Green turtles in the Gulf of Venezuela
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1 Green turtles in the Gulf of Venezuela Gaby Montiel-Villalobos Kate Rodríguez-Clark Hector Barrios-Garrido Alberto Abreu-Grobois, Rodrigo Lazo WIDECAST AGM Baltimore, MD February 2, 2013 Instituto Venezolano de Investigaciones Científicas Ecology Center. IVIC G. Guida Caracas. Research serving national needs. Rodríguez-Clark 2012 Inparques 1
2 My research I. Zager G. Guida G. Hoffman N. Ceballos-Mago Conservation biology broadly, conservation genetics specifically. Common thread: Venezuelan species threatened by over-exploitation. Turtles, alas, included. Gaby Overview of PhD finished last fall 2
3 The Gulf of Venezuela (GV) GV Maracaibo Lake Chelonia mydas in the GV Most important feeding area in Venezuela? Many turtles, many sizes. Wuayuú traditional use. Some tag recaptures. Justin McCaul Photos: M.G. Montiel-Villalobos; H. Barrios-Garrido M.Montiel-Villalobos 3
4 Questions 1. Importance as a feeding area? 2. Relative turtle abundance and factors influencing it? 3. Size structure? 4. Impacts of harvest: - Selectivity? - Origins of turtles harvested? M.Montiel-Villalobos Study area: High Extraction Zone Colombia HEZ 397 km 2 Gulf of Venezuela Carcasses (81%) Indigenous ports (7/12) Markets (4/6) Permanent nets (20) Depth 10 m 15 m Photos: M.G. Montiel-Villalobos; H. Barrios-Garrido; P. Barboza; N. Wildermman. 4
5 1. Food availability for C. mydas 410 points. X, Y, Z, type, nets. Colombia HEZ Gulf of Venezuela Sponges, algae & coral reef 38 km 2 Seagrasses 226 km 2 Photos: H. Barrios-Garrido; N. Espinoza 2. Index turtle abundance (CPUE) 52 bouts, km-net*hr CPUE = c/( lt). Two estimates. CPUE total = 1.21 ± 0.21 tu/km-net*hr P = 0.01 Photos: M.Montiel-Villalobos; H. Barrios-Garrido Brabeck y Nava 2009; Campbell 2003; Schmid 1998; Coyne 1994; Collazo et al. 1992; Mendonça y Ehrhart
6 3. Size class structure Live turtles (n = 16; 63.9 ± 5.1 cm) Carcasses (n = 287; 63.4 ± 0.9 cm) Number of turtles Juveniles cm Subadults cm Adults > 95 cm Size class (CCLmin, cm) Photos: H. Barrios-Garrido; N. Espinoza Campbell 2003; Bjorndal y Bolten Total annual catch & effort Interviews: 37 fishers. Observations: 38 bouts (20 interviewees). # fishers = 103. # nets = 264 interv. vs. 142 obs. CPUE i = 0.07 turtle/km-net*hr. CPUE o = Total effort = 44,595 km-net*hr Annual total catch 3,649 tu/y vs.11,000 tu/y HEZ-Nicaragua 6,000 tu/y Colombia Photos: M.G. Montiel-Villalobos; H. Barrios-Garrido 6
7 4. Catch selectivity 384 carcasses, 64% juveniles. 31 captures 65% juveniles. Not selective. Contrast with Colombia and Nicaragua. Size class (CCLmin, cm) 4. Geographic origins - tags 33 tags Adult females from Costa Rica, Colombia and Aves Island. Juveniles from several Caribbean feeding areas. 7
8 4. Geographic origins - mtdna 142 sequences. 486 bp mtdna control region. 10 haplotypes (CM- A3>20% & CM-A5>60%) Foraging-group centric mixed stock analysis (ACCSTR). Juveniles vs subadults & adults (CCLmin 80 cm). Proetti et al. 2012; Monzón-Argüello et al. 2010; Bolker et al. 2007; Naro- Maciel et al. 2007; Bass et al. 2006; Luke et al. 2004; Bass y Witzell 2000; Bass et al. 1998; Lahanas et al. 1998; 4. Origins - juveniles Major factor: colony size. Basin-wide mixing. 8% 6% other colonies 8% 78% 8
9 4. Origins sub/adults Another factor: distance? Progressive Hypothesized philopatry? routes 6% other colonies Conclusions 1. Large area of food resources. 2. Among highest CPUE reported for Caribbean. 3. Unusual mix of juveniles, subadults, adults. 4. Harvest third largest in region, sustainability unknown, but: - No evidence for selectivity. - Mostly juveniles, mostly from Costa Rica. - Adults from Aves Island? More work. 9
10 Thanks 10
11 2. Turtle capture probability Turtle capture probability Months Depth (m) Prediction Loess best fit Traditional knowledge Distance to midpoint seagrass patch (km) Distance to midpoint coral/sponge patch (km) Distance to artisanal net (km) 4. Catch selectivity & origin CCLmin (turtles caught, carcasses) Tags obtained opportunistically: method, date & place of capture. Outcome (consumed, sold, released). Photos: H. Barrios-Garrido 11
12 Total annual catch & capture effort 37 Interviews Fishing bouts CPUEi = Ci/(Ei*hi) Ci = captures/month Ei = # net-km hi = net-h/month N tio = N f * h itotal * CPUEo * 12 E t = N f * h itotal * E o CPUEo = Co/(Eo*ho) Co= captures/fisher Eo = net-km/fisher ho = net-h/fisher Photos: M.G. Montiel-Villalobos; H. Barrios-Garrido Conservation 1) Caribbean context: smaller problem? 2) Aves Island rookery: national issue Government decree No (1996) Rodríguez y Rojas-Suárez
13 Next steps - Sustentabilidad de la extracción en la ZME-GV: monitorización Datos históricos Percepción Wayuú No. absoluto menor No selectividad CPUE temp. Estable - Análisis genéticos: genoma mitocondrial completo - Distinción nuevos haplotipos dentro de más comunes (CM-A3 y CM-A5). Poco diferenciados: I.Av y Sur. Fl. CM-A3 I. Av CM-A5 Mx. CR Sur. Now Next 13
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