We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Biologia populacional de lmparfinis minutus (Siluriformes, Heptapteridae) na microbacia do Ribeirao Grande, serra da Mantiqueira oriental, Estado de Sao Paulo.
- Authors
de Moraes, Mariana Bissoli; de Souza Braga, Francisco Manoel
- Abstract
Populational biology of Irnparfinis rnin11t1ts (Silurifonnes, Heptapteridae) in the Ribeirao Grande microbasin, eastern Mantiqueira mountain range, Sao Paulo State. The aim of the work was to analyze biological aspects and distribution of Imparji11is minutus in the Ribeirao Grande microbasin (22°47'08 "S, 45"28'17"W), in eastern Mantiqueira mountain range, from July 2001 to April 2002. Among the 37 species sampled, I. mi11utus (Siluriformes, I Ieptapteridae), was distributed from the piedmont to the plains of the Vale do Parafba. The occurrence of this species was associated with the environments of small water volume, bottom with stones and gravel. The amplitude length of I. mi11utus was 4.75 to 12.75 em. The length-weight relationship of the population was estimated at W = 0.0052 L3,13. Analyzing the alometric (Ka) and relative (Kr) condition factors, both indexes presented similar values. The lowest value was obtained in July, increasing gradually in October and January, and peaking in April. The analysis of the gonadossomatic relationship (GSR) of females showed higher values in July and January. The reproductive period of I. mitwtus occurred on spring'summer (October to January), as suggested by the gonadossomatic relationship and condition factor results. Feeding activity was constant, with fat visceral deposition concentrated in April and July. Imparfittis minutus is an aquatic insectivore opportunist species, consuming Diptera and Trichoptera larvae as secondary items. Most ingested food items were autochthonous resources.
- Subjects
MANTIQUEIRA Mountain Range (Brazil); BRAZIL; CATFISHES; FISH feeds; CADDISFLIES; DIPTERAN larvae; AQUATIC insects
- Publication
Acta Scientiarum: Biological Sciences, 2011, Vol 33, Issue 3, p301
- ISSN
1679-9283
- Publication type
Article
- DOI
10.4025/actascibiolsci.v33i3.6591