Ảnh hưởng của độ mặn và hàm lượng vật chất hữu cơ đến thành phần giáp xác lớn (malacostraca) ở hệ sinh thái rừng ngập mặn cù lao dung, tỉnh sóc trăng

ANH Hl/ONG CUA DO MAN VA HAM LUONG VAT CHAT HUTJ CO
DEN THANH PHAN GlAP XAC LON (MALACOSTRACA) 6 HE SINH THAI
RUNG NGAP MAN CU LAO DUNG, TINH SOC TRANG
Huynh TrUcfng Giang1, Au Van Hoa1, Tran Trung Giang1
Dilcfng Van Ni2, Nguyen Thi Kim Lien1

TOM TAT
Nghien cPu anh hildng cua do man va ham lppng vat chat hflu CO den thanh phan Malacostraca d he sinh
thai rPng ngap man Cu Lao Dung (CLD) dope thtfc hien tO 9/2019 - 3/2020. Tong cong co 24 diem thu mau
dupe chia thanh 8 nhom thuy vpc. Trong do co 5 nhom thuy vpc thuoc viing noi dong va 3 nhom thuy vpc
thuoc rtfng ngap man CLD. Ket qua cho thay co tong cong 13 loai thuoc Malacostraca dilpc ghi nhan. Sii thay
doi do man co anh hudng dang ke den su phan bo cua Malacostraca. Mat do Malacostraca bien dong kha cao
giuta cac diem khao sat va vao mua kho co xu hudng cao hdn mua miia. Cac loai Macrophthalmus depressus,
Uca sp., Limnoria lignorum va Squilla mantis tiidng quan thuan co y nghia vdi do man (p < 0,05). Ngoai ra, hau
het cac loai Malacostraca thong quan thuan khong co y nghia thong ke vdi ham liipng TOM (p > 0,05), ngoai
trrt loai S. mantis. Nhin chung, thanh phan loai Malacostraca kha thap va can dhpc bao ton nham duy tri sh can
bang sinh thai d rilng ngap man CLD.
Th khoa: Malacostraca, do man, ham liipng TOM, rhng ngap man Cu Lao Dung

I. DAT VAN DE
Malacostraca la mot trong nhflng 16p ldn nhat
cua nganh phu giap xac (Crustacea) thuoc nganh
chan khdp Arthropoda, co thanh phan loai rat da
dang, chung phan bo 6 ca moi triicfng midc ngot,
lp - man, ngay ca trong niidc ngam. O he sinh thai
rilng ngap man, khu he dong vat khong xhPng song
chu yeu la cac loai giap xac. Ngoai vai tro quan trong

trong chuoi dinh dildng, mot so loai giap xac lien
tuc dao hang trong bun de tim noi tru an va dp trP
thPc an. Cac loai giap xac van chuyen chat hflu cO

tP cac dia tang ben dildi len be mat bang each dao
trong lefp tram tich (Macintosh, 1988). RPng ngap
man la he sinh thai ven bien thuoc vung chuyen
tiep giPa dat lien va bien, bi anh hodng manh me
bdi thuy trieu, nen thanh phan loai giap xac bien
dong ldn. Sp phong phu cua giap xac bi anh hiicing

Khoa Thuy san, Truong Dai hoc Can Tho
: Khoa Moi tnrbmg va Tai nguyen Thien nhien, Truong Dai hoc Can Tho
42


Tap chi Khoa hoc va Cong nghe Nong nghiep Viet Nam - So 06(127)/2021

bdi dieu kien moi trQdng song, sQ phong phu va
nguon thiic an san co cung nhQ so lQpng dich hai.
Ngoai ra, vat chat hQu co d rQng ngap man la nguon
thQc an quan trong cho cac quan the sinh vat khac
□hau nhQ ca, tom va cua. San liipng tom, ca d vimg
bien phu thuoc nhieu vao san liipng vat chat hQu cO
do rQng ngap man tao ra (Anneboina and Kumar,
2017). Tuy nhien, Hariyadi va cong tac vien (2020)
cho rang quan xa giap xac 6 khu vQc riing ngap man
rat da dang va on dinh. Cac loai giap xac cung co
cac yeu to moi trQdng gicfi han cho ddi song cua
chung, chang han nhii nhiet do, do man, do pH,
tinh chat nen day va ham liipng chat hQu cO trong
nen day thuy vQc. Nhiing thay doi ve chat liipng cua
he sinh thai thuy sinh va tinh chat nen day cung se
anh hiidng den sQ phong phu va da dang cua giap

xac cung nhii cac sinh vat khac. Do man cung la
mot trong nhiing yeu to moi triidng quan trong
anh hiicfng den sii phan bo cua cac loai giap xac
(Delgado et at, 2011). Vi vay, nghien cdu nay diipc
thpc hien nham tim hieu anh hQdng cua do man
va ham liipng vat chat hQu cO den thanh phan cua
Malacostracca d riing ngap man Cu Lao Dung, tinh
Soc Trang nham co bien phap bao ton nguon lpi
giap xac d khu viic nghien cQu.

n.

gau Petersen (dien tich mieng gau 0,03 m2) vdi tong
cong 10 gau va cho lan lQpt qua sang day co kich
thQdc mat hidi 0,5 mm. Mau sau khi thu dQpc sang
loc that sach va cho vao chai nhQa ldn, co dinh bang
formol d nong do tQ 8 -10% . Dinh danh thanh phan
loai Malacostraca bang phQdng phap hinh thai dQa
theo cac tai lieu phan loai cua Thai Thanh DQdng
(2003), Lee va cong tac vien (2015) va Ng va Davie
(2002). Mat do Malacostraca dQpc xac dinh theo
cong thQc:
D = X/S (Trong do: X la so ca the dem diidc, S Id

dien tich thu mau (S = n x d , vdi n la so gau thu mau
vd d la dien tich mieng gau).
Ngoai ra, do man dQpc do trQc tiep tai cac
diem thu mau bang may do da chi tieu (Hana
HI9828). Mau bun day dQpc thu tren mat nen day
d do sau khoang 1 0 -2 0 cm vdi trong lQpng khoang

500 g/mau, tron deu mau, trQ lanh d 4°C va sau do
xac dinh ham lQpng vat chat hQu cd (TOM) bang
phQdng phap dinh lQpng d nhiet do 80°C trong 24
gid, tiep tuc nung d 450°C trong 6 gid, sau do can de
xac dinh phan tram TOM. TQdng quan (Pearson)
giQa do man va TOM dQpc xQ ly bang phan mem
SPSS 22.0.

DOI THONG VA PHl/ONG PHAP NGHIEN CtfU

2.1. Doi tiipng nghien ciiu
Thanh phan loai va mat do Malacostraca d he
sinh thai riing ngap man cua Cu Lao Dung thuoc
tinh Soc Trang la doi tiipng chinh trong nghien cQu
nay.

2.2. PhiiPng phap nghien ciiu
Tong cong co 2 dpt thu mau vao miia mQa (thang
9/2019) va miia kho (thang 3/2020). 6 moi dpt nghien
cQu co 24 diem thu dQpc d cac song, rach thuoc khu viic
riing ngap man Cu Lao Dung va chia lam 8 nhom thuy
vpc (ky hieu tQ N1 den N8), moi nhom thuy viic diipc
thu lap lai 3 lan. Cac nhom thuy viic diipc thu theo mat
cat ngang cua rQng ngap man (RNM) va theo hiidng
tQ vimg noi dong (VND) gom cac diem N l, N2, N3,
N4 va N5 ra den RNM vimg ven bien co cac diem N6,
N7 va N8. Cac diem thu mau d VND co khoang each
tQ 6,5 - 9,5 km va d khu vQc RNM co khoang each tQ
3,5 - 5,0 km, mQc nQdc tai cac diem thu mau bien
dong tQ 1 - 2,5 m. Vi tri cua cac diem thu mSu

dQpc trinh bay d Hinh 1. Thanh phan loai va mat
do Malacostraca tai moi vi tri dQpc thu d cac bang

III. KET QUA VA THAO LUAN
3.1. Do man va ham lQdng vat chat hflu cd d rQng
ngap man Cu Lao Dung, tinh Soc Trang
Do man tai cac diem thu mau theo mua d Cu Lao
Dung, Soc Trang ghi nhan dao dong tQ 0,1 - 18,6%o,
trung binh 5,7 ± 4,4%o, cao nhat d diem N6 vao
mua kho va thap nhat d diem N l vao mua mQa
(Hinh 2). Bien dong do man co sQ chenh lec rat
ldn giQa mua mQa va mua kho. Vao mua mQa,
do man giQa cac diem thu mau dao dong tQ
43


Tap chiKhoa hoc va Cong nghe Nong nghiep Viet Nam - So 06(127)/2021

0,1 - 4,9%o, trung binh 1,3 ± l,6%o, va co xu hiicfng
tang dan tP diem N1 den N7 nhiing giam hcfn 2,3
lan tai diem N8. Do man vao mua miia rat thap la
do vao thdi diem nay la mua lu, bi anh hiidng trite
tiep bdi nguon niicfc tii thtfe/ng nguon song Hau do
ve va nhan diipc liipng niicfc miia rat ldfn nen co
sit giao thoa giPa niicfc ngot va niidc bien tai day.
Ngiipc lai, vao mua kho do man cao hcfn rat nhieu
so vefi mua miia va dao dong tii 1,1 - 18,6%o, trung

binh 10,1 ± 7,l%o, co xu hiicfng tang dan tii diem
N1 den N6 sau do giam nhe 6 diem N7 va N8. Vao

thdi diem nay do liicfng mila giam, qua trinh xam
nhap man tii bien vao nen do man tang cao hefn.
Ket qua nghien cPu cho thay do man tai cac diem
thu mau co xu hiicfng tang dan tii khu vpc noi dong
(N1 - N5) den khu vPc riing ngap man (N6 - N8)
cua huyen Cu Lao Dung, tinh Soc Trang.

4.500
4.00
^ 3.500
^ 3.00
^ 2.500
S 2.00
g l.5 0 0
H 1.00
.500
.00

!

I

I

I

1

I

!

N1 N2 N3 N4 N5 N6 N7 N8
(b)
Hinh 2. (a) Do man va (b) TOM cua cac diem thu mau d he sinh thai riing ngap man Cii Lao Dung
Ham liipng TOM the hien ham liipng vat chat hiiu
ccf tren nen day cua cac diem thu mau cf viing nghien
cPu. Ham liipng TOM trung binh tii 2,5 ± 0,3%
va 2,7 ± 0,4% tiicfng Png cho mua miia va mua kho.
Ham liipng TOM trong nghien cPu nay tiicfng doi
thap hcfn so vPi nghien ciiu cua Nguyen Thi Kim
Lien (2017), TOM tren song Hau bien dong tii
2,4 - 10,0%, trung binh 5,7 ± 1,4%. Cf nghien cPu
hien tai, TOM co xu hiiong cao hdn vao mua kho cf
cac diem N6, N7 va N8 vimg RNM, do vao mua kho
la cay riing rPi rung nhieu hon, qua trinh phan huy
xac la cay riing lam gia tang ham liipng vat chat htfu
c p , tii do ham liipng TOM cung tang len.

tinh Soc Trang. Viec xac dinh thanh phan loai cua
giap xac con phu thuoc vao phiiPng phap thu mau
va mua vu thu mau. Vao mua miia tai cac vi tri N l,
N2 va N3 do moi triicfng niicfc co do man rat thap
(< l%o) nen khong tim thay sif hien dien cua cac
loai Malacostraca. Diem N6 co thanh phan loai
cao nhat (6 loai) trong so cac diem thu mau vao
mua kho, day cung la diem thu co do man trung
binh cao hpn cac diem thu khac cf khu vpc khao
sat (Hinh 3). Thanh phan loai cua Malacostraca
co xu hiicfng cao d cac vi tri RNM ca trong miia

miia va mua kho. Ket qua tii hinh 4 cho thay co 6
loai diipc ghi nhan ca trong mua miia va miia kho
nhii Alpheus digitalis, Uca sp., Macrophthalmus
3.2. Thanh phan loai Malacostraca cf riing ngap
japonicas, Squilla mantis, Cirolana sp. va Acetes
man Cu Lao Dung, tinh Soc Trang
indicus cho thay day la cac loai rong muoi co the
Qua cac dpt khao, ket qua da ghi nhan tong cong phan bo d cac do man khac nhau. Co 4 loai chi tim
59 loai dong vat day, trong do co 13 loai, 12 giong, thay vao mua miia gom Sesarma mederi, Ocypode
8 ho thuoc lefp Malacostraca, chiem ti le 22% tong ceratophthalmus, Gammarus locusta va Aratus
so loai cua dong vat day cf riing ngap man Cu Lao pisonii va 3 loai ghi nhan diipc trong miia kho la
Dung, Soc Trang. Thanh phan loai Malacostraca Pseudosesarma moeschi, Macrophthalmus depressus
xac dinh diipc trong nghien cdu nay tiiOng doi thap va Limnoria lignorum. Ngoai ra, ket qua hinh 5
hon so v6i nghien cdu cua Negromonte va cong tac cho thay co 3 loai hien dien trong mua miia cf khu
vien (2012), da xac dinh diipc 17 loai giap xac thuoc vpc RNM, do la O. ceratophthalmus, G. locusta va
14 giong va 13 ho cf riing ngap man Gaibu, bang A. pisonii, 2 loai chi phan bo vao mua kho cf khu vpc
Pernambuco, Brazil. Trong khi Le Van Tho va cong RNM nhii P. moeschi va M. depressus. Rieng khu
tac vien (2020) da ghi nhan diipc 34 loai cua thuoc vpc VND khong tim thay loai phan bo dac triing ca
17 giong va 7 ho 6 riing ngap man Cu Lao Dung, trong mua kho va mua miia.
44


Tap chi Khoa hoc va Cong nghe Nong nghiep Viet Nam - So 06f 127)/2021

8
* 6
|o 4
*<

■ Gammaridae

■ Ocypodidae
= Limnoriidae

■ Alpheidae

s Macrophthalmidae
« Sesarmidae
■ Cirolanidae
ss Squiliidae

W2

0
Nl N2 N3 N4 N5 N6 N7 N8 Nl N2 N3 N4 N5 N6 N7 N8
VND

RNM

Mua mua

VND

RNM

Muakho

Hinh 3. Thanh phan loai Malacostraca cua cac nhom thuy vile d riing ngap man CLD
Mtia mua-RNM

Mua kho

Hinh 4. Chia se thanh phan loai Malacostraca
vao mua mUa va mua kho d rvfng ngap man
Cu Lao Dung

Mtia kho-VND

Hinh 5. Chia se thanh phan loai Malacostraca
d khu vUc VND va RNM vao mua mila va mua kho
d riing ngap man Cu Lao Dung

3.3. Mat do Malacostraca or riing ngap man Cu cua viing bai trieu trong khi loai A. nuttingi chiem
Lao Dung
ilu the d nen day soi. Cac diem thu d RNM co mat
do Malacostraca bien dong til 1 -11 ct/m2, trong do
Mat do cua Malacostraca trung binh c6 stl dao
mat do cua loai cua cay A. pisonii (Sesarmidae) co
dong kha cao gifla cac diem thu mau, bien dong
so ltlpng trung binh cao nhat. Cua cay riing ngap
til 0 - 57 ct/m2. Vao mua miia, mat do Malaostraca
man dtlpc tim thay d vimg nhiet ddi va ban nhiet
kha thap, bien dong til 0 -1 1 ct/m2, thap hcfn so vdi
ddi. Day la loai cua rat nhanh nhen, giai doan cua
mua kho, dao dong til 1 - 57 ct/m2 (Bang 1). Mat do
con chung thildng bo len nhQng r§ cay nho khoi mat
Malacostraca trung binh vao mua kho cao hon mua
dat nham tranh dich hai, giai doan trtldng thanh
mila d ca khu vtlc VND va RNM va diloc the hien
chung co the bo len tdi ngon cay (Branco, 1991;
d hinh 7.
Conde et ah, 2000). Mot so nghien ctiu cho thay

Vao mua mtia, cac diem thu N l, N2 va N3 loai cua nay (con cai mang trifng) xuat hien quanh
khong tim thay sii hien dien cua Malacostraca do nam va sinh san lien tuc (Santana et ah, 2018), tuy
thdi diem nay moi trildng ntldc co do man thap, nhien nghien cdu cua Nicolau and Oshiro (2002)
nen day co ti le set, bim va cat lan lilcft la 6 ± 4%, cho rang chung khong dtlpc tim thay d cac thang 5
87 ± 14% va 7 ± 7%, chenh lech kha cao so vdi mua den thang 7. Cac loai con lai thude ho Gammaridae,
kho vdi ti le set, bun va cat lan lildt la 15 ± 5%, Macrophthalmidae, Aegidae, Ocypodidae va
70 ± 14% va 16 ± 10%, nen co the lam han che sil Squiliidae co mat do rat thap ( 1 - 2 ct/m2).
phat trien cua chung. Diem N4 co sil ilu the cua loai
Vao mixa kho, mat do cua Malacostraca trung
tom go mo A. digitalis (Alpheidae) phan bo d moi binh co xu htldng cao hdn mua mila. Cac diem N l,
trildng ntldc lo - man va trong dieu kien nen day N2 va N3 co mat do rat thap, chi khoang 1 ct/m2.
bim, chiem ti le 88% bim trong cau true nen day. Doi vdi ho Alpheidae, ben canh sil hien dien cua
Theo Mossolin va cong tac vien (2006), cac loai tom loai A. digitalis con co stl xuat hien cua A. indicus
go mo (ho Alpheidae) phan bo tren khap the gidi d diem N l va N3. Theo Bhattacharya (1988) (dtlpc
va xuat hien til vimg bai trieu den viing nxldc sau. trich bdi Xiao and Greenwood, 1993), loai Acetes
Loai A. armillatus phan bo chu yeu d nen day bun indicus thich nghi trong moi trildng co nhiet do
45


Tap chi Khoa hoc va Cong nghe Nong nghiep Viet Nam - So 06(127)/2021

til 22 den 25°C, khoang nhiet do co the ton tai til
14 - 34°C. O Malaysia, hai loai A. indicus va
A. japonicas ddpc khai thac thildng mai til thang
3 den thang 12. Cac loai tom nay chu yeu ddpc
sil dung la lam thifc an len men va lam san pham
kho. Tam quan trong chinh cua Acetes trong linh
vdc thilcfng mai la lam thdc an cho con ngddi va
chung co tiem nang nhil mot loai thdc an cho nuoi
trong thuy san (Ung and Itoh, 1989). Loai Uca sp.

(Ocypodidae) (cua keo dan) co mat do trung binh
tiidng doi cao hon cac loai khac ( 1 - 1 4 ct/m2) 6

cac diem til N4 den N8. Cac thong so moi trddng
chu yeu anh hddng den sd phan bo cua cac loai
cua nay la tham thdc vat, tinh chat nen day, thdc
an, do man, che do thuy trieu va sd hien dien cua
cac loai dong vat khac (Cesar et a l, 2005). Ngoai
ra, vao mua kho co sd ilu the cua loai Cirolana sp.
(Cirolanidae) 6 diem N4, ncfi co do man 7%o va ham
lilpng TOM 2,6%, cac nghien cdu ve Isopoda hien
nay chila ddpc de cap nhieu. Cac ho con lai co mat
do thap hon ( 1 - 3 ct/m2) gom Macrophthalmidae,
Sesarmidae, Limnoriidae va Squiliidae.

Bang 1. Mat do trung binh (ct/m2) cua cac ho thuoc lcfp Malacostraca 6 rilng ngap man Cu Lao Dung
Muamtla
TT

Ho

RNM

VND

N1

VND

N2 N3 N4 N5 N6 N7 N8 N1

1

Gammaridae

2

Alpheidae

8

3

Macrophthalmidae

1

4

Ocypodidae

5

Sesarmidae

6

Cirolanidae

7

Limnoriidae

8

Squiliidae
Tong cong

Mua kho

RNM

N2 N3 N4 N5 N6 N7 N8

1
3

1

1

1

1

2

2

1

2
1

3

6

1
6

1

8

1
0

10

3

1

1

2

1

1

1

21

8

4

49
1

0

4

2

1

0

14

11

1

6

1

1

2

57

8

3.4. Tiitfng quan giiia do man va ham lddng TOM U. maracoani ddpc tim thay song trong cat rat min.
vdi mat do cua Malacostraca of rilng ngap man Cu Loai U. leptodactyla thi tdOng quan nghich vdi ham
Lao Dung, Soc Trang
ldpng chat hdu co va do am, trong khi U. thayeri cho
Nhin chung, do man co anh hddng den sil phan thay moi tdcfng quan thuan vdi ca hai yeu to do man
bo cua cac loai thuoc Malacostraca. Ket qua cho va tinh chat nen day. Loai U. maracoani va U. rapax
thay trong tong so 13 loai diipc xac dinh thi co 2 thi khong tdOng quan vdi vat chat hdu cO hoac do
loai L. lignorum va S. mantis tilOng quan thuan am (Bezerra et al., 2006). Loai cua cay A. pisonii co
co y nghia vdi do man 6 mile p < 0,05 va 2 loai xu hddng tdOng quan nghich vdi do man nhdng
M. depressus, Uca sp. thong quan chat che vcfi do khong co y nghia thong ke (p > 0,05). TdOng td
man d miic p < 0,01 (Bang 2). Trong nghien cdu nay, vdi nghien cdu cua Conde va cong tac vien (2000),
loai M. depressus chi ddpc tim thay d do man 19%o tac gia cho rang cac yeu to pH, do man va nhiet do
vao mua kho, trong khi loai S. mantis va L. lignorum nddc khong anh hddng den chu ky sinh san hoac ty
ddpc phat hien of khoang do man bien dong lan liipt le gidi tinh, cac ca the trddng thanh ddpc tim thay
til 10 - 17,5%o va 5 - 19%o. Do man va tinh chat nen tren re cay, trong khi cac cua con A. pisonii chda
day la nhdng yeu to moi trdcing quan trong nhat trddng thanh ddpc tim thay trong re ngam.
co the anh hvlcfng den sd phan bo khong gian cua
nhieu loai giap xac (Frusher et al., 1994), dac biet
la cac loai cua dan (Macintosh, 1988). Hai loai cua

Uca leptodactyla va U. rapax ddpc tim thay song
d nen day co ti le cat trung binh, U. thayeri ddpc
ghi nhan 6 nen day cat min va rat min, trong khi
46

Hau het cac loai Malacostraca co xu hddng
tdOng quan thuan nhdng khong co y nghia thong ke
(p > 0,05) vdi ham ldpng TOM, ngoai trd loai tom
tit S. mantis tdOng quan thuan co y nghia vdi ham
ldpng TOM va do man (p < 0,05). Loai S. mantis
phan bo d do man td 18 - 19%o, nen day bun nOi


Tap chi Khoa hoc va Cong nghe Nong nghiep Viet Nam-S606(127)/202 /

ham lddng TOM bien dong td 3,3 - 3,6%, cao hon
so vdi cac diem thu khac. Day la loai co gia tri kinh
•e cao, lam thdc an cho con ngddi, phan bo 6 nen
day cat - bun va bun - cat. Quan the cua chung dat
dinh cao vao mua dong va thap nhat vao mua he,

sd phan bo cua chung thi tdong quan khong co y
nghia vdi do man (Vila et a l, 2013). Loai tom nay
co tap tinh dao hang nen thiidng thich nghi vdi nen
day mem ven bien, noi co nen day la cat min va bun
cat (Atkinson et al., 1997).

Bang 2. TUdng quan gifla cac loai Malacostraca vdi do man va TOM (n = 48)
d rdng ngap man Cu Lao Dung, tinh Soc Trang
STT

Ten loai

Do man

TOM

1

Gammarus locusta

- 0,095

0,030

2

Alpheus digitalis

- 0,177

0,016

3

Acetes indicus

0,109

0,012

4

Macrophthalmus japonicus

0,096

0,173

5

Macrophthalmus depressus

0,408”

0,178

6

Uca sp.

0,458”

0,223

7

Ocypode ceratophthalmus

-0,123

- 0,029

8

Pseudosesarma moeschi

0,283

0,149

9

Episesarma mederi

- 0,077

0,108

10

Aratus pisonii

- 0,076

0,021

11

Cirolana sp.

0,030

0,047

12

Limnoria lignorum

0,335*

0,177

13

Squilla mantis

0,356*

0,307*

Malacostraca

0,160

0,147

Ghi chu: *Tt(dng quan coy nghia d miicp < 0,05; ** Tiidng quan coy nghia dmticp < 0,01.
IV. KET LUAN

TAI LIEU THAM KHAO

Nghien cdu da tim thay tong cong 13 loai
Malacostraca d he sinh thai rdng ngap man Cu Lao
Dung, tinh Soc Trang. Do man co anh hifdng dang ke
den sd phan bo cua cac loai thuoc ldp Malacostraca.
Mat do cua Malacostraca bien dong kha cao gida cac
diem thu mau (0 - 57 ct/m2) va co xu hddng tang cao
cung vdi sd gia tang cua do man vao mua kho. Mot
so loai thich nghi vdi do man cao la M. depressus,
Uca sp„ L. lignorum va S. mantis. 6 nghien cdu nay,
hau het cac loai tddng quan khong chat che vdi ham
lddng TOM, ngoai trd loai S. mantis tddng quan
thuan co y nghia vdi TOM. Nhin chung, thanh phan
loai Malacostraca d khu vdc nghien cdu tddng doi
thap nen can dddc bao ton nham duy tri sd can bang
he sinh thai trong thuy vdc.

Thai Thanh Diidng, 2003. Mot so loai gidp xac thUdng
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LClI CAM ON
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Nguyen Thi Kim Lien, 2017. Nghien cdu phUdng phap

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Effects of salinity and organic m atter on M alacostraca composition
in mangrove ecosystem of Cu Lao Dung, Soc Trang province
Huynh Truong Giang, Au Van Hoa, Tran Trung Giang,
Duong Van Ni, Nguyen Thi Kim Lien

Abstract
The effects of salinity and total organic matter on the Malacostraca composition in the mangrove ecosystem of Cu
Lao Dung (CLD) was carried out from September 2019 to March 2020. A total of 24 sampling sites are divided into 8
groups of water bodies. In which, 8 groups (sites) belong to the inner area, and others are coastal mangroves of CLD.
The results showed that a total of 13 species of Malacostraca were recorded. The distribution of Malacostraca was
strongly affected by salinity changes in the studied areas. Malacostraca density has fluctuated relatively high among
sampling sites. Their densities in the dry season tend to be higher than those in the rainy season. Species including

m


Tap chi Khoa hoc va Cong nghe Nong nghiip Viet Nam - So 06(127)/2021

Mmrmphthalmus depressus, Uca sp„ Limnoria lignorum and Squilla mantis have a significantly positive correlation
■ ih salinity (p < 0.05). In addition, most Malacostraca species have positive relation but are non-statistically
significant with TOM concentration (p > 0.05), except S. mantis species. In general, the species composition of
Malacostraca is pretty low and needs to be conserved to maintain ecological balance in CLD mangroves.
Keywords: Malacostraca, salinity, TOM concentration, Cu Lao Dung mangrove
Jigay nhan bai: 16/5/2021
Ngay phan bien: 05/6/2021

Ngifdi phan bien: TS. Le Van Khoi
Ngay duyet dang: 29/6/2021