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Sur la base d’horloges moléculaires, ces groupes divergents seraient isolés depuis 3 à 5 millions d’années. Nous avons trouvé des populations constituées d’individus fortement divergents (5 % – 11,3 % de divergence nucléotidique intraspécifique) au sein des trois espèces de collemboles, ce qui suggère la possibilité d’une diversité cryptique. Cette région marque aussi la transition entre deux régions biogéographiques (régions septentrionale et méridionale de la terre de Victoria). Afin de mesurer la distribution et la diversité des arthropodes dans la région de la Mer de Ross, nous avons examiné les séquences mitochondriales (COI) chez trois espèces connues de collemboles récoltés à proximité ou encore au nord du glacier Mackay (77°S). Les changements climatiques antérieurs ont vraisemblablement eu des impacts importants sur la distribution et l’abondance du biota terrestre antarctique. Given the currently limited distributions for these genetically divergent populations, any future changes in species’ distributions can be easily tracked through the DNA barcoding of springtails from within the Mackay Glacier ecotone. The reformation of the WAIS would have isolated newly established populations, with subsequent dispersal restricted by glaciers and ice-covered areas. It was during this time that the Western Antarctic Ice Sheet (WAIS) was likely to have completely collapsed, potentially facilitating springtail dispersal via rafting on running waters and open seaways. Based on molecular clock estimates, these divergent lineages are likely to have been isolated for 3–5 million years. We found populations of highly divergent individuals (5%–11.3% intraspecific sequence divergence) for each of the three putative springtail species, suggesting the possibility of cryptic diversity.
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This area acts as a transition between two biogeographic regions (northern and southern Victoria Land). To assess arthropod distribution and diversity within the Ross Sea region, we examined mitochondrial DNA (COI) sequences for three currently recognized species of springtail (Collembola) collected from sites in the vicinity, and to the north of, the Mackay Glacier (77°S). The work that Ecotone does makes the world a better place.Climate changes are likely to have major influences on the distribution and abundance of Antarctic terrestrial biota. Going out into the field to see the restorations in person is so rewarding. Even on a challenging workday I feel a great appreciation to work for a company that is as passionate about nature as I am.
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Along with the dogs, the fun continues with a movie popcorn machine, a hoverboard to ride around, corn hole, chess set, kayaks to borrow, and a wealth of books and reading materials to learn more about a wide range of topics. The presence of friendly dogs in the office brings great joy to fellow dog-lovers. There are many fun company events throughout the year to build stronger relationships between departments. Creativity in improving workflow is encouraged and allows employees to manage their work in a way that best suits their personality. People here work hard, and then celebrate wins together. This is a collaborative environment, where everyone’s opinions matter. I am surrounded by intelligent, enthusiastic, fun-loving, and creative people who support the mission of improving the relationship between humans and nature.