Biometry of neotropical invertebrates inhabiting floodplain rivers: unravelling bionomy

F. ZILLI,; DEL BARCO JULIA; VANZETTI, A

IHERINGIA. SéRIE ZOOLOGIA

FUNDACAO ZOOBOTANICA RIO GRANDE SUL

Lugar: Porto Alegre; Año: 2017

0073-4721

Currently, it is widely recognized that invertebrates play key roles in neotropical fl oodplains and in many other environments worldwide.However, little information has been published concerning their biometry, in spite that it represents an essential tool for many diff erent studies. Here,we provided length-mass and length-length relationships by fi tting the linearized model (log10 Y = log10a + b log10 X) and several mean biomass ratios ±SE for bivalves, gastropods, quironomids, ephemeropterans, oligochaetes and hirudineans. We measured, weighed, oven dried and incinerated to ashesspecimens collected from 2005 to 2014 in the Paraná River, Argentina. The lineal equations had fi t levels higher than 75% in most of the signifi cantregressions. Hence, when slopes were compared, diff erences raised from ontogeny and phylogeny of taxa. Additionally, slopes resulted diff erent fromconstants of other regions, types of environments and climates. In addition, organic matter ratios resulted signifi cantly diff erent among invertebratesaccording to their feeding types. The equations and ratios that we provided will facilitate future research on life history, productivity and energy transferencein the food webs of invertebrates inhabiting fl oodplain wetlands and can be used as tools for planning management strategies and in restoration projectsof aquatic environments.