Servizo de Planificacion

Santiago de Compostela, Spain

Servizo de Planificacion

Santiago de Compostela, Spain
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Alonso-Fernandez A.,CSIC - Institute of Marine Research | Otero J.,CSIC - Institute of Marine Research | Banon R.,CSIC - Institute of Marine Research | Campelos J.M.,Servizo de Planificacion | And 3 more authors.
Hydrobiologia | Year: 2017

Sex ratio is a fundamental demographic parameter with major implications for the dynamics, management, and conservation of animal populations. The objective was to study the main factors affecting the post-settlement population sex ratio (SR) of Octopus vulgaris off the NE Atlantic. We investigated the spatio-temporal dynamics in SR using more than 115,000 individual records obtained from onboard observers over a 14-year period. Generalized linear models were used to evaluate the abiotic and biotic factors affecting the variation in SR. The probability of catching a female decreased with size. Seasonal differences in SR resulted in a female-biased ratio in autumn and male dominance in summer. SR also varied along the bathymetric gradient with larger female proportion at deeper waters in winter and spring. The probability of catching a female was lower in hard substrates mainly in summer. Upwelling intensity and sea surface temperature did not show substantial effects on SR. The analysis neither revealed an influence of local density on SR. The spatio-temporal patterns of SR in O. vulgaris are likely based on differences in sexual behavior and life history which may affect catchability rates. Understanding the causes in SR patterns will provide valuable knowledge for future assessment and management plans. © 2016, Springer International Publishing Switzerland.

Villegas-Rios D.,CSIC - Institute of Marine Research | Alonso-Fernandez A.,CSIC - Institute of Marine Research | Fabeiro M.,CSIC - Institute of Marine Research | Banon R.,Servizo de Planificacion | And 2 more authors.
PLoS ONE | Year: 2013

Fish populations are often treated as homogeneous units in typical fishery management, thereby tacitly ignoring potential intraspecific variation which can lead to imprecise management rules. However, intraspecific variation in life-history traits is widespread and related to a variety of factors. We investigated the comparative age-based demography of the two main colour patterns of Labrus bergylta (plain and spotted, which coexist in sympatry), a commercially valuable resource in the NE Atlantic. Individuals were aged based on otolith readings after validating the annual periodicity of annuli deposition. The relationships between the otolith weight and fish age and between otolith length and fish length were strong but differed between colour patterns. The fit of the growth models to the age and length data resulted in divergent growth curves between colour morphotypes and between sexes. Males and spotted individuals attained larger mean asymptotic sizes (Linf) than females and plain individuals, respectively, but converged to them more slowly (smaller k). Estimates of mortality based on catch curves from two independent datasets provided a global total mortality (Z) of 0.35 yr-1, although Z was larger in plain and female individuals. Overall, the results of this research have direct implications for management of L. bergylta and, as a precautionary measure, we recommend considering both colour patterns as two different management units. © 2013 Villegas-Ríos et al.

Villegas-Rios D.,CSIC - Institute of Marine Research | Villegas-Rios D.,Norwegian Institute of Marine Research | Alos J.,Leibniz Institute of Freshwater Ecology and Inland Fisheries | Palmer M.,CSIC - Mediterranean Institute for Advanced Studies | And 4 more authors.
Marine Ecology Progress Series | Year: 2014

Catchability, a key parameter in stock assessment, is often considered constant in time and space. However, when fishing with passive gears like traps or gillnets, fish behavior determines the odds of encounter with the fishers and thus catchability. Few studies have presented comprehensive empirical evidence of the link between behavior measured in the wild and catchability from a life-history strategy perspective. Here, a suite of different variables, including environmental cues, physiological states, fish activity, home range and catchability, were modeled using a sinusoidal function to describe their seasonality over the year and the degree of coupling among them in a sedentary coastal fish (Labrus bergylta). All the variables except the home range size showed a significant variation over the year, following a sinusoidal pattern. The models showed a tight match between the seasonality of catchability and fish activity, with high values of both variables occurring in late spring to early summer, when the highest levels of feeding and the period of reproductive inactivity occurred. Lower catchability values were predicted in late autumn to early winter, coinciding with the spawning season and the associated reduced activity. This integrative research shows that the spatio-temporal dimension of fish life-history strategy has a key role in shaping catchability even in highly sedentary species. Time-varying catchability needs to be incorporated into stock assessment models that aim to accurately describe fish population health and to estimate abundance indices. © Inter-Research 2014.

Banon R.,Servizo de Planificacion | Villegas-Rios D.,CSIC - Institute of Marine Research | Serrano A.,C.O. de Santander | Mucientes G.,CSIC - Institute of Marine Research | And 2 more authors.
Zootaxa | Year: 2010

An annotated checklist of the marine fishes from Galician waters is presented. The list is based on historical both literature records and on new revisions. The ichthyofauna list is composed by 398 species. It is diversified in 2 superclasses, 3 class, 35 orders, 139 families and 288 genuses. Perciformes is the most diverse order with 37 families, 91 genus and 136 species. Gobiidae (19 species) and Sparidae (19 species) are the richest families. Biogeographically, the Lusitanian is the most important group including 204 species (51.3%), followed by the Atlantic group with 149 species (37.4%), the Boreal group with 28 species (7%) and the 17 species (4.3%) of the African group. A total of 42 species have been included as new records for the study area, and 3 records have been identified as doubtful. Identification and registration of errors from previous studies have been also indicated. © 2010 Magnolia Press.

Banon R.,Servizo de Planificacion | Arronte J.C.,C.O. de Santander | Vazquez-Dorado S.,University of Vigo | Del Rio J.L.,C.O. de Vigo | de Carlos A.,University of Vigo
Molecular Ecology Resources | Year: 2013

DNA sequences of cytochrome c oxidase I gene (COI) from Lepidion spp. were employed to test the efficiency of species identification. A sample of 32 individuals from five Lepidion species was sequenced and combined with 26 sequences from other BOLD projects. As a result, 58 Lepidion DNA sequences of the COI gene belonging to eight of the nine recognized Lepidion species were analysed. Sequences were aligned and formed seven clades in a Bayesian phylogenetic tree, where Lepidion lepidion and Lepidion eques grouped jointly. The Kimura 2-parameter genetic distances, among congeners were, on average, 4.28%, 16 times greater than among conspecifics (0.27%). The main diagnostic meristic data of Lepidion spp. were compiled and a detailed morphological revision of the congeneric species L. eques and L. lepidion was made. The eye diameter was significantly different between L. eques and L. lepidion (P < 0.001). The number of anal fin rays ranged from 45 to 51 in L. lepidion and from 47 to 54 in L. eques, but no significant differences were obtained in the mean values of this variable (P = 0.07). According to the morphological and genetic analyses, the results strongly suggest that the Mediterranean codling L. lepidion and the North Atlantic codling L. eques are conspecific, making L. eques a junior synonym of L. lepidion. © 2012 Blackwell Publishing Ltd.

PubMed | University of Vigo, Servizo de Planificacion and C.O. de Santander
Type: | Journal: Zootaxa | Year: 2014

From 2009 to 2011 eleven specimens belonging to four bathygadid species of the family Bathygadidae were captured in two different locations in the northern waters of Spain. The morphometric measurements and meristic characters of these specimens are given. The specimens were identified as belonging to the genera Gadomus Regan, 1903, and Bathygadus Gnther, 1878, including the following species: Gadomus dispar (Vaillant, 1888), Gadomus longifilis (Goode & Bean, 1885), Gadomus arcuatus (Goode & Bean, 1886) and Bathygadus melanobranchus Vaillant, 1888. As a result, a new northern limit of distribution of G. arcuatus from the northeastern Atlantic is reported. The first molecular identification and genetic interrelationships of Bathygadidae species, based on the mitochondrial COI nucleotide sequences -DNA barcodes- is reported. Sequences corresponding to specimens from the same species were identical and the overall mean genetic diversity (uncorrected p-distance) was 0.096 0.008. Based on a morphological and meristic examination of the specimens, as well as on the available literature, an updated key of the members of the family Bathygadidae from the north-eastern Atlantic Ocean is provided.

PubMed | FARO, Servizo de Planificacion and C.O. de Santander
Type: Journal Article | Journal: Zootaxa | Year: 2016

A commented checklist containing 139 species of marine fishes recorded at the Galician Bank seamount is presented. The list is based on nine prospecting and research surveys carried out from 1980 to 2011 with different fishing gears. The ichthyofauna list is diversified in 2 superclasses, 3 classes, 20 orders, 62 families and 113 genera. The largest family is Macrouridae, with 9 species, followed by Moridae, Stomiidae and Sternoptychidae with 7 species each. The trachichthyd Hoplostethus mediterraneus and the morid Lepidion lepidion were the most abundant species. Biogeographically, the Atlantic group, with 113 species (81.3%) is the best represented, followed by the Lusitanian one with 17 species (12.2%). Data on species abundance, as number of individuals caught, size and depth are reported. Habitat, distribution and vulnerability status are commented. Moreover, biometric data and meristic counts are also reported for several species. The results obtained showing a high fish biodiversity and a sensible number of threatened species, strongly support the future declaration of the Galicia Bank as a Marine Protected Area.

Tasende M.G.,Servizo de Planificacion | Cid M.,CSIC - Institute of Agricultural Sciences | Fraga M.I.,University of Santiago de Compostela
Journal of Applied Phycology | Year: 2012

Qualitative and quantitative differences in carrageenan composition of gametophytes and tetrasporophytes of Chondrus crispus were observed in this study. Carrageenans in gametophytes belong to the kappa family (κ-, ι-, ν- and μ-carrageenan). The dominant fractions were κ- and ι-carrageenan (more than 50% of the total carrageenans). In tetrasporophytes, the presence of λ-carrageenan was confirmed. Carrageenan content in gametophytes (37. 4 ± 1. 68% DW) was higher than in tetrasporophytes (29. 13 ± 0. 76% DW). Spatial and temporal variation in carrageenan content in both life cycle phases appears to be related mainly to seawater and air temperatures, insolation, water movement and desiccation. The highest values of carrageenan content were recorded in those localities where higher values of precipitation, wind speed or water movement occurred. A bimodal temporal pattern on carrageenan content was observed. Fronds showed a high carrageenan content in spring and autumn. During these seasons, the content was over 40% in gametophytes and 30% in the tetrasporophytes. In summer and winter, these values down in both life cycle phases below 30%. In general the highest carrageenan contents were related to highest seawater temperatures. On the contrary, high air temperature and high insolation appeared to be unfavourable for carrageenan production. GLM models were obtained to predict carrageenan production from natural C. crispus populations, along Galician coast. © 2011 Springer Science+Business Media B.V.

Rodriguez-Cabello C.,Spanish Institute of Oceanography | Perez M.,Spanish Institute of Oceanography | Banon R.,Servizo de Planificacion
Journal of Applied Ichthyology | Year: 2014

The aim of this study was to identify some of the Apristurus species by combining morphometric and genetic tools. Several specimens of the genus Apristurus were caught on the Galicia Bank Seamount (NE Atlantic), between 1460 and 1809 m depths, during a multidisciplinary survey carried out in 2011 within the framework of the INDEMARES Project. Morphometric and genetic analyses were conducted to aid the identification of the specimens collected. A total of 20 specimens were identified, of which 18 corresponded to Apristurus aphyodes (Nakaya and Stehmann, 1998), one to A. profundorum (Goode and Bean, 1896) and one to A. melanoasper Iglesias, Nakaya&Stehmann, 2004. Genetic results based on the mtDNA COI sequences (682-690 bp fragment of the COI gene) support the identification of A. profundorum and A. melanoasper, with a bootstrap of 99 and 96%, respectively. The identification of A. aphyodes was also performed using a 499 bp fragment of the 16S mitochondrial gene. These are the first records of the Apristurus species from Galician waters, which extends their known area of distribution and provides more information on different biological and ecological aspects of this complex taxonomic group. © 2014 Blackwell Verlag GmbH.

Aneiros F.,University of Vigo | Rubal M.,University of Vigo | Rubal M.,University of Porto | Troncoso J.S.,University of Vigo | Banon R.,Servizo de Planificacion
Continental Shelf Research | Year: 2015

The Ría de Vigo is a semi-enclosed bay with high primary productivity due to the influence of coastal upwelling-downwelling dynamics. The area is heavily populated and affected by numerous human activities, which lead to sediment modification. Epibenthic megafauna from the non-estuarine zones of this bay has been studied in order to describe its spatial distribution, testing possible differences between inner and outer areas. With that purpose, 75 sites have been sampled by means of a towing dredge. Megafauna was identified to the lowest taxonomic level possible, and each taxon counted and weighted. 113 different taxa were identified and a high spatial heterogeneity was observed in terms of abundance, biomass, taxa richness, diversity and evenness. Suspension-feeding molluscs dominated the innermost part of the studied area, and were substituted by echinoderms towards the external zones; this spatial pattern was also reflected in the results of multivariate analyses. These shifts in taxonomic and trophic guild composition of the assemblages have been tentatively related to differences in pollution levels and primary productivity along the main axis of the bay. © 2015 Elsevier Ltd.

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