Food webs of the Paraná River floodplain: Assessing basal sources using stable carbon and nitrogen isotopes

Marchese, Mercedes; Saigo, Miguel; Zilli, Florencia Lucila; Capello, Soledad; Devercelli, Melina; Montalto, Luciana; Paporello, Graciela; Wantzen, Karl M.

doi:10.1016/j.limno.2013.11.004

Cited by 55 publications

(42 citation statements)

References 63 publications

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“…In our study, those values were usually higher, (13 0 / 00 ) coinciding with results reported for different macroinvertebrates species (including P. canaliculata) in studies done in streams and large rivers of the Neotropical region (Marchese et al, 2014;Ocon et al, 2013). This could be explained by the enrichment in δ 15 N registered in Pampean streams due to the process of denitrification in the sediments (Acuña et al, 2010).…”

Section: Discussionsupporting

confidence: 92%

Dieta de Pomacea canaliculata (Gastropoda: Ampullariidae) en su hábitat natural basada en análisis de contenidos digestivos e isótopos estables

et al. 2016

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Pomacea canaliculata is native to Rio de la Plata basin, and it is invasive in most of South and Southeast Asia after accidental introduction during unsuccessful attempts to establish commercial aquaculture of this species, and being present, the number one pest of rice crops in the region. Investigations in its native habitat are still needed because fundamental issues of its trophic ecology remain unknown. The aim of this research was to study the diet of P. canaliculata in its natural habitat through gut content techniques and stable isotopes of 13C and 15N. Biological samples were taken from November 2009 to December 2010 in Carnaval stream, a characteristic Pampean stream. Samples for stable isotopes of 13C and 15N using of a mixing model were collected in November 2011. The trophic strategy diagram evinced a generalist diet with high consumption of detritus followed by the vascular plants and algae. The mixing model results indicated that the relative contribution to the diet was similar for all basal resources: fine and coarse particulate organic matter, epipelon and aquatic macrophytes (approximately 40 %). These results evidenced a strong dietary plasticity for the species.

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Section: Discussionsupporting

confidence: 92%

Dieta de Pomacea canaliculata (Gastropoda: Ampullariidae) en su hábitat natural basada en análisis de contenidos digestivos e isótopos estables

et al. 2016

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“…Indeed, most of analyzed taxa were classified as gatherer collectors with detritus as the most important feeding item. The great importance of the detritus energy pathway in the floodplain of the Middle Paraná River has been evidenced in previous studies (Ezcurra de Drago et al, 2007;Marchese et al, 2014). Primary production of macrophytes in this system is very high, for example, the biomass fluctuated between 0.30 and 8.67 t dry weight ha-1 (Sabattini & Lallana, 2007).…”

Section: Discussionsupporting

confidence: 57%

A closer look at the main actors of Neotropical floodplain food webs: functional classification and niche overlap of dominant benthic invertebrates in a floodplain lake of Paraná River

Saigo¹,

Marchese²,

Wantzen

2016

Iheringia, Sér. Zool.

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ABSTRACT. Functional classifi cation of animals is necessary to enhance the predictive power of food web models. However, while there is a large database for functional classifi cation of benthic invertebrates (Functional Feeding Groups, FFG) in the temperate zone, the attribution of individual species of riverine invertebrates is still in its infancies in the Neotropical Region. Diff erent authors hypothesized that diet breadth was larger in the Tropics, however detailed analyses are scarce. In the present study we aimed at classifying dominant benthic taxa of the Middle Paraná River fl oodplain (Argentina) into trophic guilds by diet and niche overlap analysis. We sampled twelve taxa of benthic invertebrates from a fl oodplain lake during low water season and performed a gut content analysis as a baseline for FFG classifi cation. We also used available diet information of other common taxa for statistical analysis. Then, we compared the variance of niche overlap, using Pianka's index, with that of simulated null model. After that we grouped taxa using Morisita similarity index with a threshold of 0.6 and compared niche overlap with null models within and between FFGs. Observed variance of niche overlap was greater than expected by chance, confi rming the presence of FFGs among analyzed taxa. Considering trophic similarity of species, we identifi ed four FFGs: collectors, omnivores, herbivores and predators. Niche overlap was greater than expected by stochastic null models within FFGs, and smaller between FFGs. Nearly one third of analyzed taxa were classifi ed in a diff erent FFG than their congeners of the Holarctic region. This result indicates that classifi cations performed in the Holarctic region should be used with care in the Neotropical region, even in subtropical systems.

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“…al. ; Kuzyk et al ; Weissenberger et al ; Lu et al ; Marchese et al ; Pingram et al ), as well as in the interval of the values of δ 13 C of foliage of dominant tree species and soils in this region (Menyailo et al ).…”

Section: Discussionmentioning

confidence: 94%

Differences in organic matter and bacterioplankton between sections of the largest Arctic river: Mosaic or continuum?

Gladyshev

Kolmakova

Толомеев

et al. 2015

Limnology & Oceanography

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We studied biogeochemical characteristics, including organic carbon and nitrogen contents, fatty acid (FA) composition, stable isotope ratios, and primary production in conjunction with species composition of bacterioplankton, using next generation sequencing, in the Yenisei River along a distance ∼1800 km. Basing on FA composition of particulate organic matter (POM) and on other indicators of sources of POM, the river was subdivided into four sections. The upper section 1, situated in mountain region, was the net source of high‐quality autochthonous organic matter, produced primarily by diatoms and partly consumed by specialized bacteria species. Section 2 in plain taiga was net sink of high quality allochthonous and autochthonous organic matter, produced by cyanobacteria and green algae. Section 3 was net sink of organic matter, primarily allochthonous, consumed by the specialized species of bacteria. The lowest section 4, situated in tundra, was primarily the conduit of recalcitrant terrestrial organic matter, but also the net source of autochthonous organic matter, produced by diatoms. Biogeochemical traits of sections of the Yenisei River evidently shaped dominant species composition of bacterioplankton of these sections. Regarding the biogeochemical and microbiological data, we concluded that the Yenisei River ecosystem complexly combines features of river mosaic, river continuum, and “neutral pipe.”

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Food webs of the Paraná River floodplain: Assessing basal sources using stable carbon and nitrogen isotopes

Cited by 55 publications

References 63 publications

Dieta de Pomacea canaliculata (Gastropoda: Ampullariidae) en su hábitat natural basada en análisis de contenidos digestivos e isótopos estables

Dieta de Pomacea canaliculata (Gastropoda: Ampullariidae) en su hábitat natural basada en análisis de contenidos digestivos e isótopos estables

A closer look at the main actors of Neotropical floodplain food webs: functional classification and niche overlap of dominant benthic invertebrates in a floodplain lake of Paraná River

Differences in organic matter and bacterioplankton between sections of the largest Arctic river: Mosaic or continuum?

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