A novel integrative approach elucidates fine-scale dispersal patchiness in marine populations
Schunter, C. (The University of Hong Kong. Swire Institute of Marine Science)
Pascual, Marta (Universitat de Barcelona. Departament de Genètica, Microbiologia i Estadística)
Raventos, N. (Laboratorio de Analisis de Estructuras Biologicas de Crecimiento)
Garriga, Joan (Centre d'Estudis Avançats de Blanes)
Garza, J. C. (National Marine Fisheries Service and University of California. Southwest Fisheries Science Center)
Bartumeus, Frederic (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Macpherson, E. (Centre d'Estudis Avançats de Blanes)

Data:	2019
Resum:	Dispersal is one of the main determining factors of population structure. In the marine habitat, well-connected populations with large numbers of reproducing individuals are common but even so population structure can exist on a small-scale. Variation in dispersal patterns between populations or over time is often associated to geographic distance or changing oceanographic barriers. Consequently, detecting structure and variation in dispersal on a fine-scale within marine populations still remains a challenge. Here we propose and use a novel approach of combining a clustering model, early-life history trait information from fish otoliths, spatial coordinates and genetic markers to detect very fine-scale dispersal patterns. We collected 1573 individuals (946 adults and 627 juveniles) of the black-faced blenny across a small-scale (2 km) coastline as well as at a larger-scale area (<50 kms). A total of 178 single nucleotide polymorphism markers were used to evaluate relatedness patterns within this well-connected population. In our clustering models we categorized SHORT-range dispersers to be potential local recruits based on their high relatedness within and low relatedness towards other spatial clusters. Local retention and/or dispersal of this potential local recruitment varied across the 2 km coastline with higher frequency of SHORT-range dispersers towards the southwest of the area for adults. An inverse pattern was found for juveniles, showing an increase of SHORT-range dispersers towards the northeast. As we rule out selective movement and mortality from one year to the next, this pattern reveals a complex but not full genetic mixing, and variability in coastal circulation is most likely the main driver of this fine-scale chaotic genetic patchiness within this otherwise homogeneous population. When focusing on the patterns within one recruitment season, we found large differences in temperatures (from approx. 17 °C to 25 °C) as well as pelagic larval duration (PLD) for juveniles from the beginning of the season and the end of the season. We were able to detect fine-scale differences in LONG-range juvenile dispersers, representing distant migrants, depending on whether they were born at the beginning of the season with a longer PLD, or at the end of the reproductive season. The ability to detect such fine-scale dispersal patchiness will aid in our understanding of the underlying mechanisms of population structuring and chaotic patchiness in a wide range of species even with high potential dispersal abilities.
Ajuts:	Agencia Estatal de Investigación CTM2017-88080 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-1120 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-378
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Population dynamics ; Molecular ecology
Publicat a:	Scientific reports, Vol. 9 (July 2019) , art. 10796, ISSN 2045-2322

DOI: 10.1038/s41598-019-47200-w
PMID: 31346216

10 p, 1.8 MB

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