Influence of rice field agrochemicals on the ecological status of a tropical stream

Rasmussen, Jes J.; Reiler, Emilie Marie; Carazo, Elizabeth; Matarrita, Jessie; Muñoz, Alejandro Anaya; Cedergreen, Nina

doi:10.1016/j.scitotenv.2015.10.062

Cited by 26 publications

(16 citation statements)

References 38 publications

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“…The SPEAR pesticides index has not yet been validated for tropical or subtropical streams. A study in tropical streams of Costa Rica did not find a correlation between pesticide toxic units and a modified version of SPEAR (Rasmussen et al 2016). However, that study measured only three sites, and all sites suffered from low dissolved oxygen and lacked sensitive taxa.…”

Section: Relative Importance Of Agricultural Stressorsmentioning

confidence: 88%

Do Riparian Buffers Protect Stream Invertebrate Communities in South American Atlantic Forest Agricultural Areas?

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Marrochi

Bonetto

et al. 2017

Environmental Management

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We investigated the influence and relative importance of insecticides and other agricultural stressors in determining variability in invertebrate communities in small streams in intensive soy-production regions of Brazil and Paraguay. In Paraguay we sampled 17 sites on tributaries of the Pirapó River in the state of Itapúa and in Brazil we sampled 18 sites on tributaries of the San Francisco River in the state of Paraná. The riparian buffer zones generally contained native Atlantic forest remnants and/or introduced tree species at various stages of growth. In Brazil the stream buffer width was negatively correlated with sediment insecticide concentrations and buffer width was found to have moderate importance in mitigating effects on some sensitive taxa such as mayflies. However, in both regions insecticides had low relative importance in explaining variability in invertebrate communities, while various habitat parameters were more important. In Brazil, the percent coverage of soft depositional sediment in streams was the most important agriculture-related explanatory variable, and the overall stream-habitat score was the most important variable in Paraguay streams. Paraguay and Brazil both have laws requiring forested riparian buffers. The ample forested riparian buffer zones typical of streams in these regions are likely to have mitigated the effects of pesticides on stream invertebrate communities. This study provides evidence that riparian buffer regulations in the Atlantic Forest region are protecting stream ecosystems from pesticides and other agricultural stressors. Further studies are needed to determine the minimum buffer widths necessary to achieve optimal protection.

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Section: Relative Importance Of Agricultural Stressorsmentioning

confidence: 88%

Do Riparian Buffers Protect Stream Invertebrate Communities in South American Atlantic Forest Agricultural Areas?

Hunt

Marrochi

Bonetto

et al. 2017

Environmental Management

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“…This is particularly true for undeveloped countries, many of which are located in tropical regions [4]. Tropical forests are declining at unprecedented rates in favour of agriculture [5], and streams flowing through tropical agricultural catchments can be severely impacted [6].…”

Section: Introductionmentioning

confidence: 99%

“…Streams are thus affected by multiple stressors [9,10], all related to agricultural practices, which should be considered together when assessing how agriculture impacts stream communities [11]. Such an approach, however, has rarely been used for the study of streams in the tropics, where information about effects of pesticides is scarce [6] and studies have generally considered the separate effects of nutrient enrichment [12] or altered habitat [13].…”

Section: Introductionmentioning

confidence: 99%

Effects of multiple stressors associated with agriculture on stream macroinvertebrate communities in a tropical catchment

et al. 2019

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Tropical forests are declining at unprecedented rates in favour of agriculture, and streams can be severely impacted due to effects of multiple stressors that have rarely been considered together in tropical studies. We studied the effects of multiple stressors associated with agricultural practices (pesticide toxicity, nutrient enrichment and habitat alteration–quantified as TU max , soluble reactive phosphorus concentration and sedimentation, respectively) on macroinvertebrate communities in a tropical catchment in Panama (13 stream sites sampled in 20 occasions from 2015 to 2017, with 260 samples in total). We examined how macroinvertebrate abundance, taxonomic richness, community composition and biotic indices (SPEAR and BMWP/PAN, which were specifically designed to detect pesticide toxicity and nutrient enrichment, respectively) varied depending on the studied stressors, considering their single and combined effects. Our analyses revealed significant effects of the studied stressors on macroinvertebrate communities, with two particular results that merit further attention: (1) the fact that pesticide toxicity affected BMWP/PAN, but not SPEAR, possibly because the former had been adapted for local fauna; and (2) that most stressors showed antagonistic interactions (i.e., lower combined effects than expected from their individual effects). These results highlight the need for toxicity bioassays with tropical species that allow adaptations of biotic indices, and of observational and manipulative studies exploring the combined effects of multiple stressors on tropical macroinvertebrate communities and ecosystems, in order to predict and manage future anthropogenic impacts on tropical streams.

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“…The addition of excessive chemical fertilizers led to soil toxicities and nutrient imbalance which is a major threat for sustainable production and finally the imbalance of food chain [3]. Humans, as well as livestock, are equally affected by the residues of these agrochemicals in food products [4,5].…”

Section: Introductionmentioning

confidence: 99%

Unveiling the Efficiency of Vermicompost Derived from Different Biowastes on Wheat (Triticum aestivum L.) Plant Growth and Soil Health

et al. 2019

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The present study was conducted to explore the role of different types of vermicomposts (VCs) prepared from different substrates to improve soil health (physical and chemical properties) and wheat plant growth under field conditions. Different combinations of vermicompost prepared from different substrates (cow dung, paper waste, and rice straw) and inorganic fertilizers were applied in soil using wheat as a test plant. The impact of three different VCs on physico-chemical characteristics and nutrient availability in soil was evaluated to examine their efficacy in combination with chemical fertilizers. Temporal trends in vermicomposting treatments at various stages showed significant improvement in physico-chemical attributes of the VCs substrates. All the plant physiological attributes showed significant response where N:P:K 100:50:50 kg ha −1 + 10 t ha −1 cow dung vermicompost was applied. In addition, post-harvest analysis of soil not only revealed that different combinations of the vermicomposting treatments improved the soil health by improving the physico-chemical attributes of the soil. Conclusively, application of cow dung vermicompost along with recommended NPK not only improved crop yield, soil health, reduced insect (aphid) infestation but also fortified grains with Zn and Fe. Funding acquisition, Z.A., S.B. and M.M.; Investigation, Z.A. and W.H.; Methodology, N.A., N.K.N. and M.I.K.; Resources, M.M.; Supervision, K.B. and Z.C.; Validation, N.A. and N.K.N.; Writing-original draft, S.B.; Writing-review & editing, K.B., Z.C. and M.M.

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Influence of rice field agrochemicals on the ecological status of a tropical stream

Cited by 26 publications

References 38 publications

Do Riparian Buffers Protect Stream Invertebrate Communities in South American Atlantic Forest Agricultural Areas?

Do Riparian Buffers Protect Stream Invertebrate Communities in South American Atlantic Forest Agricultural Areas?

Effects of multiple stressors associated with agriculture on stream macroinvertebrate communities in a tropical catchment

Unveiling the Efficiency of Vermicompost Derived from Different Biowastes on Wheat (Triticum aestivum L.) Plant Growth and Soil Health

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