freshwater biota
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2021 ◽  
Vol 10 (4) ◽  
Author(s):  
Graziella Ziino ◽  
Luca Nalbone ◽  
Filippo Giarratana ◽  
Beatrice Romano ◽  
Fabrizio Cincotta ◽  
...  

It is widely accepted that human is exposed to microplastics through food consumption, however data occurrence in foodstuffs are still little and basically limited to seafood. In this study, the presence of microplastics was investigated in icefish (Neosalanx spp.) samples sourced from various mass-market retailers in Italy, supplied as frozen, glazed and vacuum-packed product. Icefish is a small freshwater fish widely imported in Europe from China as surrogate of other fish species subjected to commercial restriction, consumed whole after cooking in several culinary preparation. The samples (~10 g of icefish from each of the 40 packs tested) were digested using a solution of 10% potassium hydroxide and filtered through a 5 μm pore-size filter. Filters of the samples were observed under a stereomicroscope and the chemical composition of the items detected were analysed by FTIR spectroscopy. A total of 163 items were counted in 37 (92.5%) samples with a mean value of 0.42±0.28 items/g w.w. Fibers were the most detected morphotype and several plastic polymers, such as polypropylene, polyethylene, polyethylene terephthalate and polystyrene, were identified by FT-IR analysis. As store-bought samples, the sources of microplastics could be substantially related to contamination during food processing. However, an intravital exposure to microplastics present in the surroundings waters cannot be ruled out. More foodstuffs need to be investigated for microplastic presence. In this study, microplastic occurrence was reported in freshwater biota intended for human consumption sampled directly from supermarket contributing to the risk assessment of human exposure to microplastics via food consumption.


Author(s):  
Latifa Mirzatika Al-Rosyid ◽  
Harmin Sulistiyaning Titah ◽  
Irwan Bagyo Santoso ◽  
Sarwoko Mangkoedihardjo

This paper review research works on BOD/COD ratio toxicity to three bioindicators, namely: Daphnia magna, Artemia salina, and Brachydanio rerio. Treatment methods are divided into natural, biological, physical, chemical, combined treatment, and phytotechnology for various types of processing operations such as municipal and industrial wastewater treatment plants, various effluent treatment, landfill leachate, and organic matter. A. salina shows the lowest toxicity value of the BOD/COD ratio and shows it can withstand processing conditions that are not biodegradable. Then followed by B. rerio and D. magna. Furthermore, the disposal limits are standardized for the protection of freshwater biota. In addition, it must be considered whether there is any other potential of disposal into the receiving environment, and if so, what form of disposal and how much, to protect the biota.


2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Alexander M. Milner ◽  
Susanna A. Wood ◽  
Catherine Docherty ◽  
Laura Biessy ◽  
Masaki Takenaka ◽  
...  

AbstractThe Japanese macaque (Macaca fuscata) is native to the main islands of Japan, except Hokkaido, and is the most northerly living non-human primate. In the Chubu Sangaku National Park of the Japanese Alps, macaques live in one of the coldest areas of the world, with snow cover limiting the availability of preferred food sources. Winter is typically a bottleneck for food availability potentially resulting in marked energy deficits, and mortality may result from famine. However, streams with groundwater upwelling flow during the winter with a constant water temperature of about 5 °C are easily accessible for Japanese macaques to search for riverine biota. We used metabarcoding (Cytochrome c oxidase I) of fecal samples from Japanese macaques to determine their wintertime diet. Here we provide the first robust evidence that Japanese macaques feed on freshwater biota, including brown trout, riverine insects and molluscs, in Chubu Sangaku National Park. These additional food sources likely aid their winter survival.


Author(s):  
Ana T. Castro-Castellon ◽  
Alice A. Horton ◽  
Jocelyne M.R. Hughes ◽  
Cordelia Rampley ◽  
Elizabeth S. Jeffers ◽  
...  

2021 ◽  
Vol 224 (20) ◽  
Author(s):  
Sydney Silver ◽  
Andrew Donini

ABSTRACT Salinization of freshwater is occurring throughout the world, affecting freshwater biota that inhabit rivers, streams, ponds, marshes and lakes. There are many freshwater insects, and these animals are important for ecosystem health. These insects have evolved physiological mechanisms to maintain their internal salt and water balance based on a freshwater environment that has comparatively little salt. In these habitats, insects must counter the loss of salts and dilution of their internal body fluids by sequestering salts and excreting water. Most of these insects can tolerate salinization of their habitats to a certain level; however, when exposed to salinization they often exhibit markers of stress and impaired development. An understanding of the physiological mechanisms for controlling salt and water balance in freshwater insects, and how these are affected by salinization, is needed to predict the consequences of salinization for freshwater ecosystems. Recent research in this area has addressed the whole-organism response, but the purpose of this Review is to summarize the effects of salinization on the osmoregulatory physiology of freshwater insects at the molecular to organ level. Research of this type is limited, and pursuing such lines of inquiry will improve our understanding of the effects of salinization on freshwater insects and the ecosystems they inhabit.


Environments ◽  
2021 ◽  
Vol 8 (7) ◽  
pp. 67
Author(s):  
Francesca Salmaso ◽  
Livia Servanzi ◽  
Giuseppe Crosa ◽  
Silvia Quadroni ◽  
Paolo Espa

As the global demand for renewable electricity grows, hydropower development of river basins increases across the world. Hydropeaking, i.e., streamflow alteration consisting of daily or subdaily rapid and marked discharge fluctuations, can affect river reaches below hydropower units. Environmental effects of hydropeaking include geomorphological alterations and possible modifications of the freshwater biota. Among affected instream communities, benthic macroinvertebrates are receiving increasing attention and the related scientific research has experienced significant progress in the last decade. In this context, this paper aims to summarize state-of-the-art methods for the assessment of hydropeaking impacts on benthic macroinvertebrate communities. The present review could support the proper design of monitoring plans aimed at assessing the ecological impacts of hydropeaking and the effects of possible mitigation strategies.


2021 ◽  
Vol 152 ◽  
pp. 106504
Author(s):  
Anna Kukkola ◽  
Stefan Krause ◽  
Iseult Lynch ◽  
Gregory H. Sambrook Smith ◽  
Holly Nel

2021 ◽  
Author(s):  
Benjamin John Gray Moulding

Abstract Freshwater biota are at risk globally from increasing salinity, including increases from deicing salts in cold regions. A variety of metrics of toxicity are used when estimating the toxicity of substances and comparing the toxicity between substances. However, the implications of using different metrics is not widely appreciated. Using the mayfly Colobruscoides giganteus (Ephemeroptera: Colobruscoidea) we compare the toxicity of seven different salts where toxicity was estimated using two metrics 1) the no effect concentrations (NEC) and 2) the lethal concentrations for 10, 25 and 50% of the test populations (LCx). The LCx values were estimated using two different models, the classic log-logistic model and the newer toxicokinetic-toxicodynamic (TKTD) model. We also compare the toxicity of two salts (NaCl and CaCl2) for C. giganteus at water temperatures of 4°C, 7°C and 15°C using the same metrics of toxicity. Our motivation for using a mayfly to assess salinity toxicity was because mayflies are generally salt sensitive, are ecologically important and are common in Australian (sub-)alpine streams. Considering 144-hour LCx values, we found toxicity differed between various salts, i.e., the lowest 144-hour LC50 (8 mS/cm) for a salt used by a ski resort was half that of the highest 144-hour LC50 from artificial marine salts and CaCl2 applied to roads (16mS/cm). 144-hour LC50 results at 7°C showed that analytical grade NaCl was significantly more toxic (7.3mS/cm) compared to analytical grade CaCl2 (12.5mS/cm). Yet for NEC values, there were comparably fewer differences in toxicity between salts and none between the same salts at different temperatures. We conclude that LCx values are better suited to compare difference in toxicity between substances or between the same substance at different test temperatures, while NEC values are better suited to estimating concentrations of substances that have no effect to the test species and endpoint measured under laboratory conditions.


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