Lake size, macrophytes, and omnivory contribute to food web linkage in temperate shallow eutrophic lakes

Sagrario, María de los Ángeles González; Golpe, Daniela Rodríguez; Sala, Luciano La; Vuichard, Guillermina Sánchez; Minotti, Priscilla Gail; Panarello, Héctor O.

doi:10.1007/s10750-018-3594-z

Cited by 6 publications

(2 citation statements)

References 62 publications

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“…Fish diet analyses support the relevance of the littoral zone as a foraging area with an estimated contribution of littoral carbon accounting over the 80% of the biomass ingested by pelagic fish species (e.g. Odontesthes bonariensis, Oligosarcus jenynsii and Rhamdia quelem) (González Sagrario et al, 2018). Such strong linkage between the littoral and the pelagic occurs through the consumption of littoral macroinvertebrates (e.g.…”

Section: Discussionmentioning

confidence: 90%

Chemically-induced plasticity in early life history ofPalaemon argentinus: are chemical alarm cues conserved within palaemonid shrimps?

Ituarte

Vázquez

Bas

2019

Journal of Experimental Biology

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Most aquatic animals use infochemicals from both conspecifics and heterospecifics to assess local predation risks and enhance predator detection. Released substances from injured conspecifics and other species (chemical alarm cues) are reliable cues to indicate an imminent danger in a specific habitat and often mediate the development of inducible defenses. Amphibian and fish embryos have been shown to acquire this information while at the embryonic stage of development, in relation to the developing nervous system and sensory development. With the exception of Daphnia, there is no information on chemically mediated responses to alarm cues in embryos of any crustacean groups. Therefore, we tested whether embryo exposure to chemical cues simulating predation on conspecifics or heterospecifics (closely related, non-coexisting species), or a mixture of both, alters embryonic developmental time, size and morphology of the first larval instar in Palaemon argentinus (Crustacea: Decapoda). Embryonic exposure to chemical alarm cues from conspecifics shortened the embryonic developmental time and elicited larger larvae with a longer rostrum. Rostrum length of the first larval instar changed independently of their size, thus elongated rostra can be considered a defensive feature. Embryonic developmental time was not altered by chemical alarm cues from either heterospecifics or the mixed cues treatment; however, exposure to these cues resulted in larger larvae compared with the control group. Chemically induced morphological plasticity in larvae in response to alarm cues from con-and heterospecifics suggests that such cues are conserved in palaemonids shrimps, providing embryos with an innate recognition of heterospecific alarm cues as predicted by the phylogenetic relatedness hypothesis.

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Section: Discussionmentioning

confidence: 90%

Chemically-induced plasticity in early life history ofPalaemon argentinus: are chemical alarm cues conserved within palaemonid shrimps?

Ituarte

Vázquez

Bas

2019

Journal of Experimental Biology

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“…Their shallowness favors the interaction between sediments and the water column through wind-driven turbulence. The dominant wind direction in the region is South-Southeast, making the fetch of Las Mostazas (1.4 km) higher than Nahuel Ruca (1.15) and Los Carpinchos (0.65;Gonza ´lez-Sagrario et al 2018). As most lakes occurring in the continental plain in the southern part of the Pampean region, they show typical pfanne or wanne profiles and tend to have rounded or slightly elongated shapes (Diovisalvi et al 2015).…”

Section: Study Sitementioning

confidence: 99%

Within versus between-lake variability of sedimentary diatoms: the role of sampling effort in capturing assemblage composition in environmentally heterogeneous shallow lakes

Hassan

2018

J Paleolimnol

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The effect of within-lake diatom assemblages variability on sample representativity and its subsequent impact on between-lake comparisons were addressed in three environmentally heterogeneous shallow lakes from the Argentinean Pampas. Surface sediment samples were collected from the open waters and the highly vegetated littoral areas on a seasonal basis and analyzed for diatom assemblages composition. Within-lake variability was assessed by comparing the Bray Curtis distances between original data and the Monte Carlo-simulated average assemblages composition through non-metric multidimensional scaling (NMDS). Diatom assemblages showed a high variability in composition, evidencing large dispersions of samples around the centroid in NMDS plots. Permutational multivariate analysis of variance tests signaled significant differences in average composition between the three lakes, related mainly to their differences in conductivity and depth. Representativity of original samples was assessed through principal coordinates analyses ordinations of the three lakes, being samples lying in the overlapping areas of the plot classified as poor representatives of between-lake differences. Several samples, both from littoral and open waters, were classified as poor representatives through this method. Simulation allowed us to evaluate the effect of sample replication on improving between-lake comparisons, and showed that collecting two littoral and two open-water samples allowed us to faithfully capture differences in average composition among the three lakes. Hence, the results suggest that using a single sample to estimate diatom assemblages composition in these lakes should be avoided, as it fails to capture between-lake differences, leading to biases in compositional comparisons among lakes and regions. Consequently, including multiple samples from each lake when constructing calibration sets would be the best option to obtain reliable paleoenvironmental reconstructions from single sediment cores in these environmentally heterogeneous shallow lakes.

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Food web characteristics of fish communities across degraded lakes provide insights for management in multi-stressor environments

et al. 2020

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Lake size, macrophytes, and omnivory contribute to food web linkage in temperate shallow eutrophic lakes

Cited by 6 publications

References 62 publications

Chemically-induced plasticity in early life history ofPalaemon argentinus: are chemical alarm cues conserved within palaemonid shrimps?

Chemically-induced plasticity in early life history ofPalaemon argentinus: are chemical alarm cues conserved within palaemonid shrimps?

Within versus between-lake variability of sedimentary diatoms: the role of sampling effort in capturing assemblage composition in environmentally heterogeneous shallow lakes

Food web characteristics of fish communities across degraded lakes provide insights for management in multi-stressor environments

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