JouRxAr- oF TRoprc,{L BrcL.rcy AND CoNsERvAToN. 3: 85 - 102. 2007
Research arrticle
Characterization of the Roo6ting Sites of the Golden Crowned Flying Fox (Acerodonjubaus\
atr.dPhilippine Giant FruitBat (hercpus eanplra$) s\d' Their Eff€cts on Dipterocarp Forests
Fd$,in O. BRDGANZAT and Grec€ B.
VILLAMOXI3 IEcolDg)
Centrc, SubicBat Metropolitan Adhofty, Olongapo Citt, Philippihes
'zWorld
Agroforestry
Centte(ICMF)-
Philippines, Las Bafios,Iasum, Philippines
ABSTRACT. In determining
the causosof
moriality
inwhite
lauan ( shorca contofta) the bat roost area, physical observation and^
soil physico-chemical
analysiswere
done.Likewise, the physico-chemical analysis
rcvealed that there is nosignficad
differenceon the soil nutrient in boih
rcostins
and non-roosting site.
Hence,this finding confirms
that bat droppingsmay
not be the causeof
death of the
White
lauan tre€s.Data analysis shows that vegetation structurc
in
the bat roost area issignificantly differcnt with
that ofin
thecontrol
ploas or non-roostarea.
Suchfindings
were accountedfor
thelimited number
size andmaturity of plant
species found in the roost arca. On lhe other hand,the roost
area canbo considercd
as disturbed forestwith
the preserce of pioneer spe.ies and gapfomed
by dead treeswhich drive
the batsto move to
theinner part of
rhe forcst.
The tight roosting characteristic or activity
of
bats on the branches and twigs that rcsults
to
d€foliation
of tre€s is suspectedcontributory facror in the mortality of
thewlite
lauanspecies as supported by its sensitive characteristics such that they become
intolerant as theygow
to maturiay. To address the issue, recommendatlons were providedfor
theconsenation
and managementof
these endangered and tbreatened species.INTRODUCIION
Therc
arcmorc ihan f,000
speciesof
bats worldwide. They are theody
Ayine nammals in theworld. Many
of thenr are nearly going extinction. From 1986, only f2 sp€ciesofbats
were list€d underruCN
red list but after a span of four years, 54 species $€re listed andfour of
them had becomeextincl by
1992 (Ang, 1998). ln Southeast Asia" 63% of thefiuit
bats aretbreatened. Among
the largeftuit
batsendemic to this regior (genela Acercdon, Dobsonia, Pteropus), 75%
are threatened O4ildenstein, 2002). Old worldftuit
bats, also calledflying
foxes, are members of the single f ,dn1ly P t en
p o di daei\
tlrcnz I
a c h i r o p t erun suborder. These bats are distdbuted
thmughoutfte
Oldlvorld
fiopics, flomAfrica through
SoutheastAsia and in the South
Ker words: Shotea cortotta, Acetodon jubatus,Prloplr vdpyrur,
endemic Pldlippirc bals*. breganza-ed @yahoo.com
clffirrtrd
orrrc
RoosrNGSB
Px.ificklmds rucN €000) liEd oyer55%
and
cum nyins
rox(Pr.rorlr rrkdr4 hrvc
disappearc{r .odpr.tely dn. to na$iv.
hundos. Bd
is one oa rhcsorcB
ormet in
thi sd ti Thailrtrd. lhe nying loxes
(r,nrd€;r rprar) r srimed dd opdry
sold
h
rhe publicmekeb
(Ang,193). Or or
Pas saved fton ?n;dion bY ns loc:l
to sop rh. d*hcnon of rh.ir habird
3ndlnlhePl'jlipphs,liwdedlg$?3spei4
of
batsor{hich:rretuiibab s;liP.rhr
or
rh.
25r4ognizen spe.i6 of frun bds m
{uctrl.
2000). Tne Panaynlitbd (r.,oro, ,l.!ls)
ha:Dd 6ei kd sinc t993 vNle
ihc
bm
brckcdbd (D,rr,,ia.idrrarD
anddbe
noredbd (rr'F.dn. roro.i)
orN.cr.
ee now conside.ed eniicr * r csux or d$luc.ion
or$.t h$iht $d ovd
huntitrgIolosumplronby$nelcar''nabitb
Tod,nlwosp.i.solnyjJ'efdsrefomd
in
rheroAted nounbin of
SubicBry txd Giri' Ftr B or de cibr Flyins For
(L{.j!d6) n
'nc
lsad win\ r wibssps ofup btwomdffs'weighing'Iomlbl.5kgmd
Eddishbo*n turcoqins
rhero€herd,neck, Ph iPFner (Fism D
FlyiisId (, wrpa,
is n\esondlalgst
md qeishs I
kg.I.
ba!|
gorden pxr.hof ir
on ib foEhed
rha!oft.d nmwr b€r*c.i
disdibution is southemr Asia (Fisure 2).
Ahhousb conser.tion rts of rh.
irs
rtlbor colden cmwned nying .d n
iiEadv lined d
end:Dsered(Mi.Llcbra[
.r ar,
r994
IUCN, 2000).Rouch.srimt ot 6eSubi.lay\
nyidg lox colony siz. in 2004r
30,0m individuak(SBMABdcomr
2004),Todar tlyids roxa tu. rbiatened wnh
uEsulatd hunting rnd
contiououslos or
nnor drh4hdmd ii serar hal o keb
rd rssunnt.
Bahm .6y
huntinsb€.!
in rhe
rildJoriod4Enous
and non-iidit@dDg
Filipind, Cov.mmen! focu..s tu
barindigeio$ ssup, ha
bcengiv.n
rb. dgbtro
A
sbdedd.by Mld.i.lin Om2) idenril'.d
ocusdni*hqthiiiluehlinfominoi6
limir pox.bidg
bylrhllidg &e r,Jgd ms.
rorc$&lrrddiotr e
mcouobdh foredfi G,
rimbdh,ftrtiic,
irrcg,r rogging.ttr.l
wood,6N.rionbaEjflllualprcddioD{as
Ttc dipGmca! specis in $e Philippin* is suffenig f6d dvr.xproiudon foric rifibrt (Ashloi. 1993). All ot
rhcsesp.cies m sdd'jcbu'.Philippin*'tenmsul
subicBayFoa Resene(SBFR).
]n on. df rh. br ioo!'ng,rerN ii sBR
showed rhd rhe while huli (slo.€a
.,",r',) de
useda moi ks dd oilen
Edwin O. BREGANZA & Grace B. VII-I .AMOR 87
f;jgSonus vampyrus
Figure l.
Speciesdistrib\ttlot
ofAcerodonj
batur in the PhilippinesFigure 2.
Speciesdistrib\iiot\
of Ptercpuswmpyrus in Asia
33 4#vrur fr nF D,ftrrdr Foijs
now tuund
affEted ii
the area. Nor htrchi,
kno{n
abour rheimPkt of b tu!
odre
.ffed
orbab
ontes
isnc.ded
roswe
asLaur
sdwidring P.Puhrion
ThclonoyingG'heobledivsof$e{udy:
Z
Todebmiic
rhccstrss ol non'riq in
whire laum res (si,ru. r,,t,,a)
at3. To deyelop lppropridc mrn4emeDt aoldencs*oed
Fiyins Fox (1.j!r,en,
Philippine
Ciad Fruit Bri (P va-Du r r,'?"rtu)
'nd ften m{ing ded.
Tbe Subic Bay
Fo6r R*de (SBFRI li.s
onBioseosnphic zone. sou$weneo Luoi.
ddisnoEdfolhighlewlofdivdilyhd
.nd.nism, {hich mak* it
apnoriry
si@ ror$ilblmolc.iennydaybd.ylodmd
senenlly acidic. rE bpolnphy of
rhe areaepdded
by ridgcs.Iicftids
fmmsa
level ML sd.Rib ad $n
3ea(sird.2003). Amuar
njifr]lh3,532mwilhnjiy.@inmJU.
ro
ocrob$
(3e.4er)(uRs.
2001).rhe B' or
rhe
yes
dry, wirhJarury
roMeh heirs
SBFR n
ro$
ro the Philippine Gimr Fruit Bar ,nd$e
Gold.troowned Flyiig
Fox.@rine
The whne lau is ooe ol $e dominanr
3peies indipr.carp f'Br orsubi. Bry nd
b,b GrRs,200r
N circdinrojo odAngms,
l ee?). Aside
nln srwing wel
up6
I heishrrusing rtun
45b
60 mad
ahnk diamder
hrbihr
rorwildLn sp*ies (cm,pin,
1s35).I
trcn
above seaIevd (uRs,2001).
ror bolh
non dd faum. Fedmdo (lee8) ha
m on smpline
onrso nudy si'*:
(1) rhebarmo"e!
d (2) therrcroutide orrco$
st.
rordc 4 $e.onftl
(Figure4). Tnr
TneiudymlwAdivjd.djnbeddlins'
Edwin O. BREGANZA & Grace B.
\III-AMOR
89nnost are'i
Legend:
- -- Trmseetlilc
o - ----^
sAl1pLLng pr orsFigure
4. Sampling Plots in Bat Roost Area andConrol
Plots and plots were located every 100 meters alongeach line. The electrical power line
from
the Navmag sentry to Upper Cubi Housingwith length of about 580 meters was used
as reference line/base line since it goes through/traverces the bat roost area.
Each
plo.
was establishedusing
a compass and a meter tape. A11 dead tees locatedwithin
the 10 meter wideirail
path duringtrail plot
est2blishment wefe recorded.
Ten plots were established in the whole
rcost area.
These sampleplols
coded asI to
10with
areaof
lOmx
10m were established.In
each sample
plot,
heights ofall
specieswith 15 cm in tlunk diameter and above
wereidentified. counted. and neasured. For
unid€ntified species. leaves were collected
for
lateridentification. A
5mx
5m subplot was also located at one cornerof
the 10mx lon
plot.
In this smallerplot.
all tree saplings 1 5 centimeterin
diameter andbelow
aswell
asother
specieswere ideniified,
counted and recorded such as mttans. bamboos and other plant species.Furthemorc,
alm x lm plot
was also located
within
the 10mx 10mplor.
Here,
all wildlings
and other smaller plants (one rneter andb€low) within
theplot
were likewise identified, recorded and counted.Plots
#
8 and#
9in
theroosting
area were removed dudng data amlysis since th€s€ plotsfell
outsideofihe
roosting site. As such,ouly
8 plots were considered in the aDalysis.90
Cn
RAcrrRrz{roN oF rnE RoosrING SIrEs oFAcrnoDolv ruBAUs aND PruRoPUs VIMPIR'S IN THE DIPII.ROCAI? FORESTSSix (6)
sampleplols
were madein
the.rea
oolsideofthe
roost site.which
serves as thecontrol.
Asinple
random sampling was used to allocate tbe plots in the area(No rcference).Each
plot
was localed on the ground using a compass and a meter tape. The same procedures and plot meas rement were used on this area.Dead White lauan trees that falls within a
plot
werecounted. Soil
samples were tsken and analyzed tofind
outif
the soil nutrieni is the one causing the death of these trees.Soil
sampling
Soil
samples were lalrenusing
asoil
augerboringequipnent. onekilogrameacb
of soit samples was taken atdifferent soil
depth asfollows:0
20 cm.20-
50cm,50 l0ocmand 100 below(Figure5).
For
the bat roost area,3
sampleplots
weretaken on pre-identified
locations under (1) deceNed,(2) dying
and(3) healthy wlite
lauan tree. This procedure was done to
compare
if
the soil nutrientwirhin
each treeOn the other hand. two sample plots were also taken outside of lhe roosl area. One plot was
taten
on the lower slopewhile
the other one was talcen on the upper slope of the area.DataAnalysis
For flora
analysis, Shannon and Simpson's indices werc usedin
delermining vegetationdiversity of
the area.To
test the hypothesisthat soil nurrient of the roosting area
isdifferent
to non-roosi.tlle
t-test was usedto determine ihe difference or condiiion of vegetation
betweenlhe roosting
and nonFor soil analysis. samples were brought to the Bureau
of Soils
and tbree basic paramelers such assoil pH, nitrogen
and phosphorou!were analyzed. Using the same hypothesis, a
Chi
square test was used to compare thesoil
chemical contentof
the roost and non-roostFigure 5.
Soil samplingactivity
Edwin o. BREGANZA & Gnce B.
VILL{MOR
RESI,'LIS
Vegetation
Analysis
Krp,.nE
ea*ia
roxbutghit) and White lauan(Shorea contorta) were observed to
be present in most of the 10x10plotin
the roosrarea. Similarly.
both species were the most frequenl and highest in densiry.White
lauan was counled the mosl numberofindividuals foilowedby Kupang.
However. Kupang wasthe most dominant species in terms of
importance value seconded by White Lauan.
lr was observed thal Kupang could
accommodate more bats than
wl
te lauan.A
i00 cm diameter of white laxan can
accomrnodate 150 to 200 bats or more
while
the same diameter of Kupang
can accommodaie400 to
500 dependingon its
There are ten
idenlified
lree speciesin
both the 10x10 and 5x5 plotsin
thecontrol
plots andonly four
speciesin the lxl plot. In
91
contrast,
in
theroosi
area. there are twelve identified species in the 10x10 plots.23i.
thc 5x5 andll
in lhelxl
plors (Appendixl).
The obtained increase in the number oI speciesin
the roost area compared to tbe
conlrol plols
can be altributed to the gaps or openings madeby falling
branches and deathof
thewhile
Lauan species(Figure 6). It
was obseNed that most of the spcciesin
the roost area are pioneer species as a resuli of the gapsfolIcd-
The
original
roost siieis now
dominaledby
bambooparticularly the Blkal (Dinochloa acutiJLora) and b\tho (Schi.ostachrum lumampao). These
speciesbelong to the
grass farnily
tiat
can ihrive in open andinfeaile soils.
Grass, such as bamboogrow
earlyin
the succession, they have a distinct competitive advantage over the later
geminating and slower growing malure phase of native species (Kooyman&
Faught, 1996).Bamboo invasion is one sucb blocking influence
andis probably the number
oneongoing
managementproblem for
anyoneinvolved in
regenerationof local parks or
protected areas such as
in
Subic Bay.Fisure 6.
Photo showing dead White lauan trees and bats roosting onlive
treesCH^MmhnoN
or rH!Rtusrtrc sir
orhs
specieslike uoko tMeronr c,.&ial
Rdan (c,r,,icr rp.), Pal&sm (c,r,nb
nt ttta, chrj bhen! abrctu rd othet
sp{i.s d
n\erdi mr ffip.rod b
rhe,rcr Mo* ol
drese{e
lishL cre ed 6y dead trees. Io plan.
Kormn e rrustu (lee6) cn.d 'ba',
whcn
3rp
ixcE&d in
rhe canopyor rh. mrm
slplinss or rhe naruie canopy rrccx n
src*inscmopyEs e
ablero.iisr rondy yefs hdd rh.
shadeof
'he snopy ju
vegerdion in
rhemniog sie
for rher0xr0 roonins or conror plor
assho*n or 6e .rrdur,'ed r-€$ crade r). Tfiismry bedE lwtug :E. r-ikesisq srll 6
15mand
belov lor
the 5x5plob dd ond gb*n! toi rh. rxr Prok ii rhe roo*in8 ar.a r.
signifi
cmdydirf@tnomlhcnon-m ea
conpN
ro nonioon,rca
Table 2sho{3
m.
nbigbd $m
mecdhl plor. Thh.m
be b.! erphined ro
theob$r ion d
pioEr sp{i* a(upy
rh? sap6fomed by
deadtre{. clceoricrllyi rcos sne is r di$ft€d fo6r beus. of
rhepEstr
cof Nmbelofd€ldMsopeiedjdu$edals ft.eidd@
sheHst, ftm
rh.sdi dd
rhisrddnioi f,vo6
lnestu*rh
andsuNivd or pioo.d sp{j*. oi rhr ona h d, fdrhe
drd cnopy
ordis!!b.d foEd
sucha
rheconrdr
pros,youig fgemtur m Innod.
T,ble l. spcderibud{einMsdog
d mDlsriq sib (aca)
. llleroo*m,ftdconrolplobdifieEdsigoiJicmdy(P<0.0s,k!)
condDlob
ft.\
> r5cmdbhooxlo plots)
re*<l5cm
dbh(5x5prbh)
rptosqninc
dydifrded
(p<0.05,!re$)
Moe
orrh. .n.rgy conins frcn
rhe sun arctapFd*theuPPel.mpysndonlyaminft
onddeo*lh,
rhNliniting tE sturhofplsh
Tnc6 oli\e sil ch.mhsl mly*
showsthar
no{ dI de plot
hrve rhesme
levelof eil dftiens (rrble 3) so
pH rorbod
sites mngeiron
5.2to 6.16. this ntrge is nil
fedfid. rn
&e plsnb alrhoughsuchpHleyel
i3 oo rhe boundaiy
ofb{ohing sidic
pha i! ddi!.ly dE 6
emhoer Pbr D
rollov.d
bvnor I
wnh 0.063lmsr
Irrya
UItu or rnimL m.ordins b
Forh (1e51), rhe$il.
Hecir.d rh rh.E
is morenitosen lxecoilinuoosdeposnionolbdu.neand
d.nsctu contibub aldin rh.@unultim
ofs rEe *irh r.onscqnent los of tuit
pmducrion
(Jones,le66). tsowev4 hs
(1e66) cit.d &d
'heF
ir
nosh*p liic ro
Trbl.l. (o{!oeflct,ftb . o''h.
Plot I
(sple bleb
onlo*er irdpc) aot
?(snple bken or uppd slopt)
Nsanprcbkm
under de&d$hite
lauante
:lsanple r,Ln ud{ hsllny mit huh te
*lsmple hk.n mder dyilg wit lrui r€
'r'bL {. Nitogcn
level indillemr
soil deprhFor L\e phorphorotrs
contnr, Plot I srhibirs
'iehigh*Dhoslhddsmbd*i'nll'?5
follo*cd
by Plor Ksirh
9.55. ALthotrghnor I
on rhe
ryd,g. hd
thchigh*t
Pmden|
Plor(hslh.hilneiPd020cmsild.plh
(Tablet. mh roy
b€ baauseenples verc
bar rco*ins on top Bd dioPpings
o nbre
a ro,in pb6o ouso to.
l-inedall inebdms kabout5ce ift rec
mosha. Mi nal lirFfall!s obs.ded
atlhe.mter or
theb roon sine rhe er or lld ac .lreldy
deYoidol leavs.
Raut orchi squre BI (r,bre
6) shows rhrhde
is nosisnilic. difidtrce in
rhe sdirNried.dtit in
borhNstire d ion
sEar nmber or bds hangiis roeethd
caod.pending otr
ibb@ch*. oirheorh hod,
to
500bsh
becauseor n! sid.
3ndspftad
tuoi rish y p!.t.d tos.rher on rco$ing
tre* (Mild.ileiq 2004). Bsed dn ri.ld
aod big bran.b*
d.mased
andf,ll.n
on rhesrcund oi e
Mdhrde or nuky dddr n v.iY distinct
b{ofrig sbng
in rheinns pd ofrhe rc.s
by rhc
lqe dm,ge
on rbebmch$ dd
Trble s, Phdpbror
level md'ffft r d.pln
na
5d ndjoodirs
snes(chi-sqnre te$)
r
.N. sicnificdr dififfic. berwci $. mstus a,i/onhlplos(P<0l.*Fn)
mt orn\e leav* dd bmchd
O0 ro 15ch dim#) ii df ehd
ormercstead 30
ro
90* d,mged. Ai$oug! bds
moveiion
oncffino
odFr.ln.y shy lsserd rhir
diginal @ rtr I b
2yffi.
TneYEtM ro
dEn
uiginalNi.g ean45 b lomo
hsBy
thdrj& moslru @s tlr.dY luveEd ftm ln. se$ .xep. rd $me wlib r:uo h6.
Irvs'l¬d rh4cdc.ndion 6l
bab
d h.rvid d hishq in th. dd ofrhe
babimr. Assuch,ptsFcsft sisnuch
Bsr ft noving ddrly sourhdh pd ot lc'vs dd b.rct* indlhendoppings lhov rhd
theye mviDg b
tncind
Panol lhs
ra, Moi.ovei tber. ,rc no tuscs or
cvidm rhd lndc 8p@ia ftned b dtn
origin,l roo ing t..r 3s ol rbe d:te of
ob$d:donfEm J trr.y2mr b Mnb
2003Dldngplot.nablisbmr
in JdusJy 2003, 14dad d* vcE Fdd.d id
tbe'Gt :g.
concenhrion
of d.adM
furdr.d d rh.
romd m$ ma pdlcu]fly m Plds *
6, 5 md 7,Tne plds hrl
wtrhjnrha@oh ol&.
rlmdffir?E. BepEl|rbM*oIv.
iarhd rhsn d.id t .s Because of rhis
rfibdq tncy
'bbdo. rbe te. one ir is d*rdy d.'d d.lcvoid oflav6. somft*
suiaive Hov.vd, m6t of whih hnm,
beaur.
orrheirsnsidvech&tuisiis,
suchrhd rh.y c blctu! wbd
young, but theyb.om inbLmt d d.y smr b nituitY (aespi4
Ie35),va d
lbleb @vd ttrer
SUMMARY,INDCONOIFION
Physi.o{hmicd
malyris orn\c soilFvakn tut d'.e
ism sigtn.d dinercnc. m thc
soil nuEienr
6nd! ii boLhffiring ddnd.
lGtiogd.s.Tt
efoE, ba!dogpiig! nly
no, bc
tu.aN.
or derinofrr W E ln@
ol tec ri*u. dsrysis
isEol:mnded ror
Bseno d@ e,lysis, Esebrion
in thEtuos
d i.3ignificddy diflcFnt virh
rhecoibl
ploa tr m}ffit ei. lx. rifrir.d
mberof
smll plmb
in rh.ndn'ffir ftaindicd*
rhd rir 3E h
5mtuF md cloFd 6oPY b. c'Gsonzd 6
' disirJbcd loE$
due6
tbc
pu.m ol yous Egeo.mb rnd
8!PElomed by d,{d cs. opci Qac. or grp vhich
is limired io.loE c
opyforc$, giva
oppotuDi9 ro .dill legddon or pioner tu . Ix. pEs.ne oldeal@8
ddc tomr
Fin'nn mnarity ot
ihcwnir Ldm d ih.
bd rco$ uea
could bearbibutd b r,bysiel
f.dordu.lotiefuImti4clwad.n$icor
icdvity of b*
inarHult b ddoriarid df lIE.
AIL\ougb$is b.lEvior orbdis n2trnl.
irbs
aftg,riv..frdtbrivntu hm. Belw
ot the
lmiriv. chdscnsdc
orwl'il. l.us
run ${ lh.y b.com inblero! 4
thoygDv
bnrfuil,'$issp*i6islllemon:fletd
by
rb. mo*ins etivilid of $c blt.
MAMGFI'ENIRDMMMINDAiION
be
dirtc b6.d
onc.tuinfacton tbd dunb.
giv.n pdm coDsidedim
inqdtrto Abblilh
I mde varid ju$iric ioi b *hich
mtrflalion efior6
shall b€dwded Itat n'ddglcled.dld.finitionmdput'ug
clpabirily ot
rherpeies b b. cmsd.d.
l. Erichimr plmrins
could be.@d in
fts no lonser Gcupi.d
bY6. hab,
CHAmBtutroFflERG csrBdEA.@tuus^rcPtuarus
96 y-ms ln Tm DmERtu Fodrs
smwbg, aide ftom b.ing bencticirl b r The SBMA as rhe &tho y 3hontd
r inrclsiry
itspore.don diviti* Knnd
e. dEtcrins,B rndldion ofsjsor€s whic ldm ,nd orhrt .id.dic 3q@ier
otrdified sMbgic lmdions .outd bc
a. & inr'mrddi dd ederioD c p{isn
sirricunusrrEde likelibtratioD ftrrhiscohmariderivit
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REFIIINCES
2 Movddorbarmlonylrcnod.place tus,tA.oeetls,,i4ilEoz'ro&,sav',s
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of lhef@s
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Rt&!. Oet2). ou w,ldI1rit baB: aa
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sneM. Ho*ever,
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3 SBMA rcforcsb'jonpmjd ejrhiifit o$effiat
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ol t4ts. Fttins Fder ni4 rddto
kt m
to
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Mrrd.Bletn, T.L, & S.C. Sde.
(20112).Bdt.amt
2002:Fitl'tt p.d,$bic\'y Metopolir!.
^uthorjrY
(SBMA),
sti.t s.c.l2{6.t. Dietaa iabis
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