Seasonal abundance and depth distribution of Blennius fluviatilis and introduced Lepomis gibbosus, in Lake Banyoles (Catalonia, Spain) |
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Authors: | A Vila-Gispert R Moreno-Amich |
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Institution: | (1) Institute of Aquatic Ecology and Department of Environmental Sciences, University of Girona, 17071 Girona, Spain |
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Abstract: | Temporal and spatial occurrence of limnetic larval fish in Lake Banyoles in the spring and summer of 1993 and 1994 indicated
that pumpkinseed spawned over 15 weeks (from mid-May to mid-August) and freshwater blenny over 14 weeks (from mid-May until
early August). We noted that the spawning period of pumpkinseed commenced earlier in Lake Banyoles than in more northern lakes.
Pumpkinseed and freshwater blenny larvae were collected by tow net in both the limnetic (at 4–4.5 m) and littoral zones (at
0–0.5 m), during daylight (no samples were taken during night). Freshwater blenny larvae were more abundant than pumpkinseed
larvae. Both of them were more abundant in 1993 than in 1994 (pumpkinseed: 1.61 ind. 100 m−3 vs. 0.70 ind. 100 m−3; freshwater
blenny: 3.95 ind. 100 m−3 vs. 1.90 ind. 100 m−3) and in both years they were uniformly distributed in the lake, without differences
between the areas considered. The pumpkinseed larvae migrated at 3.5 mm TL into the limnetic zone, and returned to the vegetation
of the littoral zone as juveniles. The freshwater blenny larvae were also planktonic (3.5–14 mm TL) but were distributed in
both the littoral and limnetic zone before benthic settlement. The larval distribution is discussed on the basis of a trade-off
between foraging and predation risk.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | larval habitat foraging and predation risk spawning season hatch period |
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