TY  - JOUR
A1  - Bamberg, Marlene
A1  - Jaumann, Ralf
A1  - Asche, Hartmut
A1  - Kneissl, T.
A1  - Michael, G. G.
T1  - Floor-Fractured Craters on Mars - Observations and Origin
JF  - Planetary and space science
N2  - Floor-Fractured Craters (FFCs) represent an impact crater type, where the infilling is separated by cracks into knobs of different sizes and shapes. This work focuses on the possible processes which form FFCs to understand the relationship between location and geological environment. We generated a global distribution map using new High Resolution Stereo Camera and Context Camera images. Four hundred and twenty-one potential FFCs have been identified on Mars. A strong link exists among floor fracturing, chaotic terrain, outflow channels and the dichotomy boundary. However, FFCs are also found in the Martian highlands. Additionally, two very diverse craters are used as a case study and we compared them regarding appearance of the surface units, chronology and geological processes. Five potential models of floor fracturing are presented and discussed here. The analyses suggest an origin due to volcanic activity, groundwater migration or tensile stresses. Also subsurface ice reservoirs and tectonic activity are taken into account. Furthermore, the origin of fracturing differs according to the location on Mars. (C) 2013 Elsevier Ltd. All rights reserved.
KW  - Distribution
KW  - Volcanic activity
KW  - Fluvial processes
KW  - Infilling
KW  - Polygons
KW  - Tectonic
Y1  - 2014
U6  - https://doi.org/10.1016/j.pss.2013.09.017
SN  - 0032-0633
VL  - 98
SP  - 146
EP  - 162
PB  - Elsevier
CY  - Oxford
ER  - 
TY  - JOUR
A1  - Kruckenberg, Helmut
A1  - Müller, Thomas
A1  - Freuling, Conrad
A1  - Mühle, Ralf-Udo
A1  - Globig, Anja
A1  - Schirrmeier, Horst
A1  - Buss, Melanie
A1  - Harder, Timm
A1  - Kramer, Matthias
A1  - Teske, Kathrin
A1  - Polderdijk, Kees
A1  - Wallschläger, Hans-Dieter
A1  - Hlinak, Andreas
T1  - Serological and virological survey and resighting of marked wild geese in Germany
JF  - European journal of wildlife research
N2  - In order to investigate the potential role of arctic geese in the epidemiology, the spatial and temporal spread of selected avian diseases, in autumn 2002, a virological and serological survey designed as capture-mark-resighting study was conducted in one of the most important coastal resting sites for migratory waterfowl in Germany. Orophatyngeal, cloacal swabs and blood samples were collected from a total of 147 birds comprising of three different arctic geese species including White-fronted Goose (Anser albifrons), Tundra Bean Goose (Anser fabalis rossicus), Pink-footed Goose (Anser brachyrhynchus) as well as from 29 non-migratory Canada Geese (Branta canadensis). Altogether, six adeno-like viruses (ALV; 95% CI, 1.74-9.92%) and two avian paramyxoviruses (APMV-4; 95% Cl, 0.19-5.53%) were isolated mainly from juvenile White-fronted Geese. In addition, four Canada Geese were infected with lentogenic APMV-1 (95% CI, 3.89-31.66%) at the date of sampling. No avian influenza viruses, reo-like viruses could be isolated despite serological evidence. Likewise, no evidence of current or previous infection by West Nile virus was found. Of the 147 birds tagged in the following years, 137 birds were resighted between 2002 and 2008 accumulating to 1925 sightings. About 90% of all sightings were reported from the main wintering and resting sites in Germany and The Netherlands. Eight of the resighted geese were virus positive (ALV and APMV-4) at the time point of sampling in 2002.
KW  - Wild geese
KW  - Anser albifrons
KW  - White-fronted goose
KW  - Disease
KW  - Spatial distribution
KW  - Winter
KW  - Distribution
KW  - Branta canadensis
KW  - Canada goose
KW  - Virus
KW  - Infection
KW  - Neckbanding
Y1  - 2011
U6  - https://doi.org/10.1007/s10344-011-0514-1
SN  - 1612-4642
VL  - 57
IS  - 5
SP  - 1025
EP  - 1032
PB  - Springer
CY  - New York
ER  -