Ground-dwelling invertebrates from an Urban park in the Brazilian Amazon, with particular reference to Phlebotominae (Diptera: Psychodidae)

The ground-dwelling invertebrate fauna from an urban park in Belém, Amazonian Brazil, with particular reference to the subfamily Phlebotominae (Diptera: Psychodidae), were characterized. Sampling was performed from March 2022 to May 2023, with 10 emergence traps installed in 2 microhabitats, 5 in each 1: “M1,” which included surrounding (up to 1.5 m) trees with tabular roots, and “M2,” which included no trees with tabular roots. Invertebrates trapped in adhesive papers were assessed on 2 occasions/cycles (D21/D42). During 10 sampling cycles (10 traps/cycle = 100 samples), 6,490 invertebrates were captured (M1, n= 4,203; M2, n= 2,287) and classified into 5 classes and 21 orders, with Diptera (n= 2,309; 35.6%) being the most abundant. Twenty-nine specimens of the following phlebotomine species were captured: Nyssomyia antunesi(M1, n= 10; M2, n= 3), Trichophoromyia ubiquitalis (M1, n= 6; M2, n= 1), Th. brachipyga(M1, n= 0; M2, n= 2), Bichromomyia flaviscutellata(M1, n= 2; M2, n= 1) and 4 unidentified specimens (M1, n= 2; M2, n= 2). The male/female ratio was 1.08. Fractional vegetation cover was compared, and the physiochemical characteristics of the soil were compared between the microhabitats. Only temperature showed significant differences. A weak positive correlation was found between phlebotomines and other dipterans and between temperature and the amount of organic matter in the soil. Both sampled microhabitats were shown to be suitable for the development and maintenance of different invertebrates, mainly dipterans. The composition of ground-emerging phlebotomine species was similar to that previously surveyed with light traps, including species associated with the transmission of Leishmaniaspp.