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El Nino Southern Oscillation (ENSO) impact on tuna fisheries in Indian Ocean

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Relation http://eprints.cmfri.org.in/10393/
http://www.springerplus.com/content/3/1/591
 
Title El Nino Southern Oscillation (ENSO) impact on tuna fisheries in Indian Ocean
 
Creator Satheeshkumar, P
Pillai, N G K
Manjusha, U
 
Subject Tuna fisheries
Climate change
 
Description El Nino Southern Oscillation (ENSO) is an important driver of interannual variations in climate and ecosystem
productivity in tropical regions. However, detailed information about this important phenomenon of the Indian
Ocean is scarce. Consequently, the objective of this study is to improve understanding of the impact of warm event
El Nino and cool event La Nina on annual tuna landings from the Indian Ocean from 1980 to 2010. In this study,
maximum tuna landings were recorded during a weak El Nino year (1456054 t in 2006) and during a weak La Nina
year (1243562 t in 2000), although the lowest tuna catch was followed during the strong El Nino year (1204119 t in
2009) and during a strong La Nina year (706546 t in 1988). Validation of predicted tuna landings and SST were
showing a significant positive correlation (p < 0.01) was observed all the major tuna species except Southern Bluefin
Tuna. Whereas the other relationships such as sea level pressure, Wind actions; Zonal Wind (U), Meridonial Wind (V),
and Scalar Wind (W) are less well-defined. In contrast with principal component analysis we find that Principal
Components 1 explains 75.5% of the total variance and suggest that sea surface temperature plays a major role
in determining tuna availability in the region especially during warm event El Nino years; landings in Indian Ocean
tend to be optimum SST 25 to 26°C in ENSO event. Our results confirm the ENSO impact on climate, tuna abundance
and production in the Indian Ocean. However, among the oceanic variables SST explained the highest deviance in
generalized additive models and therefore considered the best habitat predictor in the Indian Ocean followed by
sea level pressure and Winds (U, V, W).
 
Publisher Springer
 
Date 2014
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/10393/1/El_Nino_Southern_Oscillation_%28ENSO%29_impact_on_tuna_fisheries_in_Indian_Ocean.pdf
Satheeshkumar, P and Pillai, N G K and Manjusha, U (2014) El Nino Southern Oscillation (ENSO) impact on tuna fisheries in Indian Ocean. SpringerPlus, 3 (591). pp. 1-13.