Datos de ocurrencia y tróficos de los depredadores del Río Paraná

Name: Datos de ocurrencia y tróficos de los depredadores del Río Paraná
License: https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Keywords: Peces

Datos de investigación

Datos de ocurrencia y tróficos de los depredadores del Río Paraná

Autores: Borzone Mas, Dalmiro Icon

; Scarabotti, Pablo Augusto Icon

Publicador: Consejo Nacional de Investigaciones Científicas y Técnicas

Fecha de depósito: 30/06/2022

Fecha de creación: 20/03/2009-04/01/2020

Clasificación temática:

Ecología

Resumen

Datos utilizados para el trabajo Symmetries and asymmetries in the topological roles of piscivorous fishes between occurrence networks and food webs , publicado en el Journal of animal ecology. En esta base de datos observamos las ocurrencias y las interacciones tróficas de 16 piscívoros del Río Paraná medio. Para la mayoría de las observaciones se presentan la fecha de captura, la especie, longitud estandar y peso total.

Métodos

Fishes were sampled from 27 water bodies (Figure 1) grouped in four habitat types according to their flow, size and connectivity: major rivers, secondary channels, connected lakes and isolated lakes. The major rivers consisted of lotic environments that had an average width between 330 and 1100 m. The secondary channels had an average channel width between 28 and 137 m, and meandered among the floodplain islands. The connected lakes were lentic environments that had a permanent connection with the smaller and larger channels and had a surface area between 3.4 and 240 ha and a depth between 0.7 and 3.1 m at average water level. The isolated lakes consisted of lentic environments whose connection with the channels was interrupted throughout the hydrological period and presented areas between 4.1 and 40.1 ha. Given that ecological communities of the Paraná River floodplain vary at multiple spatial and temporal scales, it is logistically impossible to catch the whole variation in species occurrences and trophic interactions in a single sampling design. For this reason, we used two different but complementary sampling designs, one focusing on the spatial variation and another one focusing on temporal variation. In the first sampling design, we surveyed 27 different water bodies in four different occasions with an annual frequency during the years 2013, 2014, 2015 and 2016. The four spatial sampling events were timed to cover the four different hydroclimatic conditions. In the second sampling design we surveyed 4 water bodies in 14 occasions with a bi-monthly frequency between 2015 and 2017 (total samples: 152 communities). Given that the study spanned periods of high and low waters during warm and cold seasons, each the 18 surveys fell within one of four different hydro-climatic conditions: low waters, cold season; high waters, cold season; low waters, warm season and high waters, warm season. In this design, we considered hydrometric variability in the system and thermal seasonality because they are the main temporal drivers of fish assemblage composition and ecosystem functioning (Scarabotti et al. 2017). This classification properly captures the similarity in environmental conditions among surveys with similar hydro-period and thermal conditions (see Supplementary table 1). Samplings were classified in cold (autumn and winter; April to September) and warm periods (spring and summer, October to March) and in low water (below overflow level) and high water periods (above overflow level), totaling four different combinations of climatic and hydrologic conditions: high waters-cold season (HC), high waters-warm season (HW), low waters-cold season (LC) and low waters-warm season (LW). We used an overflow level of 3.42 m at the Paraná city gauge station (Scarabotti et al., 2017). Fish were collected using both gillnets and beach seine nets. We deployed two gillnet batteries, each one of 80 m long x 1.7 m high, composed of eight panels of 10 m long with different mesh sizes (30, 42, 54, 70, 90, 110, 130 and 160 mm between opposed knots) for 12 h (dusk–dawn). Piscivorous fishes were captured and euthanized in the field by medullary denervation after percussive stunning. Each individual was identified, measured and weighed. The stomachs were preserved in 10% formalin and examined in the laboratory under a binocular microscope. Fish prey items were identified at species level whereas the invertebrate preys were identified at order level.

Palabras clave: Peces, Río Paraná Medio, Ocurrencia, Interacciones tróficas

Alcance geográfico

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Identificador del recurso

URI: http://hdl.handle.net/11336/160954

Colecciones

Datos de Investigación(INALI)
Datos de Investigación de INST.NAC.DE LIMNOLOGIA (I)

Citación

Borzone Mas, Dalmiro; Scarabotti, Pablo Augusto; (2022): Datos de ocurrencia y tróficos de los depredadores del Río Paraná. Consejo Nacional de Investigaciones Científicas y Técnicas. (dataset). http://hdl.handle.net/11336/160954

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Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)