Bei der Gelegenheit hier noch einige Literaturangaben die zeigen wie lange verschiedene Arten am Standort leben,
wäre Manne mit seinem Wuxal und Gyphosat vor Ort gewesen hätte es wohl besser ausgesehen.
Viele Autoren sind sich sicher
dass es eine Dormanz gibt,
siehe Tabelle unten,
zB bei militaris bis 8 Jahre
kann das sein??
[Sie müssen registriert oder eingeloggt sein, um diesen Link sehen zu können]Es gibt Arten die oft am Standort noch kurzlebiger sind als Himantoglossum,
so wurde
Caeloglossum viride in einer Population in Holland nur
1,5 Jahre im Mittel,
und Ophrys sphegodes in England im Mittel 1,9 Jahre alt
einzelne Pflanzen werden älter
1,9 war eben dort der Durchschnitt.
„For other orchid species it has been shown that half-lives are much higher than for 0. sphegodes and C. viride,
e.g. for 0. apifera 5.8-11.2 yr (mean 6.6) (Wells & Cox,
1991),
for Aceras anthropophorum 4.0-7.8 yr (mean 5.8
and for Spiranthes spiralis 4.6-9.2 yr (mean 6.9) (Wells, 1981).
Very long-lived species are Dact sambucina and Listera ovata with an average half-life span of c. 20 and 80 years, respectively
(Hutchings, 1989)
Both short-lived species have a number of population characteristics in common, of which the most striking is that individuals are already able to flower during the first year following their emergence“
Orchis ustulata wird in anderer Studie aus Estland auch nicht älter
half-life: 0.9–3.2 years
Tali, K., Foley, M.J., Kull, T., 2004. Orchis ustulata. J. Ecol. 92, 174– 184.
Tali, K. (2002) Dynamics of Orchis ustulata L. populations in
Estonia. Underlying Mechanisms of Trends and Fluctuations
in Terrestrial Orchid Populations (eds P. Kindlmann,
J. Willems & D. Whigham), pp. 33–42. Bakhuys Publishers,
Leiden, The Netherlands.
Dormancy is very common and a plant is able to survive without forming any above-ground parts for 1–3(−4) years .
Ustulata is relatively short-lived (Tali 2002). Among 464 plants, individually monitored over a 6–8 years period in five different populations in continental Europe, only four flowered for
seven consecutive years; most plants flowered
for 1–4 years and then either died or remained in a vegetative
or dormant state for several years.
Patterns of transition between the flowering, dormant and vegetative stages show that the transition to dormancy both from
vegetative and generative stages is frequent and occurs
more often in the late-flowering variety (Tali & Kull 2001).
Coeloglossum:
Population dynamics and life-history of Coeloglossum
Willems 1989
The results of a 7 year demographic study of a
population of C. viride in The Netherlands are presented. Annual recruitment and mortality vary considerably from year to year, whereas the flux in individual plants is always high.
The half-life of the cohorts varies from 1 to 2.4 years and is on average c. 1.5 years.
The study area 'Berghofweide' is situated in south Limburg...
Individual plants of C. viride have been monitored in a permanently marked plot (3 x 3 m) by triangulation with two hardwood pegs driven into the subsoil (cf. Wells,
1967).
Following this method it is possible to return to the same plant or spot if the plant is absent afterwards in subsequent years. In this way it is also possible to record temporary absence above ground of a given plant.
From this study it has become evident that, in The Netherlands, C. viride must be considered a short-lived terrestrial orchid species. Whether this also holds true for the species throughout its large distribution area is unknown.
Together with Ophys spegodes this is the second orchid species in western Europe for which a very limited life span for the majority of the individual plants has been established.
The half-lives of the cohorts of C. v i d e (1.0-2.4yr, mean 1.5) are to a high degree in accordance with those of
O sphegodes (1.5-2.3 yr, mean 1.9) (Hutchings 1987a,b).
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