Wednesday, 28 August 2013

2013 breeding results

I. Introduction:
In the framework of the National Species Action Plan for Northern Bald Ibis, Geronticus eremita, prepared in 2008 by HCEFLCD (High Commission for Water and Forest and Fight against Desertification) with its partners, monitoring NBI is one of the main aspects to follow population dynamics. Collected data are essential to take any decision to manage the last viable NBI population in the world. 

II. Main activities and events in  2013

1. Wardens
Seven wardens are recruited with the cooperation of Prince Albert II of Monaco Foundation, 4 in Souss Massa National Park and 3 in Tamri area. 

2. Site C
Dummies installed at site C faded and are currently dusty. They are not efficient and should be retired.

3. Disturbance
Breeding sites didn't suffer too much disturbance by tourist, compared to previous years. 12 visitors, 9 of them birders, approached Tamri site and two photographers went close to sites A and F, in the Park. 
Nevertheless, this year site E was very frequented by fishermen just at the beginning of the breeding season. Wardens, assisted by rangers kindly persuaded the fishermen to leave.


4. Waterpoints
Waterpoints are daily cleaned and filled with fresh water by the wardens, during all the breeding season. Their monitoring showed a regular use by adults and, later, fledgings.

See here to know more about water supply


III. 2013 breeding season results 

Breeding season started in Tamri by the first week of February and finissed during the last week of Mai. Unlike the previous year, in 2013 60 pairs produced fledgings from 161 hatchlings. Although survival is relatively low (44%), productivity (1,1 fledgling/nest) is satisfactory. 
In SMNP breeding started later, by the first week of March, and finished in mid June. A lanner falcon prevented ibises to nest at site B (that usually holds 6 pairs), thus only 53 pairs nested and 77 fledging survived from 101 hatchings (survival 76%; productivity, 1,4 fledgling/nest). 
Altogether, 118 pairs were formed, 113 nested successfully and produced 262 chicks 148 of whom fledgled (survival rate, 56%, productivity, 1,3 fledgling/nest). 

Table 1. Results at the different sites.
Parameters
SMNP
TAMRI
PNSM & TAMRI

Site A
Site B
Site F
Site E
Total


Formed pairs
20
0
16
20
56
62
118
Laying pairs  (1)
20
0
15
18
53
60
113
Hatchlings
34
0
34
33
101
161
262
Fledglings (2)
28
0
24
25
77
71
148
Survival rate  (%)
82,3
0
70,5
75,7
76,2
44
56,4
Productivity (2/1)
1,4
0
1,6
1,3
1,4
1,1
1,3

Differences with 2012 (Table 2) are due to the good weather conditions, with rains well distributed between September 2012 and April 2013. 

Table 2. Comparaison between 2012 and 2013
Parameter
SMNP
Tamri
SMNP &Tamri

2012
2013
2012
2013
2012
2013
Formed pairs
62
56
43
62
105
118
Laying pairs (1)
54
53
11
60
65
113
Hatchlings
95
101
0
161
95
262
Fledglings  (2)
56
77
0
71
56
148
Productivity (2/1)
1
1.4
0
1.1
0.8
1.3

The number of pairs is the highest since the creation of the Park (Figure 1).

Figure 1 : Evolution of number of NBI breeding pairs in Souss-Massa region

The number of chicks produced also increased (Figure 2), despite the relatively low survival rates observed in Tamri site, and it's one of the highest even recorded.  This mortality could be explained, among other things, by a shortness of food resources available in a region in which there is more disturbance from human activities (tourism development, nomadic herds, ...).

Figure 2 : Evolution of productivity of NBI population in Souss-Massa region (blue, number of fledglings; red, productivity)

Regular census shows that before breeding there were 319 individuals. After breeding, the number rose to 443 birds (Figure 3) .

Figure 3: Evolution of NBI population at Souss-Massa region before (blue) and after (pink) breeding
The gap between both figures some years reachs more than 100, meaning that a number of birds disperses outside the prospected area. 

It's worth to note that just after breeding, most ibis from Tamri region move to the limits of Souss-Massa National Park. In 2012 this displacement occurred even before, due to the failure of breeding at Tamri (Figure 4).


Figure 4: Monitoring of NBI numbers between 2011 and 2013

SMNP role is essential for the survival of the species. 

IV. Conclusion

NBI had a good breeding season, with a record of 113 breeding pairs, 148 fledglings and a rate of 1,3 fledgling/nest.
After this breeding season, the whole population at Souss-Massa region  has been evaluated at 443. 


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