ddng ddu cua cae loai rong do thupc chi Laurencia. Chi sd 7'duoc tinh dua trdn chi sd da dang loai Shannon H'va H'max.
J' ^ H'/H'max (]' cd gia tri tir 0 den 1) H'max = — In ( - 1 . Trong do, H ' m a x la chisd da dang loai cire dai. Chi sd nay chi xuat hidn khi cae loai thupc chi Laurencia cd supban bd ddng ddu giiia cae loai vdi nhau va khi tdn sd xuat hien cua mdi loai trong qudn the bdng nhau. Nghien cim sir dting phdn mem Biodiversity Pro (McAleeee va cpng sir, 1997) dd phan tieh dinh lupng cac chi sd da dang sinh hpc Sharmon H'va chi sd ddng ddu Shannon /'.
N O N G NGHIEP VA PHAT TRIEN N O N G THON - KY 2 - THANG 7/2019
KHOA HOC CONG NGHE
Danh gia dd tiiong ddng thanh phdn lodi Ap dung cdng fhiic ctia Bray-Curtis (1957) de tinh chi sd tuong dong (sundarify index):
jfc=iMxa-:
Trong dd. V^^ va K^. la sd luong loai thir i frong khu vuc nghien cuu fhu j va k, (sd lupng loai p - 1, 2, 3,... I; so luong khu vuc nghien cuu n = 1,2,3,.. .j).
3. KFT QUA VA THAO LUAN
3.1. Dac di^m cua khu vuc nghidn cuu Ket qua nghien ctiu eho thay rang cac loai rong do thudc cht Laurencia hidn dien d nhidt dp (Bang 1) dao ddng ti-ong khoang 22,69 - 29,63°C. Dieu nay cho thay rang eac loai rong nay hidn didn d bidn dp nhidt tuong ddi hep hon vdt cac cac loai do Simic va cong su (2017) phat hidn d nfueu nhanh sdng d Serbia.
Btdn dd nhidt d vimg d Serbia fir 11,5-29''C. Tuy nhidn, Eggert (2012) cho bidt cae loai rong do cd the phat trien va tiiieh img tdt vd sinh ly hpc va hinh thai, nong dp protem va cac dac diem cua mang fe bao trudc su bien ddi ctia nhidt do moi trudng.
Ket qua pH tai cac hdn dao khao sat cd gia fri fir 7,61 den 8,25. Ket qua nay tuong ddng vdt cac ket qua nghien ciiu ve dd pH frong moi trudng rong bien hien dien (pH tir 7,3-8,8) cua Dadolaht-Sohrab va cong su (2012) d vinh Ba Tu (An Do). Tuy nhien, da ed su chenh Idch ve do pH theo nghidn etiu nay so vdi k^t qua do Smite va edng su (2017) tien hanh tai Serbia vdi dp pH la fir 7,0 - 9,23. Simic va cdng su (2017) nhan xet rang rong bien cd the ton tai frong bien dp pH khac nhau va tity thudc vao dac di^m sinh that, di^u kidn tu nhidn va kieu khi hau d mdi khu vue.
STT 1 2 3 4 5 6 7 8 9 10 11 12 13 14
Toa do 9"59'36.2"N 104-00'51.6"E 9"59'04.2"N 104"01'06.4"E 9"57'19.4"N 104'00'46.7"E 9"55'11.1"N 103'58'52.1"E 9"54'47.2"N 103-59'40.3"E 9"55'03.4"N 103'59'59.6"E 9-54'56.2"N 104-01'26.1"E 9"55'38.8"N 104-01'06.7"E 9-59'28.8"N 104'02'31.3"E 10'00'20.8"N 104'01'46.2"E 9"55'45.3"N 103"59'32.5"E 9"54'13.2"N 103"59'29.8"E 9-54'38.2"N 104"00'46.0"E 9-54'35.2"N 104'01'20.7"E
Dao Hon Dira Hon Roi Hon Thom Hon Kim Quy Hon May Rut Trong Hon Vong Hon Xuong Hon Vang Hon Dam Ngoai Hon Dam Trong Hon Kho Hon Trang Hon Gam Ghi Hon Mong Tay
Nhiet do (•C) 23,59 24,61 23,81 27,53 22,69 27,94 27,82 28,73 28,86 24,79 29,63 28,92 28,84 29,07
pH 8,15 7,92 8,25 7,61 7,78 7,91 8,01 8,12 7,85 7,67 8,08 8,22 7,95 7,82
Dp man 29,33 31,33 32,33 31,33 29,67 30.67 29,33 30,67 32,00 31,33 31,00 29,67 31,00 30,67 Tuy nhidn, theo k^t qua khao sat dp man bien
dpng tir 29,50%o den 32,50%o. Dd man frung binh phu hpp vdi su phan bd cua eac loai rong thuoc cht Laurencia la 30,74%, frong do dia diem phan bd da dang va thich hpp nhat vdi cac loai fhudc chi Laurencia cd do man la 32,33% (hdn Thom). Dd man nay tuong ddng so vdi kdt qua nghien cihi do Dadolahi-Sohrab va cdng sir (2012) cdng bd a vinh Ba Tu la 32-43%o. Didu nay eho thay ngoai cac yeu td anh hudng ve nhidt do va pH, thi su phan bd va ton tai cua eae loai thuoe ehi Laurencia cdn phu thudc kha ldn vao dd man ciia nuoc bien.
3.2. Ddnh gid su da dang phan bd
Nghien etiu cho thay 35 mdu rong do fhudc chi Laurencia chi hien didn d viing bien ven 8 dao: hdn Dira, hdn Rot, hdn Thom, hdn Khn Quy, hdn Vong, hdn Xudng, hdn Vang, hdn Khd. Khdng ghi nhan duoc su hidn dien ctia eae loai rong do thuoc chi Laurencia tat vung bien ven eae hdn Trang, hdn Kho, hdn Gdm Ghi, hdn Mdng Tay, hdn Dam Ngoai va hdn Dam Trong.
Kef qua phan loai 35 mdu rong dd thuoc ehi Laurencia thu duoc tai eae vitng bien ven 8 hdn dao NONG NGHIEP VA PHAT TRIEN NONG THON - KY 2 - THANG 7/2019 129
KHOA HOC CdNG NGMk
Ciia dao a Phii Quoc dugc phan loai thanh 7 loai (4 loai), dep den la hon Xuong va hon Dira (2 loai), (Bang 2 & hinh 2). Cac loM thuoc chi Laurencia phan hon Roi, hon Kun Quy, hon Vong, hon Kho va hon bo rai rac o 8 dao, tap trung nhi^u nhat a hon Thom Vang vol 1 loai.
Bang 2. Su hien dito cua cAc loii rong do thupc chi Laurencia ven cac hon dao thuoc dao Fhii Q»6c Loai
Laurencia cartilagmea Laurencia obtusa Laurencia microcladia Laurencia majuscule Laurencia mcdermidiae Laurencia pmnata Lnurencia vmdis Tdng
1 +
+
2 2
+
1 3 + + + +
4 4
+
1 5
-I-
1 6
+
-
+ 2
7
-i-
1 8 +
1
Gta tn kmh te + + + +
•' Ghi chii: (I): hdn Dua; (2) hdn Rai; (3) hdn Tham, (4) hdn Kmi Qui; (5) hdn Vong; (6) hdn Xudng; (7) hdn \ 'ang; (8) hdn Khd. (+): cd suhien dien; (-): khdng cd su hien dien.
Laurencia obtusa Laurencia pinnata Laurencia microcladia Hmh 2. Hmh anh dac trung ctia 7 loai rong dd thudc chi Laurencia Christian va Kai (2012) cho bi^t rdng eac loai
rong do thude ehi Larencia phan bd khong ddng deu la do anh hudng cua birc xa mat trcA, may va dac biet la thity tridu. Wilhelm and Sehnar (2011) eho biet rdng rong bien la tiiuc vat cdn anh sdng de quang hop.
Nhimg lodi phan bd gan tdng nude mat phat tiien manh hon so vdi cac loai phan bd d- dp sau hon vi cac loai d gdn tdng nude mat thu nhan lupng bu'c xa tir mat
frdi nhieu hon so vdt cac loai phan bd d dd sau hon.
Pellizzari (2017) cung chting mmh rang sir phan bd khong ddng ddu cd the la do su thieh nghi, dieu kidn nhiet dd, do man va do pH va nhu eau dinh dtrong etia loai rong dd trong qua trinh smh trudng va phat trien.
Ngoai ra, Smale va cong su (2010) cung cho thay sti phan bd cua cac loai thuoc chi Laurencia edn phu fhudc rat ldn vao yeu td thdi gian va khdng gian.
NONG NGHIEP VA PHAT TRIEN NONG THON - KY 2 - THANG 7/2019
KHOA HOC CONG NGHE 3.3. Ddnh gid da dang lodi
Chi sd da dang sinh hpc loai i/^'khdc nhau giira cac lodi. Chi sd nay dao dpng tir 0,196 den 0,689 (Bang 3). Tinh da dang cao nhat la lodi Laurencia mcdermidiae vdi H' - 0,689, tiep theo la loai Laurencia cartilagmea vd Laurencia majuscula (H' = 0,301) vd thap nhat la Laurencia pinnata (H'= 0,196).
Tuy nhidn, chi sd ddng deu Shannon / ' d hai loai Laurencia cartilaginea va Laurencia majuscula lai cao nhat (J'= 1,000). Laurencia mcdermidiae da dang hon hai loai Laurencia cartilaginea va Laurencia majuscula nhung ehi sd phan bd dong deu lai thap hon. Loai Laurencia pinnata cd chi sd da dang sinh hoc loai H'va chi sd ddng deu / ' t h a p nhat so vdt cdc loaicon laity-0,650).
Bang 3. Chi so da d^ng sinh hoc loai Shannon (H) vd chi sd d6ng d ^ Shannon (J) tai cac di^m fhu mau
ven cac hon cua dao Phu Qudc Loai
Laurencia cartilagmea Laurencia obtusa Laurencia majuscula Laurencia mcdermidiae Laurencia pinnata Laurencia viridis Laurencia microcladia
H' 0,301 0,276 0,301 0,689 0,196 0,287 0,298
/'
1,000 0,943 1,000 0,986 0,650 0,954 0,991
' " ' ^ ° " " ' " " ' " '
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Hinh 3. Sy tuong ddng ciia cdc lodi thudc chi Laurencia tai vimg bien ven cac hdn cua
dao Phti Qudc
Sd hdu d bdng 3 cho tiiay chi sd da dang loai cua chi Laurencia ven cac hdn cua dao Phu Qudc tuong ddi thap (H' - 0,196-0,689) so voi nghidn ctiu cua Pelhzzari nam 2017 tai qudn dao Nam Shetiand d Nam Cue v^ cae lodi rong biln (H= 3,250-4,090). Cac ket qud tren cho thay su tuong ddng vdi kdt qua nghidn cuu do Pelhzzari (2017) cong bd. Dieu nay
cho thay rdng vimg bien tai cac hdn dao khac nhau cd dac diem mdi trudng khac nhau nen cd tinh dac thu neng vd tiianh phdn va su phan bd cua cac sinh vat d' dudi biln. Ngoai ra tinh da dang ve loai khdng chi phu thudc vao vi fri phan bd d cac hdn ddo ma cdn phu thupc vao tan sd xuat hidn etia eae lodi d eac hdn ddo nay.
Chi sd tuong ddng tbanh phan loai eua cht Laurencia tai vung bien d cac hdn ddo cua ddo Phu Qudc dat tii 11,76% den 79,36% va dupe chia fhanh hat nhanh: mdt nhanh nhd va mdt nhanh tirong ddi ldn. Su phan vimg da tao dugc tinh khac bidt trong su phan bd gitra cae loai (Hinh 3). Trong nhanh ldn, ba lodi Laurencia microcladia. laurencia obtusa va Laurencia majuscula cd mtic dd tuong ddng ve noi phan bd cao (50,21-79,36%). Rieng hai lodi Laurencia viridis va Laurencia mcdermidia b nhanh nhd nhin chung it ed sir tuong ddng ve noi phan bd hon so vdi cdc loai khae (33,12%). Pellizzari (2017) cho tiiay su xuat hien vdi tdn sd thap phan anh tbanh phdn dac tnmg eiia loai va ed the do Id lodi quy hiem. Dilu nay cho thay rang muc do gan giii va tuong ddng ve noi phan bd giua cac loai d eac diem khao sat phdn dnh tmh chat mdi trudng va dinh duong cd nhieu diem khac biet.
3.4. Gid tri kinh t l cua chi Laurencia Laurencia dupe ung dung trong eac linh virc thuc pham va y hoc. Cac hpp chat duoc phan lap fir loai thupc chi Laurencia dupe sii dung lam thudc va su dung trong y hpc (Shaza, 2014). Wang va cdng su (2013) eho biet cac loai rong dd thudc chi Laurencia dupe su dung de san xuat cae chat chuyen hda thii cap vi cac chat ehuyin hda nay cd cdc dac tinh cau tnic da dang va dpc dao va nhung dac finh nay thay ddi fiiy thupc vao timg loai, dia dilm va thdi gian thu mdu. 4 loai Laurencia mcdermidiae, Laurencia majuscula, Laurencia microcladia, Laurencia obtusa dupe ting dting rdng rai va phd biln d l san xuat cac hpp chat thti cap (Irie 1965).
Loai Laurencia majuscula dupe thu tai hdn Thom va hdn Xudng da duoc Yang va cdng su (2008) nghidn cuu dl ly trich cac hoat chat khang khuan va chat chdng oxy hda. Lee va cdng su (2004) va Middleton vd cdng su (2000) chiing minh boat tinh chdng oxy hoa cd vai trd quan trpng khac nhau va sir dung frong nhieu loai dupe pham nhu chdng lao hda, khdng viem va khdng te bao ung thu.
NONG NGHIEP VA PHAT TRIEN NONG THON - KY 2 - THANG 7/2019 131
Cdc lodi rong dd thude chi Laurencia dupe ngudi dan thu thap lam fhuc pham va dupe Heu. Tuy nhien, viec su dung ndy chua tan dung tdi da dupe lpi ich cua cdc lodi rong dd. Can ed nhiing nghien eiiu sau hon ddi vdi ngudn loi rong bien d Phu Qudc, dac biet la cac loai rong dd thudc chi Laurencia. Can cd quy hoach va sii dting hpp ly ngudn lpi tir thien nhidn, dac biet ngudn lpi rong bien d l phuc vu cho su phat tnen kmh te xa hot cung nhu bao ve mot trudng. Can bang he smh thdi la dieu kien tien quyet giup phat trien du lich bien bdn vung eung nhu dat duoc cac muc tieu ben vting v l mot trudng va phat tiien kmh te xa hdi cua Viet Nam.
a.KETLUANVAKIBVNGH!
4.LK^tlu|n
Da xac dinh 7 loai rong dd thupc chi Laurencia tai 14 hdn dao tai Phu Qudc. 4 trong 7 loai cd gia tri kmh te cao. Chi sd da dang cua cac loai rong do thude ehi Laurencia d mtic dp trung binh. Chi sd ddng deu ctia cdc loai nay tuong ddi cao. 2 loai Laurencia microcladia va Laurencia obtusa cd tan sd xuat hien ddng thdi cung nhau cao nhat (79,36%).
Mdi frudng sdng eua cac loai nay hien nay cdn tuong ddi nguydn ven vd if bi tac dpng do cae boat dpng cua con ngudi.
4.2. Ki^n nghi
Phu Qudc hien cd 22 hdn dao ldn nhd, cd Khu Bdo tdn biln Phu Qudc. Do eac lodi rong dd thuoe ehi Laurencia hien cd gia tri kinh fe nen can cd nghien ciiu md rdng d cac hdn dao cdn lai cua Phu Qudc eung nhu hoan chinh danh luc cae lodi rong biln tai Phu Qudc. Day la eo sd ban ddu giup dua ra cde bien phap bao tdn thieh hpp eung nhu giiip ddnh gid tac ddng eiia hoat ddng phat trien kmh te xa hpi ddi vdi hidn trang va thdnh phan lodi. Ciing cdn cd nhieu nghien ciiu sau hon ve ly tinh va hda tinh cua cae loai nay nhdm xae dinh gia fri kinh te eua cac lodi rong hien dien tai vung Phu Qudc. Ngoai ra, cdn khuyen khich nudi ti-dng tao thu nhap cho ngudi dan dia phuong cung nhu ldm gidm tac ddng do thu lupm rong bien tiJ phat hidn dang xay ra.
LdlCAMON
Nhdm tie gii xin chan thinh cam on Bd Giao due va Dao tao da hd tig kinh phi thdng qua dd tai (B201&KGU-0I).
TAI UEU THAM KHAO
1. Albert, L. (1987). The Nahu-al Products Chemistry of the Red Algae Ptilofa fihchia and
Laurencia obtiisa. Oregon State University, Master of Science, 1-69.
2. Christian, W. and Kai, B. (2012). Seaweed Biology, Novel Insights mto Eeophysiology, Ecology and Utilization, Springer 219.
3. Dadolahi-Sohrab, A., Garavand-Karimi, M., Riahi, H., and Pashazanoosi, H. (2012). Seasonal variations in biomass and species composition of seaweeds along the northern coasts of Persian Gulf (Bushehr Provmce), Journal of Earth System 5aence, 121(1), 241-250.
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RED SEAWEED OF LAURENCIA GENUS (RHODOPHYTA IN PHU QUOC, KIEN GIANG, VIETNAM:
DISTRIBUTION AND SPECIES IDENTMCATION
Nguyen Tan PhongS Huynh Van Tien^ Truong Trong Ngon^
^ Faculty ofEnvtionment and Labour Safety, Ton Due Thang University
^ Faculty of Envtionment and Resources. Kien Giang University
^ Biotechnology Research and Development Institute, Can Tho University Summary
Red seaweed species of the genus laurencia are of high economic value. However, there was limited information regardmg distribution or composition of these read seaweed species in Vietnam. This study aims to imderstand status of, and composition of, seaweed species of the genus Laurencia in Phu Quoc.
Expected findings will function as a basic information, from which evaluation and strategic plans would be developed to protecting Red seaweed species or undertake further studies. This study employed quadrat method for collecting samples, samphng and analytical methods, species identtficaUon, species ncbness, similarity index to achieve the study's objective. 8 of the 14 Islam's tn Phu Quoc encountered the presence of 7 species of the genus of Laurencia (Laurencia cartilaginea, Laurencia majuscula, Laurencia mcdermidiae, Laurencia microcladia, Laurencia obtusa, Laurencia pinnata, Laurencia viridis). 4 of 7 species are of high economic value, the species bad a minimum index of species richness, fluctuating between 0.196 and 0.689. Laurencia microcladia and Laurencia obtusa bad the highest frequency of occurrence, with 79.36%. Meanwhile, tbe species had a relatively high level of similanty index, ranging between 0,650 and 1,000. These species had relatively intact habitats. Additional studies are needed to adequately imderstand red seaweed species and their habitats and to properly plan and rationally use these species in Fhu Quoc, Keywords: Laurencia, Phu Quoc, Rhodophyta. Sea weed resource.
Ngudi phan bidn: PGS.TS. Nguyen Xuan Ly Ngay nh^n bai: 02/4/2019
Ngay thdng qua phan bidn: 3/5/2019 Ngay duydt dang: 10/5/2019
