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Reproductive seasonality of fishes from a lotic stretch of the Grande River, high Paraná river basin, Brazil
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| Zeitschriftentitel: | Brazilian Journal of Biology |
|---|---|
| Personen und Körperschaften: | , |
| In: | Brazilian Journal of Biology, 65, 2005, 3, S. 387-394 |
| Format: | E-Article |
| Sprache: | Unbestimmt |
| veröffentlicht: |
FapUNIFESP (SciELO)
|
| Schlagwörter: |
| author_facet |
Andrade, P. M. Braga, F. M. S. Andrade, P. M. Braga, F. M. S. |
|---|---|
| author |
Andrade, P. M. Braga, F. M. S. |
| spellingShingle |
Andrade, P. M. Braga, F. M. S. Brazilian Journal of Biology Reproductive seasonality of fishes from a lotic stretch of the Grande River, high Paraná river basin, Brazil General Agricultural and Biological Sciences |
| author_sort |
andrade, p. m. |
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Andrade, P. M. Braga, F. M. S. 1519-6984 FapUNIFESP (SciELO) General Agricultural and Biological Sciences http://dx.doi.org/10.1590/s1519-69842005000300003 <jats:p>We searched for correlations between water level, rainfall, temperature, and reproductive activity of fishes in a lotic stretch of the Grande River below the Volta Grande Dam. Gillnets were used to catch the fish on six field journeys made bimonthly between April 1998 and February 1999. Fish gonads were classified according to maturation grade and the amount of mature or spent gonads was correlated with rainfall and air temperature. Most fish species showed seasonal reproduction (between October and February). The relative frequency of fully mature and spent gonads significantly correlated with rainfall (Spearman r = 0.94, p = 0.005) and air temperature (r = 0.84, p = 0.036), showing the importance of these factors in regulating the reproductive cycle of fishes in this location. Nevertheless, dam operation resulted in minimal water level variation that did not significantly correlate with reproductive activity (r = -0.43, p = 0.396).</jats:p> Reproductive seasonality of fishes from a lotic stretch of the Grande River, high Paraná river basin, Brazil Brazilian Journal of Biology |
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Brazilian Journal of Biology |
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| title |
Reproductive seasonality of fishes from a lotic stretch of the Grande River, high Paraná river basin, Brazil |
| title_unstemmed |
Reproductive seasonality of fishes from a lotic stretch of the Grande River, high Paraná river basin, Brazil |
| title_full |
Reproductive seasonality of fishes from a lotic stretch of the Grande River, high Paraná river basin, Brazil |
| title_fullStr |
Reproductive seasonality of fishes from a lotic stretch of the Grande River, high Paraná river basin, Brazil |
| title_full_unstemmed |
Reproductive seasonality of fishes from a lotic stretch of the Grande River, high Paraná river basin, Brazil |
| title_short |
Reproductive seasonality of fishes from a lotic stretch of the Grande River, high Paraná river basin, Brazil |
| title_sort |
reproductive seasonality of fishes from a lotic stretch of the grande river, high paraná river basin, brazil |
| topic |
General Agricultural and Biological Sciences |
| url |
http://dx.doi.org/10.1590/s1519-69842005000300003 |
| publishDate |
2005 |
| physical |
387-394 |
| description |
<jats:p>We searched for correlations between water level, rainfall, temperature, and reproductive activity of fishes in a lotic stretch of the Grande River below the Volta Grande Dam. Gillnets were used to catch the fish on six field journeys made bimonthly between April 1998 and February 1999. Fish gonads were classified according to maturation grade and the amount of mature or spent gonads was correlated with rainfall and air temperature. Most fish species showed seasonal reproduction (between October and February). The relative frequency of fully mature and spent gonads significantly correlated with rainfall (Spearman r = 0.94, p = 0.005) and air temperature (r = 0.84, p = 0.036), showing the importance of these factors in regulating the reproductive cycle of fishes in this location. Nevertheless, dam operation resulted in minimal water level variation that did not significantly correlate with reproductive activity (r = -0.43, p = 0.396).</jats:p> |
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| author | Andrade, P. M., Braga, F. M. S. |
| author_facet | Andrade, P. M., Braga, F. M. S., Andrade, P. M., Braga, F. M. S. |
| author_sort | andrade, p. m. |
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| description | <jats:p>We searched for correlations between water level, rainfall, temperature, and reproductive activity of fishes in a lotic stretch of the Grande River below the Volta Grande Dam. Gillnets were used to catch the fish on six field journeys made bimonthly between April 1998 and February 1999. Fish gonads were classified according to maturation grade and the amount of mature or spent gonads was correlated with rainfall and air temperature. Most fish species showed seasonal reproduction (between October and February). The relative frequency of fully mature and spent gonads significantly correlated with rainfall (Spearman r = 0.94, p = 0.005) and air temperature (r = 0.84, p = 0.036), showing the importance of these factors in regulating the reproductive cycle of fishes in this location. Nevertheless, dam operation resulted in minimal water level variation that did not significantly correlate with reproductive activity (r = -0.43, p = 0.396).</jats:p> |
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| spelling | Andrade, P. M. Braga, F. M. S. 1519-6984 FapUNIFESP (SciELO) General Agricultural and Biological Sciences http://dx.doi.org/10.1590/s1519-69842005000300003 <jats:p>We searched for correlations between water level, rainfall, temperature, and reproductive activity of fishes in a lotic stretch of the Grande River below the Volta Grande Dam. Gillnets were used to catch the fish on six field journeys made bimonthly between April 1998 and February 1999. Fish gonads were classified according to maturation grade and the amount of mature or spent gonads was correlated with rainfall and air temperature. Most fish species showed seasonal reproduction (between October and February). The relative frequency of fully mature and spent gonads significantly correlated with rainfall (Spearman r = 0.94, p = 0.005) and air temperature (r = 0.84, p = 0.036), showing the importance of these factors in regulating the reproductive cycle of fishes in this location. Nevertheless, dam operation resulted in minimal water level variation that did not significantly correlate with reproductive activity (r = -0.43, p = 0.396).</jats:p> Reproductive seasonality of fishes from a lotic stretch of the Grande River, high Paraná river basin, Brazil Brazilian Journal of Biology |
| spellingShingle | Andrade, P. M., Braga, F. M. S., Brazilian Journal of Biology, Reproductive seasonality of fishes from a lotic stretch of the Grande River, high Paraná river basin, Brazil, General Agricultural and Biological Sciences |
| title | Reproductive seasonality of fishes from a lotic stretch of the Grande River, high Paraná river basin, Brazil |
| title_full | Reproductive seasonality of fishes from a lotic stretch of the Grande River, high Paraná river basin, Brazil |
| title_fullStr | Reproductive seasonality of fishes from a lotic stretch of the Grande River, high Paraná river basin, Brazil |
| title_full_unstemmed | Reproductive seasonality of fishes from a lotic stretch of the Grande River, high Paraná river basin, Brazil |
| title_short | Reproductive seasonality of fishes from a lotic stretch of the Grande River, high Paraná river basin, Brazil |
| title_sort | reproductive seasonality of fishes from a lotic stretch of the grande river, high paraná river basin, brazil |
| title_unstemmed | Reproductive seasonality of fishes from a lotic stretch of the Grande River, high Paraná river basin, Brazil |
| topic | General Agricultural and Biological Sciences |
| url | http://dx.doi.org/10.1590/s1519-69842005000300003 |