geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Paleolimnological evidence of terrestrial and lacustrine environmental change in response to European settlement of the Red River Valley, Manitoba and North Dakota


, : Paleolimnological evidence of terrestrial and lacustrine environmental change in response to European settlement of the Red River Valley, Manitoba and North Dakota. Geographie Physique et Quaternaire 59(2-3): 263-275

Limnological and terrestrial changes in three floodplain lakes are correlated with settlement of the Red River valley in Manitoba and North Dakota. Distinctive pollen, diatom and thecamoebian assemblages provide proxy evidence of the ecological changes from pre- to post-settlement periods in Horseshoe Lake, Lake Louise and Salt Lake. In the pre-settlement period (Zone I), prior to approximately 1812, grass and Quercus pollen dominate and are indicative of a tall grass prairie-oak riparian forest ecosystem. Diatom and thecamoebian assemblages suggest oligo- to mesotrophic limnological conditions, and more brackish water than presently occurs in Horseshoe Lake. The onset of the post-settlement period (Zone II) corresponds to distinctive terrestrial and limnological changes. A sharp decline in Quercus at the base of this zone correlates with documented regional riparian deforestation, whereas the increase in the weed taxa Salsola, Brassica, Rumex and Ambrosia is associated with the introduction of European agricultural practices and cereal grasses. Diatom and thecamoebian assemblages indicate progressive flood-plain lake eutrophication, as well as increased salinity in Salt Lake. Salt Lake is the most brackish lake and supports the brackish-water foraminifera Trochammina macrescens cf. polystoma. Increased erosion and run off in the watershed has caused a more than twofold increase in lake basin sedimentation between the pre-settlement and post-settlement periods.

US$29.90


Other references

Asahi, T.; Taira, T.; Ikeda, K.; Yamamoto, J.; Sato, S., 2017: Improvement of Table Tennis Dystonia by Stereotactic Ventro-Oral Thalamotomy: A Case Report. Task-specific focal dystonia, such as writer's cramp and musician's cramp, is a type of dystonia that affects performance of particular tasks. Such movement disorders have been treated with stereotactic ventro-oral (Vo) thalamotomy with...

Wharton, G.W., 1945: Two new species of Acariscus: A. pluvius and A. anous (Acarinida: Trombiculidae). Journal of Parasitology 31: 401-405

Peachey, T.; Eason, J.; Moxham, J.; Jarvis, D.; Driver, M., 1988: Systemic air embolism during laser bronchoscopy. We report a case of massive, fatal, systemic gas embolism which occurred during the course of laser bronchoscopic resection of a bronchial carcinoma. The clinical features of systemic air embolism are discussed.

Meyer, E.; Wurtz, B., 1968: Studies on the mechanism of oxidations in Pseudomonas fluorescens. V. Modalities of the reduction of cytochrome c. Comptes Rendus des Seances de la Societe de Biologie et de Ses Filiales 162(1): 275-279

Fujiwara, M.; Takahashi, K.; Kawashima, S., 1968: Clinical experience with 10mg Parotin tablets. Horumon to Rinsho. Clinical Endocrinology 16(4): 313-314

Halmø Hürdum, S.; Zhang, G.; Khoo, S-Kim.; Bizzintino, J.; Franks, K.Marie.; Lindsay, K.; Keil, A.David.; Cox, D.William.; Goldblatt, J.; Bochkov, Y.Alexandrovich.; Gern, J.; Ulrik, C.Suppli.; Souëf, P.Neils.Le.; Laing, I.Alisa., 2015: Recurrent rhinovirus detections in children following a rhinovirus-induced wheezing exacerbation: A retrospective study. It is unclear if children with a rhinovirus (RV)-induced wheezing exacerbation are more susceptible to viruses longitudinally, and whether a parental history of asthma and/or allergy impacts their susceptibility. The objective of this study was to...

Zhou, H.; Yang, W-Shuang.; Li, Y.; Ren, T.; Peng, L.; Guo, H.; Liu, J-Feng.; Zhou, Y.; Zhao, Y.; Yang, L-Chao.; Jin, X., 2016: Oleoylethanolamide attenuates apoptosis by inhibiting the TLR4/NF-κB and ERK1/2 signaling pathways in mice with acute ischemic stroke. NlmCategory="UNASSIGNED">This study was carried out to investigate the exact mechanisms behind the neuroprotective effects of oleoylethanolamide (OEA) after acute cerebral ischemic injury. Transient focal cerebral ischemia was induced...

Sakamoto, Y.; Watanabe, H.; Tano, Y., 1999: Beta1,3N-acetylglucosaminyltransferase involving keratan sulfate biosynthesis in developing embryonic chicken corneas. IOVS 40(4): S624, March 15

Strübel, G.; Hüttemann, R.W.; Rzepka-Glinder, V.; Winges, W.; Kühn, U., 1989: Composition and properties of calculus under specific and job-specific viewpoints. Resulting from phase-analytical and chemical examinations there are characteristically habitual differences in the consistency of dental calculus. Very obvious are sex (gender) specific and job specific differences concerning the contents of heavy...

Tsirlis, T.D.; Papastratis, G.; Masselou, K.; Tsigris, C.; Papachristodoulou, A.; Kostakis, A.; Nikiteas, N.I., 2008: Circulating lymphangiogenic growth factors in gastrointestinal solid tumors, could they be of any clinical significance?. Metastasis is the principal cause of cancer mortality, with the lymphatic system being the first route of tumor dissemination. The glycoproteins VEGF-C and VEGF-D are members of the vascular endothelial growth factor (VEGF) family, whose role has...