[No Title Available]

Zuanon, Jansen; Sazima, Iván

doi:10.1590/s1676-06032005000100012

Cited by 14 publications

(10 citation statements)

References 3 publications

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“…Likewise, there is no information available about the host species exploited by H. anisitsi, P. maculatus or other stegophilines in natural environments. The same is true for most vandeliines, except for Frontiers in Ecology and Evolution | www.frontiersin.orga few visual records of specimens observed attached to gill arches of some large fishes (Zuanon and Sazima, 2005) or experiments in aquaria or observation on large fishes tied to river banks (Machado and Sazima, 1983;Zuanon and Sazima, 2004).…”

Section: Introductionmentioning

confidence: 82%

Unrevealing Parasitic Trophic Interactions—A Molecular Approach for Fluid-Feeding Fishes

2018

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Fish diets have been traditionally studied through the direct visual identification of food items found in their stomachs. Stomach contents of Vandeliinae and Stegophilinae (family Trichomycteridae) parasite catfishes, however, cannot be identified by usual optical methods due to their mucophagic, lepidophagic, or hematophagic diets, in such a way that the trophic interactions and the dynamics of food webs in aquatic systems involving these catfishes are mostly unknown. The knowledge about trophic interactions, including difficult relation between parasites and hosts, are crucial to understand the whole working of food webs. In this way, molecular markers can be useful to determine the truly hosts of these catfishes, proving a preference in their feeding behavior for specific organisms and not a generalist. Sequences of cytochrome oxidase subunit 1 (COI) were successfully extracted and amplified from mucus or scales found in the stomach contents of two species of stegophilines, Homodiaetus anisitsi, and Pseudostegophilus maculatus, to identify the host species. The two species were found to be obligatory mucus-feeders and occasionally lepidophagic. Selection of host species is associated to host behavior, being constituted mainly by substrate-sifting benthivores. Characiformes are preferred hosts, but host choice depends on what characiform species are available in their environments, usually corresponding to the most abundant species. This is the first time that host species of parasitic fishes bearing mucophagous habits are identified, and demonstrates the effectiveness of the extraction and amplification of mitochondrial DNA from the ingested mucus in gut contents. The molecular markers effectively allowed determine parasite preferences and helps in better understanding the food web and trophic interaction on which fish species are involved. Despite, the methodology applied here can be used for an infinitive of organisms improving ecological trophic studies.

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Section: Introductionmentioning

confidence: 82%

Unrevealing Parasitic Trophic Interactions—A Molecular Approach for Fluid-Feeding Fishes

2018

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“…(Trichomycteridae), ranked within the top 2% rarest species, has a very particular oral apparatus to feed on blood from other small-bodied fishes [37], being one of the few haematophagous species recorded in small Amazonian streams. The poeciliid Fluviphylax simplex, ranked within the top 5% rarest species, is a miniature fish with highly specialized morphology (e.g.…”

Section: Discussionmentioning

confidence: 99%

Rare species contribute disproportionately to the functional structure of species assemblages

et al. 2016

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There is broad consensus that the diversity of functional traits within species assemblages drives several ecological processes. It is also widely recognized that rare species are the first to become extinct following human-induced disturbances. Surprisingly, however, the functional importance of rare species is still poorly understood, particularly in tropical species-rich assemblages where the majority of species are rare, and the rate of species extinction can be high. Here, we investigated the consequences of local and regional extinctions on the functional structure of species assemblages. We used three extensive datasets (stream fish from the Brazilian Amazon, rainforest trees from French Guiana, and birds from the Australian Wet Tropics) and built an integrative measure of species rarity versus commonness, combining local abundance, geographical range, and habitat breadth. Using different scenarios of species loss, we found a disproportionate impact of rare species extinction for the three groups, with significant reductions in levels of functional richness, specialization, and originality of assemblages, which may severely undermine the integrity of ecological processes. The whole breadth of functional abilities within species assemblages, which is disproportionately supported by rare species, is certainly critical in maintaining ecosystems particularly under the ongoing rapid environmental transitions.

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“…6A), delimited mostly by frontals and only posterior end by supraoccipital. Frontals mostly separated from each other at midline by fontanels, contacting at a small portion at their midlength, corresponding to the epiphyseal bar, vagility limits, as reported for a congener (Zuanon & Sazima, 2005). Although the Rio Taquari has historically been reported to carry a large sediment load, this characteristic has intensified starting in the late 1970's, with the increase of agriculture and pasture in the region (Soriano et al, 2001).…”

Section: Descriptionmentioning

confidence: 87%

Two new catfish species of typically Amazonian lineages in the Upper Rio Paraguay (Aspredinidae: Hoplomyzontinae and Trichomycteridae: Vandelliinae), with a biogeographic discussion

Dagosta

Pinna

2021

Pap. Avulsos Zool.

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Two new species of particular biogeographic significance are described from the upper rio Paraguay basin, one of the genus Paracanthopoma (Trichomycteridae, Vandelliinae) and the other of the genus Ernstichthys (Aspredinidae, Hoplomyzontinae). The two species occur sympatrically in the Rio Taquarizinho, tributary of the Rio Taquari, in the upper Paraguay system. Paracanthopoma saci is distinguished from its only congener, P. parva, by a spatulate caudal peduncle; a minuscule premaxillary dentition (reduced to three delicate teeth); the supraorbital latero-sensory canals opening as two separate s6 pores; the caudal fin slightly convex or truncate with round edges; the skull roof entirely open, unossified; the origins of dorsal and anal fins approximately at same vertical; and the pelvic fin with three rays. Ernstichthys taquari is diagnosed among congeners by the narrow bony shields on dorsal and ventral series, not overlapping or contacting each other; by the presence of seven or eight serrations on the posterior margin of the pectoral spine; and by the pectoral-fin spine only slightly larger than subsequent soft rays. Both Paracanthopoma and Ernstichthys were previously unknown outside of the Greater Amazonian river systems (Amazon, Orinoco, Essequibo and smaller surrounding drainages). Their presence restricted to the Rio Taquari is unexpected and suggests a peculiar biogeographical history. Ancestral geographic distributions were reconstructed using S-DIVA and BBM methods in RASP. A majority of resulting hypotheses support that the two species reached the Paraguay from the Amazon. The alternative explanation accounts for their presence in the Paraguay by vicariant events. In no case, their presence in the Paraguay is an ancestral distribution with subsequent Amazonian dispersal. Though unusual, this pattern is also seen in a few other fish taxa, showing that the Rio Taquari is biogeographically hybrid, combining elements from both the Paraguay and Amazon drainages.

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[No Title Available]

Cited by 14 publications

References 3 publications

Unrevealing Parasitic Trophic Interactions—A Molecular Approach for Fluid-Feeding Fishes

Unrevealing Parasitic Trophic Interactions—A Molecular Approach for Fluid-Feeding Fishes

Rare species contribute disproportionately to the functional structure of species assemblages

Two new catfish species of typically Amazonian lineages in the Upper Rio Paraguay (Aspredinidae: Hoplomyzontinae and Trichomycteridae: Vandelliinae), with a biogeographic discussion

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