Cytotaxonomy of similium damnosum complex: January to June 1982

-Ttt / 3.5 DA b VLL,I",tr*? a SUB]ECT MRSONNET IERIOD COI,IERED SIGI'IAfiIRE OF NESPONSIBTE OIFI@R DAM OF SIIEtrSSION CONTENTS I.JEO ONCIIOCERCIASIS @}fiRot PROffiAMMEi:========:==============- -===- : Cltotaxonon{f of Eg-@, conPlex : G.K. Fiasorgbor (Teehnical 0fficer) : Janua,ry to Jtrne z .....o....*t Dla .rrxt-co"oooaoaaoaaaaaaa I 2. ,. 4. 5 I}IIRODUCTION MAIERIATS AI'ID MEIEODS nESULT TABTES (r - v) oBsRvATroivs/commms -cIiloL[,trD@BEirls a aaaaaaaaaaaaaaa t -2- Tkre present Report covers the period. Janua.:ry to Jirne, 1982. Three weeks of ttris time (2 - 25 April) were taken off as leave. [Lre presentation of t]re data in this report d.iffers a littIe from the two previous ones of the year 1!81. Ihe change concerns ttre da,ta for insecticid.e tests both in the West and in the East. Last year (fggf) these results were mjxed up witJ: the other datas in ttre two zones. But the present report puts tJ:em separately - Ref. Tables I1 and fV. More cytological itLentj.fications were carried. out during tltis period. than at argr other -bime since the inception of the Programte in 1974. In all J?0 collections were made and. 7 1641 larvae id.entified - Ref. Sr::marlr Tables 1 - V. The rajority of larrrae collected. from the kograrome area came from the Ivory Coast and were mainly pprlations of resistant S. Eoubrense a,ud. 9. sanctipauli. The S. soubrense population which was reported. on the Black Volta in the Bui area towards the end of laet year (t9th and,Z1rd December) (see June - December 1981 Clto Report by the sa^ne author) spreads as far as to the spstream of Tagadi W the llh/82. [his cyto-species was first recorded in the Bui-area in December, l-974 W Dr. C. Vajime. Since then there seemed. to be no si6u: of it until its resurgence in December, 1981. The E. soubrens,g population is stiIl present in tJre Bui-area up to the time of writing this report. However, it is now mixed up with the sarranna cytospecies - S. danosun ss. and S:- s.irbaro.. Some of the tributaries of tl:e Black folta - Kolodio and. Kohod.i.o also recorded ttre sarranna cytospecies in June. R. l6raba - [here was no identification of .L-gbrenEg from materj.als received from the L6raba between March and June. - fhe rest of the identifications covering ttre same period particularly from April - June was carried. out by Dr. S.E.O. Mered.ith. [hese results would be contained. in a selnrate report to be subnitted. ty her later. - A11 results contained. in this report have alrea(y been commrnicated. to those who sent in naterials for cytological id.entif ications. MAIERIALS AI.ID IffiTHODS - Materials on which this report is based. came r,ainly fron field aannples collected witlrin and. outside the hograme axea. I I NTRO}UCTION NB ? -1- MET'IIO}S Method.s in the preparation of chromosome slid.es and the id.entification of the d.iff'erent cytospecies were those d.escrj.bed. by Drs. Dunbar, C. .y'ajime, Quil16ve6r6 and S. Ileredith RESUITS Results are sulflmarisecr in TabLes I - V. - Table f (f iefa sarnples froin tire West-OCP Area) - Table 2 (Insecticid.e '.[ests carrj-ed. out in the V/est-OCP Area) - Table 1 (fiefa samples frorn the East-OCP Area) - Table 5 (friefd samples frorn the non-treated areas in the East-OCP). II -Tstc La/L?i it.tl 6/tlsz e/t/ee i ::;.iz/aa v laiet *4-,I.A.SIfl I riiHs.+Ht iriitlil ('aurtt: rii i,c,rlui ffT!!ffiS$lGIE ffiIBE '--q'|-FEEEEITIEG-'* unti*tl* *titlr L 4 4 'I t rl I c. 1 t, .+ I! I I t II 1 g b 2 Isc*t nh E*. t+ @l1* aq $i m I a i i to It I ?L dB F"!# *i ,1a,rab*- IIeasa ei ;-rH I s , f I lII j ti +t, c|d{fre - ? I*tokaira 17+J T I l I R,1 !{areis- ilX,*.s6n. 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"",;'t:--zlL,-'<. .*,,.r:i l_.: .t, 'r I l' .) - r'.r' i :l .\-raid.#!€#.r-cL4&-r .$&.k.'e.*e'...ts....:.#.]a-!.t..*J*.,"---..,**--*:,*'**-eM ir t I :-,'-!"1 , i-tl!- t" : ,,i I i. 4' i l i, l I f iL t f I I * J.:i..r 't--i,+''; .;1.i_ jltI , r'. ," ' ,-; ., ,;, 'r' l' ,t -.i-i I *-+rlrrco+* :rl :\ ,til I,-'. -,:'_f" ^;; II T'i'Ei,I) V (conbd.) -43- -ELHHI,1S*, ffi*tr= i'J; lirii,'i' ;j IltOH i{$h*'I{ihAli.,Ii Aftj .A S ( uA S,;,-,;Cf } ri fr: I#d.artfuJir rul.ilontt* f,rrhlc t l , tilI tr?./Li. - i t it-,- J a L714 ilzi:ee ii. 0u16 , t I E . I ! i : t.I , Ii t l.-I t I I +* 3I i I I I i t .t If-*--' I ! i r* { Itt l i h^, .. t I I +tBSr 3a relplr* 59 8t s-d dEi4r 14 tun*..i.* l i -1 ! I i I I 'BI Cbsri-Ecnrg. 42 i I I i a i I t I I i II t IIIiI II i rt I a U'EST OCP TABLE 1 TABIE 2 -M- SUIViMARY 120 collections 105 collections 2Bt9 2l.15 ld.entif ications id.entif ications TOTAL 226 collections 4954 identifications TABIE 1 TABI,E 4 TAsrE 5 22 col)-ections 50 collections 62 collections id.entif ications identifications identifications 429 1118 tt42 TOTAL 144 collections z 2269 identifications GRAND TOTAL )lO collectiorr.s 7541 identifications 0 B $!RVA T I0 i'rs/ qqq E Nlr t Once agai-n all the six members of the S.-d.arnnosum complex G:So',-rano,sun; S.yahensei E, soubrensea S. sanctipauli: S. d.aum.osum s.s.i and S. sirbanum; ) were record-ecl frorn the tr+o zones of the progranme dr.rrj.:rg the period under review. d.aur:.osum s l4ar1y cases of heterozygpus feuales liere record.ed. from the following rivers in the West - Como6, Band.ama Blanc, Bou, L6raba and Loeual6 (Utr-). S. Sirbanum Almost all the rnales froia La.nda-Pozanda (n, Xara) in Togo and Gorges - I{6}eou (n. iq6toorl.) in Niger, do not carry the usua} IS/J inversion. Accord.ing to some Gytota^zonomists, this inversion is sex-related. and its absence frorn these populations looks very strangp. None of the preparations were nad.e permanent since Dr. S. Mered.ith was right on the spot to confi-rm many of these find.ings. N3 fhe report is intend.ed. to be out exactly at the end of June, but because of the hearry arnount of work in tlre Laboratory and. the lmediate need. by Researchers for the results of insecticide tests d.elayed for some fer^r weeks, , it was II -45- ACKNOWIEDGE}'{ENTS l am grateful to Drs. 3. Philippon (Ctrief VCU), ME G. Zerbo (O:ief Entomological Evaluation), Dr. Gruner,,ra1d., (Research Co-ordinator), Dr, C, Ciboho (Onief Entornological Evaluation - Zone East), D=. H. Agoua (Cnief Entomological Erraluation - Zone West), Dr. n. Kurtak, lr. J.Itr. Raybo,-ild, Dr. H. Ja^wrback, Dr. S. Mered,ith, the Chiefs of all the Sectors and S/Sectors, the Staff of tire Aerial Operations, Messrs: I{.H.Ocran, Ba.mo T616, R. Salrado6o and I,Ia.xjrxe 0u6d.rao6o who provided. naterial for this work. In particul-ar I wish to thar:lc l,lr 3ougs6r6 B. Koka, n4r la,boratory Assistant for his tremend.ous progress ia the preparation of the chronogome slides. BNrK/cF. I