Neotropical Entomology

, Volume 48, Issue 2, pp 186–196 | Cite as

Environmental Thresholds of Nepomorpha in Cerrado Streams, Brazilian Savannah

  • N. F. S. Giehl
  • L. S. BrasilEmail author
  • K. Dias-Silva
  • D. S. Nogueira
  • H. S. R. Cabette
Ecology, Behavior and Bionomics


Determining thresholds of species loss in response to gradients of human impact is becoming an increasingly important component of stream conservation and management. We analyzed the thresholds of change in populations and communities of the infraorder Nepomorpha along a gradient of environmental integrity in streams of the Brazilian savannah, based on samples from 20 sites. We used the Threshold Indicator Taxa Analysis (TITAN) to identify the location and magnitude of changes associated with the environmental quality and the frequency and abundance of the different taxa. We also used TITAN to calculate the positive and negative thresholds of the community and species along the habitat integrity gradient. Nepomorphan species were generally associated with sites of higher environmental quality, which presented larger populations and greater species richness. Only a few nepomorphan species groups were associated with impacted streams. Thresholds were evident in some aquatic nepomorphan populations, but not for the community as a whole. This indicates that species have idiosyncratic responses to the environmental gradient, but in general nepomorphans appear to be a good indicator of healthy environments or less impacted streams in the Brazilian savannah.


Aquatic bugs, biomonitoring, conservation, environmental gradient, biological indicators 



We thank CAPES for the N.F.S. Giehl doctoral stipend. L.S. Brasil is thankful for the post-doctorate grant of the PNPD-CAPES linked to the PPG in Zoology (UFPA and MPEG); D.S. Nogueira and K. Dias-Silva for the post-doctorate grant of the CAPES; FAPEMAT (no. 98/04), CAPES–PROAP, and PROCAD (no. 109/2007) for the financial support and PELD/CNPq (no. 403725/2012-7 and 385588/2014-3) for Technology Development and Industrial stipend to N.F.S. Giehl; and PPG in Ecology and Conservation and Entomology Laboratory (UNEMAT-NX) for the logistic support. We thank A.L. Melo (UFMG), J.R.I. Ribeiro (UNIPAMPA), and H.D.D. Rodrigues (USP) for confirming some species identities. We also thank the reviewers for the valuable corrections and suggestions.

Supplementary material

13744_2018_632_MOESM1_ESM.docx (22 kb)
Supplementary 1 Habitat Integrity Index, adapted by Cabette et al. (unpublished). (DOCX 21 kb)
13744_2018_632_Fig5_ESM.png (168 kb)
Supplementary 2

Relative abundance and occurrence of nepomorphan species in lotic environments in Mato Grosso, central Brazil. (PNG 168 kb)

13744_2018_632_MOESM2_ESM.tif (15 kb)
High Resolution Image (TIF 14 kb)
13744_2018_632_Fig6_ESM.png (475 kb)
Supplementary 3

Distribution and abundance of nepomorphans ranked by the Environmental Integrity Gradient in lotic environments in Mato Grosso, central Brazil. (PNG 475 kb)

13744_2018_632_MOESM3_ESM.tif (154 kb)
High Resolution Image (TIF 154 kb)
13744_2018_632_Fig7_ESM.png (145 kb)
Supplementary 4

Maximum change points of the taxa along the gradient of environmental quality, in the lotic environments of Mato Grosso, central Brazil. [A and B = axes 1 and 2 of the PCA plotted with the 12 HII questions and the NDVI, C and D = the PCA axes plotted with the HII, NDVI and limnological data]. The black symbols represent species associated with less pristine environments (z-) and the white symbols, those associated with more pristine environments (z+). The horizontal lines indicate the 95% quartile around the change point. (PNG 145 kb)

13744_2018_632_MOESM4_ESM.tif (46 kb)
High Resolution Image (TIF 46 kb)
13744_2018_632_Fig8_ESM.png (111 kb)

(PNG 111 kb)

13744_2018_632_MOESM5_ESM.tif (41 kb)
High Resolution Image (TIF 41 kb)
13744_2018_632_Fig9_ESM.png (145 kb)

(PNG 144 kb)

13744_2018_632_MOESM6_ESM.tif (46 kb)
High Resolution Image (TIF 46 kb)
13744_2018_632_Fig10_ESM.png (107 kb)

(PNG 107 kb)

13744_2018_632_MOESM7_ESM.tif (41 kb)
High Resolution Image (TIF 40 kb)


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Copyright information

© Sociedade Entomológica do Brasil 2018

Authors and Affiliations

  • N. F. S. Giehl
    • 1
  • L. S. Brasil
    • 2
    Email author
  • K. Dias-Silva
    • 3
  • D. S. Nogueira
    • 4
  • H. S. R. Cabette
    • 1
  1. 1.Programa de Pós-Graduação em Ecologia e ConservaçãoUniv do Estado de Mato GrossoNova XavantinaBrasil
  2. 2.Programa de Pós-Graduação em ZoologiaUniv Federal do Pará e Museu Paraense Emílio GoeldiBelémBrasil
  3. 3.Programa de Pós-Graduação em Biodiversidade e ConservaçãoUniv Federal do ParáAltamiraBrasil
  4. 4.Instituto Federal de Mato GrossoAlta FlorestaBrasil

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