Pubblicazione scientifica

Testing spatial heterogeneity with stock assessment models

FILONE TECNOLOGICO	TEMA
economia circolare e sostenibilità	monitoraggio impatti climatici sostenibilità dell'ecosistema marino
produzione e cattura	attrezzi da pesca modalità di utilizzo delle reti/attrezzi da pesca sistemi di individuazione sottomarini (es. ecoscandaglio, ecc.)

RIASSUNTO

This paper describes a methodology that combines meta-population theory and stock assessment models to gain insights about spatial heterogeneity of the meta-population in an operational time frame. The methodology was tested with stochastic simulations for different degrees of connectivity between sub-populations and applied to two case studies, North Sea cod (Gadus morua) and Northeast Atlantic sardine (Sardina pilchardus). Considering that the biological components of a population can be partitioned into discrete spatial units, we extended this idea into a property of additivity of sub-population abundances. If the additivity results hold true for putative sub-populations, then assessment results based on sub-populations will provide information to develop and monitor the implementation of finer scale/local management. The simulation study confirmed that when sub-populations are independent and not too heterogeneous with regards to productivity, the sum of stock assessment model estimates of sub-populations’ SSB is similar to the SSB estimates of the meta-population. It also showed that a strong diffusion process can be detected and that the stronger the connection between SSB and recruitment, the better the diffusion process will be detected. On the other hand it showed that weak to moderate diffusion processes are not easy to identify and large differences between sub-populations productivities may be confounded with weak diffusion processes. The application to North Sea cod and Atlantic sardine exemplified how much insight can be gained. In both cases the results obtained were sufficiently robust to support the regional analysis.

DATA

Data di pubblicazione: 24/01/2018

AUTORI

JARDIM ERNESTO
EERO MARGIT
SILVA ALEXANDRA
ULRICH CLARA
PAWLOWSKI LIONEL
HOLMES STEVEN J
IBAIBARRIAGA LEIRE
DE OLIVEIRA JOSE A A
RIVEIRO ISABEL
ALZORRIZ NEKANE
CITORES LEIRE
SCOTT FINLAY
URIARTE ANDRES
CARRERA PABLO
DUHAMEL ERWAN
MOSQUEIRA IAGO

ENTE DI AFFERENZA

EUR COMMISSION JOINT RSCH CTR JRC
TECHNICAL UNIV DENMARK DTU AQUA NATL INST AQUATIC RESOURCES CHARLOTTENLUND DENMARK
INST PORTUGUES DO MAR E DA ATMOSFERA IPMA
IFREMER LAB DE TECH & BIOLOGIE HALIEUTIQUE
AZTI TECNALIA MARINE RSCH DIVISION TXATXARRAMENDI UGARTEA ZG 48395 SUKARRIETA BIZKAIA SPAIN
CTR ENVIRONMENT FISHERIES & AQUACULTURE SCIENCE CEFAS LOWESTOFT LAB
INST ESPANOL DE OCEANOGRAFIA IEO CTR OCEANOGRAFICO DE VIGO SUBIDA A RADIO FARO 50 36390 VIGO SPAIN
BCAM BASQUE CTR APPLIED MATHEMATICS MAZARREDO 14 E48009 BILBAO BASQUE COUNTRY SPAIN
AZTI TECNALIA MARINE RSCH DIVISION HERRERA KAIA PORTUALDEA ZG 20110 PASAIA GIPUZKOA SPAIN
ARISTOTLE UNIV THESSALONIKI GREECE

RIVISTA

PLoS ONE, 13(1), e0190791

IMPACT FACTOR

2,870

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