Monitoraggio a lungo termine di trapianti di Posidonia oceanica su vasta scala
Author(s)
Carannante, Flora
Date Issued
February 10, 2011
Type
Doctoral Thesis
Abstract
This thesis was mainly aimed to analyze the survival and growth of
transplanted Posidonia oceanica shoots in the framework of two large restoration
projects that have been carried out so far. The first restoration site is located off S.
Marinella (RM), with a 10000 m2 transplanted area, the second one is not far from
the Ischia (NA) harbour and on with area of about 1600 m2. The total amount of
the transplanted areas in these sites is larger than the sum of all the other P.
oceanica transplantation experiments that have been carried out elsewhere.
The success of the transplantation has been monitored every three months
for five years in S. Marinella and for 18 months so far in Ischia. Fourty sampling
stations were monitored In Santa Marinella site and six sampling stands in Ischia
site. In each sampling stand the survival rate has been assessed by counting the
shoots in twenty square concrete frames (50x50 cm). In each frame eight shoots
were transplanted at the beginning of the experiment.
After five years the overall survival rate of the transplanted shoots in S.
Marinella is 91%. For the calculation of this data the shoots lost during an
exceptional storm were also considered. This storm caused also heavy damages
to the natural Posidonia meadow. In the Ischia site, where wave impact is lighter,
the overall survival rate after 18 months is 141%. In both sites the trend of the
survival rate is steadily increasing.
Testing new devices for holding in place transplanted P. oceanica shoots and
monitoring the density of P. oceanica beds in 20x20 cm squares were two
secondary goals of this thesis.
Obtained results in terms of survival of the shots transplanted utilizing the new
anchoring devices, in particular in special circumstances such as on dead matte
of P. oceanica, suggest that these devices may be considered as viable
alternatives to the concrete frames. Finally, trials of low-density removal of
Posidonia shots from natural meadow for the transplanting experiment indicate
that this technique can be an effective solution for small-scale transplantation,
aimed to increase in genetic diversity of the local genetic diversity of P. oceanica
as a remedy for long-term regression.
Additional information
Tesi di dottorato in Ecologia e gestione delle risorse biologiche
File(s)![Thumbnail Image]()
Name
fcarannante_tesid.pdf
Size
3.23 MB
Format
Adobe PDF
Checksum (MD5)
1b89ffadfed15b684fde2bf250dfa38d