Demersal Resources

Aguilar, María González; Ruiz, Cristina García; Jiménez, Teresa García; Quintero, José M.; Antonell, Cristina Ciércoles; Domínguez, Jorge Baro

doi:10.1007/978-3-030-65516-7_18

Cited by 2 publications

(1 citation statement)

References 57 publications

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“…The Strait of Gibraltar (SoG) and the Alboran Sea represent areas of oceanographic and biological confluence, which are located between the Mediterranean Sea and the Atlantic Ocean [1][2][3]. This sector of the Western Mediterranean Sea presents complex submarine geomorphology, with a high diversity of habitats, species (including a wide variety of threatened ones), and commercially exploited marine resources [1,2,[4][5][6]. Unfortunately, it is also an area exposed to high anthropogenic pressures, harbouring widely urbanized coastal areas, intense maritime traffic, and high activity of industrial and artisanal fishing fleets, which require complex spatial and temporal management.…”

Section: Introductionmentioning

confidence: 99%

Spatial Distribution and Potential Impact of Drifted Thalli of the Invasive Alga Rugulopteryx okamurae in Circalittoral and Bathyal Habitats of the Northern Strait of Gibraltar and the Alboran Sea

Rueda,

Mena-Torres,

Gallardo-Núñez

et al. 2023

Diversity

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The arrival of a new invasive alga, Rugulopteryx okamurae, in the Strait of Gibraltar (SoG) in 2015 marked an unprecedented milestone in the North African and, later, in the European marine ecosystems. Nowadays, it is colonising vast infralittoral areas and significantly modifying some habitats and associated communities of the southern Iberian Peninsula. In recent expeditions, a high amount of free drifted thalli of this alga has been detected in different circalittoral and bathyal habitats of the northern SoG and the Alboran Sea. The present study combines quantitative data of this alga obtained with the use of a remotely operated vehicle (ROV) and a bottom otter trawl. The coverage–entanglement level of the drifted thalli on circalittoral and bathyal benthic invertebrates (e.g., not covering, covering only the basal part, covering one-third of the invertebrate, etc.) was also annotated from picture frames taken in locations with abundant drifted thalli. In underwater images, drifted thalli were mainly detected in circalittoral and bathyal bottoms of the northern SoG and the north-western Alboran Sea, between 50 to ca. 450 m depth. Nevertheless, abundant drifted thalli were also detected in bottom otter trawl samples from circalittoral bottoms of the north-central and north-eastern Alboran Sea. Small benthic organisms (e.g., encrusting sponges, hydrozoans, etc.) generally displayed low coverage–entanglement levels of drifted thalli. Nevertheless, large sessile and colonial benthic organisms with a complex three-dimensional morphology (e.g., gorgonians, colonial scleractinians) reached high levels of R. okamurae thalli entangled in different parts of their colonies. The drifted R. okamurae thalli entangled in these colonial suspension feeding organisms may hinder their feeding capability in the long term, resulting in habitat deterioration in the near future.

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Section: Introductionmentioning

confidence: 99%

Spatial Distribution and Potential Impact of Drifted Thalli of the Invasive Alga Rugulopteryx okamurae in Circalittoral and Bathyal Habitats of the Northern Strait of Gibraltar and the Alboran Sea

Rueda,

Mena-Torres,

Gallardo-Núñez

et al. 2023

Diversity

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Decapod crustacean assemblages on trawlable grounds in the northern Alboran Sea and Gulf of Vera

Ciércoles

García‐Ruíz

Abelló

et al. 2022

scimar

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This study analyses the samples collected annually (2012 to 2018) on circalittoral and bathyal soft bottoms (30 to 800 m) by the MEDITS surveys in the northern Alboran Sea (including Alboran Island) and the Gulf of Vera to determine the composition, structure and distribution of decapod crustacean assemblages. A total of 94 decapod crustacean species were identified. Non-metric multidimensional scaling showed depth to be the main factor for distinguishing four main decapod assemblages: the inner shelf (30-100 m depth), outer shelf (101-200 m), upper slope (201-500 m) and middle slope (501-800 m). PERMANOVA analyses revealed further significant depth-related differences between three established geographical sectors of the study area (northern Alboran Sea, Gulf of Vera and Alboran Island). Generalized additive model analyses were used to assess the bathymetrical, geographical and environmental effects on the ecological indices of each assemblage. Results showed that depth and the geographical effect were the main drivers in all cases. Decreases in abundance and increases in species richness, Shannon-Wiener diversity and Pielou’s evenness indices with depth were detected. This study shows the primacy of depth and geographical effect on the distribution of decapod species in the study area, in alignment with findings from other parts of the Mediterranean Sea.

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Demersal Resources

Cited by 2 publications

References 57 publications

Spatial Distribution and Potential Impact of Drifted Thalli of the Invasive Alga Rugulopteryx okamurae in Circalittoral and Bathyal Habitats of the Northern Strait of Gibraltar and the Alboran Sea

Spatial Distribution and Potential Impact of Drifted Thalli of the Invasive Alga Rugulopteryx okamurae in Circalittoral and Bathyal Habitats of the Northern Strait of Gibraltar and the Alboran Sea

Decapod crustacean assemblages on trawlable grounds in the northern Alboran Sea and Gulf of Vera

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