Abstract
Relative abundance and diet of Grundulus bogotensis (Characiformes: Characidae) in the Cundiboyacense plateau, Colombia. Abstract. To compare the relative abundance of Grundulus bogotensis in two river basins and the diet of the populations of three basins in the Cundiboyacense plateau, we sampled 10 localities using electrofishing equipment between March and June 2006. The relative abundance in each locality was expressed as the number of fish caught per hour on a 100m stretch; any significant differences in relative abundance among basins were identified via a Kruskal-Wallis test. To quantify the diet, we used the volumetric method. Similarities between the basins were determined using three multivariate analyzes: nonmetric multidimensional scaling, analysis of similarity and similarity percentages. In the end, we collected a total of 675 individuals during 600 minutes of capture effort. The abundance of this species in the Bogota river basin was significantly lower compared to that of the Suarez basin. The dietary composition, of autochthonous origin, primarily immature insects and microcrustaceans and the volume of items proved similar between the basins. In conclusion, the dietary analysis indicated a similarity exceeding 60% in the feed resource use for the three basins. The relative abundance of populations of G. bogotensis in the Bogota river basin was lower than in the Suarez river basin, the latter having, possibly, the greatest abundance of this species throughout its range. The data suggests the most favorable conditions for the survival of the species in Lake Tota.
Highlights
Relative abundance and diet of Grundulus bogotensis (Characiformes: Characidae) in the Cundiboyacense plateau, Colombia
Tradicionalmente se asume que la pérdida de especies está acompañada por un cambio en la distribución de las abundancias desde una serie log normal para una geométrica (Magurran y Phillip 2001)
Ítems que fueron consumidos por G. bogotensis, como anfípodos, Chironomidae, odonatos y otras larvas de insectos, son abundantes en los tallos y raíces de macrófitas sumergidas (Rozas y Odum 1988)
Summary
Relative abundance and diet of Grundulus bogotensis (Characiformes: Characidae) in the Cundiboyacense plateau, Colombia. Se comparó la abundancia relativa de Grundulus bogotensis entre dos cuencas y la dieta entre poblaciones de tres cuencas del DOWLSODQR&XQGLER\DFHQVH(QWUHPDU]R\MXQLRGHVHUHDOL]DURQ PXHVWUHRVHQORFDOLGDGHVXWLOL]DQGRXQHTXLSRGHHOHFWURSHVFD/D DEXQGDQFLDUHODWLYDGHFDGDORFDOLGDGVHH[SUHVyFRPRHOQ~PHURGH LQGLYLGXRV FDSWXUDGR SRU KRUD HQ XQ WUDPR GH P 6H XWLOL]y XQ WHVWGH.UXVNDO:DOOLVSDUDGHWHUPLQDUGLIHUHQFLDVVLJQLÀFDWLYDVHQOD DEXQGDQFLD UHODWLYD HQWUH FXHQFDV 3DUD FXDQWLÀFDU OD GLHWD VH XWLOL]y el método volumétrico y para determinar el grado de similaridad entre cuencas se recurrió a tres análisis multivariados: análisis de HVFDORQDPLHQWR PXOWLGLPHQVLRQDO QR PpWULFR 10'6 DQiOLVLV GH VLPLODULGDG $126,0 \ DQiOLVLV GH SRUFHQWDMH GH VLPLODULGDG 6,03(5 6H FDSWXUDURQ HQ WRWDO LQGLYLGXRV HPSOHDQGR PLQXWRV GH HVIXHU]R GH FDSWXUD /D DEXQGDQFLD GH OD HVSHFLH HQ OD FXHQFD GHO UtR %RJRWi IXH VLJQLÀFDWLYDPHQWH PHQRU UHVSHFWR D OD GHOUtR6XiUH]/DFRPSRVLFLyQGHODGLHWD\YROXPHQGHtWHPVHQWUH FXHQFDVIXHVLPLODU(OPDWHULDOFRQVXPLGRIXHGHRULJHQDXWyFWRQR \ ORV tWHPV PiV LPSRUWDQWHV IXHURQ ORV LQVHFWRV LQPDGXURV \ ORV PLFURFUXVWiFHRV /D DEXQGDQFLD UHODWLYD GH ODV SREODFLRQHV GH G. Comparar a abundância relativa de Grundulus bogotensis HQWUHGXDVEDFLDVHDGLHWDHQWUHSRSXODo}HVGHWUrVEDFLDVGRSODQDOWR &XQGLER\DFHQVH (QWUH PDUoR H MXQKR GH IRUDP UHDOL]DGDV FROHWDVHPORFDOLGDGHVXWLOL]DQGRHTXLSDPHQWRGHSHVFDHOpWULFD$ DEXQGkQFLDUHODWLYDGDHVSpFLHHPFDGDORFDOLGDGHIRLH[SUHVVDFRPR RQ~PHURGHLQGLYtGXRVFDSWXUDGRVSRUKRUDHPXPWUHFKRGHP GHH[WHQVmR)RLXWLOL]DGRRWHVWHGH.UXVNDO:DOOLVSDUDGHWHUPLQDU GLIHUHQoDV VLJQLÀFDWLYDV QD DEXQGkQFLD UHODWLYD HQWUH DV EDFLDV 3DUD TXDQWLÀFDU D GLHWD IRL XWLOL]DGR R PpWRGR YROXPpWULFR H SDUD GHWHUPLQDU R JUDX GH VLPLODULGDGH HQWUH EDFLDV IRUDP XWLOL]DGDV WUrV análises multivariadas: análise de escalonamento multidimensional QmRPpWULFR 10'6 DQiOLVHGHVLPLODULGDGH $126,0 HDQiOLVHGH SRUFHQWDJHPGHVLPLODULGDGH 6,03(5 1RWRWDOIRUDPFDSWXUDGRV LQGLYtGXRV HPSUHJDQGR PLQXWRV GH HVIRUoR GH FDSWXUD $ DEXQGkQFLDGHVWDHVSpFLHQDEDFLDGRULR%RJRWiIRLVLJQLÀFDWLYDPHQWH PHQRUTXHQDEDFLDGRULR6XiUH]$FRPSRVLomRGDGLHWDHYROXPH GRV LWHQV GH DOLPHQWR HQWUH EDFLDV IRUDP VLPLODUHV 2V UHFXUVRV consumidos foram de origem autóctone e os itens mais abundantes IRUDPLQVHWRVLPDWXURVHPLFURFUXVWiFHRV$DEXQGkQFLDUHODWLYDGDV SRSXODo}HVGHG bogotensis na bacia do rio Bogotá foi menor do que QDEDFLDGRULR6XiUH]$EDFLDGRULR6XiUH]SURYDYHOPHQWHVXSRUWDD PDLRUDEXQGkQFLDGDHVSpFLHHPWRGDDiUHDGHGLVWULEXLomRHRVGDGRV VXJHUHPFRQGLo}HVIDYRUiYHLVSDUDDVREUHYLYrQFLDGD*XDSXFKDQR /DJR GH 7RWD $ DQiOLVH GD GLHWD LQGLFRX XPD VLPLODULGDGH PDLRU D QDXWLOL]DomRGRUHFXUVRDOLPHQWDUQDVWUrVEDFLDV
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