Foodweb structure in small streams: do we need different models for the tropics?

Dudgeon, David; Cheung, Fion; Mantel, Sukhmani

doi:10.1899/09-058.1

Cited by 59 publications

(59 citation statements)

References 56 publications

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“…In both streams, most fishes consumed aquatic invertebrates, a finding consistent with those from studies of streams in other tropical regions (Deus, Petrere-Junior, 2003;Bonato et al, 2012;Dudgeon et al, 2010). Although most piscivorous tropical fishes are also capable of feeding 9 e160125 [9] on aquatic invertebrates, especially during early life stages (Winemiller, 1989), our data reveal a trend whereby proportions of aquatic invertebrates and fish in diets were inversely associated (Fig.…”

Section: Discussionsupporting

confidence: 88%

Seasonal variation in fish trophic networks in two clear-water streams in the Central Llanos region, Venezuela

et al. 2017

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Food webs are not static entities; consumer resource interactions vary in both time and space, which complicates depiction and comparisons of food web structures. We estimated fish assemblage structure and diets in two clear-water streams in the Venezuelan Llanos region (Charcote and Charcotico) and constructed trophic networks (sub-webs defined by fishes as the principal consumers) during four periods of the annual flood pulse. As stream conditions changed from high-water to low-water, we hypothesized that: 1) the piscivore-non-piscivore ratio would increase; 2) dietary diversity would decrease; 3) interspecific dietary overlap would decline; 4) fewer allochthonous food items would be consumed; and 5) food-web connectance would increase. The piscivore-non-piscivore abundance ratio was higher in both streams during the low-water period. Dietary diversity declined as water levels dropped and availability of aquatic habitats and resources declined, but interspecific dietary overlap was not lower. Contrary to our hypothesis, average interspecific dietary overlap increased at Charcote as the dry season progressed, even though dietary overlap among species was significantly lower than expected by chance. We did not find strong support for our hypotheses regarding seasonal patterns of consumption of allochthonous resources and food web connectance, both of which revealed little seasonal variation.Keywords: Aquatic ecosystem, Flood pulse, Predation, Predator-prey interactions, Trophic niche.Redes alimentares não são entidades estáticas; interações entre consumidores e recursos variam no tempo e no espaço, o que complica as representações das estruturas de redes alimentares. Nós estimamos a estrutura da assembléia de peixes e dieta em dois riachos de água clara na região venezuelana dos Llanos (Charcote e Charcotico) e construímos redes tróficas (sub-redes definidas por peixes como os principais consumidores) para quatro períodos do pulso anual de inundação. À medida que as condições dos riachos mudam de águas altas para águas baixas, nós hipotetizamos que: 1) a razão piscívoros e não piscívoros irá aumentar; 2) a diversidade da dieta irá diminuir; 3) a sobreposição alimentar interespecífica irá diminuir; 4) menos itens alimentares alóctones serão consumidos; e 5) a conectância da teia alimentar irá aumentar. A razão da abundância de piscívoros e não piscívoros foi maior em ambos riachos durante a estação de águas baixas. A diversidade da dieta declinou à medida que as águas baixavam e a disponibilidade de habitats aquáticos e recursos declinavam, mas a sobreposição alimentar interespecífica não foi menor. Contrária à nossa hipótese, a média de sobreposição alimentar interespecífica aumentou no Charcote à medida que a estação cheia progrediu, mesmo com a sobreposição alimentar significativamente menor do que o esperado ao acaso. Não encontramos forte suporte para nossas hipóteses relacionadas aos padrões sazonais de consumo de recursos alóctones e conectância da cadeia trófica, os quais revelaram pouca variação sazonal....

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Section: Discussionsupporting

confidence: 88%

Seasonal variation in fish trophic networks in two clear-water streams in the Central Llanos region, Venezuela

et al. 2017

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“…The study species are representative of families that are widespread and abundant in tropical Asian streams (Dudgeon 1999) and have extensive trophic links with other co-occurring taxa (e.g., Mantel et al 2004;Li and Dudgeon 2008;Dudgeon et al 2010). Given that d…”

mentioning

confidence: 99%

Preservation effects on C/N ratios and stable isotope signatures of freshwater fishes and benthic macroinvertebrates

Lau

Leung

Dudgeon

2012

Limnology & Ocean Methods

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“…However, this study revealed that both disturbance and bottom-up inter-guild effects were essential to forming the regional spatial pattern in predator taxonomic richness. Although effects of biotic interactions on species richness have been considered less important in stream invertebrates (Vinson and Hawkins 1998), significant relationships between predator and prey assemblages have been suggested (Jeffries and Lawton 1985, Warren and Gaston 1992, Dudgeon et al 2010, and predator-prey effects (i.e., inter-guild effects) on predator richness were found in this study. Inter-guild effects may be hindered by greater abiotic and biotic heterogeneity at global and continental scales (Freestone et al 2011), and then detection of inter-guild effects may depend on spatial scale.…”

Section: Environmental and Inter-guild Effects On Regional Gradientsmentioning

confidence: 54%

“…In addition, the types of food ingested are relatively well defined (Poff et al 2006); they can be categorized into five functional feeding guilds (collector-filterer, collector-gatherer, scraper, predator, and shredder; Merritt andCummins 1996, Poff et al 2006). Previous studies have suggested that prey assemblages have effects on predator assemblages and vice versa (Jeffries and Lawton 1985, Warren and Gaston 1992, Wallace et al 1999, Dudgeon et al 2010. For example, since prey species types are considered as the niche dimensions for predator species, higher prey species richness may provide a higher niche quality for predators (Jeffries and Lawton 1985).…”

Section: Introductionmentioning

confidence: 99%

Flood disturbance and predator–prey effects on regional gradients in species diversity

Mori

Saitoh

2014

Ecology

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Abstract. The effects of both abiotic factors and biotic interactions among guilds (i.e., inter-guild effects) have been suggested to be important for understanding spatial variation in species diversity; however, compared to the abiotic effects, the processes by which the interguild effects are mediated have been little described. Hence, we investigated stream invertebrate assemblages on Hokkaido Island, Japan, and assessed how the processes of determining regional patterns in species diversity differed among guilds (collector-filterers, collectorgatherers/shredders, scrapers, and predators) by taking both inter-guild and abiotic effects into consideration using Bayesian networks. Collector-gatherers/shredders, collector-filterers, and predators exhibited significant regional gradients in taxonomic richness. Gradients in the former two guilds can be generated by variation in flood disturbance regardless of interactions with other guilds. The gradient in predator taxonomic richness was indirectly related to the disturbance and was directly generated by bottom-up effects through their prey (collectorgatherers/shredders and collector-filterers). We found that not only environmental factors, but also inter-guild effects may be essential for forming the regional gradient in predators, unlike those for collector-gatherers/shredders and collector-filterers. The processes underlying the regional variation in taxonomic richness of the three guilds are interpreted in terms of the ''more individuals'' hypothesis, facilitation, and predator-prey relationships.

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Foodweb structure in small streams: do we need different models for the tropics?

Cited by 59 publications

References 56 publications

Seasonal variation in fish trophic networks in two clear-water streams in the Central Llanos region, Venezuela

Seasonal variation in fish trophic networks in two clear-water streams in the Central Llanos region, Venezuela

Preservation effects on C/N ratios and stable isotope signatures of freshwater fishes and benthic macroinvertebrates

Flood disturbance and predator–prey effects on regional gradients in species diversity

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