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1

The history of Scots pine encroachment and retreat in ombrotrophic bog recorded in woody debris

100%
Woziwoda B., Pawicka K.
Polish Journal of Ecology
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2013
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tom 61
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nr 2
Using the characteristic of accumulated woody debris, data on vegetation, and data on previous climate fluctuations, we reconstructed the history of Scots pine (Pinus sylvestris L.) encroachment and retreat in a raised bog. The available patchy information on plant cover allowed us to pinpoint events in the development of pine seedlings and the first cases of trees dying off on the time scale. The results obtained show that the process of natural bog afforestation and deforestation was very dynamic and lasted only 22 years. These short-term changes in the tree populations were clearly linked to short-term climate fluctuations. The annual precipitation and mean temperature of winter months were the most important variables and the main factors directly influencing the young woodland. We assumed that the woody remnants represent the last stage of the contemporary phase of high germination and dying-off (GDO) of pine trees. The spatial distribution of woody debris and its characteristics indicate the naturalness of vegetation during this temporary ‘woodland phase’. The study show that the investigation of woody debris can be used to further improve our understanding of bog vegetation dynamics, especially with regard to the influence of periodical climate fluctuations on transitions between open and forested peatland.
2

Population dynamics of five sigmodontine rodents of Northwestern Patagonia

100%
Guthmann N., Lozada M., Monjeau J. A., Heinemann K. M.
Acta Theriologica
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1997
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tom 42
|
nr 2
Population dynamics of five rodent species were studied, from March 1991 to August 1994, in an area located in the ecotonal steppe of northwestern Patagonia, Argentina {at about 40°S). Seasonal and annual fluctuations in population numbers were found in all sigmodontine species. The reproductive period, sex ratio and longevity of the five species were also studied. Abrothrix xanthorhinus (Waterhouse, 1837), a habitat generalist, was the most abundant species. Eligmodontia morgani (Allen, 1901), Abrothrix longipilis (Waterhouse, 1837), Reithrodon auritus (Fischer, 1814) and Oligoryzomys longicaudatus (Bennett, 1832) were subdominant. The present study is a first description of the population dynamics in this rodent community, whose ecological characteristics gather importance considering that some of these species are Hantavirus reservoirs.
3

Seasonal changes in the Mya arenaria [L.] population from Inner Puck Bay

88%
Miac J., Groth M., Wolowicz M.
Oceanologia
|
1997
|
tom 39
|
nr 2
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