3/19/2023 0 Comments Deinterlace lightcaptureCluster analyses showed that closely related species within the families Haemulidae, Lutjanidae and Acanthuridae, and the different size classes within species in most cases had a spatial separation in biotope utilization. For most fish species an (partial) ontogenetic shift was observed at a particular life stage from their ( shallow) nursery biotopes to the (deeper) coral reef. The almost complete absence of juveniles on the deeper reef zones indicates the high dependence of juveniles on the shallow water biotopes as a nursery. Although fishes showed a clear preference for a specific nursery biotope, most fish species utilized multiple nursery biotopes simultaneously. carbonarium and Anisotremus surinamensis were not observed in any of the six biotopes. Juvenile Acanthurus coeruleus utilized all six biotopes, while juvenile H. griseus, Sphyraena barracuda and Chaetodon capistratus, and the shallow coral reef for juvenile H. sciurus, Ocyurus chrysurus, Acanthurus chirurgus and Sparisoma viride, the mangroves for juvenile Lutjanus apodus, L. Mutual comparison between biotopes showed that the seagrass beds were the most important nursery biotope for juvenile Haemulon flavolineatum, H. The mangroves, seagrass beds and shallow coral reef (0 to 3 m) appeared to be the main nursery biotopes for the juveniles of the selected species. Length and abundance of 16 commercially important reef fish species were determined by means of visual censuses during the day in six different biotopes: mangrove prop-roots ( Rhizophora mangle) and seagrass beds ( Thalassia testudinum) in Lac Bay, and four depth zones on the coral reef (0 to 3 m, 3 to 5 m, 10 to 15 m and 15 to 20 m). The nursery function of various biotopes for coral reef fishes was investigated on Bonaire, Netherlands Antilles. Importance of Mangroves, Seagrass Beds and the Shallow Coral Reef as a Nursery for Important Coral Reef Fishes, Using a Visual Census Technique Due to the low abundance of structurally complex seagrass beds we suggest that seaweed beds might influence adult reef fish abundances, being essential for several keystone species of reef fish in the tropical south-western Atlantic. Sargassum-dominated beds might be more important as nurseries for a larger number of fish species than seagrass beds. Connectivity, and thus pathways of nutrient transfer, seems to function differently in east Brazil compared to many tropical regions. Coral cover was not correlated to adult fish distribution patterns instead, type of turf was an important variable. the Caribbean) utilise seagrass beds as nursery habitats were here instead observed in Sargassum beds or back reef habitats. Species that in other regions worldwide (e.g. Seagrass beds contained lower abundances and species richness of fish than expected, while Sargassum-dominated seaweed beds contained significantly more juveniles than all other habitats (average juvenile fish densities: 32.6 per 40 m2 in Sargassum beds, 11.2 per 40 m2 in back reef, 10.1 per 40 m2 in fore reef, and 5.04 per 40 m2 in seagrass beds), including several species that are found in the reef habitats as adults. Fish were surveyed in fore reef, back reef, Halodule wrightii seagrass beds and seaweed beds. Here, we investigated if reef fish assemblages in the tropical south-western Atlantic demonstrate ontogenetic habitat connectivity and identify possible nurseries on three reef systems along the eastern Brazilian coast. Seagrass beds and mangroves often constitute important nursery habitats, with high structural complexity and protection from predation. A number of reef fish species use separate adult and nursery habitats, and hence contribute to nutrient and energy transfer between habitats. Seascape connectivity is regarded essential for healthy reef fish communities in tropical shallow systems. Seaweed beds support more juvenile reef fish than seagrass beds in a south-western Atlantic tropical seascapeĮggertsen, L.
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