Partnership to high altitude, and Cricotopus sp. 1, Cricotopus sp. two, Dicrotendipes sp. two, and Thienemanniella sp. two to low altitude. Discussion The slight variations within the abiotic factors analyzed at the websites have been possibly resulting from the environmental similarities between the internet sites. The dissolved oxygen levels have been somewhat higher on account of the place in mountain locations. The pH from the JacuRiver is slightly acidic (Siegloch et al. 2008; FEPAM 2010).As a result, the highest values of rainfall recorded in February and May 2002 correlated using the highest values of depth and velocity measured through these months. Conversely, the low value of rainfall recorded in August 2002 led for the lower water velocity within this month. The higher month-to-month imply air temperatures recorded in November 2001 and February 2002 correlated with all the highest values of air and water temperatures at the sampling web-sites. On the other hand, the low month-to-month mean temperature recorded in August 2001 may have led PubMed ID:http://www.ncbi.nlm.nih.gov/pubmed/20142848 to the high worth of dissolved oxygen through this month. An inverse relationship between temperature and dissolved oxygen is recorded in the literature (Ali et al. 2002). On the other hand, the low worth of dissolved oxygen recorded in Might 2002, which also showed a low monthly imply temperature, might have been compensated by the greater rainfall, a partnership discussed in other studies (Pinder 1986; Agostinho et al. 2009). The richness (69) recorded inside the middle JacuRiver basin is amongst the highest recorded in Brazil. In actual fact, an inventory carried out by the senior author within this watershed (Floss et al. 2012), employing a wide temporal and KRIBB11 site spatial scale of sampling, recorded 99 taxa. Equivalent richness was located in Brazil, only in studies carried out more than wider temporal (71 taxa in a 12-month study; Siqueira et al. 2008) and/or spatial (51 taxa in nine smaller rivers; Corbi and TrivinhoStrixino 2008) scales. The higher all round richness in this area agrees using the tendencyFloss et al.of riverine chironomid larvae assemblages to show higher richness in temperate regions than in tropical regions (McKie et al. 2005; Raunio 2008; Floss et al. 2012). Having said that, the reasonably high richness recorded within this study may well be related to the slope-plain transition from the area, at the same time as towards the gravelly substrate on the streams, as discussed by Floss et al. (2012). Transition zones occasionally show greater richness due to the fact species of mountainous and high-altitude areas could be found with each other with species of potamic regions (Principe et al. 2008). Many of those species are uncommon simply because they live close to their ecological limits (Statzner and Higler 1986). In the study region, the rarity of many taxa was notable and corroborates this assumption. Gravelly substrates also contribute to high richness since they promote habitat heterogeneity, favoring the occurrence of diverse macroinvertebrate (Cogerino et al. 1995; Beisel et al. 2000; Voelz and Mcarthur 2000; Principe and Corigliano 2006) and chironomid (Lindergaard 1995a; Lencioni and Rossaro 2005) faunas. The dominant taxa within the location (Rheotanytarsus sp. 1, Cricotopus sp. two, Rheotanytarsus sp. 2, Polypedilum (Polypedilum) sp. 2), and/or these that occurred at all sampling sites (Polypedilum (Polypedilum) sp. 1, Thienemanniella sp. 1, and Lopescladius) are represented by genera characteristic of lotic environments using a gravel bottom, litter and fine sediment deposition, and riparian and aquatic vegetation (Sanseverino and Nessimian 2001; Rosa et al. 2011). These cha.
