Régimen alimentario de siete especies ícticas en el embalse de la hidroeléctrica Urrá (Córdoba, Colombia)

Atencio-García, Víctor; Kerguelén-Durango, Eduardo; Dorado, E. Cura; Cárcamo, Robinson Rosado; Vallejo, Adriana; Valderrama, María Jimena

doi:10.21897/rmvz.465

Cited by 5 publications

(2 citation statements)

References 1 publication

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“…Por el contrario, en SA, el 80% de las estimaciones resultaron mayores al 50% de sobreposición, lo que indicaría la existencia de dietas más amplias. Esto muestra que hay un gradiente de sobreposición como el reportado para otros ambientes (DeSilva & Kortmulder 1977, DeSilva et al 1980, Atencio-García et al 2005, Alford & Beckett 2007. Pouilly et al (2006) encontraron, en la cuenca alta del río Beni (Bolivia), que en aguas bajas los peces consumieron los recursos autóctonos del ambiente (invertebrados), con un bajo consumo de recursos alóctonos (invertebrados terrestres, frutos y semillas).…”

Section: Discussionunclassified

Variación espacial y temporal en la composición de la dieta de peces invertívoros en un río neotropical, Venezuela

Ortaz¹,

Martín²,

López-Ordaz³

2010

RBT

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Spatial and temporal variation in diet composition of invertivore fishes in a tropical stream, Venezuela. Invertivores fishes are an important component of neotropical streams and they represent a link between aquatic invertebrates and piscivorous species. This study evaluated the breadth diet and interspecific food overlap of nine invertivores fish species during three consecutive hydrological phases: falling (December/07, January/08, February/08 and March/08), low (April/08) and rising waters (June/08), in two sections of a Venezuelan neotropical stream, which were located at different elevation, high watershed (HW) and low watershed (LW). The fishes were collected with a beach seine (5mm mesh) between 8:00 and 11:00 hours. The diet of each species was evaluated using an index of relative importance (IRI), which includes as variables the number, weight and occurrence frequency of food items consumed. The Levin' index (B i) and Morisita (IM) were used to estimate the breadth diet and interspecific food overlap, respectively. All estimations were made using the numeric proportion of preys. Nine fish species were captured, eight Characiformes, of which three were captured in HW (Knodus deuteronoides, Creagrutus bolivari and C. melasma) and five in LW (Thoracocharax stellatus, Moenkhausia lepidura, Cheirodon pulcher, Ctenobrycon spilurus and Aphyocharax alburnus), and one Cyprinodontiformes (Poecilia reticulata), which was also found in HW. In HW aquatic insects were the main resource consumed by fishes while plant material and terrestrial arthropods were secondary resources. In LW the fishes ingested all of these items in addition to zooplankton (Copepoda, Cladocera and larval stages of Decapoda). However, there was a temporal replacement with a predominance of zooplankton in falling and low water. In general, the breadth diet decreased during the falling water in both sections and increased in rising water. However, the average breadth diet was higher in HW. The interspecific food overlap was high in HW while low values were more frequent in LW and its temporal variation was opposed in both sections during almost all the sampling period.

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Section: Discussionunclassified

Variación espacial y temporal en la composición de la dieta de peces invertívoros en un río neotropical, Venezuela

Ortaz¹,

Martín²,

López-Ordaz³

2010

RBT

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“…comm.). Atencio-García et al (2005) recorded fishes and macrocrustaceans in the diet of A. pardalis. Tobías-Arias et al (2006) observed that A. pardalis feeds mainly on fishes, crustaceans and insects, in addition to other items identified by the authors as plant remains and unidentified material.…”

Section: Ecological Notesmentioning

confidence: 99%

Taxonomic revision of the South American catfish genus Ageneiosus (Siluriformes: Auchenipteridae) with the description of four new species

Ribeiro

Py‐Daniel

Walsh

2017

Journal of Fish Biology

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The catfish genus Ageneiosus in the exclusively Neotropical family Auchenipteridae is revised. Species of Ageneiosus are widely distributed in all major South American continental drainages except the São Francisco River basin and small rivers along the Brazilian east coast. The taxonomic revision was based on examination of available type specimens, additional museum material and comparisons of original descriptions. A suite of morphometric, meristic and qualitative characters of internal and external anatomy were used to diagnose valid species and determine synonyms. Thirteen valid species are recognized in the genus Ageneiosus, some of which are widely distributed across South America. Ageneiosus pardalis is the only trans-Andean species in the genus. Ageneiosus polystictus and Ageneiosus uranophthalmus are more widely distributed than previously reported. Ageneiosus marmoratus is a junior synonym of Ageneiosus inermis. Ageneiosus dentatus is a valid species and its name is removed from the synonymy of Ageneiosus ucayalensis. Four new species are described: Ageneiosus akamai, Ageneiosus apiaka, Ageneiosus intrusus and Ageneiosus lineatus, all from the Amazon River basin. A dichotomous key for all 13 valid species of Ageneiosus species is provided.

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Biomagnification of Mercury in Fish from Two Gold Mining-Impacted Tropical Marshes in Northern Colombia

Marrugo‐Negrete

Ruíz-Guzmán

Ruiz-Fernández

2017

Arch Environ Contam Toxicol

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Total mercury concentrations (T-Hg) and stable isotope ratios (δN and δC) were analyzed in the muscle of fish, collected at two marshes impacted by gold mining in Northern Colombia, to evaluate the seasonal and spatial behavior of these variables and mercury biomagnification based on their relationship with δN ratios in the fish. There was not significant (p > 0.05) seasonal differences (dry and rainy season) in δN and δC values in none marsh, suggesting that these fish species keep a similar feed pattern within each marsh along the year. However, there were significant differences (p < 0.05) between marshes in δN, δC, and T-Hg, as well as significant seasonal differences (p < 0.05) in T-Hg values for some species, suggesting the possible influence of factors, such as differences in length of food chains between marshes and different degree of anthropogenic impact in relation to human settlements, farmland, livestock (higher in Ayapel marsh), and gold mining activity (higher in La Raya marsh). Correlations analysis showed significant (p < 0.05) relationships between T-Hg concentrations and δN values, as well as trophic level, evidencing a T-Hg biomagnification process in the fish food chain from both marshes and consequently a potential health risk for human riverside inhabitants who eat these fish.

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Régimen alimentario de siete especies ícticas en el embalse de la hidroeléctrica Urrá (Córdoba, Colombia)

Cited by 5 publications

References 1 publication

Variación espacial y temporal en la composición de la dieta de peces invertívoros en un río neotropical, Venezuela

Variación espacial y temporal en la composición de la dieta de peces invertívoros en un río neotropical, Venezuela

Taxonomic revision of the South American catfish genus Ageneiosus (Siluriformes: Auchenipteridae) with the description of four new species

Biomagnification of Mercury in Fish from Two Gold Mining-Impacted Tropical Marshes in Northern Colombia

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