scholarly journals Effect of El Niño on the diet of a specialist seabird, Sula nebouxii, in the warm eastern tropical Pacific

2012 ◽  
Vol 462 ◽  
pp. 261-271 ◽  
Author(s):  
S Ancona ◽  
I Calixto-Albarrán ◽  
H Drummond
Keyword(s):  
El Niño ◽  
El Nino ◽  
Tropical Pacific ◽  
Eastern Tropical Pacific ◽  
Sula Nebouxii

scholarly journals The 2015-2016 El Niño increased infection parameters of copepods on Eastern Tropical Pacific dolphinfish populations

PLoS ONE ◽  
2020 ◽  
Vol 15 (5) ◽  
pp. e0232737
Author(s):  
Ana María Santana-Piñeros ◽  
Yanis Cruz-Quintana ◽  
Ana Luisa May-Tec ◽  
Geormery Mera-Loor ◽  
María Leopoldina Aguirre-Macedo ◽  
...  
Keyword(s):  
El Niño ◽  
El Nino ◽  
Tropical Pacific ◽  
Eastern Tropical Pacific ◽  
Infection Parameters

El Nino and little ice age effects on upwelling in the eastern tropical pacific

1988 ◽  
Vol 70 (1-2) ◽  
pp. 198
Author(s):  
C.T. Shen ◽  
R.B. Dunbar ◽  
M.W. Colgan ◽  
P.W. Glynn
Keyword(s):  
El Niño ◽  
Little Ice Age ◽  
El Nino ◽  
Tropical Pacific ◽  
Age Effects ◽  
Ice Age ◽  
Eastern Tropical Pacific

scholarly journals Reproduction of the blue-footed booby predicts commercial fish abundance in the eastern tropical Pacific

2013 ◽  
Vol 70 (6) ◽  
pp. 1263-1272
Author(s):  
Juan Meraz ◽  
Sergio Ancona ◽  
Cristina Rodríguez ◽  
Hugh Drummond
Keyword(s):  
El Niño ◽  
El Nino ◽  
Tropical Pacific ◽  
Fish Abundance ◽  
Sea Surface ◽  
Eastern Tropical Pacific ◽  
Prey Fish ◽  
Commercial Fish ◽  
Local Abundance ◽  
Two Factors

Abstract Meraz, J., Ancona, S., Rodríguez, C., and Drummond, H. 2013. Reproduction of the blue-footed booby predicts commercial fish abundance in the eastern tropical Pacific. – ICES Journal of Marine Science, 70: 1263–1272. To establish whether reproduction in a colony of the blue-footed booby in the eastern tropical Pacific predicts local abundance of prey fish several months later, 13 years of data were analysed. Eight reproductive variables assessed during the period of January–May, grouped in two factors, were related to commercial catches in the surrounding 6600 km2 area during the following June–December. The first factor explained 33% of interannual variance in fish captures per unit effort during June–December (future FCUE), and 63% when only El Niño years were considered. Also, the proportion of large clutches present on three single-day censuses in the spring explained 51, 46 and 35% of variance in future FCUE among all years, and 78, 85 and 82% of variance among El Niño years. In contrast, sea surface temperatures in March did not explain variance in future FCUE. Proportion of large clutches is a moderately good predictor of the abundance of commercial fish during the subsequent seven months and can be satisfactorily and cheaply measured on a single day.

scholarly journals Oceanic Rossby Waves over Eastern Tropical Pacific of Both Hemispheres Forced by Anomalous Surface Winds after Mature Phase of ENSO

2016 ◽  
Vol 46 (11) ◽  
pp. 3397-3414 ◽  
Author(s):  
Hiroto Abe ◽  
Youichi Tanimoto ◽  
Takuya Hasegawa ◽  
Naoto Ebuchi
Keyword(s):  
Rossby Wave ◽  
El Niño ◽  
Rossby Waves ◽  
El Nino ◽  
Tropical Pacific ◽  
Sea Surface ◽  
Eastern Coast ◽  
Eastern Tropical Pacific ◽  
Enso Events ◽  
Anomalous Surface

AbstractThe present study examined ENSO-related wind forcing contribution to off-equatorial Rossby wave formations in the eastern tropical regions of the North and South Pacific using satellite altimeter data and atmospheric reanalysis data during the period of 1993–2013. After mature phases of ENSO events, the sea surface height anomaly fields showed that off-equatorial Rossby waves propagated westward along 11°N and 8°S from the eastern Pacific. Starting longitudes of the westward propagation were distant from the eastern coast, especially for weak El Niño events in the 2000s, in contrast to the strong 1997/98 El Niño event in which the propagations started from the coast. Based on observational data, it was hypothesized that the Rossby waves could be formed by off-equatorial zonal belts of wind stress curl anomalies (WSCAs) in 135°–90°W rather than by wave emissions from the eastern coast. A numerical model forced only by WSCAs, that is, without wave emissions from the coast, successfully reproduced observed features of the Rossby waves in 180°–120°W, supporting the study’s hypothesis. During mature phases of El Niño events, equatorially symmetric negative sea level pressure anomalies (SLPAs) resulting from hydrostatic adjustment to the underlying warm sea surface temperature anomalies dominated over the eastern tropical Pacific. Anomalous surface easterlies blowing around the negative SLPA area as geostrophic winds were a major contributor in forming the anticyclonic WSCAs. The polarity of the anomalies is reversed during La Niña events. Therefore, spatial patterns of the SLPAs associated with the ENSO events are necessary to understand the Rossby wave formations.

scholarly journals Seasonal variability of copepod community structure and abundance modified by the El Niño-La Niña transition (2010) in the tropical Pacific off central Mexico

2018 ◽  
Vol 66 (4) ◽  
pp. 1449
Author(s):  
Eva R. Kozak ◽  
Aramis Olivos-Ortiz ◽  
Carmen Franco-Gordo ◽  
Gloria Pelayo-Martínez
Keyword(s):  
Community Structure ◽  
El Niño ◽  
Seasonal Variability ◽  
El Nino ◽  
Tropical Pacific ◽  
La Niña ◽  
Central Mexico ◽  
Eastern Tropical Pacific ◽  
La Nina ◽  
Mesoscale Processes

Seasonal variability of the community structure of copepods in the Eastern tropical Pacific off central Mexico was studied during three distinct hydrodynamic periods in 2010 using statistical and multivariate analyses. The survey period included the second half of the 2009-2010 El Niño (January), the neutral transition period (May-June), and the first half of the 2010-2011 La Niña (October). Seventy-eight copepod species were identified; richness ranged from 11 to 47 species per station, with seasonal averages from 25 species in May to 35 species in January. Cluster analysis indicated that there were four principal groups present across the surveyed periods, defined by January (El Niño), October (La Niña), May offshore stations, and May upwelling stations (cyclonic eddy and coastal stations). There were no significant differences in abundance, but the January (El Niño) cluster was most diverse with 32 species, May offshore and October (La Niña) clusters each had 25 species, and the May upwelling was the least diverse cluster with 18 species. Mesoscale processes were strongest during May, which was the only period with a significant inshore-offshore gradient of species richness and diversity. Canonical correspondence analysis (CCA) revealed that variability was primarily driven by subsurface (75-200 m) ammonium, and surface (0-50 m) temperature, nitrates+nitrites, salinity and phosphorus. Copepodites and adults of the primarily herbivorous Eucalanidae dominated the stations of the upwelling cluster, while copepodites and adults of the carnivorous Euchaetidae dominated the January (El Niño) station cluster. The higher Chl a levels during the less productive (reduced upwelling) El Niño period were probably due to reduced grazing activities and increased ammonium availability through increased zooplankton metabolism. The horizontal distribution of copepods in the Eastern Tropical Pacific off Mexico appears to be principally defined by mesoscale eddy processes (offshore) and upwelling (coastal). These mesoscale processes were affected by El Niño - La Niña transitions, which subsequently disrupted the inshore-offshore gradient and in the case of El Niño likely caused reductions in copepod abundance across the entire region which persisted for the entire study period, and possibly longer.

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