|
|
|
|
|
| Dauvin, Jean-claude; Dewarumez, Jean-marie; Elkaim, B; Bernardo, D; Fromentin, Jean-marc; Ibanez, F. |
| Populations of Abra alba (Wood) (Mollusca : Bivalvia) were studied over a fifteen-years period at three sites: the southern part of the North Sea (Gravelines area), the Bay of Seine, and the Bay of Morlaix in the western English Channel. These surveys provide an example of long-term changes in a species considered as ''opportunistic'' and as a ''biological indicator'' of disturbance. A summed cumulated function was used to compare the changes of the Abra alba populations and of mean air temperature in each area. The graph of this function shows the timing and duration of changes. Four or five main periods were identified at each site, with a succession of periods of abundance, stability, and decrease. The abundance periods were separated by ten years in... |
| Tipo: Text |
Palavras-chave: ABRA-ALBA; LONG-TERM CHANGES; CYCLES; CLIMATIC STRESS. |
| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/00099/21066/18692.pdf |
| |
|
|
| Fromentin, Jean-marc; Ibanez, F. |
| Chronological series (1949 to 1992) of air temperature, precipitation, atmospheric pressure and wind in different parts of the French coast show evidence of important year-to-year changes, trends and cycles: seven-eight years for temperature, and around three years for precipitation and atmospheric pressure. On the scale of France, it appears that spatial heterogeneity of meteorological factors is smaller than temporal heterogeneity. New methods, such as the cumulative sums method or the envelopes of a variable reveal the interest for ecologists of essaying different numerical approaches. A comparison between climatic series and biological series of a benthic and a pelagic species is described for this purpose. |
| Tipo: Text |
Palavras-chave: METEOROLOGICAL SERIES; BIOLOGICAL SERIES; TRENDS; CYCLES; CHANGES. |
| Ano: 1994 |
URL: http://archimer.ifremer.fr/doc/00098/20891/18505.pdf |
| |
|
|
|
