Occurrence of macroinvertebrates
in the functional and non-functional basaltic knickzones during the studied period.
Spatial distribution patterns of fish assemblages relative to macroinvertebrates
and environmental conditions in Andean piedmont streams of the Colombian Amazon.
The field work was done during the dry season (February-Abril 2014) for several reasons: i) dry season represents the more stable habitat conditions, ii) the low-flow phase of the river exposes aquatic macroinvertebrates
for sampling, iii) human impacts are enhanced creating spatial variation along the length of the river system, and iv) for comparing to previous studies, because research on river ecology is commonly done during the dry season (Moncayo-Estrada et al., 2015).
Owing to ease in collection due to their large population and body sizes and due to their instant response to soil perturbations, soil macroinvertebrates
have been used as valuable bioindicators of soil quality and environmental sustainability in different land-use systems such as in agro-ecosystems and in semi-natural and natural ecosystems (Blair et al., 1996; Nahmani and Lavelle, 2002; Avgin and Emre, 2010; Rousseau et al., 2013; Wu et al., 2015).
The question of the effects of time, particularly of seasonality and year-to-year variation on a stream's macroinvertebrates
, is a very valid one, but it will have to wait until enough data have been collected.
After identification and enumeration of macroinvertebrates
, we then calculated the diversity index (H), the dominance index (C), the Evenness index (E), the important value index (IVI) of each species, and the Average Score per Taxon (ASPT).
Recently, Rico and van den Brink  developed an approach to assess relative sensitivity of macroinvertebrates
to five different insecticide classes (organophosphates, pyrethroids, carbamates, organochlorines, and neonicotinoids) (Rubach et al.
Editor's Note: Collecting macroinvertebrates
without authorization is against the law.
Response of Stream Macroinvertebrates
to Agricultural Land Cover in a Small Watershed.
Biotic Sampling--We collected a total of 86 distinct taxa of aquatic macroinvertebrates
(Appendix 1), including representatives of the Insecta, Hydracarina, Crustacea, Oligochaeta, Hirudinea, and Gastropoda.
A total of 15,303 macroinvertebrates
were collected from UT and LT between 2003 and 2014.