Based on these advantages, functional and phylogenetic diversity metrics have potential to be useful for aquatic biomonitoring programs (Vandewalle et al., 2010). In this sense, we asked if multi metric indices should include these new metrics to properly monitor several facets of biodiversity. Although there is information about many functional traits of aquatic macroinvertebrates from the Northern hemisphere (Dole´dec et al., 1999; Poff et al., 2006; Dole´dec & Statzner, 2010) and some from tropical environments (Tomanova et al., 2006; Colzani et al., 2013), we selected only four traits—voltinism, refuge building, respiration, and trophic groups (see Appendix 1 inSupplementary Material)—for two reasons. First, because these traits can be considered response traits—traits filtered by the environment that represent organism fitness in that environment (Violle et al., 2007). Second, because simplicity is one of the mostdesirable characteristic of biomonitoring tools (Bonada et al., 2006). We chose voltinism because we expected that impacted streams would have mainly multivoltine species—fast life cycle and less dependency on stable environments, whereas pristine streams would have both, multivoltine, and univoltine species—slower life cycle and higher dependency on stable environments to maintain populations (Weiher, 2011). We expected that impacted streams would have mainly species with aerial respiration because of low levels of dissolved oxygen in the water, whereas pristine streams would have species with cutaneous and gill respiration (Dole´dec et al., 2006)
đang được dịch, vui lòng đợi..