Is the recent Cap Roux Marine Protected Area (France, Var) an efficient tool to sustain professional...
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Transcript of Is the recent Cap Roux Marine Protected Area (France, Var) an efficient tool to sustain professional...
Is the recent Cap Roux Marine Protected Area (France, Var) an efficient tool to sustain professional fisheries ?
8e Forum halieumétrique, La Rochelle, juin 2007
Catherine Seytre, Patrice Francour
EA 3156 « Gestion de la Biodiversité »
Université de Nice-Sophia Antipolis
The Cap Roux Marine Protected Area
Initiated by professional fishermen
Management tool
The Cap Roux Marine Protected Area
- Protected since 2004
- 450 ha
- Habitats available
Monitoring objectives
Beginning of Reserve Effect Effect of MPA on professional fishermen activities
Methods
Experimental net fishing
Underwater visual censuses : Fish Ecological Index (FEI)
Sampling method of fish assemblages : Experimental net fishing
PrinciplePrinciple:
Net fishing carried out by a professional fisherman Standardisation of fishing tools
Calculation:Calculation:
Biomass Species number
Advantages:Advantages:
Assessment of reserve effect on profesionnal fishermen activities
Complements UVC
Sampling method of fish assemblages : FEI
PrinciplePrinciple: 6 censuses Presence / absence of target species Size class (small/medium vs large)
CalculationCalculation: Relative species richness Mean Index Cumulative Index Coefficient of Variation
Bio-indicatorBio-indicator: Easy and quick to implement Results pertinence: highlights fishing and spearfishing pressure
Results
Experimental Experimental net fishing:net fishing:
Autumn 2006Autumn 2006
1,5 kg / 6 species1,5 kg / 6 species
9 kg / 9 species9 kg / 9 species
2,4 kg / 4 species2,4 kg / 4 species
Results
Relative species richness:Relative species richness:
10
12
14
16
18
20
Winter05
Spring05
Autumn05
Winter06
Autumn06
Winter07
Spring07
Rel
ativ
e sp
ecie
s ric
hnes
s
Inside Reserve
Outside North
Outside South
Little difference IR / OR
IR values more constant
Results
MeanMean IndexIndex:
5
15
25
35
45
Winter05
Spring05
Autumn05
Winter06
Autumn06
Winter07
Spring07
Mea
n In
dex
(%)
Inside Reserve
Outside North
Outside South
Little difference (OR/IR) except in autumn 2005
Poaching in 2006?
Results
Cumulative Index:Cumulative Index:
15
25
35
45
55
Winter05
Spring05
Autumn05
Winter06
Autumn06
Winter07
Spring07
Cum
ulat
ive
Inde
x (%
)
Inside Reserve
Outside North
Outside South
IR values > OR
IR values more constant
Important seasonal fluctuations OR
Results
Coefficient of variation:Coefficient of variation:
0
10
20
30
40
50
60
Winter05
Spring05
Autumn05
Winter06
Autumn06
Winter07
Spring07
CV
(%
) Inside Reserve
Outside North
Outside South
Higher CVs IR high variability
Assemblages stabler OR
Conclusion
FEI in the MPAFEI in the MPA Mean index similar Higher Cumulative index Higher Coefficient of variation Species Richness less variable
Experimental fishingExperimental fishing Biomass and Specific Richness are higher
Preliminary study of a recent Marine Protected Preliminary study of a recent Marine Protected AreaArea
First stage of the reserve effect
Results of FEI in 2006: due to poaching?
Inside the MPA, the fish assemblage has become more abundant, but is still over dispersed
Conclusion
Preliminary study of a recent Marine Protected Preliminary study of a recent Marine Protected AreaArea
• FEI - species list adapted to small scale fisheries
- noticeable method to detect early reserve effect
• FEI (UVC) and Experimental Fishing: two complementary methods
• Professional Fishermen implication: the best way to ensure MPA success in the future
• MPA dynamic: within 3 years, a reserve effect