A study of Lucifer faxoni conducted within the estuary of Potengi, Natal, Brazil, utilizing the pier of "Base Naval" showed that these planktonic organisms were present in the zooplankton samples

Barca, F E N V

Sankarankutty, C

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SOME OBSERVATI( DECAPOC IA: SER @out the the i n a i  imem werc QNS On i LUCIE 3NZ BORRADAILE (CRUSTACI .GESTIDAE) COLLECTED FROM A TIDAL ESTUARJ A study of Lucifer faxoni conducted within the estuary of Potengi, Natal, Brazil, utilizing t pier of "Base Naval" showed that these planktonic organisms were present in the zooplankton sampl thro~ day, though they we1 ,ening when they enter the' estua with ming tide. All size sample but a great majority sped : in the size (length o 1.10 mm (male and female). ESllD sh . are repn . w .e more ab~ groups we) of "neck'') undant tow; re represen range of 1 THE SERG rimps of the genus Lucifer Thompson aented in the Atlantic Ocean by two specles, L. faxoni Borradaile and L. typus H. Milne Edwards. These two species, though have the same range of distribution, the former from 43"N to 23's and the latter from 42'1 )"S (Hol Z9), their pattern of :ion is d. . faxoni is considered c species ected even in the estuaries, whereas L. typus is recognised as an oceanic species (Bowmann and McCain, 1967). thuis, l! istinct. L ; - ~0111 gh a gr Dn the s ...&aA A, Thou eat deal of information is available ( pecies of Lucifer fmm the studies alll-~ "ut in the North Atlantic (Williams, 1965 and 1969; Woodmansee, 1958 and 1966; Bowmann and McCain, 1967; Harper, Jr. 1968), the study on the biology of L. faxoni by Mpes (1966) from the region of Cananeia, Slo Paulo, Brazil is the only detailed account available from the South Atlantic. An intensive sampling of zooplankton within the estuary of Potengi, Natal, covering a period of 24 hours provided some interesting in n on the population of L. faxoni. ~formatio: The a ards the ev ~ted in the 3.81 mm tc Technology, Brazil) for the support received in the form of fellowships. We also would like to record our thanks to the authorities of the "Base Naval" in Natal for permission to utilize the pier for our sampling. MATERIAL AND METHODS Poten q $ F  luthors are grateful to CNPq (National FIG. 1 .  Map o f  the estuary of Potengi, Natal, Brazil Council for the Development of Science and showing the sampling station. NOTES TABLE 1. Phv~ico-Ghemi~aI Parameters UY...lity -P.P.M. Oxygen - (mln DATE stained at three hours interval I J G ~ I I U I I I I ~  lrulll dovember 8, at 06:OO hrs. and ending at 06:OO hrs. on November 10, with a twenty four hour break between 18:00 hrs. on November 8 and 18:OO hrs. on November 9, 1995. Samples L--:--:- TIME were ob - c--- N 100. 75- 50- 25, n e . - e .f 25, 0 01 G so, 7 5- 100, 125, PHYSICOCHEMICAL PARAMETERS Water samples were collected hce and bottom with a Van Dorn sampling bottle at each sampling to determine the physico-chemical parameters. Zooplankton samples were obtained with a 48 cm diameter net (125 Vln mesh size) by vertical hauls from close to the bottom to the surface. A total of three samples were collected at eat ing hour to obtain a more representat on zool~lar~kton oo~ulation. I from surl TEMPERATURE I PH I - SALINITY I OXYGEN ch sampl ive data cimens of Lucifer were separated, :ounted and measured individually. ''NecK- (distance between orbit and anterior borde;. of buccal cavity) length has bee11 used in this study to present the size composition of the population of L. faxoni. FIG. 2. Diurnal vnriations in the abundance of ~ucifer faxoni. LT = low tide and HT = high tide. NOTES 105 / / / / / / / / /  3 030 0.40 0.50 0.60 0.70 0.80 0.90 1.00 1.10 N e c k  l e n g t h  i n  m m  FIG. 3. Size frequency composition in percentage of RESULTS Physico-cltemical parameters (Table 1) No discernible daily variation in temperature was observed, at surface or bottom; fluctuation of l.O°C between day and night and between surface and bottom was recorded. Fluctuation in pH value during the day and night was even less significant. The parameter which presented large fluctuation during the day was salinity, normally having higher values at the bottom, with the exception at 09:OO hrs. and 18:OO hrs. when surface value was higher. Salinity 40 ppm. were also observed ng. Dissolved oxygen value did hrge variation during t'-- '--- though hieher values occurred during 1 [Table 1: me aay, !he day ( values a during th I not sho ~f over le sampli~ w any 12 Zooplankton the popula faxoni in I - the sample Ra. 4. Size frequency composition (in percentage) of males and females in the samdes. Diurnal variation in the abundance of (Nair and Sankarankutty, 1988; Sankarankutty, zooplankton confirms the normally expected 1991; Sankarankutty and Medeiros, 1988; pattern, with higher number collected during Sankarankutty et al., 1995 and 1997), Copepoda, the night with a peak value of 4283/m3 at nauplii of Cimipedia, Appendicularia, larvae of 21:OO hrs (Sankarankutty and Medeiros, 1988). Brachyura and Chaetognatha were always well As has been shown in the previous studies represented in the plankton. 1C6 NOTES Lucifer faxoni (Figs. 2-4) largest male measured 1.50 mm and the largest female 1.55 mm "neck" length. Though L. faxoni was present throughout the day, very few of theh occur during the ebb tide (day or night) but their number increased substantially with the flood tide (Fig. 2). It is, therefore, reasonab ~ume that L. faxoni is not a 1 this estuary. The results obtained here on the fluctuation in the number of L. faxoni within the 24 hour cycle is consistent with those presented by Woodmansee (1%6) showing a definite pattern letermined by the state of the tide - 1 transport is achieved by thc tendency I Lucljer to swim up into or remain up in ie water column during a flood tide and to rop out of the water column during an ebbing Llde" (loc. cit.). The material at our disposal is not sufficient enough to determine in detail the biology of the species. However, there is enough evidence to show that mature individuals were well represented in the samples together with smaller and immature individuals in smaller proportion. tle to ass ~t resider rhich is c Landwon c r -. -:r..  lat ti on I a wide ! - t..l~$ faxoni ;e from .A .. 0 was tl 0.11 d ,,,+ t: Th represer majority of them were within the range of 0.61 mm to 1.01 mm "neck" length (Fig. 3). Fig. 4 presents the data (in percentage) of size range of male and female populations collected-majority of males and females were within the size range of 0.81 mm to 1.10 mm; of L. size rang le . popu~ted by ; Departamento de VCCUIWXIUIW e Lirn~wlogia, U~tiversi znde do Nor2 Zrazil C. SANKARANKUITY F.E.N.' idade Fe e, Natal " .  Rio Grr !4-100, 1 ALV- M. B. Rev&. 1 >I., 5 : 371-379. BOWMAN. T E MCCAIN. N.3 mar. Sci. 17 : 660471. HARP@& D .E. Jr. 1%8. Conb. Mar. Sci. 13 : 1-16. HOI B. 1959. Z Leiden No. 44: 2% pp.. LOP 1966. Bid. Inst. Oceanogr. Univ. SZo Paulo 15 NAU w v r r ~ .  1988. Atldntica, Rio Granae lu : 3-ru. )RI. M. 1977. Proc. SCOINIO, 10: 1-12. )I, Natal, 8 : Ld-A77. vr. A. 11. 12 .- AND G. F. MED~IROS 1988. Indian Ocean. Biology of Benthic Marine Organisms. Techniques and metlwd as applied to the Indian Ocean. Oxford & IBH PC o., New Delhi: pp. 331-341. MS. k B. 1965. Fish. Bull., 65 : 1-298. , 1969. Chesapeake Sci., 10 : 3647. Tcology 39 47 : 8474 91. Dep. Oc . AND J. E. 1967. Bull. .M.F CUNHi bras. Zoc A. 1958. 1 966. Ibid., OM( Pub. UNE 

Some observations on lucifer Faxoni borradaile (Crustacea: Decapoda: Sergestidae) collected from a tidal estuary

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Some observations on lucifer Faxoni borradaile (Crustacea: Decapoda: Sergestidae) collected from a tidal estuary

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