Page 2 - LoValvo_Massa_2000

126 F. Lo Valvo and B. Massa

Downloaded by [31.185.98.131] at 13:16 23 June 2016 ringing and recovery sites only of individuals adults and 31 (1.8%) ringed as chicks. The
ringed in the sectors A-D, about 50% of the total. percentage of adults recovered 1-6 years after
Some nests were marked by a plastic strip fixed ringing ranged between 0 and 53.8%. Only eight
on the ground, on which the ring number of one adults (0.6%) were recovered twice in different
or both partners has been written. Since each years after ringing. The low number of adults
year Storm Petrels have been ringed following a recovered in 1997 reflects the late visit to the
similar route, lower numbers of rings were used colony; by August chicks are well developed and
at the entrance of the corridors and higher ones adults attend them only at night.
at the end; this allowed us to establish site tenacity
following the same numerical sequence of many One individual ringed as a chick at Marettimo
recoveries along the corridors. on 16 July 1987 was recovered two years later
(on 15July 1989) at Filfla Is. (36°N, 14°E, Sicilian
RESULTS Channel, about 300kms east of Marettimo), and
another ringed as a chick at Marettimo on 26
In eleven seasons we ringed 1,374 adults (Table July 1992 was recovered five years later (on 8
1) and 1,708 chicks (Table 2). Since then we have July 1997) at Cabrera Is. (39°08'N, 2°56'E, about
recovered 207 (15.1%) individuals ringed as 800kms west of our study site); another ringed
as adult at Filfla on 15 June 1991 was recovered,

Table 1. Adult Storm Petrels ringed and recovered at Marettimo between 1986 and 1998.

Ringed 1987 1988 1990 1991 1992 1993 1994 1996 1997 1998 Recovered %

1986 193 20 10 2 32 16.6
1987 267 7
15 5.6

1988 40 71 1 9 22.5

1990 142 -1 9 6 12 28 19.7

1991 21 -- 12 3 14.3

1992 106 - - - 18 19 15 5 57 53.8

1993 117 -- 9 18 12 30 25.6

1994 225 -- -- - 18 5 23 10.2

1996 228 __ _ __ 10 10 4.4

1997 3

1998 32

Total 1,374 20 18 16 25 43 51 22 207

Table 2. Storm Petrels ringed at Marettimo as chicks and recovered as breeding adults between 1986 and 1998.

Ringed 1987 1988 1990 1991 1992 1993 1994 1996 1997 1998 Recovered %

1986 200 11 1 0.5
1987 173 12 2 1.2
1988 28 2 7.1
1990 125 2 1.6
1991 129 2 11 8.5
1992 172 1 5 2.9
1993 153 2 2 1.3
1994 227 2 3 1.3
1996 133 1 1 0.7
1997 164 2 2 1.2
1998 204
Total 1,708 10 31

© 2000 British Trust for Ornithology, Ringing & Migration,20, 125-128