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Datingsurveys com

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Considering that woody species used by beavers in the region of Magallanes have only one ring per growing season, the determination of the dates of use of timber by beavers will be possible by cross dating of samples of dead trees with the series of growth rings of living trees whose age is known, since its last year of growth corresponds to the date on which the sample was collected.The dendrochronological approach is used to determine when a tree was cut by beavers, both during dispersal or when it has found a permanent establishment.

We used the oldest dates reported by the respondents as the estimated date of arrival for each river in the province and developed a map to visualize the possible route of arrival of beavers to the continent and their migration within it.After obtaining a clear exposition of the growth rings, their measurements were performed under a stereomicroscope using a ×15 magnification.The width of each ring was measured and recorded digitally (VELMEX, New York, USA).The questionnaire inquired about the presence or suspected presence of beavers or their signs, the date they saw the first beaver sign, considering presence of cut trees, dams, and/or beaver lodges.We established an area of perception in a range of 10 km of each surveyed property.The vegetation in these environments is represented by mixed forest of We estimated the perception of the date of arrival of beavers on the South American continent through interviews made in the Punta Arenas County, since this was the only county with a confirmed presence of beavers (Graells and Corcoran ), with the objective to survey most of the properties in the County.

In order to do this, we went door to door in every house where someone was found and interviewed them.

The core was hold in place with adhesive tape while the glue sets.

Finally, increment cores and cross sections were prepared using a rotary-sanding tool through a range of grit size from 100 to 700 (Pilcher ).

Our results indicate that this lag may not be constant among different groups of people.

(Castoridae) is an invasive species in southern South America, and it has been classified as a harmful species by the Chilean government (SERVICIO AGRICOLA Y GANADERO, Subdepartamento de vida silvestre DIPROREN ).

While they do this, they generate changes to the riparian environment that are only reversible at rates much slower than its natural rate, because they change the plant community structure and succession patterns and prevent the natural regeneration of forests and aquatic ecosystems (Anderson et al.