Distribution of the cladoceran Bosmina huaronensis Delachaux, 1918 and niche differentiation among populations from different biogeographic regions

Abstract

-Described from a high-altitude lake in Peru, Bosmina huaronensis Delachaux, 1918 has been recorded in diverse kinds of water bodies in South and North America, suggesting that this species has high environmental tolerance and a wide niche breadth. The present study surveyed the occurrence records of B. huaronensis from 55 localities and, using multivariate analysis, investigated the niche differentiation among populations from different biogeographic regions, based on altitude and seven climatic variables. The first two principal components (PC) explained 73% of the overall variance. PC1 was related to annual mean temperature, precipitation of driest quarter, and annual precipitation. PC2 was related to temperature seasonality and precipitation of wettest quarter. The PCA diagram showed three population groups, occupying different climate niches: (1) tropical highlands; (2) Neotropical lowlands; (3) temperate zones of both hemispheres. These results point to the need for further evaluation of these populations under morphological, genetic and ecological aspects.

Habitat architecture influencing microcrustaceans composition: a case study on freshwater Cladocera (Crustacea Branchiopoda)

“…The species of this family are common widespread planktonic filter feeders (e.g. Melo and Hebert, 1994;Elmoor-Loureiro, 2013) and registers for the studied reservoir has already been provided (Panarelli et al, 2008(Panarelli et al, , 2010Sartori et al, 2009). This habitat architecture is the optimal habitat for planktonic taxa, thus the increased and exclusive number of planktonic species.…”

An update for cladoceran fauna (Crustacea, Branchiopoda) from Lake Paranoá, Central Brazil, with the first description of a male of Leydigiopsis ornata Daday, 1905

“…The morphology of appendages and other structures was studied using an Olympus phase-contrast microscope BX41 attached to a camera lucida. All individuals were identified with the support of taxonomic specialized references (Smirnov, 1996;Elmoor-Loureiro, 1997;Kotov and Štifter, 2006;Sinev and Elmoor-Loureiro, 2010;Sinev, 2004;Van Damme et al, 2011;Van Damme and Sinev, 2013). The voucher specimens were preserved in ethanol and deposited in the personal collection of FDRS (accession numbers FDRS486-495).…”

“…Next, Elmoor-Loureiro (2013) reported Bosmina huaronensis; Sousa et al, (2015a) indicated the occurrence of Coronatella paulinae Sousa, ElmoorLoureiro & Santos, 2015(as C. poppei (Richard, 1897) and Flavalona margipluma (Sousa, Santos, Güntzel, Diniz, Melo-Júnior & Elmoor-Loureiro, 2015) (= Alona margipluma Sousa, Santos, Güntzel, Diniz, Melo-Júnior & Elmoor-Loureiro, 2015in Sousa et al, 2015b. Nevertheless, a higher number of species than are currently known in Lake Paranoá is presumed to exist, because its geographical position is within the distribution range of at least 37 species (Sousa and Elmoor-Loureiro, 2012).…”