The volunteers have finished and the community turtle monitors have just spent the last few days on the beach collecting data from the last of the hatched nests. So the quick summary of the data from the last two seasons is as follows:
*2006*142 potential nests marked
80 (56%) were true nests
62 (44%) were false nests or the nests were not located again (e.g. nest not marked precisely, markers lost during cyclones, etc.)
from those 80 true nests we had a total estimate of 10,950 eggs
10,089 (92%) of those eggs successfully hatched
861 (8%) did not survive
*2007*90 potential nests were marked
69 (77%) were true nests
17 (19%) were false nests or the nests were not located again (e.g. nest not marked precisely, markers lost during cyclones, nest taken, etc.)
4 (4%) have not hatched yet
from the 69 nests we had a total estimate of 8,060 eggs
8034 (91%) of those eggs successfully hatched
762 (9%) did not survive
*Possible explanations on number variations between the two years*1. Numbers of nesting turtles just plain old vary from year to year.
2. The weather conditions were much worse this year resulting in fewer nights spent surveying the nesting beach.
3. There seems to have been some taking of nests this year that didn't occur last year.
4. While fewer nests were located this year the percentage of true nests increased. This suggests that the community turtle monitors are getting better at identifying true nests.
We plan to make a couple of changes to the survey system next year that I am hoping will have some positive impacts. The first change is that we are going to try out more of a beach ranger type system for monitoring the beach. Essentially the volunteers will be split into 3 groups and paired with a community turtle monitor. Those 3 groups will then work in about 5 hour shifts so that there is always a group patrolling the beach from dusk until dawn (weather permitting). We are also going to use a different system to mark the nests so that the nest marker is not directly over the nest (e.g. the marker is 2 metres to the let of the nest). The marking will be different for each nest but will be recorded on the data sheets so that the people working on the turtle project are able to relocate the nest but potential poachers are not able to.
*Possible impacts of the planned change to the 'ranger' beach survey system next year and cryptic nest marking system*1. Having a presence of people on the beach from dusk until dawn should help deter people from stealing nests.
2. The marking system should make it difficult for others to find the nests. The key to this working will be proper documentation of how each nest has been marked.
3. More time on the beach should mean that fewer nesting turtles are missed. Many have been missed the last couple of years due to the fact we are not on the beach all night.