Model of the seasonal variations of fungi ingestion and 137Cs activity concentrations in roe deer

Ávila, R.; Johanson, Karl J.; Bergström, Roger

doi:10.1016/s0265-931x(98)00108-8

Cited by 36 publications

(23 citation statements)

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“…When all measured values of 137 Cs activity concentrations in roe deer were pooled, it was not possible to demonstrate differences between the years. This is not surprising if we take into account that there are very large within-year variations of 13 Cs levels in roe deer [4]. The 137 Cs levels in roe deer during the spring (May-June) and late autumn-winter (October-January) hunting seasons were approximately constant during the whole study period (Fig.…”

Section: C1-38imentioning

confidence: 73%

“…A description of the vegetation and fauna of this area can be found in [4]. The amount of rain in the research area was obtained from the meteorological station closest to this area (Harbo station).…”

Section: Methodsmentioning

confidence: 99%

“…Mushrooms have higher l37 Cs levels (from 4 to 80 times higher) than other roe deer feeds. These two factors can quantitatively explain the seasonal dynamics and betweenyears variation of 137 Cs levels in roe deer observed in this area [4]. Using the model described therein it was possible to estimate that the average ingestion rate of mushrooms by roe deer during AugustSeptember was about 13 % of the total daily food ingestion.…”

Section: C1-38imentioning

confidence: 98%

“…The results obtained in these studies up-to 1994 have been used in previous publications with various purposes [1,2,3,4]. In this paper we present a comparative analysis of the whole data set of I37 Cs activity concentrations in roe deer and moose meat collected in this area from 1988 to 1997.…”

Section: Introductionmentioning

confidence: 93%

“…A possible explanation for such correlation is that moose also eats mushrooms during August-September. Assuming that there is linear proportionality between the ingestion rate of mushrooms in August-September by moose and roe deer it was possible to estimate, using the model described in [4], that the ingestion of mushrooms by moose was between 0.25 % (1995) and 1.1 % (1991) of the total daily food intake. These values are reasonably close to values estimated from rumen content by Cederlund et al [6] and by Johanson et al [3].…”

Section: Correlation Between Roe Deer and Moosementioning

confidence: 99%

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The paper describes the results of a comparative study of the seasonal and long-term dynamics of the levels of 137 Cs in roe deer and moose harvested in a relatively small area (100 km 2 ) of central Sweden. Samples of roe deer (N=1084) and moose (N=1922) were collected in 1988-1997 mainly during the hunting seasons. It is shown that the long-term decrease of |37 Cs levels in roe deer and moose is dominated by l37 Cs radioactive disintegration. Any other possible long-term trend of 137 Cs levels in these game animals is obscured by large and non-systematic between-years variations. A significant correlation between the levels in roe deer in August-Sept em ber and the levels of 137 Cs in moose in October was observed. This correlation can explain 70 % of the between-years variation of the levels of l37 Cs in moose. The presented data indicate that there is a strong relationship between ingestion of fungi and the levels of 137 Cs levels in roe deer and moose during the summer-autumn period. This seems to be the main cause for the seasonal variations of ,37 Cs levels in roe deer and the between-years variations in Cs levels in roe deer in August-September and in moose in October observed in the study area. A significant correlation between the levels of 13 Cs in moose and the amount of rain in July-September was observed, which supports this conclusion. The number of fruit bodies of Suillus variegatus counted in six experimental plots located in the study area also confirms the important role of the ingestion of mushrooms. Estimations of the mushroom contribution to the total daily ingestion of food by roe deer and moose are provided.

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Section: C1-38imentioning

confidence: 73%

Section: Methodsmentioning

confidence: 99%

Section: C1-38imentioning

confidence: 98%