Distributional patterns of the Neotropical and Andean species of the genus Bombus (Hymenoptera: Apidae) (original) (raw)
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Track analysis reveals the composite nature of the Andean biota
The Andean subregion corresponds to south-western South America below 30°S latitude, extending through the Andean highlands north of this latitude, and comprises five provinces: Subantarctic, Central Chilean, Patagonian, Puna and Paramo. Based on a track analysis of the Andean biota, three main types of distributions were found: (1) no relationship of the Andean subregion with other areas (Andean endemic distributions); (2) relationships with one area or subregion, namely (a) Austral, (b) Tropical and (c) Amphitropical distributions; and (3) relationships with more than one subregion (cosmopolitan distributions). These relationships were described and mapped as individual tracks, based on data from plant and animal taxa. Coinciding individual tracks constitute generalised tracks, which follow three basic patterns: Andean endemic, Austral and Tropical. The first pattern is represented by three generalised tracks, namely (a) along the Puna, Central Chilean, Subantarctic and Patagonian provinces; (b) along the Central Chilean, Patagonian and Subantarctic provinces; and (c) in the Subantarctic and Patagonian provinces. The second pattern (Austral) is represented by two generalised tracks: (a) along the Subantarctic province of South America, south-eastern Australia, and New Zealand and (b) along the Subantarctic province and New Zealand. The third pattern (Tropical) is based on three generalised tracks joining (a) all the Andean subregion with the Neotropical subregion; (b) Paramo and Puna provinces, and the Neotropical subregion; and (c) Patagonian province and Neotropical subregion. The Austral pattern reflects the existence of an ancient Austral biota, with Gondwana events likely to have played a major role in its evolution, whereas the origin of the Neotropical pattern is probably linked to a more recent history, especially the uplift of the Andes and further glaciations. Both of these patterns reveal that the biota of the Andean subregion has a complex or hybrid origin where two different ancestral biological and geological worlds met and combined. The Puna, Patagonian, and Subantarctic provinces appear as panbiogeographic nodes, because of the numerous tracks that cross them, probably due to complex geological events. It is possible that the patterns analysed are the consequence not only of vicariant events promoted by tectonic phenomena, but also of dispersal and/or extinctions that have concealed these events.
Annales de la Société Entomologique de France, 2009
The Invertebrate section of the Museum of Zoology QCAZ at the Pontifi cal Catholic University of Ecuador in Quito maintains nearly two million curated specimens, and comprises Ecuador´s largest collection of native taxa. We review 1902 type specimens from 6 subspecies and 320 species in 121 genera and 42 families, currently kept in the Museum. The list includes 116 holotypes, 10 allotypes, 1774 paratypes and 2 neoparatypes. The collection of type specimens is particularly strong in the Coleoptera (family Carabidae and Staphylinidae) and Hymenoptera. However, other insect orders such as Diptera and Lepidoptera and non-insect arthropods such as Acari, Aranea and Scorpiones, are moderately represented in the collection. This report provides original data from labels of every type specimen record. An analysis of the geographic distribution of type localities showed that collection sites are clustered geographically with most of them found towards the northern region of Ecuador, in Pichincha, Cotopaxi and Napo provinces. Sites are mainly located in highly accessible areas near highways and towns. Localities with a high number of type species include the cloud forest reserve Bosque Integral Otonga and Parque Nacional Yasuní in the Amazon rainforest near PUCE's Yasuní Scientifi c Station. Type localities are not well represented in the Ecuadorian National System of Protected Areas. Future fi eldwork should include localities in the southern region of Ecuador but also target less accessible areas not located near highways or towns. We discuss the value of the collection as a source of information for conservation and biodiversity policies in Ecuador.
Chilean Darwin Wasps (Ichneumonidae): Biogeographic Relationships and Distribution Patterns
Insects, 2024
Ichneumonidae, or Chilean Darwin wasps, are an important component of South American hymenopteran diversity, but the taxonomic and distributional knowledge on this insect is still deficient. Taking advantage of recently updated taxonomic knowledge, we assessed biogeographic relationships at the genus level and biodiversity spatial patterns along the latitudinal gradient. The results show the presence of 264 species in Chile, arranged in 102 genera and 22 subfamilies. Biogeographic relationships are based on six elements (cosmopolitan (n = 50; 36%), endemic (n = 29; 21%), Neotropical (n = 22; 16%), Holarctic–Oriental (n = 19; 14%), south-temperate (n = 16; 11%) and Australasian) and composed of just three genera: Anacis, Labena, and Meringops. Species and genera show a bimodal distribution along the latitudinal gradient: around 34◦ and 38◦ S. From an ecoregional perspective, richness is concentrated in the Valdivian temperate forests, but when assessed at a 0.5 × 0.5 cell scale, several outstanding cells are in the contact zone between the temperate forests and the Chilean Matorral. On the other hand, the Atacama Desert shows little or no presence of Darwin wasps. The results agree with Charles Porter, who identified a northern province composed of Neotropical and cosmopolitan genera with their own representatives in the far north (11 genera), a distributional gap in the core of the Atacama Desert, and around 128 genera in Porter’s Neantarctic realm, covering all of Chile from 25◦ S to Cape Horn, including the Juan Fernandez islands. These results reinforce knowledge gaps and the need for more sampling and studies of available collections. Due to sampling gaps at this stage, identifying a continued increase or decrease in richness towards higher latitudes is not possible. More taxonomic and distributional information is also needed to assess potential threats to endemic genera and species.
The Neotropical region is the most biodiverse on Earth, in a large part due to the highly diverse tropical Andean biota. The Andes are a potentially important driver of diversification within the mountains and for neighboring regions. We compared the role of the Andes in diversification among three subtribes of Ithomiini butterflies endemic to the Neotropics, Dircennina, Oleriina, and Godyridina. The diversification patterns of Godyridina have been studied previously. Here, we generate the first time-calibrated phylogeny for the largest ithomiine subtribe, Dircennina, and we reanalyze a published phylogeny of Oleriina to test different biogeographic scenarios involving the Andes within an identical framework. We found common diversification patterns across the three subtribes, as well as major differences. In Dircennina and Oleriina, our results reveal a congruent pattern of diversification related to the Andes with an Andean origin, which contrasts with the Amazonian origin and multiple Andean colonizations of Godyridina. In each of the three subtribes, a clade diversified in the Northern Andes at a faster rate. Diversification within Amazonia occurred in Oleriina and Godyridina, while virtually no speciation occurred in Dircennina in this region. Dircennina was therefore characterized by higher diversification rates within the Andes compared to non-Andean regions, while in Oleriina and Godyridina, we found no difference between these regions. Our results and discussion highlight the importance of comparative approaches in biogeographic studies. knowledges support from the FAPESP (BIOTA-FAPESP 2011/50225-3); from Brazilian Research Council-CNPq (grants 302585/2011-7, 303834/2015-3, and SISBIOTA-Brasil/CNPq -563332/2010-7); from two collaborative grants of "
Journal of Biogeography, 2007
Aim We analysed the geographical distribution of beetle species of the families Buprestidae, Cerambycidae, Dryophthoridae, Melolonthidae, Passalidae and Staphylinidae from the Trans-mexican Volcanic Belt (TVB) through a track analysis and a parsimony analysis of endemicity (PAE), in order to test its naturalness and determine its affinities. Location The area analysed corresponds to the TVB, which is a biogeographical province of the Mexican Transition Zone. Methods The panbiogeographical analysis was based on the comparison of the individual tracks of 299 species of Buprestidae, Cerambycidae, Dryophthoridae, Melolonthidae, Passalidae and Staphylinidae (Coleoptera). The TVB was divided into 1 o • 1 o grid cells and we also included in the analysis the remaining Mexican biogeographical provinces. Parsimony analysis of endemicity with progressive character elimination (PAE-PCE) was applied to classify areas by their shared taxa according to the most parsimonious cladograms. The nested sets of areas were represented as generalized tracks. Results Three generalized tracks were obtained: (1) grid cells 9C,