Biodiversity of the Rewa Head B Zoological Society of London ...

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Table 1. Species diversity and relative abundance index of mammals recorded in the camera traps. Common Name Latin Name Number of firings Estimated number of individuals Relative Abundance (%) Red-rumped Agouti Dasyprocta cristata 42 28 25.2 Paca Agouti paca 18 17 15.3 Green Acouchy Myoprocta exilis 27 15 13.5 Collared Peccary Tayassu tajacu 2 9 8.1 Brazilian Tapir Tapirus terrestris 9 9 8.1 Nine-banded Long-nosed Armadillo Dasypus novemcinctus 9 9 8.1 Red Brocket Deer Mazama americana 4 4 3.6 Ocelot Leopardus pardalis 4 4 3.6 Common Grey Four-eyed Oppossom Philander opossum 3 3 2.7 Common Oppossom Didelphis marsupialis 2 2 1.8 Jaguarundi Puma yagouaroundi 2 2 1.8 Margay Leopardus wiedi 2 2 1.8 Puma Puma concolor 2 2 1.8 Spiny Rat sp Proechimys sp 2 2 1.8 Guianan Squirrel Sciurus aestuans 1 1 0.9 Giant Anteater Myrmecophaga tridactyla 1 1 0.9 Tayra Eira barbara 1 1 0.9 17 131 111 100 Discussion The frequency of triggerings were not evenly distributed throughout the line of traps, but it appeared that several traps were set up in areas that were ‘dead ground’ with the worst site (3.1) only firing three times, with only one triggering event yielding species identification shots, while others were in ‘hot spots’. Traps 4.2 and 6.1 proved the most successful, both recording 11 species from 30 and 39 triggering events respectively. Trap 4.2 was actually set up on a hill, 150m from the river’s edge and proved to be an extremely successful spot. All traps except one continued to work well despite the torrential downpours and high humidity experienced during the expedition, battery power was between 60-80% when the traps were recovered after 22 days and the 2GB CF cards were between 1-40% full. To a certain extent, the lack of triggerings made in the poorer sites might reflect inaccurate set up. Judging the exact angle at which to point the trap in order to both capture small rodents passing in the foreground and anything passing in the background was not always successful. We recommend using a laser pen for setting up as this can help to achieve the perfect angle. While the company Moultrie have a camera trap on the market with this function built in, the lack of the ability to have constant firing function, coupled with a slower wake-up time meant we rejected that model for this study. There appeared to be no difference in species capture success depending on the placement of camera traps whether at the river’s edge, or set 150m inland. The bank traps captured a total of 17 species in 79 triggerings, whereas the inland traps captured 19 species in 91 triggerings. Four species were exclusively caught in the river edge traps (Guianan squirrel (Sciurus aestuans), ocelot (Leoprardus pardalis), puma (Puma concolor), and jungle runner (Ameiva ameiva) whereas 6 were caught only by the inland traps (red brocket deer (Mazama americana), giant anteater (Myrmecophaga tridactyla), tayra (Eira barbara), margay (Leopardus weidii), common opossum (Didelphis marsupialis) and grey-winged trumpeter (Psophia crepitans)). One reason for setting up the traps in a paired string was to test the hypothesis that felids follow watercourses and so will be more likely to be captured near to the river bank. While our data are not numerous enough to make meaningful statements, out of the 10 cats photographed, 7 of them were captured by the river’s edge traps. Biodiversity of the Rewa Head 15
Figure 12. Male puma (Puma concolor) filmed captured following a female (tail just visible on far right). Figure 14. Inquisitive female Brazilian tapir (Tapirus terrestris). Figure 16. Rainforest dwelling giant anteater (Mymecophaga tridactyla). 16 Biodiversity of the Rewa Head Figure 13. Herd of collared Peccary (Tayassu tajacu). Figure 15. Tayra (Eira Barbara). Figure 17. Margay (Leopardus wiedii). Figure 18. Ocelot (Leopardus pardalis). Figure 19. Jaguarundi (Puma yagouaroundi).
Page 1 and 2: Zoological Society of London, Regen
Page 3: Published by: The Zoological Societ
Page 8 and 9: Co n t e n t s Executive Summary 3
Page 10 and 11: ex e C u t i v e su m m a r y The r
Page 12 and 13: te a m Rob Pickles. BSc Zoology Rob
Page 14 and 15: Unlike its larger neighbour to the
Page 16 and 17: The first outsiders to begin exploi
Page 18 and 19: Chapter 1. Mammalian Species Divers
Page 20 and 21: Method In surveying the Rewa for si
Page 24 and 25: The data reveal a typical situation
Page 26 and 27: Figure 22. Pale-throated three-toed
Page 28 and 29: Figure 24. A White-plumed Antbird (
Page 30 and 31: with the Smithsonian’s gives a mo
Page 32 and 33: Figure 34. Yellow-footed tortoise (
Page 34 and 35: ecorded claim boards over 20 river
Page 36 and 37: Figure 37. The area leased to Groun
Page 38 and 39: Chapter 5. Conservation value of th
Page 40 and 41: Figure 39. A relict leviathan, the
Page 42 and 43: Groenendijk J, Hajek F, Duplaix N,
Page 44 and 45: ap p e n d i x i Mammalian Diversit
Page 46 and 47: ap p e n d i x ii Avian Diversity a
Page 48 and 49: Scarlet Macaw Ara macao F U S Golde
Page 50 and 51: Amazonian Barred Woodcreeper Dendro
Page 52 and 53: Capuchinbird Perissocephalus tricol
Page 54 and 55: ap p e n d i x iii Reptilian Divers
Page 56: Biodiversity of the Rewa Head 49

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