1998, 18 (1): 1 7. A cta T heriolog ica S inica (,, ) (Grow th layer group s, GL Gs) 168, 42,

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1 1998, 18 (1): 17 A cta T heriolog ica S inica Ξ (,, ), 3,, 3 C (O dum, 1983), 0 2, R 0 Κ1, rm 0,, ; ; ; ;, (Sh i2 rak ihara, 1993; Gao, 1993)Gao (1993) 3 56,, (, 1995),, 3,, , 86, 98, 45 (Grow th layer group s, GL Gs) 168, 42, 81, 45 (1992) ( ), Gao (1993), ,, Ξ, ,

2 , 1. 2, 3 (1, 2, 3),, (1 - A, B, C) 1 T able 1L ife table of finless po rpo ise population of the Yangtze R iver x nx dx lx qx ex > x: ( : ) A ge class (unit: year) ; nx: N um ber of specim en at age class x; dx: N um ber of individuals dying during the interval age class x to x + 1; lx: x F raction surviving at age class x; qx: x x+ 1 age2specific death rate; ex: x m ean expectation of life at age class x 2 T able 2L ife table of finless po rpo ise population of the Yellow Sea x nx dx lx qx ex > x, nx, dx, lx, qx, ex 1 See table 1 fo r the exp lanation of x, nx, dx, lx, qx, ex 3 L,, O dum (1983) C, 810 (dx), 02, ,, 10,, 68, 810, , 2 3

3 3 T able 3L ife table of finless po rpo ise population of the South Ch ina Sea x nx dx lx qx ex > x, nx, dx, lx, qx, ex 1See table 1 fo r the exp lanation of x, nx, dx, lx, qx, ex,, T able 4T he intrinsic rate of the Yangtze R iver population x lx m x lxm x xlxm x > R 0= lxm x= ; T = xlxm xgro= g018537= 9154; rm = lnr 0gT = ln018537g9154= ; Κ= e rm = e = T able 5T he intrinsic rate of increase of the Yellow Sea population x lx m x lxm x xlxm x > R 0= lxm x= ; T = xlxm xgr 0= g016364= 8166; rm = lnr 0gT = ln016364g8166= ; Κ= e rm = e = (1) (4640) (1827) X 2, X , X 2 1, 0105= 3184, 11 3

4 (95% ) (5939), X 2 = 4, X 2 1, 0105= 3184,, (A )(B) (C) F ig. 1T he survivo rsh ip curve (A ), death curve (B), and death rate curve (C) of th ree finless po rpo ise populations 0170 (2) 2 (, 1992; Gask in, 1984; Kasuy, 1979), (m x) 015, (Sh irak ihara, 1993), m x 0150 Sh irak ihara (1993) 2, 10 6, 1, m x 017 (1992) 1, 7, 5, m x 017,, m x 4 (Gao, 1993), 04 m x 06 (Gao, 1993), 4 6 m x 05 (Gao, 1993), 4 6 m x 0135 Sh irak ihara (1993) 21 23, 23,, 4

5 > 16,, > 16 m x 0135 (3), 3, (R 0) (rm ) (Κ) (4, 5, 6) R 0< 1, Κ< 1, rm < 0, 3,,, 6 T able 6T he intrinsic rate of increase of the South Ch ina Sea population x lx m x lxm x xlxm x > R 0= lxm x= ; T = xlxm xgr 0= g015389= ; rm = lnr 0gT = ln015389g8130= ; Κ= e rm = , R 0 Κ 1, rm 0,,,, (T ), (Kasuya, 1979),,, 3,,, rm < 0 (),, 2. (, 1992; Chang, 1995; Gao, 1993; Gask in, 1984; Sh irak ihara, 1993),, (, 1992; Sh irak ihara, 1993) 0170,, 16, 615% ( ), 313% ( ) 212% ( ), 16 Ε 16 5

6 ,, (0135),,, ,,,, 45, 3,, ( ),,, (nx),,, , 15 (2) : , 16 (4) : Chang Q, Zhou K The grow th and rep roduction of finless po rpo ise N eop hocaena p hocaenoides, in the Yangtze R iver and Yellow gbohai Sea. J ou rna l of N anj ing N orm a l U niversity (N atural Science), V o l 18 (Supp lim ent) : Gao A L, Zhou K Y. A qua tic M amm a ls, 19 (1) : T he grow th and rep roduction of th ree finless po rpo ise populations in the Ch inese w aters. Gaskin D E, Sm ith G J D, W atson A P, Yasui W Y, Yurick D B Rep roduction in the po rpo ise (Phocoenidae) : Imp lication fo r m anagem enṫ R ep in t w ha l comm n, (Special Issue 6) : Kasuya T, Kureha K T he population of finless po rpo ise in Inland sea of Japan. S ci R ep W hales R es Inst, Tokyo, 31: 144. O dum E P Basic Eco logy. Saunders Co llege Publishing, Philadelphia, U SA. Shirakihara M, Takem ura A, Shirakihara K A ge, grow th, and ep roduction of the finless po rpo ise, N eop ho2 caena p hocaenoid es, in the coastal w aters of w estern Kyushu, Japan. M arinem amm al S cience, 9 (4) : A STUDY ON THE L IFE TABL E AND DY NAM ICS OF THREE F INL ESS PORPO ISE POPULAT IONS IN THE CH INESE W ATERS YAN G GuangZHOU KaiyaGAO A n lichan G Q ing (D ep a rtm en t of B iology, N anj ing N orm a l U niversity, N anj ing, ) Abstract A study w as conducted on the static life tab le, rep roduction, and population dy2 nam ics of fin less po rpo ise (N eop hocaena p hocaenoid es) from the Yangtze R iver popula2 tion, Yellow Sea population, and Sou th Ch ina Sea population. Static life tab les of th ree population s w ere con structed, w h ich gave rise tol 2shape su rvivo rsh ip cu rves. D eath 6

7 cu rve and death rate cu rve, show ing som e fluctuation s, w ere differen t among popula2 tion ṡ T he sex ratio s of all th ree population s w ere no t differen t w ith 1g 1 sign ifican tly. T he R 0 and Κof all th ree population s w ere less than 1, w hereas the rm of them w ere less than 0, indicating that the population num bers of th ree population s w ill decrease in the fu tu re. It is necessary to enhance the con servation of fin less po rpo ise population s. Key wordsf in less po rpo ise; Population; Static life tab le; In trin sic rate of in2 crease; Population dynam ics (73) 6 (% ) T able 6Effects of different energy density and p ro tein level of concentrated feed on digestibility of dietary CF GE (M Jgkg) 1F irst stage 2Second stage CP (% ) GE CP (% ) GE X ϖ E X ϖ E a bb A a a A ab a A a b B CP X ϖ A A A A P 5 N o te w as sam e as table 5 3. (1), (2) (3) (4) (5) ; ; Key wordsyoung sika deer; Energy density; P ro tein level (,, ) () WAN G FengJ IN ShundanGAO X iuhuayan G Fuhe (Insititu te of w ild E conom ic A nim als and P lants, CA A S, J ilin C ity, ) WAN G P inghao Fuchang (S huang Y ang stud F arm of J ilin P rov ince) 7