Results 41 to 50 of about 214,281 (117)

Distance sampling: comparing walked transects and road transects for rock ptarmigan densities and population trends

Wildlife Biology, EarlyView.
We compared population trends for rock ptarmigan Lagopus muta densities (2003‒2019) derived from walked transects and driven road transects in Mosfellsheiði and Slétta in southwest and northeast Iceland, respectively. The walked transects were laid out according to a random rule.
Matteo Ferrarini, Ólafur K. Nielsen
wiley   +1 more source

Emplacing a cooling-limited rhyolite lava flow: similarities with basaltic lava flows [PDF]

, 2017
Accurate forecasts of lava flow length rely on estimates of eruption andmagma properties and, potentially more challengingly, on an understanding of the relative influence of characteristics such as the apparent viscosity, the yield strength of the ...
James, Mike R., Magnall, Nathan, Tuffen, Hugh, Vye-Brown, Charlotte   +3 more
core   +2 more sources

Marine‐derived nutrients shape the functional composition of High Arctic plant communities

Functional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Low temperatures and nutrient limitation have shaped Arctic plant communities, which are now affected by biome‐wise changes in both climate and nutrient cycling. Rising temperatures are favouring taller plant species with more resource‐acquisitive traits across the ...
Ruben E. Roos, Julia Kemppinen, Pekka Niittynen, Vigdis Vandvik, Inge Althuizen, Pernille Bronken Eidesen, Brian J. Enquist, Geir Wing Gabrielsen, Jonathan J. Henn, Ingibjörg S. Jónsdóttir, Kari Klanderud, Simone I. Lang, Kai Lepley, Marc Macias‐Fauria, Brian S. Maitner, Yadvinder Malhi, Sean T. Michaletz, Richard J. Telford, Polly Bass, Matiss Castorena, Siri Vatsø Haugum, Yaoqi Li, Mary C. Linabury, Barbara M. Neto‐Bradley, Molly Ng, Karolína Pánková, Marcus P. Spiegel, Eleanor R. Thomson, Lucely L. Vilca‐Bustamante, Aud H. Halbritter   +29 more
wiley   +1 more source

Studies of fluid instabilities in flows of lava and debris [PDF]

At least two instabilities have been identified and utilized in lava flow studies: surface folding and gravity instability. Both lead to the development of regularly spaced structures on the surfaces of lava flows. The geometry of surface folds have been
Fink, Jonathan H.
core   +1 more source

Arthropod abundances track soil fertility across a lowland tropical forest landscape

Journal of Animal Ecology, EarlyView.
This study reveals strong, diverse associations between soil phosphorus and the abundances of understorey arthropods across a lowland tropical forest landscape. These patterns were not paralleled in an adjacent site‐level fertilisation experiment, raising the interesting possibility that arthropod–phosphorus associations could be mediated by spatial ...
Orpheus M. Butler, Vanessa Sanchez, Kara J. Simpson, Donald Windsor   +3 more
wiley   +1 more source

Morphology and dynamics of inflated subaqueous basaltic lava flows [PDF]

, 2014
International audienceDuring eruptions onto low slopes, basaltic Pahoehoe lava can form thin lobes that progressively coalesce and inflate to many times their original thickness, due to a steady injection of magma beneath brittle and viscoelastic layers ...
Anne Deschamps, Appelgate, Bondre, Brigitte Van Vliet-Lanoe, Calzia, Carbotte, Cashman, Cashman, Chadwick, Chadwick, Chitwood, Chitwood, Clauser, Cormier, Crisp, Cécile Grigné, Deschamps, Dragoni, Dugas, Duraiswami, Einarsson, Einarsson, Einarsson, Ely, Fink, Fornari, France Floc'h, Garel, Greeley, Greeley, Gregg, Gregg, Griffiths, Griffiths, Guilbaud, Harris, Hart, Hart, Head, Helo, Hoblitt, Holcomb, Hon, Hon, Hooper, Hooper, Horai, Howard, Hughes, James, Jensen, Jones, Jones, Kahle, Kauahikaua, Keith, Kent, Keszthelyi, Keszthelyi, Kreith, Kuntz, Kuntz, Leeman, Lenat, Lyle, Macdonald, Mattsson, McClinton, Morgane Le Saout, Morris, Orem, Otto, Pascal Allemand, Patrick, Pearson, Peterson, Rossi, Rowland, Russell, Ryan, Saemundsson, Sakimoto, Salisbury, Samuel Adam Soule, Scheirer, Schmincke, Self, Self, Self, Self, Sherrod, Sigmarsson, Steingrímsson, Sutherland, Swanson, Tepley, Thorarinsson, Thordarson, Thordarson, Thordarson, Thordarson, Thordarson, Tolan, Turcotte, Walker, Walker, Walker, Wang, Wantim, Wood, Wright, Ólafsson   +111 more
core   +3 more sources

The Bronze Age Tombs of Northwest Arabia: A Chrono‐Typological Study From AlUla and Khaybar, Saudi Arabia

Arabian Archaeology and Epigraphy, EarlyView.
ABSTRACT Northwest Arabia is marked by tens of thousands of monumental burial structures, most of which appear to have been built during the Bronze Age. These funerary features range from simple cairns and tower tombs through to large ‘pendant’ burials with elaborate tail constructions.
Hugh Thomas, Jane McMahon, Lauren Swift, Daniel Franklin, Fahad Bagdadi, Rudolph Alagich, Melissa Kennedy   +6 more
wiley   +1 more source

Basalt models for the Mars penetrator mission: Geology of the Amboy Lava Field, California [PDF]

Amboy lava field (San Bernardino County, California) is a Holocene basalt flow selected as a test site for potential Mars Penetrators. A discussion is presented of (1) the general relations of basalt flow features and textures to styles of eruptions on ...
Bunch, T. E., Greeley, R.
core   +1 more source

Northwest Africa 5790. Top Sequence of the Nakhlite Pile [PDF]

, 2010
NWA 5790 is a recently discovered nakhlite. Its mineralogy, petrology and geochemistry suggest that it is the topmost sequence of the nakhlite lava ...
Badia, D., Barrat, J. A., Bollinger, C., Boudouma, O., Franchi, I., Greenwood, R. C., Jambon, A, Sautter, V.   +7 more
core  

Organic matter responses to radiation under lunar conditions [PDF]

, 2016
Large bodies, such as the Moon, which have remained relatively unaltered for long periods of time have the potential to preserve a record of organic chemical processes from early in the history of the solar system. A record of volatiles and impactors may
Crawford, IA, Jones, AP, Joy, KH, Matthewman, R, Sephton, MA   +4 more
core   +3 more sources