The food spectrum of the cardinal - tetra (Paracheirodon axelrodi, Characidae) in its natural habitat

Walker, Ilse

doi:10.1590/s0044-59672004000100009

Cited by 24 publications

(23 citation statements)

References 4 publications

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“…The ornamental fish Paracheirodon axelrodi (Characidae), the "Cardinal Tetra", which colonizes the floodplains of some rivers of the middle Rio Negro Basin, shows a similar feeding pattern as the fish species of this study (Tab.3): more than 40% of the cardinals ingest microcrustacea and chironomids, however, ingestion of algae and detritus is more frequent in the cardinal (Walker 2004). The remarkable similarity of the fish-and shrimp resource-spectra implies that foodchains are largely similar in the two predator categories.…”

Section: General Omnivorysupporting

confidence: 52%

Omnivory and resource - sharing in nutrient - deficient Rio Negro waters: stabilization of biodiversity?

Walker

2009

Acta Amaz.

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Amazonian biodiversity is notorious, this is also valid for the fauna of the mineral-deficient waters of the Rio Negro System. Some 25 years of research on the benthic fauna of Central Amazonian streams resulted in species-rich foodwebs with a high degree of omnivory within dense animal communities. To exemplify the taxonomic range of omnivorous consumers, the detailed resource spectra of 18 consumer species, including Protozoa (2 species), Platyhelminthes (1 species), insects (2 species), fish (6 species) and shrimps (Decapoda, 7 species), associated primarily with the benthic habitats of Rio Negro tributaries, are presented. Special features of omnivory are characterized, and the importance of litter-decomposing fungi as essential energy input into the foodwebs is documented. It is shown that general omnivory -diverse omnivore consumers sharing most of the resource types-is a prevalent feature. The relevance of this general omnivory for the maintenance of biodiversity is discussed.

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Section: General Omnivorysupporting

confidence: 52%

Omnivory and resource - sharing in nutrient - deficient Rio Negro waters: stabilization of biodiversity?

Walker

2009

Acta Amaz.

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“…Therefore, several studies have focused on understanding its basic biology, as an imperative step to find sustainable exploitation strategies (Burton et al, 1998;Walker, 2004;Anjos, Anjos, 2006;Oliveira et al, 2008;Tovar et al, 2009;Brito, Bazzoli, 2009;Gómez-Ramírez et al, 2011;ObandoBulla et al, 2013). In spite of these efforts, very little is known about the neuroendocrinology of reproduction in cardinal tetra, particularly regarding the neuroanatomical organization of the preoptic-hypothalamus-hypophysis complex.…”

Section: Introductionmentioning

confidence: 99%

Topological and histological description of preoptic area and hypothalamus in cardinal tetra Paracheirodon axelrodi (Characiformes: Characidae)

Rincón¹,

Obando

Tovar

et al. 2017

Neotrop. ichthyol.

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Topological and histological descriptions of the preoptic area and hypothalamus of the cardinal tetra Paracheirodon axelrodi were performed. Standard histological paraffin sections were used and stained with Nissl technique, and plastic sections for high-resolution optic microscopy (HROM). The preoptic area showed some differences related to the location of the magnocellular preoptic nucleus (PM) and the size of the neurons in this region, as they were the biggest in all the preoptic area. Additionally, within the preoptic area, the different structures that comprise the organum vasculosum of the lamina terminalis (OVLT) were identified and characterized. The hypothalamus could be subdivided in three regions -the ventral, the dorsal and the caudal hypothalamic regions -neuron morphology, size and staining pattern were similar in all of them.Keywords: Brain, High resolution optic microscopy (HROM), Organum vasculosum of the lamina terminalis (OVLT).Se realizó la descripción topológica e histológica del área preóptica e hipotálamo en el Neón cardenal Paracheirodon axelrodi. Se usaron cortes obtenidos con tecnicas histológicas estándar, coloreados con técnica de Nissl y secciones en resina con microscopía óptica de alta resolución (MOAR). El área preóptica muestra algunas diferencias relacionadas con la localización del núcleo preóptico magnocelular (PM) y el tamaño de algunas neuronas en esta región, puesto que estas eran las más grandes de toda el área preoptica. Adicionalmente, dentro del área preóptica, fue posible identificar y caracterizar las diferentes estructuras que componen el órgano vasculoso de la lámina media (OVLM). El hipotálamo puede sudividirse en tres zonas: la zona hipotalámica ventral, la zona hipotalámica dorsal y la zona hipotalámica caudal. La morfología de las neuronas de los núcleos que comprenden las diferentes zonas del hipotálamo tiene tamaño, forma y coloración similar.Palabras Clave: Cerebro, Microscopía óptica de alta resolucion (MOAR), Órgano vasculoso de la lámina terminal (OVLT).

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“…The cardinal, depending on changes in the water level, utilizes different habitats and capitalizes omnivorously on a diverse selection of food resources, including algae (Geisler & Annibal, 1986;Marshall, 2004;Walker, 2004). In a study of stomach contents of cardinals collected in streams and igapo´forest, Walker (2004) concluded that the cardinal is principally a predator of small invertebrate prey, feeding mainly on microcrustaceans and chironomid larvae.…”

Section: Introductionmentioning

confidence: 99%

Autotrophic energy sources for Paracheirodon axelrodi (Osteichthyes, Characidae) in the middle Negro River, Central Amazon, Brazil

2007

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The cardinal tetra (Paracheirodon axelrodi) is the most abundant species of the Brazilian ornamental fish trade, constituting more than 80% of the ornamental fish collected in the middle Negro River basin. Stable isotope analyses were used to identify the autotrophic carbon sources and trophic position for the cardinal in relation to the plant groups at the base of its foodchain. Filamentous algae, tree and plant leaves and cardinals were collected in stream habitats, flooded forest and interfluvial swamps (campos) during peak flood, falling water and low water periods. d 15 N values of the cardinal in relation to the plants at the base of the food chain indicated a trophic position of omnivore. Values of d 13 C for the plants ranged from À43.1 to À26.4%, with averages of À37.6, À30.4, and À29.4% for filamentous algae, flooded forest leaves, and campo leaves, respectively. The d 13 C values for the cardinal ranged from À35.0 to À27.9%, with an average of À31.4%. Relative contributions of plants to fish carbon were estimated in a two end-member mixing model which determined that the leaves (flooded forest and campo leaves combined) and filamentous algae had average relative contributions to cardinal carbon of 71% and 29%, respectively. However, seasonal variation in the relative contributions was encountered throughout the hydrological cycle. The cardinals least enriched in 13 C were encountered in November during the falling water period, indicating that they had perhaps recently migrated down from interfluvial campos where filamentous algae production is significant. Considering that algal production has been reported to be less than 1% of total primary production in the Negro River, these results could suggest some evidence of selective herbivory in the cardinal's food chain.

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The food spectrum of the cardinal - tetra (Paracheirodon axelrodi, Characidae) in its natural habitat

Cited by 24 publications

References 4 publications

Omnivory and resource - sharing in nutrient - deficient Rio Negro waters: stabilization of biodiversity?

Omnivory and resource - sharing in nutrient - deficient Rio Negro waters: stabilization of biodiversity?

Topological and histological description of preoptic area and hypothalamus in cardinal tetra Paracheirodon axelrodi (Characiformes: Characidae)

Autotrophic energy sources for Paracheirodon axelrodi (Osteichthyes, Characidae) in the middle Negro River, Central Amazon, Brazil

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