of large species have resource requirements similar to
those of adults of smaller species. Such competition
may result in a significant bottleneck to recruitment to
the adult stages of larger species.
Size specific shifts in food or habitat type have
been documented in many species. For Hydrocynus
forskalii in the Chari River (Lauzanne, 1975), juveniles
up to 300 mm are almost strictly zooplanktophages.
Between 30 and 45 mm they eat both zooplankton and
insects. Above 50 mm length, they become strictly
piscivorous (Jig. 2A). In the Lake Chad eastern
archipelago, a similar but less clear pattern has been
observed, shrimps being another important food item
in the diet of H. furskalii ($g. 2B):
Diet also changes with individual growth in
cichlids. A peculiar behavioural and morphological
development has been reported for Ducimodus
eveZynae a cichlid species from Lake Malawi (Ribbink,
1984, 1990), in which small juveniles (less than
50 mm SL) are facultative cleaners, removing fungi
of large species have resource requirements similar tothose of adults of smaller species. Such competitionmay result in a significant bottleneck to recruitment tothe adult stages of larger species.Size specific shifts in food or habitat type havebeen documented in many species. For Hydrocynusforskalii in the Chari River (Lauzanne, 1975), juvenilesup to 300 mm are almost strictly zooplanktophages.Between 30 and 45 mm they eat both zooplankton andinsects. Above 50 mm length, they become strictlypiscivorous (Jig. 2A). In the Lake Chad easternarchipelago, a similar but less clear pattern has beenobserved, shrimps being another important food itemin the diet of H. furskalii ($g. 2B):Diet also changes with individual growth incichlids. A peculiar behavioural and morphologicaldevelopment has been reported for DucimoduseveZynae a cichlid species from Lake Malawi (Ribbink,1984, 1990), in which small juveniles (less than50 mm SL) are facultative cleaners, removing fungi
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