High importance of autochthonous basal food source for the food web of a Brazilian tropical stream regardless of shading

Neres‐Lima, Vinicius; Brito, Ernesto Fuentes; Krsulovic, Felipe Augusto Maurin; Detweiler, Angela M.; Hershey, Anne E.; Moulton, Timothy P.

doi:10.1002/iroh.201601851

Cited by 56 publications

(38 citation statements)

References 43 publications

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“…are secondary consumers, which have as basal food source periphyton algae which usually grows on rocks. Similar results were also found in other Atlantic rainforest stream in Rio de Janeiro (Brito et al, 2006;Neres-Lima et al, 2016). We believe that is possible that these animals are using leaf accumulations as shelter during daylight hours or even that they prey on invertebrates in the litter.…”

Section: Discussionsupporting

confidence: 87%

Distribution and abundance of freshwater decapods in an Atlantic rainforest catchment with a dammed future

2017

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Variations in physical characteristics along the course of a river influence habitat availability which reflects in species distribution. Knowledge of ecology and diversity of lotic species is important for evaluating how river ecosystems will respond to environmental impacts. Freshwater decapods are a group of high ecological and economic importance, but the knowledge about factors influencing their distribution is scarce in Brazil. We performed a survey of decapods to describe their abundance and distribution as well as to study their relationships with stream physical variables and especially their association with different substrates types. We studied 23 sites located in 15 tributaries of Guapiaçú River, RJ, where we collected decapods in different substrates types and measured a set of physical variables. We found five decapods species, including amphidromous and non-amphidromous shrimps and crabs. Decapods were strongly associated with leaf-litter substrates and their abundance was related to a multivariate axis describing longitudinal changes in stream characteristics. We concluded that decapods occurring in the Guapiaçú catchment inhabit mainly small streams with preserved riparian forests where they find shelter and potential prey of invertebrates. The ongoing project to build a dam on the Guapiaçú River will have negative consequences to migrating shrimps and we strongly recommend that mitigating actions, such the construction of structures to allow the passage of migrating fauna, should be taken.Keywords: shrimps, environmental factors, leaf litter, tropical stream, damming. Distribuição e abundância de decápodes de água doce e sua associação com variáveis ambientais em uma bacia hidrográfica de Mata Atlântica que será represada ResumoVariações nas características físicas de um rio ao longo do seu curso influenciam a disponibilidade de habitas e dessa forma a distribuição de espécies. O conhecimento sobre a ecologia e diversidade de espécies lóticas é importante para avaliar como esses ecossistemas responderão a impactos ambientais. Decápodes de água doce são um grupo de grande importância ecológica e econômica, contudo o conhecimento sobre fatores influenciando sua distribuição ainda é escasso no Brasil. Nós realizamos um levantamento de decápodes para descrever sua abundância e distribuição, bem como estudar sua relação com características físicas dos rios, especialmente sua associação com tipos diferentes de substrato. Nós estudamos 23 localidades distribuídas em 15 rios tributários do Rio Guapiaçú, RJ, onde coletamos decápodas em diferentes tipos de substratos e medimos um conjunto de variáveis físicas. Nós encontramos cinco espécies de decápodas incluindo camarões anfídromos e não anfídromos e caranguejos. Esses organismos foram fortemente associados a substratos de folhiço alóctone e sua abundância foi relacionada com um eixo PCA que descreve as mudanças nas características físicas longo do curso do rio. Nós concluímos que os decápodas que ocorrem na bacia do Rio Guapiaçú habitam princi...

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Section: Discussionsupporting

confidence: 87%

Distribution and abundance of freshwater decapods in an Atlantic rainforest catchment with a dammed future

2017

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“…olfersii (Decapoda: Palaemonidae) is a nocturnally active, omnivorous shrimp (Brito et al, 2006;Moulton, Souza, Silveira, & Krsulovic, 2004;Neres-Lima et al, 2016), and P. brasiliana (Decapoda: Atyidae) olfersii (Decapoda: Palaemonidae) is a nocturnally active, omnivorous shrimp (Brito et al, 2006;Moulton, Souza, Silveira, & Krsulovic, 2004;Neres-Lima et al, 2016), and P. brasiliana (Decapoda: Atyidae)…”

Section: Study Organismsmentioning

confidence: 99%

“…is an herbivorous shrimp (Neres- Lima et al, 2016) that is typically active during the day (P. Oliveira-Cunha personal observation).…”

Section: Study Organismsmentioning

confidence: 99%

Effects of incubation conditions on nutrient mineralisation rates in fish and shrimp

et al. 2018

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Consumer mineralisation of nutrients can affect ecosystem processes, such as primary productivity, community respiration and biogeochemical cycling. Researchers have not tested, however, the influence of standard incubation methods on mineralisation rates. Therefore, the influence of varied incubation methods on consumer mineralisation rates is poorly understood. Here, we investigated how incubation conditions affected the mineralisation rates of ammonium and phosphate of two species of fish and two species of shrimp. For each species, we measured mineralisation rates during the day and at night in two incubation environments (standard and modified to reduce stress). We also estimated the effect of conspecific density (1, 3 or 5 individuals) and the duration of incubation (after 15, 30, 45, 60 and 75 min) on mineralisation for a species of shrimp. Our results indicated mass‐specific N mineralisation by three species was influenced by the time of day, and for two of the species, mass‐specific N mineralisation was also influenced by incubation conditions. Mass‐specific mineralisation rates for both N and P by a species of shrimp decreased significantly with increasing incubation time, but we did not detect significant differences in mineralisation among incubation durations or densities for either element. Mass‐specific mineralisation rates for P were negatively correlated with body size for all studied species, as previously reported. Only the two species of shrimp showed the expected negative relationship between mass‐specific N mineralisation rates and body size. Our results suggest that the mechanisms by which organisms excrete elements are differentially influenced by incubation conditions. Our study highlights the need to develop methods specific to the organisms of interest, especially the duration and the time of day of the incubation. Additionally, our attempt to influence mineralisation rates by modifying chamber design was mostly ineffective, indicating that this measure may not be a priority for future studies.

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“…However, several studies have found surprisingly high levels of autochthony (i.e., aquatic diet) in smallstream consumers, despite low incident light and high allochthonous inputs (McCutchan & Lewis, 2002;Neres-Lima et al, 2016;Stenroth et al, 2015;Brett et al, 2017). This deviation from predictions occurs presumably because stream autotrophic productioneven if occurring at low levels-is a much better resource than terrestrially derived organic matter, and would therefore, be favored by stream consumers (Brett et al, 2017).…”

Section: Introductionmentioning

confidence: 97%

Catchment properties predict autochthony in stream filter feeders

et al. 2018

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Stream ecological theory predicts that the use of allochthonous resources declines with increasing channel width, while at the same time primary production and autochthonous carbon use by consumers increase. Although these expectations have found support in several studies, it is not well known how terrestrial runoff and/or inputs of primary production from lakes alter these longitudinal patterns. To investigate this, we analyzed the diet of filterfeeding black fly and caddisfly larvae from 23 boreal streams, encompassing gradients in drainage area, land cover and land use, and distance to nearest upstream lake outlet. In five of these streams, we also sampled repeatedly during autumn to test if allochthony of filter feeders increases over time as new litter inputs are processed. Across sites, filter-feeder autochthony was 21.1-75.1%, did not differ between black fly and caddisfly larvae, was not positively related to drainage area, and did not decrease with distance from lakes. Instead, lake and wetland cover promoted filter-feeder autochthony independently of stream size, whereas catchment-scale forest cover and forestry reduced autochthony. Further, we found no seasonal increase in allochthony, indicating low assimilation of particles derived from autumn litter fall. Hence, catchment properties, rather than local conditions, can influence levels of autochthony in boreal streams.

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High importance of autochthonous basal food source for the food web of a Brazilian tropical stream regardless of shading

Cited by 56 publications

References 43 publications

Distribution and abundance of freshwater decapods in an Atlantic rainforest catchment with a dammed future

Distribution and abundance of freshwater decapods in an Atlantic rainforest catchment with a dammed future

Effects of incubation conditions on nutrient mineralisation rates in fish and shrimp

Catchment properties predict autochthony in stream filter feeders

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