Diel variation of larval fish abundance in the Amazon and Rio Negro
Many streams and large rivers present higher ichthyoplankton densities at night. However, in some rivers this does not occur and larvae are equally abundant during the day. Larval drift diel variation is an important information for planning sampling programs for evaluating larval distribution and p...
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| Format: | Article |
| Language: | English |
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Instituto Internacional de Ecologia
2001-01-01
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| Series: | Brazilian Journal of Biology |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842001000300003 |
| _version_ | 1819132190641881088 |
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| author | ARAUJO-LIMA C. A. R. M. SILVA V. V. da PETRY P. OLIVEIRA E. C. MOURA S. M. L. |
| author_facet | ARAUJO-LIMA C. A. R. M. SILVA V. V. da PETRY P. OLIVEIRA E. C. MOURA S. M. L. |
| author_sort | ARAUJO-LIMA C. A. R. M. |
| collection | DOAJ |
| description | Many streams and large rivers present higher ichthyoplankton densities at night. However, in some rivers this does not occur and larvae are equally abundant during the day. Larval drift diel variation is an important information for planning sampling programs for evaluating larval distribution and production. The aim of this study was to test whether the abundance of larval fish was different at either period. We tested it by comparing day and night densities of characiform, clupeiform and siluriform larvae during five years in the Amazon and one year in Rio Negro. We found that larvae of three species of characiform and larvae of siluriform were equally abundant during day and night in the Amazon. Conversely, the catch of Pellona spp. larvae was significantly higher during the day. In Rio Negro, however, larval abundance was higher during the night. These results imply that day samplings estimate adequately the abundance of these characiform and siluriform larvae in the Amazon, but not Pellona larvae. Evaluations of larved densities of Rio Negro will have to consider night sampling. |
| first_indexed | 2024-12-22T09:27:28Z |
| format | Article |
| id | doaj.art-516b3097176e4921952a27778456d2e6 |
| institution | Directory Open Access Journal |
| issn | 1519-6984 1678-4375 |
| language | English |
| last_indexed | 2024-12-22T09:27:28Z |
| publishDate | 2001-01-01 |
| publisher | Instituto Internacional de Ecologia |
| record_format | Article |
| series | Brazilian Journal of Biology |
| spelling | doaj.art-516b3097176e4921952a27778456d2e62022-12-21T18:31:02ZengInstituto Internacional de EcologiaBrazilian Journal of Biology1519-69841678-43752001-01-01613357362Diel variation of larval fish abundance in the Amazon and Rio NegroARAUJO-LIMA C. A. R. M.SILVA V. V. daPETRY P.OLIVEIRA E. C.MOURA S. M. L.Many streams and large rivers present higher ichthyoplankton densities at night. However, in some rivers this does not occur and larvae are equally abundant during the day. Larval drift diel variation is an important information for planning sampling programs for evaluating larval distribution and production. The aim of this study was to test whether the abundance of larval fish was different at either period. We tested it by comparing day and night densities of characiform, clupeiform and siluriform larvae during five years in the Amazon and one year in Rio Negro. We found that larvae of three species of characiform and larvae of siluriform were equally abundant during day and night in the Amazon. Conversely, the catch of Pellona spp. larvae was significantly higher during the day. In Rio Negro, however, larval abundance was higher during the night. These results imply that day samplings estimate adequately the abundance of these characiform and siluriform larvae in the Amazon, but not Pellona larvae. Evaluations of larved densities of Rio Negro will have to consider night sampling.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842001000300003Amazonfishlarvaeriverdiel distribution |
| spellingShingle | ARAUJO-LIMA C. A. R. M. SILVA V. V. da PETRY P. OLIVEIRA E. C. MOURA S. M. L. Diel variation of larval fish abundance in the Amazon and Rio Negro Brazilian Journal of Biology Amazon fish larvae river diel distribution |
| title | Diel variation of larval fish abundance in the Amazon and Rio Negro |
| title_full | Diel variation of larval fish abundance in the Amazon and Rio Negro |
| title_fullStr | Diel variation of larval fish abundance in the Amazon and Rio Negro |
| title_full_unstemmed | Diel variation of larval fish abundance in the Amazon and Rio Negro |
| title_short | Diel variation of larval fish abundance in the Amazon and Rio Negro |
| title_sort | diel variation of larval fish abundance in the amazon and rio negro |
| topic | Amazon fish larvae river diel distribution |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842001000300003 |
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