|
Updated 10 January
2004
Updates include extended hatching dates for
Hawksbill Turtles as well as hatching information to
date.
A Very Happy
New Year to
all our visitors to this site.
Welcome to our new website!
Welcome first time visitors and
return visitors alike.
We hope that you enjoy browsing
through our new site with its many beautiful photographs and
information about the island.
This page is all about what's happening
on the island and how the various conservation projects are progressing.
Turtles
Green Turtles:
Throughout May to September we had about 20 Green turtle nests all of
which produced between 75 and 150 hatchlings per nest.
Hawksbill Turtles:
The Hawksbill turtle nesting season has now begun with our first nest on
30 September. So far we have had 31 nests which means our first
hatchlings will start appearing around 26 November as the egg incubation
period is 58 days depending on temperature and weather conditions. Due
to the natural movement of sand we have had to move 3 nests to a safer
area to avoid them being washed away.
Steven, Rose-May, Lizanne, Elsa and Georges all do
regular beach patrols to record turtle activity. We also ask all our
guests to report any sightings and we explain to them what to do in the
event that they see a turtle coming up the beach. If a
turtle is reported nesting, when possible we will tell any guests we see around so they
can go and watch.
28 November 2003: 56 nests.
04 December 2003: 62 nests
11 December 2003: 79 nests
30 December 2003: 107 nests
10 January 2004:
120 nests
Expected Hawksbill Turtle hatching dates: (Based on an
average 58 days
incubation) - hatching can vary
depending on the temperature and rainfall.
January: 10, 11, 12, 13, 14, 15, 18, 19, 20, 21, 22, 23,
24, 25, 26, 27, 28, 29, 30, 31
February: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13,
14, 15, 16, 17, 18, 19, 20, 23, 24, 25, 29
March: 1, 2, 4, 5
Hatching
Success:
10 January 2004
Nests Hatched:
31
Hatchlings Live:
2049 Representing 18 nests
Nests invaded by crabs all
eggs eaten: 3 nests
Nests eroded by wave action:
3
Nests which hatched
earlier than expected
(hatchlings not seen):
7
Due to the normal
pattern of beach sand movement at this time of year we had had to
move 10 turtle nests to a safer location.
Beach Monitoring
We were approached by the Government of Seychelles
in September to take part in a worldwide beach monitoring programme. The very
nature of Bird Island and the constant movement of sand from one season
to the next means that this information will be of use to scientist
monitoring sea level changes. We were very interested to take part in
this study particularly as the island was subject to a lot of erosion
between 1988 and 1993 which saw the loss of around 75m of land from the
west coast. This was so severe that the Lodge had to be rebuilt further
inland . The coastal zone unit came to the island from Mahé and set up
points of reference. The first survey was done on 1st October and a
subsequent one carried out by the 'Team' on 1st November. We plan to do
the survey on the first of each month at low tide. The team: Lizanne,
Elsa, Lizanne, Rose-May and Steven helped by Georges and Margaret Norah.
04 December 2003:
The third survey took place on Sunday 30 November at low tide in the
afternoon.
27 December
2004: The fourth beach survey took place.
We were helped by Nick Bray, one of our regular guests who is a coastal
engineer. Thank you Nick!
Birds
Tropic Birds:
Having been away from Bird for 6 years, we have
noticed a marked increase in the number of Wedge-tailed Shearwaters and
White tailed tropicbirds. Both are ground nesting. Rats were eradicated
from the island in 1996 and maybe the increase is related to this as
they would have preyed on both eggs and chicks.
In 1996 there were 6
pairs. We now have 28 different nesting sites which are regularly
checked. To date 28 adult Tropicbirds have been ringed and 8 chicks. Not
all nesting adults and chicks have been ringed yet, but we hope that as
time goes by to be able to continue this programme.
28
November 2003 Three new nest sites have
been established bring the total of nest sites to 31. A site was lost
when the Casuarina tree in front of the restaurant fell in April, but in
the last couple of weeks a tropicbird has re-established a new site in
the upturned root. Two chicks were ringed on 12 November and three
adults on 22 November. There are now 32 ringed adults and 10 chicks.
John and Viv Phillips, who were wardens on Cousin in the early '80's
helped and John was able to give us some valuable information about the
bird's various habits as he carried out several studies on them.
10 January 2004
The tropic bird chick in the roots in front of the
restaurant is now well on the way to fledging, as is the chick in one of
the new nest sites near chalet 26. In December we were knocking down a
very old water tower and discovered a chick which was almost ready to
fledge. We moved it to an old concrete box (used originally as an
electric cable housing) we kept our fingers crossed that the parents
would find it as it was so big and had a very loud call. They did find
it and it fledged successfully a week later.
Migrants/Vagrants:
The
wind changed from SE to NW mid-October and we have had a couple of days
with quite strong westerly winds blowing. We are always on the look out
for vagrants after westerly winds
21 November 2003 Recorded so far this season: Black-Winged stilt (juvenile),
Red-Backed Shrike, Golden Oriole, Purple Heron (juvenile), Oriental Pratincole,
20-30
Swallows, 2 House Martins, 4 Blue-Cheeked Bee-eaters,
Corncrake, 2 Yellow Wagtails, Tree Pipit. 3 Ringed Plovers These are in addition to the
usual migrants such as Turnstones and Curlew Sandpipers which have a
presence throughout the year with an increase in numbers between October
and April.
28 November 2003
A very exciting Vagrant appeared on the island on 22
November. A Bimaculated Lark was seen by John and Viv Phillips. They
returned to the island with Adrian Skerrett from the Seychelles Birds
Records Committee and it will most likely be confirmed as not only a
first for Seychelles but a first record for the Southern Hemisphere.
04 December 2003
Here is a copy of the article that Adrian Skerrett wrote for the
Seychelles Nation newspaper. Adrian Skerrett has co-authored a field
guide to the birds of Seychelles, and is also on the Seychelles Birds
Records Committee.
ISLAND CONSERVATION – A LARK AT BIRD
ISLAND
Seychelles Nation - 01 December 2003
John and Viv Phillips were
Wardens on Cousin Island 20 years ago. Like many who come here, they
fell in love with Seychelles and have returned several times. They
recently visited Bird Island and knowing how keen they are on birds, I
just knew they would find something special. But little did I know just
how special.
“Here is my list from Bird,” John said to me, and I glanced at the
impressively long column of bird names. Barn Swallow, Amur Falcon,
White Wagtail; all species that have been found a number of times in
Seychelles. One name stood out.
Now if you have never heard of Bimaculated Lark don’t worry; not many
people have. However, when I saw this name on the list I got very
excited because this is something that has never been recorded in the
entire Southern hemisphere, never mind just Seychelles. This was really
very special.
When Ian Bullock and I wrote the
field guide to the birds of Seychelles we tried to predict what species
might occur in the country at a future date and mentioned these in the
text. Predictions are dangerous things. One species of lark had been
seen here, Short-toed Lark. No other species has ever crossed the
Equator in Africa. Not unreasonably, we thought that if none could
cross the Sahara desert, then none could cross the Indian Ocean, so we
wrote “No other lark is likely to be recorded in Seychelles”. Now we
have to eat our words!
Bird Island is the best place to see rare birds like Bimaculated Lark
and this is the best time of year. So, I decided I could afford to take
a day off and flew to the island in the hope the lark was still there.
I was lucky. At the Sooty Tern colony, all the Sooties have gone, but
the Bimaculated Lark has made this its territory. It was in fine
condition after its unexpectedly long journey, and seemed to be finding
plenty of food. It has crossed the Indian Ocean once, and one day when
its instincts tell it that it is time to return to its breeding grounds
in Asia, there is no reason why it cannot do so again.
There will be a Second Edition of Birds of Seychelles one day. It will
include an entry for the rare Bimaculated Lark, and the text for
Short-toed Lark will be changed. In fact, while I’m at it, I had better
make sure that there are no other predictions about what will “never
happen”. In Seychelles and on Bird Island in particular, you simply
never, never know!
04 December 2003 - Other vagrants:
up to 10 Amur Falcons at once, (Originally known as Eurasian Red-footed
Falcon) European Nightjar, 2 White Wagtails, Quails, European turtle
Dove, Common Cuckoo, two Northern Wheatears, up to 20 Barn
Swallows (grand total probably more), Tree Pipits maximum at any one time 5
or 6 - total possibly up to 10.
10
January 2004 - No new sightings 3 or 4 Amur Falcons are
still present, the Black-winged Stilt is rapidly gaining its adult
plumage and is regularly seen on the airstrip with 6 Greenshanks.
Sooty Terns:
11 December 2003 New report
received from Chris Feare on 11 December 2003 which details
the complied results of his visit in June 2003.
Sooty Tern arrival on Bird
Island appeared normal in 2003 and did not suggest early laying, as had
happened in 2000 and 2001. I therefore planned my visit to Bird Island
for the second half of June, the aim being to search for ringed birds as
they incubated in the huge colony. This is to collect data on the return
of the ringed birds in order to monitor annual survival and to identify
inter-island movements. Once again, my younger son Simon came to help
but this year my elder son, Adam (who had spent part of his babyhood on
Bird Island in 1972) and his girlfriend Nicky also helped. In addition,
Georges and Margaret Norah had kindly arranged for Eva Schumacher and
Christoph Küfler to assist, along with Elsa Richard, the island staff
member who has taken over the conservation role on the island. So our
team of seven set about the hunt for ringed birds!
In most years we have caught 150-250 ringed birds, which represents
(according to Paul Doherty, the statistician who analyses the data)
about 8-14% of the ringed birds in the colony. This is sufficient to
gain a basic estimate of annual adult survival. But Paul maintains that
for more sophisticated analyses, such as an estimate of adult survival
each year, and to estimate survival of young birds between fledging and
their return to breed 6 or more years later, we need to catch about 30%
of ringed birds each year. I have maintained that this is not possible,
but in the event, in 2003 we caught 334 ringed birds, probably closer to
20% of those available to be caught. This important finding illustrates
that with more assistance and with more time being devoted to searching,
we could make even better use of the unique resource that Bird Island’s
ringed Sooty Terns represent.
Before my departure I counted the number of eggs in 30 marked plots
within the colony. For the second year running, Nature Seychelles, this
year represented by Ian Valmont and Catherina Onezia, counted chicks in
these plots at the end of August, just before fledging. This gave an
estimate of fledging success in 2003 of 71 %. This is high (Georges and
Margaret felt that this was one of the best years they had experienced)
and was achieved despite heavy rain during the fledging period.
Two papers will appear shortly, one on sound production in a Sooty tern
colony, to appear in Waterbirds, and a first estimate of annual
survival in this species, in Ibis.
As usual, thanks go to all who have made this study possible and we look
forward to more progress in the years to come.
Chris Feare
|