Estudio preliminar sobre la biología de las poblaciones de Gelidium canariensis (Grunow) Seoane en Gran Canaria.

Se han realizado los trabajos preliminares sobre la biología de Gelidiam canariensis (Grunow) Seoane en tres localidades de la costa Norte de Gran Canaria, tipificando las distintas clases de talla y comparando las distintas poblaciones utilizando los parámetros biomasa y número de individuos por clase de talla.A preliminary study on the biology of Gelidium canariensis (Grunow) Seoane was made in three places on the North coast of Gran Canaria Island. We used four size classes making a between-population comparison using parameters biomass and number of members per size king

Phylogeography of the insular populations of common octopus, Octopus vulgaris Cuvier, 1797, in the Atlantic Macaronesia

Exploited, understudied populations of the common octopus, Octopus vulgaris Cuvier, 1797, occur in the northeastern Atlantic (NEA) throughout Macaronesia, comprising the Azores, Madeira and Canaries, and also the Cabo Verde archipelago. This octopus species, found from the intertidal to shallow continental-shelf waters, is largely sedentary, and the subject of intense, frequently unregulated fishing effort. We infer connectivity among insular populations of this octopus. Mitochondrial control region and COX1 sequence datasets reveal two highly divergent haplogroups (α and β) at similar frequencies, with opposing clinal distributions along the sampled latitudinal range. Haplogroups have different demographic and phylogeographic patterns, with origins related to the two last glacial maxima. FST values suggest a significant differentiation for most pairwise comparisons, including insular and continental samples, from the Galicia and Morocco coasts, with the exception of pairwise comparisons for samples from Madeira and the Canaries populations. Results indicate the existence of genetically differentiated octopus populations throughout the NEA. This emphasizes the importance of regulations by autonomous regional governments of the Azores, Madeira and the Canaries, for appropriate management of insular octopus stocksThis work was supported by the BANCOMAC (European Community Initiative INTERREG IIIB) and BANGEN projects (MAC Interreg Territorial Cooperation Programme “Madeira, Azores and Canary Islands”)S

Invasion of the dark false mussel in shrimp farms in Venezuela: species identification and genetic analysis

An inspection was carried out at shrimp farms located South West of Lake Maracaibo (Zulia State, Venezuela), with high incidences of mussel bivalve. Morphological and genetic analysis helped to identify the species as the dark false mussel Mytilopsis leucophaeata Conrad, 1831, and this is the first record of the species from tropical waters of northern South America. The highest incidences of mussels were detected in ponds and channels but no live mussels were observed in the coastal intertidal area surrounding the entrances of the farms, although empty shells were detected there, suggesting their former presence. The environmental conditions of the artificial system of shrimp culture, is a niche suitable for the proliferation of the bivalve. The consequences of the presence of this bivalve in the production of shrimp are discussed.S

Temporal evolution of the gonad index of the sea urchins Paracentrotus lividus (Echinoida: Echinidae) and Diadema africanum (Diadematoida: Diadematidae) in the Canary Islands (Spain).

Temporal evolution of the gonad index of the sea urchins Paracentrotus lividus (Echinoida: Echinidae) and Diadema africanum (Diadematoida: Diadematidae) in the Canary Islands (Spain). There are three main species of regular sea urchins in the Canary Islands. To establish the optimal fishing seasons for two of them, we studied the evolution of the gonadal index in several years and locations, of Paracentrotus lividus (April 2006 to March 2008 on Tenerife island in two locations: Las Galletas and La Jaca and from April 2006 to January 2009 in Gran Canaria island in two locations: Ojos de Garza and Gando), and Diadema africanum (January 2010 to May 2011 on Gran Canaria island in three locations: Risco Verde, Arguineguin and Agaete). In the case of P. lividus, located on the southern edge of their distribution, the presence of several annual maximum gonadal indez peak was observed, probably related to the temperature. These times of gonadal index increases corresponded to the stages of maturation. The main period of maturity coincided with the fall and early winter (August, October and December). There was sporadic emissions of gametes depending on location, in April, during the summer (June, July or August), autumn (September or October) and winter (December, January or February). This fragmented situation is possibly due to exposure to the hydrodynamic area’s and food abundance. The maximum presence of D. africanum occurred in the months of May to June, with virtually no variations throughout the year, in the southernmost locality (Arguineguin). In conclusion, the two species of sea urchins would be complementary shellfish resources, as their periods of maximum GI (Gonadal Index, capture time) do not overlap during the year. Rev. Biol. Trop. 63 (Suppl. 2): 251-260. Epub 2015 June 01.Con el fin de establecer las épocas óptimas de explotación como posible recurso marisquero de dos especies de erizos de mar en Canarias, se estudió la evolución temporal del índice gonadal en diferentes años y localidades de Paracentrotus lividus (abril de 2006 a marzo de 2008 en la isla de Tenerife y en dos localidades: Las Galletas y La Jaca; abril de 2006 a enero de 2009 en la isla de Gran Canaria y en dos localidades: Ojos de Garza y Gando), y de Diadema africanum (de enero de 2010 a mayo de 2011 en la isla de Gran Canaria y en tres localidades: Risco Verde, Arguineguín y Agaete). En el caso de P. lividus, que se encuentra en el límite sur de su distribución, se constató la presencia de varios picos máximos anuales en el índice gonadal, probablemente relacionados con la temperatura. Estas épocas de mayor índice gonadal se correspondieron con los estados de maduración de las gónadas. La principal época de madurez coincidió con el otoño y comienzo del invierno (agosto, octubre y diciembre). Existió emisión de gametos esporádicos en el año según la localidad, en abril, en verano (junio, julio o agosto), otoño (septiembre u octubre) e invierno (diciembre, enero o febrero). Posiblemente esta situación tan dispar sea debido a la exposición al hidrodinamismo de la zona y a la presencia o no de abundante alimento. Para D. africanum se presentó el máximo índice en los meses de mayo-junio, con prácticamente pocas variaciones anuales en la localidad situada más al sur (Arguineguín). En conclusión, las dos especies de erizos serían complementarias como recursos marisqueros, ya que no se superponen sus periodos de máximos IG (época de captura) en el año.Al Ministerio de Medio Ambiente y Medio Rural y Marino (MAGRAMA) que ha financiado varios proyectos de investigación a través de varias convocatorias de I + D + i. Proyectos Cultivo y Gestión del erizo de mar y Optimización del cultivo y manejo del erizo de mar. Plan Nacional de Cultivos Marinos (JACUMAR). Secretaría General del Mar. Ministerio de Medio Ambiente, Medio Rural y Marino. Proyecto DIADEMAR Desarrollo de un plan de control del erizo Diadema antillarum para la mejora ambiental de los fondos rocosos mediante su valorización socioeconómica. Ministerio de Medio Ambiente y Medio Rural y MarinoS

Gracilaria ferox J. Agardh, nuevo taxon para la isla de Gran Canaria

The presence of Gracilaria ferox J. Agardh is recorded for the first time in the Canaries Islands. An anatomic-morphological study is undertaken on the speciesSe cita la presencia de Gracilaria ferav J. Agardh para el archipiélago canario y se hace un estudio anatómico morfológico de dicha especie

Crisis reputacional de la acuicultura en España: estudio DAFO, medidas de mejora y acciones estratégicas

Poster.-- XVIII Congreso Nacional de Acuicultura “Acuicultura: mares y ríos de oportunidades”, Cádiz, del 21 al 24 de noviembre de 2022La producción de acuicultura en España en 2021 se estimó en 313.274 toneladas La principal especie producida es el mejillón (235.000 t), seguido por la lubina (23.322 t), la trucha arcoíris (19.250 t) y la dorada (10.795 t). La producción nacional de acuicultura se destina a engorde o criadero y su finalidad es principalmente comercial para la primera y comercial y repoblación para la segunda. Esta actividad se desarrolla en 5.262 establecimientos de acuicultura repartidos en 5 regiones de producción (Continental, Noroeste, Mediterránea, Sur‐atlántica y Canarias. De ellos, 4.980 se dedican a acuicultura marina de moluscos, 168 son granjas activas de acuicultura continental (agua dulce), 114 granjas en costa y mar (72 en costa, playas, zonas intermareales y esteros y 42 en el mar), distribuidas en 17 CCAA (Figura 1). ¿Que es una crisis reputacional y cómo afecta a la acuicultura? Una crisis reputacional se origina cuando se produce la concatenación de varios factores que provocan un impacto en una empresa o en un sector empresarial, disminuyendo su credibilidad y pudiendo generar una pérdida de la confianza en la sociedad. Muchas empresas han sufrido crisis reputacionales, generadas en redes sociales o medios de comunicación, como consecuencia de un mal comentario o crítica. La Acuicultura es un sector global que desarrolla una actividad que es desempeñada por múltiples empresas que cultivan una variedad grande de especies, empleando metodologías diversas. Dado que la crisis reputacional afecta a todo el sector, resultará difícil que las empresas, de forma individual, asuman inversiones económicas para la realización de campañas de garantía reputacional, por lo que será necesario que, además de las empresas, se impliquen las administraciones para revalorizar un sector de gran importancia económica y socialN

Morphological and molecular characterization of a new species of Atlantic stalked barnacle (Scalpelliformes: Pollicipedidae) from the Cape Verde Islands

8 pages, 2 tables, 4 figuresThe taxonomy of pedunculate cirripedes belonging to the genus Pollicipes has essentially remained unchanged since Charles Darwin described them in his exhaustive work on the Cirripedia. This genus includes three species of stalked barnacles: Pollicipes pollicipes in the north-eastern Atlantic, P. polymerus in the north-eastern Pacific and P. elegans in the central-eastern Pacific. However, a population genetics analysis of P. pollicipes suggested the presence of a putative cryptic species collected from the Cape Verde Islands in the central-eastern Atlantic. This study examines the morphology of these genetically divergent specimens and compares them with that of representative Atlantic samples of the biogeographically closely related P. pollicipes and with the poorly described P. elegans. Molecular data, including mitochondrial COX1 and nuclear ribosomal interspaces sequences, were obtained for all species of the genus Pollicipes. Morphological distinctiveness, diagnostic characters, congruent divergence level and monophyletic clustering, at both nuclear and mitochondrial loci support the taxonomic status of this new species, Pollicipes darwini.Peer reviewe

Genetic differentiation of a critically endangered population of the limpet Patella candei candei d’Orbigny, 1840, in the Canary Islands

The adoption of measures to protect the viability of threatened populations should be supported by empirical data identifying appropriate conservation units and management strategies. The global population of the majorera limpet, P. candei candei d’Orbigny, 1840, is restricted to the Macaronesian islands in the NE Atlantic, including near-to-extinct and healthy populations in Fuerteventura and Selvagens, respectively. The taxonomic position, genetic diversity and intra- and interspecific relationships of these populations are unclear, which is hindering the implementation of a recovery plan for the overexploited majorera limpet on Fuerteventura. In this study, ddRAD-based genome scanning was used to overcome the limitations of mitochondrial DNA-based analysis. As a result, P. candei candei was genetically differentiated from the closely related P. candei crenata for the first time. Moreover, genetic differentiation was detected between P. candei candei samples from Selvagens and Fuerteventura, indicating that translocations from the healthy Selvagens source population are inadvisable. In conclusion, the majorera limpet requires population-specific management focused on the preservation of exceptional genetic diversity with which to face future environmental challenges.This research was supported by the Ministry for the Ecological Transition and the Demographic Challenge (MITECO), via the Biodiversity Foundation to the SNPs4candei Project (2020–2021).Peer reviewe

Mazo CR Nucleotide alignment Haplogroup alfa

Nucleotide Alignment of mitochondrial control region sequences from individuals of Megabalanus azoricus belonging to the Haplogroup alfa

Genetic diferentiation of a critically endangered population of the limpet Patella candei candei d’Orbigny, 1840, in the Canary Islands

The adoption of measures to protect the viability of threatened populations should be supported by empirical data identifying appropriate conservation units and management strategies. The global population of the majorera limpet, P. candei candei d’Orbigny, 1840, is restricted to the Macaronesian islands in the NE Atlantic, including near-to-extinct and healthy populations in Fuerteventura and Selvagens, respectively. The taxonomic position, genetic diversity and intra- and interspecific relationships of these populations are unclear, which is hindering the implementation of a recovery plan for the overexploited majorera limpet on Fuerteventura. In this study, ddRAD-based genome scanning was used to overcome the limitations of mitochondrial DNA-based analysis. As a result, P. candei candei was genetically differentiated from the closely related P. candei crenata for the first time. Moreover, genetic differentiation was detected between P. candei candei samples from Selvagens and Fuerteventura, indicating that translocations from the healthy Selvagens source population are inadvisable. In conclusion, the majorera limpet requires population-specific management focused on the preservation of exceptional genetic diversity with which to face future environmental challengesThis research was supported by the Ministry for the Ecological Transition and the Demographic Challenge (MITECO), via the Biodiversity Foundation to the SNPs4candei Project (2020–2021). Open Access funding provided thanks to the CRUE-CSIC agreement with Springer NatureS