Arctiini Leach, [1815] (Lepidoptera, Erebidae, Arctiinae) in a savanna areas of the Environmental Protection Area Alter do Chão, Santarém, Pará, Brazil

The richness and abundance of representatives of Arctiini (Lepidoptera: Erebidae: Arctiinae) was studied considering 88 representative points of savanna in the Alter do Chão Environmental Protection Area (APA), in the municipality of Santarém, state of Pará, Brazil. Moths were sampled monthly from December 2014 to December 2016 (except May 2015), with a light trap, Pennsylvania model, during a new moon night from 6:00 p.m. to 6:00 a.m. the following day. Abundance (N), richness (S) and diversity index (H’), Shannon uniformity (J’) index and Berger-Parker (BP) dominance were analyzed. Wealth estimators “Chao” (1st and 2nd order), “Jackknife” (1st and 2nd order) and “Bootstrap” were also used. A total of 1,375 specimens (N) belonging to 122 species (S) were captured. Idalusmulticolor (Rothschild, 1909) and Pheialateralis Klages, 1906 appear as new records for the Brazilian Amazon. The values for the analyzed parameters were H’= 3.25, J’= 0.67 and BP = 0.33. The estimators and “Bootstrap” (140) and “Jackknife 2nd order” (180) measured that between 14% and 33% of species can still be found, respectively, as shown by the species accumulation curve. The results of this study indicate changes in the faunal composition with an equivalent distribution of species between the Ctenuchina and Phaegopterina subtribes, quite different from anthropized and forested areas that present a predominance of Phaegopterina. In this way, the conservation of savanna fragments present in the APA Alter do Chão contributes to the maintenance of the local fauna and expands the knowledge of Arctiini in the Amazon.