Prey selection by two benthic fish species in a Mato Grosso stream, Rio de Janeiro, Brazil
Key to understand predator choice is the relationship between predator and prey abundance. There are few studies related to prey selection and availability. Such an approach is still current, because the ability to predict aspects of the diet in response to changes in prey availability is one of the...
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| Format: | Article |
| Language: | English |
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Vicerractoría Investigación
2011-12-01
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| Series: | Revista de Biología Tropical |
| Subjects: | |
| Online Access: | http://www.scielo.sa.cr/scielo.php?script=sci_arttext&pid=S0034-77442011000400023&lng=en&tlng=en |
| _version_ | 1797709295825977344 |
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| author | Carla Ferreira Rezende Rosana Mazzoni Érica Pellegrini Caramaschi Daniela Rodrigues Maíra Moraes |
| author_facet | Carla Ferreira Rezende Rosana Mazzoni Érica Pellegrini Caramaschi Daniela Rodrigues Maíra Moraes |
| author_sort | Carla Ferreira Rezende |
| collection | DOAJ |
| description | Key to understand predator choice is the relationship between predator and prey abundance. There are few studies related to prey selection and availability. Such an approach is still current, because the ability to predict aspects of the diet in response to changes in prey availability is one of the major problems of trophic ecology. The general objective of this study was to evaluate prey selection by two species (Characidium cf. vidali and Pimelodella lateristriga) of the Mato Grosso stream, in Saquarema, Rio de Janeiro, Brazil. Benthos and fishes were collected in June, July and September of 2006 and January and February of 2007. Fish were collected with electric fishing techniques and benthos with a surber net. Densities of benthic organisms were expressed as the number of individuals per/m2. After sampling, the invertebrates were fixed in 90% ethanol, and, in the laboratory, were identified to the lowest taxonomical level. Approximately, seventy individuals from each species were selected randomly in each month. Fishes were fixed in 10% formalin in the field and transferred to 70o GL ethanol in the laboratory. Fishes had their stomachs removed for subsequent analysis. Fish diet was described according to the numeric frequency method. The Manly Electivity I ndex was applied in order to verify prey selection. The most abundant families in both benthos and diet of both fish species were the same, indicating that these species consume mainly most abundant prey in the environment. We concluded that prey selection occurs even for preys that had small abundance in the environment . However, it is the availability of the macroinvertebrate resources that determines the major composition of items in diet of fish, demonstrating that the abundance is the factor that most influences the choice of prey. Rev. Biol. Trop. 59 (4): 1697-1706. Epub 2011 December 01. |
| first_indexed | 2024-03-12T06:35:24Z |
| format | Article |
| id | doaj.art-bf85523484bb4787937394462ecc745d |
| institution | Directory Open Access Journal |
| issn | 0034-7744 |
| language | English |
| last_indexed | 2024-03-12T06:35:24Z |
| publishDate | 2011-12-01 |
| publisher | Vicerractoría Investigación |
| record_format | Article |
| series | Revista de Biología Tropical |
| spelling | doaj.art-bf85523484bb4787937394462ecc745d2023-09-03T01:22:08ZengVicerractoría InvestigaciónRevista de Biología Tropical0034-77442011-12-0159416971706S0034-77442011000400023Prey selection by two benthic fish species in a Mato Grosso stream, Rio de Janeiro, BrazilCarla Ferreira Rezende0Rosana Mazzoni1Érica Pellegrini Caramaschi2Daniela Rodrigues3Maíra Moraes4Universidade Federal do Rio de JaneiroUniversidade do Estado do Rio de JaneiroUniversidade Federal do Rio de JaneiroUniversidade Federal do Rio de JaneiroUniversidade do Estado do Rio de JaneiroKey to understand predator choice is the relationship between predator and prey abundance. There are few studies related to prey selection and availability. Such an approach is still current, because the ability to predict aspects of the diet in response to changes in prey availability is one of the major problems of trophic ecology. The general objective of this study was to evaluate prey selection by two species (Characidium cf. vidali and Pimelodella lateristriga) of the Mato Grosso stream, in Saquarema, Rio de Janeiro, Brazil. Benthos and fishes were collected in June, July and September of 2006 and January and February of 2007. Fish were collected with electric fishing techniques and benthos with a surber net. Densities of benthic organisms were expressed as the number of individuals per/m2. After sampling, the invertebrates were fixed in 90% ethanol, and, in the laboratory, were identified to the lowest taxonomical level. Approximately, seventy individuals from each species were selected randomly in each month. Fishes were fixed in 10% formalin in the field and transferred to 70o GL ethanol in the laboratory. Fishes had their stomachs removed for subsequent analysis. Fish diet was described according to the numeric frequency method. The Manly Electivity I ndex was applied in order to verify prey selection. The most abundant families in both benthos and diet of both fish species were the same, indicating that these species consume mainly most abundant prey in the environment. We concluded that prey selection occurs even for preys that had small abundance in the environment . However, it is the availability of the macroinvertebrate resources that determines the major composition of items in diet of fish, demonstrating that the abundance is the factor that most influences the choice of prey. Rev. Biol. Trop. 59 (4): 1697-1706. Epub 2011 December 01.http://www.scielo.sa.cr/scielo.php?script=sci_arttext&pid=S0034-77442011000400023&lng=en&tlng=enelectivitytrophic ecologyneotropicalstream fish |
| spellingShingle | Carla Ferreira Rezende Rosana Mazzoni Érica Pellegrini Caramaschi Daniela Rodrigues Maíra Moraes Prey selection by two benthic fish species in a Mato Grosso stream, Rio de Janeiro, Brazil Revista de Biología Tropical electivity trophic ecology neotropical stream fish |
| title | Prey selection by two benthic fish species in a Mato Grosso stream, Rio de Janeiro, Brazil |
| title_full | Prey selection by two benthic fish species in a Mato Grosso stream, Rio de Janeiro, Brazil |
| title_fullStr | Prey selection by two benthic fish species in a Mato Grosso stream, Rio de Janeiro, Brazil |
| title_full_unstemmed | Prey selection by two benthic fish species in a Mato Grosso stream, Rio de Janeiro, Brazil |
| title_short | Prey selection by two benthic fish species in a Mato Grosso stream, Rio de Janeiro, Brazil |
| title_sort | prey selection by two benthic fish species in a mato grosso stream rio de janeiro brazil |
| topic | electivity trophic ecology neotropical stream fish |
| url | http://www.scielo.sa.cr/scielo.php?script=sci_arttext&pid=S0034-77442011000400023&lng=en&tlng=en |
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