Browsing by Subject "Flood"

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  • Vehkaoja, Mia; Nummi, Petri; Rikkinen, Jouko (2017)
    Beavers are ecosystem engineers that modify and maintain a range of special habitat types in boreal forests. They also produce large quantities of deadwood that provide substrate for many lignicolous organisms such as calicioid fungi (Ascomycota). We studied how calicioid diversity differed between boreal riparian forests with and without beaver activity. The results show that calicioid diversity were significantly higher at beaver sites compared to the other two forest site types studied. The large quantity and diverse forms of deadwood produced by beavers clearly promotes calicioid diversity in the boreal landscape. The specific lighting and humidity conditions within beaver wetlands could be the reason why they promote the success of certain calicioid species.
  • Nummi, Petri; Arzel, Celine; Sauramo, Virva (2021)
    Stability of breeding habitat use and population variability was studied in two common wader species: green sandpiper Tringa ochropus and common sandpiper Actitis hypoleucos in a boreal lake area in southern Finland. The main natural driver of habitat disturbance in the area is an ecosystem engineer, the North American beaver Castor canadensis. We also studied the presence and abundance of green sandpipers before, during and after beaver-induced floods. In the studied landscape, the variable habitat created by beaver flooding appeared to have carrying capacity for a larger green sandpiper population than the more stable habitat for that of the common sandpiper. Common sandpipers made much use of the same lakes from year to year whereas the occupation of wetlands by the green sandpiper was more variable. The population of common sandpipers fluctuated more, although they inhabited the more stable environment. Green sandpiper pair numbers increased during beaver flooding, which suggests that they adapt rapidly to changes in breeding site availability. Some of the facilitating effects of the beaver appeared to remain 1-2 years after the flooding.
  • WANG, Donald (2020)
    Atrahasis is the protagonist of an 18th-century BC Akkadian epic found in various versions on clay tablets. It has many parallels with the biblical account of creation in Genesis. This paper will closely examine the meaning and usage of spirit in Atrahasis. The point is that spirit in Atrahasis plays a vital role in the creation account of human beings and the spirit performs a bridging role in the overarching narrative of rebellion, creation, and flood.