Assessing acetamiprid and chlorpyrifos pesticide concentrations in water and sediments across macadamia orchard and communal area small reservoirs

Mutshekwa, Thendo; Mugwedi, Lutendo; Moyo, Babra; Madala, Ntakadzeni E.; Wasserman, Ryan; Dondofema, Farai; Dalu, Tatenda

doi:10.1080/02757540.2023.2199015

Cited by 2 publications

(2 citation statements)

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“…Macadamia orchard reservoirs were selected due to their high concentrations of pesticides, whereas communal area reservoirs were selected due to low or absence of pesticide concentrations (Mutshekwa et al, 2023). The macadamia orchard reservoirs were located where they was no housing and were surrounded by macadamia nut plantations (Macadamia integrifolia Maiden & Betche, Macadamia tetraphylla L.A.S.…”

Section: Study Areamentioning

confidence: 99%

“…The pesticides in the macadamia sectors are applied during the flowering season, which typically occurs from late spring to early summer; however, the exact time can vary from year to year due to weather conditions. The communal area reservoirs were located in residential areas and had high levels of human activities along their shorelines, such as irrigated crop and orchard farming, fishing, and other domestic activities (i.e., laundry, swimming, picnics, bathing) and lower pesticide pollution (Mutshekwa et al, 2023). The current study sought to determine the effects of agricultural land use on the occurrence and distribution of macroinvertebrates in macadamia orchard and communal area reservoirs.…”

Section: Introductionmentioning

confidence: 99%

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Aquatic macroinvertebrate community colonisation and succession in macadamia orchard and communal area reservoirs: a case study of Luvuvhu River valley, South Africa

Thendo Mutshekwa,

Lutendo Mugwedi,

Ryan J Wasserman

et al. 2024

WSA

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The demand for macadamia nut production worldwide has led to increased use of pesticides and chemicals for pest and disease control. Reservoirs in these macadamia farming sectors are at . The current study investigated macroinvertebrate colonisation and succession associated with two macadamia orchards and two communal area reservoirs. The potential effects of stressors from these land uses was tested for and compared using stone substrates over a 6-week period. Stone substrates from both reservoir types were abundantly colonised over time and the total macroinvertebrate taxa and abundance showed an increasing trend across the sampled weeks, with macadamia orchards having the highest number of macroinvertebrate taxa. Strong ecological succession was observed across reservoirs, with the initial succession of early colonisers – i.e., Chironominae (, Ostracoda (and Anax sp. (predator) within communal area reservoirs, and Chironominae, Ostracoda Radix natalensis (scrapers) in macadamia orchard reservoirs – followed by predatory colonisers such as Gyrinidae larvae, Trithemis sp. (macadamia orchard reservoirs), and Ranatra sp. (communal area reservoirs). Macroinvertebrate community structure differed significantly across sites and weeks, with no similarity being observed for communities across the different reservoirs. Redundancy analyses further highlighted 11 sediment chemistry variables (i.e., pH, resistivity, P, K, Na, Ca, Mg, Cu, B, Fe and S) which were significantly related to macroinvertebrate community structure. Thus, sediment variables were found to be better predictors of macroinvertebrate community structure in macadamia orchard reservoirs than communal area reservoirs. Consequently, we concluded that differences in colonisation ability among taxa and environmental stressors were important factors driving succession. These results add to the understanding of the macroinvertebrate colonisation processes and environmental stressors within agricultural landscapes, which can aid in the development of conservation management of freshwater ecosystems.

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Section: Study Areamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%