Year-to-year variability of epifaunal assemblages on a mobile hard substrate-Case study from high latitudes

2018 ◽  
Vol 39 (6) ◽  
pp. e12533
Author(s):  
Piotr Balazy ◽  
Piotr Kuklinski
Keyword(s):  
Hard Substrate ◽  
High Latitudes ◽  
Epifaunal Assemblages

scholarly journals Near-daily discharge estimation in high latitudes from Sentinel-1 and 2: A case study for the Icelandic Þjórsá river

2020 ◽  
Vol 241 ◽  
pp. 111684 ◽  
Author(s):  
Joost Brombacher ◽  
Johannes Reiche ◽  
Roel Dijksma ◽  
Adriaan J. Teuling
Keyword(s):  
High Latitudes ◽  
Daily Discharge ◽  
Discharge Estimation

scholarly journals <i>Bolboforma</i> (Phytoplankton Incertae Sedis), <i>Bachmayerella</i> and other Calciodinelloidea (Phytoplankton) from the Middle Miocene of the Alpine–Carpathian Foredeep (Central Paratethys)

2004 ◽  
Vol 23 (2) ◽  
pp. 139-152 ◽  
Author(s):  
Silvia Spezzaferri ◽  
Fred Rögl
Keyword(s):  
Middle Miocene ◽  
Planktonic Foraminifera ◽  
High Latitudes ◽  
Calcareous Nannofossils ◽  
Geological Time ◽  
Incertae Sedis ◽  
Sedimentary Sequences ◽  
Unicellular Organisms ◽  
First Time

Abstract. Bolboforma is a microfossil of uncertain origin with affinities to protophytic algae. It generally occurs at high latitudes and/or in cool and temperate waters and has a high stratigraphic potential especially for the Miocene. Calcareous cysts of dinoflagellates represent the ‘benthic cyst stage’ of unicellular organisms belonging to the marine phytoplankton.The occurrence of Bolboforma, Bachmayerella is documented here and, for the first time, some calcareous cysts of dinoflagellates tentatively attributed to Alasphaera and Pithonella from Badenian (Langhian–Middle Miocene) sediments in Austrian and Moravian localities. Alasphaera and Pithonella were previously described from Cretaceous and Danian sediments only, therefore, their range has been extended into the Paratethyan Middle Miocene.Correlation of Bolboforma bioevents with standard geological time-scales allows confirmation, and in some cases refinement, of age assignments based on other microfossil groups, such as foraminifera and calcareous nannofossils, in Paratethyan areas. In particular, this paper presents a case study of the biostratigraphy of the Grund Formation outcropping at its type locality in Lower Austria. Age attribution of the Grund Formation has been uncertain for some time. The recovery of Praeorbulina glomerosa circularis and Uvigerina macrocarinata, associated with Bolboforma reticulata, allows the correlation of the Grund Formation with the Early Badenian (Middle Miocene). As planktonic foraminifera are generally very rare or absent in shelf deposits of many other Austrian and Moravian Middle Miocene sedimentary sequences, Bolboforma, and in particular B. reticulata, remains an important biomarker to identify lower Badenian sediments.Additionally, the new species Bolboforma gneixendorfensis Spezzaferri &amp; Rögl is described. It is generally double-chambered with a weakly reticulate wall texture and is associated with Bolboforma reticulata, B. bireticulata and/or B. moravica.

scholarly journals Reflecting on the status of precipitation data collection in Alaska: a case study

2014 ◽  
Vol 46 (4) ◽  
pp. 478-493 ◽  
Author(s):  
Douglas L. Kane ◽  
Svetlana L. Stuefer
Keyword(s):  
Data Collection ◽  
Precipitation Data ◽  
High Latitudes ◽  
Measured Variable ◽  
Solid Precipitation ◽  
Spatial Coverage ◽  
The Status ◽  
Intensity Duration Frequency ◽  
Precipitation Network

Measuring precipitation, especially solid, at high latitudes is a challenge. In Alaska (USA), the extreme topography, large regional extent, and varying climate result in annual precipitation values ranging from 120 in. (3,050 mm) to 10 in. (254 mm). The state's precipitation network recently has expanded significantly, but there is still room for improvement. A recent intensity-duration-frequency (idf) exercise for the state showed that: (1) although density and spatial coverage of stations have increased, large areas in northern and western Alaska are still without gauge coverage; (2) the number of gauges at higher elevations is insufficient, although growing (e.g., the number of stations above 1,000 ft (305 m) increased from 26 gauges in 1963 to 134 gauges in 2012); (3) solid precipitation is difficult to quantify, and at unmanned sites, the phase of precipitation (liquid or solid) is hard to determine, as air temperature is often the only other measured variable; (4) corrections for gauge undercatch need to be made but too often information on the shielded status of gauges and wind speed is lacking; and (5) in the recent idf analysis only about one-third of the existing and historical stations were used because of data-quality issues. Obviously, overall improvements in precipitation data collection can and should be made.

scholarly journals Supplemental Material: Early–Middle Devonian brachiopod provincialism and bioregionalization at high latitudes: A case study from southwestern Gondwana

2020 ◽  
Author(s):  
C.R. Penn-Clarke ◽  
D.A.T. Harper
Keyword(s):  
Cluster Analysis ◽  
Middle Devonian ◽  
High Latitudes

Two-way Jaccard cluster analysis of the dataset comparing the relational grouping among brachiopod genera to their respective depobasins and bioregions.

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