Foraging behavior association between Irrawaddy dolphins (Orcaella brevirostris) and tidal not fisheries in the coastal waters of Pulupandan, Negros Occidental, Philippines
2016
Casipe, K.P. | Espinosa, K.E.S. | Jarabelo, C.J.M. | dela Paz, M.E.L.
The coastal waters of Pulupandan, Negros Occidental [Philippines] has been known to be a core feeding area for a small population of endangered Irrawaddy dolphins, which have been observed foraging within close proximity to permanent tidal nets used by locals. Foraging behavior and interactions with tidal nets were observed during a series of boat-based surveys from April to September 2015. Foraging behavior was classified based on proximity to the tidal nets: net (0 50 m) and open water ( 50 m) foraging. Specific preference for any of the tidal nets was measured using Coefficient for Area Use. Catch per Unit Effort (CPUE) was obtained to determine the productivity of each tidal net. The total time spent foraging in open water did not prove to be significantly different from the time spent foraging in tidal nets (alpha = 0.05), suggesting minimal differences between these areas. There was no significant difference in the CPUE in all 6 tidal nets. However, dolphins appeared to prefer one specific tidal net, having significantly (alpha = 0.05) spent more time engaging in net foraging than in other nets. Pearson Correlation Coefficient showed significant relationship between net foraging and CPUE.
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