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Figure 17 in Tanaidacea (Crustacea: Peracarida) of the northeast Atlantic: Chauliopleona Dojiri and Sieg, 1997 and Saurotipleona n. gen. from the 'Atlantic Margin'

Figure 17. Sketch drawings of Chauliopleona and Saurotipleona. (A) C. hastata?, BIOICE Stn 3187; (B) C. armata sensu lato, Thalassa-73 Stn Z.426; (C–E) S. julii, INCAL ØS.04, cheliped, pleon and pleonite-5 spur, respectively. Not to scale.

Figure 13 in Tanaidacea (Crustacea: Peracarida) of the northeast Atlantic: Chauliopleona Dojiri and Sieg, 1997 and Saurotipleona n. gen. from the 'Atlantic Margin'

Figure 13. Chauliopleona hastata. Non-ovigerous female, BIOICE Stn 2027: (A–F) pereopods 1–6, respectively; (G) pleopod (setae very finely plumose, omitted for clarity). Scale bar 0.25 mm.

Figure 15. Saurotipleona julii n. gen. n in Tanaidacea (Crustacea: Peracarida) of the northeast Atlantic: Chauliopleona Dojiri and Sieg, 1997 and Saurotipleona n. gen. from the 'Atlantic Margin'

Figure 15. Saurotipleona julii n. gen. n. sp. Non-ovigerous female paratype, BIOICE Stn 3522: (A) labrum; (B–C) left and right mandibles, respectively; (D) labium; (E) maxillule; (F) maxilla; (G) maxilliped (one palp omitted); (H) cheliped; (J) cheliped carpus inferior setae; (K) cheliped propodus mesial comb and dactylus. Scale bars: (i) 0.25 mm for A–G; (ii) 0.25 mm for H–J.

Figure 11 in Tanaidacea (Crustacea: Peracarida) of the northeast Atlantic: Chauliopleona Dojiri and Sieg, 1997 and Saurotipleona n. gen. from the 'Atlantic Margin'

Figure 11. Chauliopleona hastata. Non-ovigerous female, BIOICE Stn 2027: (A) habitus; (B) pleonal sternites, lateral; (C) pleonite-5 spur variant; (D) antennule; (E) antenna; (F) uropod. Preparatory male, BIOICE Stn 2027: (G) habitus; (H) antennule. Scale bars: (i) 1 mm for A, G; (ii) 0.5 mm for B–C, 0.25 mm for D–F, H.

Figure 10. Chauliopleona bamberi n in Tanaidacea (Crustacea: Peracarida) of the northeast Atlantic: Chauliopleona Dojiri and Sieg, 1997 and Saurotipleona n. gen. from the 'Atlantic Margin'

Figure 10. Chauliopleona bamberi n. sp. Ovigerous female, paratype, AFEN Stn 53815: (A–C) pereopods 1–3, respectively; (D) pereopod-4 ischium; (E) pereopod-4, basis omitted; (F) pereopod-5; (G–H) pereopod-6 basis and propodus-claw, respectively; (J) pleopod endopod (setae very finely plumose, omitted for clarity; and following); (K) pleopod basal article and exopod. Scale bar: 0.25 mm.

Figure 12 in Tanaidacea (Crustacea: Peracarida) of the northeast Atlantic: Chauliopleona Dojiri and Sieg, 1997 and Saurotipleona n. gen. from the 'Atlantic Margin'

Figure 12. Chauliopleona hastata. Non-ovigerous female, BIOICE Stn 2027: (A) labrum; (B–C) left and right mandibles, respectively; (D) maxillule; (E) maxilla; (F) maxilliped (one palp omitted); (G) maxilliped palp article-2 mesial setation; (H) epignath; (J) cheliped; (K) cheliped propodus mesial comb. Scale bars: (i) 0.25 mm for A–H; (ii) 0.25 mm for J–K.

Figure 9. Chauliopleona bamberi n in Tanaidacea (Crustacea: Peracarida) of the northeast Atlantic: Chauliopleona Dojiri and Sieg, 1997 and Saurotipleona n. gen. from the 'Atlantic Margin'

Figure 9. Chauliopleona bamberi n. sp. Ovigerous female, paratype, AFEN Stn 53815: (A) labrum; (B–C) left and right mandibles, respectively; (D) labium; (E) maxillule; (F) maxillule endite spines; (G) maxilla; (H) maxilliped (one palp omitted); (J) maxilliped endite; (K) epignath; (L) cheliped; (M) cheliped propodus mesial comb and dactylus. Scale bars: (i) 0.25 mm for A–K; (ii) 0.25 mm for L–M.

Figure 8. Chauliopleona bamberi n in Tanaidacea (Crustacea: Peracarida) of the northeast Atlantic: Chauliopleona Dojiri and Sieg, 1997 and Saurotipleona n. gen. from the 'Atlantic Margin'

Figure 8. Chauliopleona bamberi n. sp. Non-ovigerous female, holotype, AFEN Stn 53919#2/3. (A) habitus; (B) pleon and pleotelson, lateral; (C) pleonite-5 sternal spur. Ovigerous female paratype, AFEN Stn 53815: (D) antennule; (E) antenna; (F) uropod. Preparatory male, allotype, AFEN Stn 53815: (G) cephalothorax–pereonite-1; (H) antennule. Scale bars: (i) 1 mm for A, G; (ii) 0.5 mm for B–C, 0.25 mm for D–F, H.

Figure 6 in Tanaidacea (Crustacea: Peracarida) of the northeast Atlantic: Chauliopleona Dojiri and Sieg, 1997 and Saurotipleona n. gen. from the 'Atlantic Margin'

Figure 6. Chauliopleona armata. Non-ovigerous female, BIOICE Stn 2856: (A) labrum; (B) left mandible molar; (C) right mandible; (D) maxillule endite; (E) maxilliped (palps omitted); (F) maxilliped palp article-2; (G) epignath; (H) cheliped; (J) cheliped propodus mesial comb and dactylus. Scale bars: (i) 0.25 mm for A–G; (ii) 0.25 mm for H–J.

Figure 5 in Tanaidacea (Crustacea: Peracarida) of the northeast Atlantic: Chauliopleona Dojiri and Sieg, 1997 and Saurotipleona n. gen. from the 'Atlantic Margin'

Figure 5. Chauliopleona armata. Non-ovigerous female, BIOICE Stn 2856: (A) habitus; (B) pleonal sternites, lateral; (C) antennule; (D) antenna; (E) uropod. Scale bars: (i) 1 mm for A; (ii) 0.5 mm for B; (iii) 0.25 mm for C–E.

Figure 2 in Tanaidacea (Crustacea: Peracarida) of the northeast Atlantic: Chauliopleona Dojiri and Sieg, 1997 and Saurotipleona n. gen. from the 'Atlantic Margin'

Figure 2. Chauliopleona amdrupii. Non-ovigerous female, BIOICE Stn 3282: (A) habitus; (B) pleonal sternites, lateral; (C) antennule; (D) antenna; (E) pleopod endopod (setae very finely plumose, omitted for clarity; and following); (F) pleopod exopod; (G) uropod. Scale bar: 1 mm for A; 0.5 mm for B; 0.25 mm for C–G.

Figure 7 in Tanaidacea (Crustacea: Peracarida) of the northeast Atlantic: Chauliopleona Dojiri and Sieg, 1997 and Saurotipleona n. gen. from the 'Atlantic Margin'

Figure 7. Chauliopleona armata. Non-ovigerous female, BIOICE Stn 2856: (A–F) pereopods 1–6 respectively; (G) pleopod (setae very finely plumose, omitted for clarity). Scale bar 0.25 mm.

opencc-zeroAug 2020View details →

Data from: Marine regime shifts impact synchrony of deep‐sea fish growth in the Northeast Atlantic

The complexity and spatio–temporal scale of populations' dynamics influence how populations respond to large-scale ecological pressures. Detecting and attributing synchrony (i.e. temporally coincident fluctuations in populations' parameters) is key as synchronous populations can become more vulnerable to stochastic events that can affect the viability of harvest and have profound consequences to community structure. Here, we aimed to estimate the level of synchrony in fish growth within and among species across 1 million km2 and identify the environmental drivers contributing to synchronous population fluctuations. We developed otolith increment-based growth chronologies for two deep-sea scorpaenid fishes (Helicolenus dactylopterus and Pontinus kuhlii) from geographically and bathymetrically disjunct populations in the northeast Atlantic (one species in three locations; two species with different depth preferences). We used hierarchical models to partition variation in growth within and between populations attributing it to intrinsic (age, species, population) and extrinsic (environmental variables) drivers. We assessed synchrony in growth variation within and among species and identified common change points in population specific growth patterns. We documented time-variant synchrony in growth variation of geographically and bathymetrically segregated deep-sea fish populations, lasting 25 and 18 years, respectively. The observed synchrony was likely driven by shared environmental forcing (Moran effect) as large-scale climate indices (East Atlantic pattern and North Atlantic Oscillation) were important environmental drivers of overall growth variation while the onset of synchrony in growth variation was likely related to marine regime shifts occurring in a wide area of the northeast Atlantic that affected the entire ecosystem. However, our capacity to extrapolate growth information across species and locations was dependent on the timing and magnitude of environmental change. Developing a better understanding of the mechanisms driving growth synchrony is key to ensure sustainable management of populations in habitats that are fragile and highly sensible to environmental change, such as the deep-sea.

opencc-zeroNov 2020View details →

Cold-water coral assemblages on vertical walls: distribution patterns from the Northeast Atlantic

Aim: In this study, we assess patterns of cold-water coral assemblages observed on deep-sea vertical walls. Similar to their shallow-water counterparts, vertical and overhanging walls in the deep sea can host highly diverse communities, but because of their geometry, these habitats are generally overlooked and remain poorly known. These vertical habitats are however of particular interest, because they can protect vulnerable coral ecosystems from trawling activities. As such, it is important to understand their ecology and assess their global importance. Location: Vertical walls on complex geomorphic features, in particular walls of the Rockall Bank Slope Failure Escarpment, Whittard and Explorer Canyons, Northeast Atlantic. Methods: Video analysis of ROV transects carried out at five sites is used to investigate differences in species composition and diversity across walls and to compare those to nearby cold-water coral sites on flat terrain. A high-resolution photogrammetric reconstruction is further employed to examine whether wall complexity plays a role in promoting niche differentiation at very fine spatial scales. Results: The investigated walls showed differences in species assemblage both across walls as well as in comparison to flat sites, with the fine-scale heterogeneity engendered by walls allowing niche differentiation between closely-related taxa. Main Conclusions: Vertical walls represent an important cold-water coral habitat with differences in species composition across walls within a region, illustrating their role in driving diversity patterns. Based on publicly available bathymetric datasets and a catalogue of broad-scale terrain features, globally over 8,000 features are likely to have vertical walls and cold-water corals, which highlights the need to consider deep-sea vertical habitats in current conservation efforts.

opencc-zeroDec 2017View details →

Data from: Density regulation in Northeast Atlantic fish populations: density dependence is stronger in recruitment than in somatic growth

1. Population regulation is a central concept in ecology, yet in many cases its presence and the underlying mechanisms are difficult to demonstrate. The current paradigm maintains that marine fish populations are predominantly regulated by density-dependent recruitment. 2. While it is known that density-dependent somatic growth can be present too, its general importance is unknown and most practical applications neglect it. This study aimed to close this gap by for the first time quantifying and comparing density dependence in growth and recruitment over a large set of fish populations. 3. We fitted density-dependent models to time series data on population size, recruitment and age-specific weight from commercially exploited fish populations in the Northeast Atlantic Ocean and the Baltic Sea. Data were standardised to enable a direct comparison within and among populations, and estimated parameters were used to quantify the impact of density regulation on population biomass. 4. Statistically significant density dependence in recruitment was detected in a large proportion of populations (70%) whereas for density dependence in somatic growth the prevalence of density dependence depended heavily on the method (26% and 69%). Despite age-dependent variability, the density dependence in recruitment was consistently stronger among age groups and between alternative approaches that use weight-at-age or weight increments to assess growth. Estimates of density-dependent reduction of biomass underlined these results: 97% of populations with statistically significant parameters for growth and recruitment showed a larger impact of density-dependent recruitment on population biomass. 5. The results reaffirm the importance of density-dependent recruitment in marine fishes, yet they also show that density dependence in somatic growth is not uncommon. Further, the results are important from an applied perspective because density dependence in somatic growth affects productivity and catch composition, and therefore the benefits of maintaining fish populations at specific densities.

opencc-zeroJan 2024View details →

Ocean climate and hydrodynamics drive decadal shifts in Northeast Atlantic dinoflagellates

The abundance of large marine dinoflagellates has declined in the North Sea since 1958. Although hypotheses have been proposed to explain this diminution (increasing temperature and wind), the mechanisms behind this pattern have thus far remained elusive. In this article, we study the long-term changes in dinoflagellate biomass and biodiversity in relation to hydro-climatic conditions and circulation within the North-Atlantic. Our results show that the decline in biomass has paralleled an increase in biodiversity caused by a temperature-induced northward movement of subtropical taxa along the European shelf-edge, and facilitated by changes in oceanic circulation (subpolar gyre contraction). However, major changes in North Atlantic hydrodynamics in the 2010s (subpolar gyre expansion and low-salinity anomaly) stopped this movement, which triggered a biodiversity collapse in the North Sea. Further, North Sea dinoflagellate biomass remained low because of warming. Our results, therefore, reveal that regional climate warming and changes in oceanic circulation strongly influenced shifts in dinoflagellate biomass and biodiversity. The data provided here are the changes in dinoflagellates taxonomic richness and biomass in the Northeast Atlantic, the salinity and temperature optimums of each taxa and various hydroclimatic indices.

opennotspecifiedMar 2024View details →

FIGURE 1 in Two new species of Prionospio (Annelida: Spionidae) from the Northwest and Northeast Atlantic

FIGURE 1. World distribution of the six species most similar to Prionospio dubia.

opennotspecifiedNov 2017View details →

FIGURE 1 in Benthic hydroids (Cnidaria, Hydrozoa) from bathyal and abyssal depths of the Northeast Atlantic held in the modern Discovery Collections

FIGURE 1. Area of study and location of stations

opencc-by-4.0Jun 2024View details →

Hawkmoths diversity and activity in an Atlantic Forest - Caatinga ecotone, Northeast Brazil

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