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Datasets of project "Climate variability and El Niño Southern Oscillation"

Mostrando recursos 1 - 20 de 3.788

  1. Gametogenic cycle of Mesodesma donacium

    Riascos, José M; Carstensen, Daniel; Laudien, Jürgen; Arntz, Wolf E; Oliva, Marcelo; Güntner, Andreas; Heilmayer, Olaf
    Large-scale environmental patterns in the Humboldt Current System (HCS) show major changes during strong El Niño episodes, leading to the mass mortality of dominant species in coastal ecosystems. Here we explore how these changes affect the life-history traits of the surf clam Mesodesma donacium. Growth and mortality rates under normal temperature and salinity were compared to those under anomalous (El Niño) higher temperature and reduced salinity. Moreover, the reproductive spatial-temporal patterns along the distribution range were studied, and their relationship to large-scale environmental variability was assessed. M. donacium is highly sensitive to temperature changes, supporting the hypothesis of temperature as...

  2. Gametogenic cycle of Mesodesma donacium in Peñuelas, Chile, June 1994 to July 1995

    Jerez, Gabriel; Aris, Luis; Brown, Donald; Roa, Ruben; Miranda, Hernán P

  3. Model parameter

    Taylor, Marc H; Wolff, Matthias; Vadas, Flora; Yamashiro, Carmen
    Interannual environmental variability in Peru is dominated by the El Niño Southern Oscillation (ENSO). The most dramatic changes are associated with the warm El Niño (EN) phase (opposite the cold La Niña phase), which disrupts the normal coastal upwelling and affects the dynamics of many coastal marine and terrestrial resources. This study presents a trophic model for Sechura Bay, located at the northern extension of the Peruvian upwelling system, where ENSO-induced environmental variability is most extreme. Using an initial steady-state model for the year 1996, we explore the dynamics of the ecosystem through the year 2003 (including the strong EN...

  4. Carbon cycling in the northern Humboldt Current off Chile

    González, Humberto E; Giesecke, R; Vargas, C A; Pavez, M; Iriarte, J L; Santibañez, P; Castro, L; Escribano, Rubén; Pagés, F
    The structure of the zooplankton foodweb and their dominant carbon fluxes were studied in the upwelling system off northern Chile (Mejillones Bay; 23°S) between October 2000 and December 2002. High primary production (PP) rates (18 gC/m**2 d) were mostly due to the net-phytoplankton size fraction (>23 µm). High PP has been traditionally associated with the wind-driven upwelling fertilizing effect of equatorial subsurface waters, which favour development of a short food chain dominated by a few small clupeiform fish species. The objective of the present work was to study the trophic carbon flow through the first step of this 'classical chain'...

  5. Epibiosis between the sand crab Emerita analoga and the mussel Semimytilus algosus

    Villegas, Mario J; Stotz, Wolfgang; Laudien, Jürgen
    Coastal zones of the Humboldt Current Upwelling System (HCUS) are composed both of rocky and sandy beaches inhabited by macrozoobenthic communities. These show oscillating changes in the dominance of species; the abundance of the sand crab Emerita analoga is linked to phases of the El Niño Southern Oscillation (ENSO). The biogenic surfaces of these crabs serve as substrate for opportunistic colonizers. This study is the first record of an epibiosis between E. analoga and the rock mussel Semimytilus algosus, detected at a southern Peruvian sandy beach. Mussels fouled a wide size-range of adult E. analoga (7.3%) but they themselves belonged...

  6. Hydrochemistry of CTD MPI_0504_4

    Graco, Michelle; Gutièrrez, Dimitri

  7. Hydrochemistry of CTD MPI_0504_3

    Gutièrrez, Dimitri

  8. Hydrochemistry of CTD MPI_0504_2

    Graco, Michelle

  9. Hydrochemistry of CTD Callao_0512_4

    Graco, Michelle; Gutièrrez, Dimitri

  10. Hydrochemistry of CTD Callao_0512_3

    Gutièrrez, Dimitri

  11. Hydrochemistry of CTD Callao_0512_2

    Graco, Michelle; Gutièrrez, Dimitri

  12. Hydrochemistry of CTD Callao_0511_3

    Graco, Michelle; Gutièrrez, Dimitri

  13. Hydrochemistry of CTD Callao_0511_2

    Graco, Michelle; Gutièrrez, Dimitri

  14. Hydrochemistry of CTD Callao_0508_4

    Graco, Michelle; Gutièrrez, Dimitri

  15. Hydrochemistry of CTD Callao_0508_3

    Graco, Michelle; Gutièrrez, Dimitri

  16. Hydrochemistry of CTD Callao_0508_2

    Graco, Michelle; Gutièrrez, Dimitri

  17. Hydrochemistry of CTD Callao_0507_4

    Graco, Michelle; Gutièrrez, Dimitri

  18. Hydrochemistry of CTD Callao_0507_3

    Graco, Michelle; Gutièrrez, Dimitri

  19. Hydrochemistry of CTD Callao_0507_2

    Graco, Michelle; Gutièrrez, Dimitri

  20. Hydrochemistry of CTD Callao_0502_4

    Graco, Michelle; Gutièrrez, Dimitri

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