Distribución de etapas tempranas de tres especies de engráulidos en la costa ecuatoriana durante noviembre del 2018
Fecha
2019
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Facultad de Ciencias Naturales. Universidad de Guayaquil
Resumen
El presente estudio analiza la relación entre las variables ambientales y la distribución
de los diferentes estadios tempranos de Cetengraulis mysticetus y Engarulis ringens y
Anchoa spp. en la costa ecuatoriana, durante noviembre del 2018. Se colectaron
muestras de ictioplancton provenientes de 36 estaciones oceanográficas obtenidas por
arrastre superficial con redes de tipo Bongo de 300 micras; además, se caracterizaron
las condiciones ambientales por medio de datos físicos, químicos y biológicos. Se
determinó la abundancia de cada especie por estadio de desarrollo y se estableció su
relación con las variables ambientales y biológicas mediante el Análisis de
Correspondencia Canónica (CCA). Los resultados obtenidos evidencian una marcada
segregación ontogénica en cada estadío de desarrollo, lo que sugiere que las zonas de
desove de engráulidos responden a características ambientales favorables; mientras
que, la disponibilidad de alimento determina la distribución de los estadíos de flexión y
postflexión.
The present study analyzes the relationship between environmental variables and the distribution of different early stages of Cetengraulis mysticetus, Engraulis ringens and Anchoa spp. on the Ecuadorian coast during November 2018. Ichthyoplankton samples were collected from 36 oceanographic stations obtained by surface trawling with 300 micron Bongo-type nets. In addition, environmental conditions were characterized by physical, chemical and biological data. The abundance of each species was determined by stage of development and its relationship with environmental and biological variables was established by the Canonical Correspondence Analysis (CCA). The results obtained showed a marked ontogenetic segregation, suggesting that the spawning areas of engraulids respond to favorable environmental characteristics; while, the availability of food determines the distribution of the stages of flexion and postflextion.
The present study analyzes the relationship between environmental variables and the distribution of different early stages of Cetengraulis mysticetus, Engraulis ringens and Anchoa spp. on the Ecuadorian coast during November 2018. Ichthyoplankton samples were collected from 36 oceanographic stations obtained by surface trawling with 300 micron Bongo-type nets. In addition, environmental conditions were characterized by physical, chemical and biological data. The abundance of each species was determined by stage of development and its relationship with environmental and biological variables was established by the Canonical Correspondence Analysis (CCA). The results obtained showed a marked ontogenetic segregation, suggesting that the spawning areas of engraulids respond to favorable environmental characteristics; while, the availability of food determines the distribution of the stages of flexion and postflextion.
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ICTIOPLANCTON, ENGRAULIDAE, SEGREGACIÓN ONTOGÉNICA, ABUNDANCIA, ZONAS DE DESOVE