12 research outputs found
El Diario de Pontevedra : periódico liberal: Ano XXVIII Número 8038 - 1911 febreiro 24
<div><p>Arthropods are the most diverse taxonomic group of terrestrial eukaryotes and are sensitive to physical alterations in their environment such as those caused by forestry. With their enormous diversity and physical omnipresence, arthropods could be powerful indicators of the effects of disturbance following forestry. When arthropods have been used to measure the effects of disturbance, the total diversity of some groups is often found to increase following forestry. However, these findings are frequently derived using a coarse taxonomic grain (family or order) to accommodate for various taxonomic impediments (including cryptic diversity and poorly resourced taxonomists). Our intent with this work was to determine the diversity of arthropods in and around Algonquin Park, and how this diversity was influenced by disturbance (in this case, forestry within the past 25 years). We used DNA barcode-derived diversity estimates (Barcode Index Number (BIN) richness) to avoid taxonomic impediments and as a source of genetic information with which we could conduct phylogenetic estimates of diversity (PD). Diversity patterns elucidated with PD are often, but not always congruent with taxonomic estimates–and departures from these expectations can help clarify disturbance effects that are hidden from richness studies alone. We found that BIN richness and PD were greater in disturbed (forested) areas, however when we controlled for the expected relationship between PD and BIN richness, we found that cut sites contained less PD than expected and that this diversity was more phylogenetically clustered than would be predicted by taxonomic richness. While disturbance may cause an evident increase in diversity, this diversity may not reflect the full evolutionary history of the assemblage within that area and thus a subtle effect of disturbance can be found decades following forestry.</p></div
Map of Algonquin Provincial Park within Ontario, and the collection sites (red).
<p>Age categories of cut locations are illustrated here.</p
Café Shapiro Anthology, Selected Poems and Short Stories from the 22nd Annual Café Shapiro
https://deepblue.lib.umich.edu/bitstream/2027.42/149461/1/CafeShapiro2019.pd
Chord diagram that illustrates the phylobetadiversity (site dissimilarity measured phylogenetically as the distance between pairs of species drawn from two sites (comdistnt)).
<p>Cut sites are in brown and uncut sites are in green.</p
Temperature (max, min and average) calculated at each of the six paired locations for three months in 2015.
<p>With one site-pair exception (Achray), cut sites displayed higher average and maximum daily temperatures and also lower daily minimum temperatures. </p
Maximum-likelihood tree of total diversity evident at each of the six paired sites (cut in brown and uncut in green).
<p>BIN richness and total phylogenetic diversity (PD) evident at each site is noted. </p