Seasonal and spatial shifts in copepod diets within tropical estuaries measured by fatty acid profiles

Moura, Gustavo Correia de; Barbosa, José Etham de Lucena; Patrício, Joana; Nery, Janiele França; Gonçalves, Ana M. M.

doi:10.1016/j.ecolind.2016.04.037

Cited by 14 publications

(7 citation statements)

References 57 publications

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“…It is probably biochemically irrelevant whether algal production in lakes is pelagic or benthic because, for example, benthic and pelagic diatoms are closely related and have similar nutritional value. From this biochemical perspective, riverine planktonic diatoms advected into an estuary would be expected to be high food quality for herbivorous invertebrates (De Moura, de Lucena Barbosa, Patrício, Nery & Gonçalves, ; Jassby & Cloern, ), whereas the autochthonous production by Phragmites or Spartina would be expected to be of very low in quality. A similar phenomenon has been observed in the Upper Mississippi, where consumers (bluegill sunfish, zebra mussels, pocketbook mussels) from the main channel (where diatoms predominated) had significantly higher long‐chain PUFA content than the same species occupying backwater habitats, where detrital inputs and cyanobacteria were more prevalent (Larson et al., ).…”

Section: Marine Allochthony: the Exception That Proves The Rule!mentioning

confidence: 99%

How important are terrestrial organic carbon inputs for secondary production in freshwater ecosystems?

et al. 2017

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Abstract1. Many freshwater systems receive substantial inputs of terrestrial organic matter.Terrestrially derived dissolved organic carbon (t-DOC) inputs can modify light availability, the spatial distribution of primary production, heat, and oxygen in aquatic systems, as well as inorganic nutrient bioavailability. It is also well-established that some terrestrial inputs (such as invertebrates and fruits) provide highquality food resources for consumers in some systems.2. In small to moderate-sized streams, leaf litter inputs average approximately three times greater than the autochthonous production. Conversely, in oligo/mesotrophic lakes algal production is typically five times greater than the available flux of allochthonous basal resources.3. Terrestrial particulate organic carbon (t-POC) inputs to lakes and rivers are comprised of 80%-90% biochemically recalcitrant lignocellulose, which is highly resistant to enzymatic breakdown by animal consumers. Further, t-POC and heterotrophic bacteria lack essential biochemical compounds that are critical for rapid growth and reproduction in aquatic invertebrates and fishes. Several studies have directly shown that these resources have very low food quality for herbivorous zooplankton and benthic invertebrates. 4.Much of the nitrogen assimilated by stream consumers is probably of algal origin, even in systems where there appears to be a significant terrestrial carbon contribution. Amino acid stable isotope analyses for large river food webs indicate that most upper trophic level essential amino acids are derived from algae. Similarly, profiles of essential fatty acids in consumers show a strong dependence on the algal food resources.5. Primary production to respiration ratios are not a meaningful index to assess consumer allochthony because respiration represents an oxidised carbon flux that cannot be utilised by animal consumers. Rather, the relative importance of allochthonous subsidies for upper trophic level production should be addressed by considering the rates at which terrestrial and autochthonous resources are consumed and the growth efficiency supported by this food.6. Ultimately, the biochemical composition of a particular basal resource, and not just its quantity or origin, determines how readily this material is incorporated into upper trophic level consumers. Because of its highly favourable biochemical composition and greater availability, we conclude that microalgal production supports most animal production in freshwater ecosystems. | WHY DOES ALLOCHTHONY MATTER?A better understanding of where and how allochthony modifies aquatic food web processes will improve our ability to predict how land-use and climate change affect organic carbon export from watersheds to lakes and rivers and how this matter influences upper trophic level production in aquatic systems. If invertebrate and fish consumers in rivers and lakes are strongly subsidised by allochthonous carbon inputs, then watersheds and especially riparian zone management will potentially have as mu...

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Section: Marine Allochthony: the Exception That Proves The Rule!mentioning

confidence: 99%

How important are terrestrial organic carbon inputs for secondary production in freshwater ecosystems?

et al. 2017

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“…data). Moreover, Moura et al (2016) found that zooplankton food sources in the Paraiba Estuary showed lower feeding quality with lower essential fatty acids concentration.…”

Section: H a N G E S I N D I E T O F A B R A S I L I E N S I S W mentioning

confidence: 99%

Do different degrees of human activity affect the diet of Brazilian silverside Atherinella brasiliensis?

Alves

Patrício

Dolbeth

et al. 2016

Journal of Fish Biology

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The aim of the present study was to test whether different degrees of human activity affect the diet of the Brazilian silverside Atherinella brasiliensis in two tropical estuaries. Fish were collected along the salinity gradient of two Brazilian estuaries, the heavily impacted Paraiba Estuary and the less impacted Mamanguape Estuary, in the dry and wet seasons. The findings confirm that A. brasiliensis has generalist feeding habits and is able to change its diet under different environmental conditions. The results indicate clear spatial (i.e. along the estuarine gradient) changes in diet composition in both estuaries, but diet was also influenced by the degree of anthropogenic disturbance. During the wet season in the nutrient enriched Paraiba Estuary, when human activity was higher, the diet of A. brasiliensis was poorer and dominated by few dietary items, reflecting the potential impoverishment of prey items in this heavily disturbed system. The specimens collected in the most affected estuary also had a greater frequency of micro-plastics and parasites in their stomachs, reflecting the greater degree of human disturbance in the estuary. The present findings suggest that the diet of A. brasiliensis could be a useful indicator of changes in the ecological quality of these and other tropical estuaries of the western Atlantic Ocean.

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“…Therefore, our findings reinforce that spatial heterogeneity is an important factor that influence fish feeding habits. With regards to the macrofauna and zooplankton in Mamanguape estuary, some studies have shown a distribution pattern at different spatial scales (Nobrega-Silva et al, 2016;Moura et al, 2016;Linden et al, 2017), which has an important role in this food web (Campos et al, 2015;Claudino et al, 2015;Figueiredo, Pessanha 2016).…”

Section: Discussionmentioning

confidence: 99%

Intraspecific food resource partitioning in Brazilian silverside Atherinella brasiliensis (Atheriniformes: Atherinopsidae) in a tropical estuary, Brazil

et al. 2019

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We investigated the intraspecific partitioning of food resources of the Brazilian silverside Atherinella brasiliensis in a tropical estuary. A total of 1,099 stomachs were analyzed, and the diet consisted mainly of Gastropoda, Ceratopogonidae larvae, Decapoda larvae, Calanoida, Cyclopoida, Hymenoptera and Brachyura. Ordination of the mean volumetric percentage contribution of preys indicated differences in the dietary compositions between sites and size classes. By SIMPER analysis, we detected high dissimilarity between size classes, suggesting ontogenetic niche shifts: the diet of the early juveniles was based in zooplankton, whereas adults consumed mainly benthic macroinvertebrates. These shifts were related to changes in feeding structures and foraging abilities that show a strong relationship with body size, and showed functional trade-offs in swimming capacity, and feeding strategies used to capture prey. Differences in the diet between size classes and habitat selection by Brazilian silverside are likely strategies to avoid intraspecific competition, clearly related to the abundance and accessibility of resources along the estuarine habitats.Nós investigamos a partição intraespecífica de recursos alimentares do peixe-rei Atherinella brasiliensis em um estuário tropical. Um total de 1.099 estômagos foi analisado, e a dieta foi constituída principalmente de Gastropoda, Larva de Ceratopogonidae, Larva de Decapoda, Calanoida, Cyclopoida, Hymenoptera e Brachyura. A análise de ordenação da contribuição do volume das presas indicou diferenças na composição da dieta entre locais e classes de tamanho. Pela análise do SIMPER, nós detectamos alta dissimilaridade entre as classes de tamanho, sugerindo mudanças ontogenéticas: a dieta dos indivíduos menores foi baseada em zooplâncton, enquanto os maiores indivíduos consumiram principalmente macroinvertebrados bentônicos. Essas variações foram relacionadas com mudanças nas estruturas para captura do alimento e na habilidade de forrageamento que evidenciaram uma forte relação com o tamanho do corpo, e mostraram trade-offs funcionais na capacidade de natação e no modo de captura das presas. Diferenças na dieta entre as classes e a seleção de habitat pelo peixe-rei são estratégias para evitar a competição intraespecífica, claramente relacionada com a abundância e a acessibilidade dos recursos alimentares ao longo dos habitats estuarinos. Palavras-chave:Áreas costeiras, Estratégia Trófica, Heterogeneidade de habitat.

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Seasonal and spatial shifts in copepod diets within tropical estuaries measured by fatty acid profiles

Cited by 14 publications

References 57 publications

How important are terrestrial organic carbon inputs for secondary production in freshwater ecosystems?

How important are terrestrial organic carbon inputs for secondary production in freshwater ecosystems?

Do different degrees of human activity affect the diet of Brazilian silverside Atherinella brasiliensis?

Intraspecific food resource partitioning in Brazilian silverside Atherinella brasiliensis (Atheriniformes: Atherinopsidae) in a tropical estuary, Brazil

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