CESIMAR - CENPAT   25625
CENTRO PARA EL ESTUDIO DE SISTEMAS MARINOS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Larval dispersion of the commensal nemertean Malacobdella arrokeana in North Patagonics gulfs, Argentina
Autor/es:
TONINI MARIANO HERNAN; ALFAYA JOSÉ E.F.; BIGATTI GREGORIO ; PENCHASZADEH, PABLO E.
Lugar:
List auf Sylt
Reunión:
Conferencia; 9th International Conference on Nemertean Biology, Universidad de Bonn (AWI), List auf Sylt, Alemania; 2018
Institución organizadora:
Universidad de Bonn (AWI), List auf Sylt, Alemania
Resumen:
The nemertean Malacobdella arrokeana is a commensal of the edible giant bivalve Panopea abbreviata; both species have a restricted geographic distribution, high specificity and populations separated by natural barriers. This supposes a high genetic structuring among populations and low intra-populational variability; nevertheless, a lack of genetic structure was detected previously between M. arrokeana populations from Atlantic norpatagonic gulfs using mitochondrial and nuclear markers. Here, we present the first attempt to explain this lack of genetics structure, integrating larval behavior and bio-oceanographical model simulations (ROMS) which corroborate that the population genetic results are in concordance with particle dispersion model simulation. Cultured larvae obtained had a mean planktonic life of 30 days after fertilization. Larval morphology (planuliform) and behavior suggest that the dispersion is influenced by passive transport related to season and hydrodynamic diffusion patterns present in the area. Our results are useful to understand the dispersion and settlement of larvae along the north Patagonic gulfs and provides novel baseline data in larval connectivity and oceanographic circulation patterns.