Papers by Adriana Nogueira
Ices Journal of Marine Science, Mar 8, 2021
Deep-sea marine fishes support important fisheries but estimates of their distributions are often... more Deep-sea marine fishes support important fisheries but estimates of their distributions are often incomplete as the data behind them may reflect fishing practices, access rights, or political boundaries, rather than actual geographic distributions. We use a simple suitable habitat model based on bottom depth, temperature, and salinity to estimate the potential distribution of Greenland halibut (Reinhardtius hippoglossoides). A large presence-only dataset is examined using multivariate kernel densities to define environmental envelopes, which we link to spatial distribution using a pan-Arctic oceanographic model. Occurrences generally fit the model well, although there were gaps in the predicted circum-Arctic distribution likely due to limited survey activity in many of the ice-covered seas around the Arctic Ocean. Bottom temperature and depth were major factors defining model fit to observations, but other factors, such as ecosystem interactions and larval drift could also influence distribution. Model predictions can be tested by increasing sampling effort in poorly explored regions and by studying the connectivity of putative populations. While abundances of Greenland halibut in the High Arctic are currently low, some areas are predicted to be suitable habitat for this species, suggesting that on-going sea-ice melt may lead to fisheries expansion into new areas.
ICES Journal of Marine Science
Marine fisheries are often allocated to stocks that reflect pragmatic considerations and may not ... more Marine fisheries are often allocated to stocks that reflect pragmatic considerations and may not represent the species’ spatial population structure, increasing the risk of mismanagement and unsustainable harvesting. Here we compile mark–recapture data collected across the North Atlantic to gain insight into the spatial population structure of Greenland halibut (Reinhardtius hippoglossoides), an issue that has been unresolved for decades. The dataset contains 168130 fish tagged from 1952 to 2021, with 5466 (3.3%) recaptured individuals. Our results indicate that fish tagged at <50 cm body length migrate at higher rates, suggesting that mark–recapture studies on adult individuals underestimate population-level migration rates. We find evidence for migrations across management units in the North Atlantic indicating two regional offshore populations: one in the Northeast Atlantic, where the West Nordic and Northeast Arctic stocks, currently managed separately, likely belong to a sin...
ICES Journal of Marine Science, 2021
The distribution and abundance of marine fishes have been changing over the last decades due to c... more The distribution and abundance of marine fishes have been changing over the last decades due to climate change and overfishing. We evaluated the status of an important exploited marine ecosystem for one of the largest fisheries in Greenland, Greenland halibut Reinhardtius hippoglossoides, in the offshore slopes of West Greenland. We examined how five ecological indicators changed from 1997 to 2019 under the effect of climate and commercial fishery. The oscillatory tendency of the bottom temperature modified the structure and composition of the demersal fish community. In the shallower zone, the warming bottom temperature favoured high trophic level and warmer water species, and subsequently, an increase in halibut biomass, which reduced the biodiversity. In the middle depth zone, the high biomass of halibut masked increases of less common higher trophic level species. In the deep zone, the drastic reduction of halibut biomass coincided with an increase of high trophic level and cold...
Some ecological indices were calculated from the data obtained in the research surveys conducted ... more Some ecological indices were calculated from the data obtained in the research surveys conducted by Spain in NAFO divisions 3NO between the years 2002 and 2011. These indices were calculated for individual populations (intrinsic population rate of growth and mean length) and for all the community (ABC curves, indices about faunal diversity, proportion of non-commercial species, mean length in community and size spectra). We use the data of twenty five species caught in the survey along the years, included Northern shrimp (Pandalus borealis). The data of Northern shrimp, capelin (Mallotus villosus) and Northern sand lance (Ammodytes dubius) have a great influence in the value of the indices, as their abundance is very high in relation to their contribution to the biomass. The indices present a general stable pattern with a slight improvement in recent years. After two decades of moratorium, yellowtail flounder (Limanda ferruginea) seems to be recovered and other important commercial species as Atlantic cod (Gadus morhua) and American plaice (Hippoglossoides platessoides) begin to recover in the South of the Grand Banks.
ICES Journal of Marine Science: Journal du Conseil, 2015
An ecosystem approach is widely recognized as desirable for fisheries management. A key element i... more An ecosystem approach is widely recognized as desirable for fisheries management. A key element is the development of indicators for the assessment of ecosystem status. We evaluated the status of two, exploited marine ecosystems, Southern Grand Banks of Newfoundland and Flemish Cap, using a multivariate analysis and a suit of ecological indicators. We used data obtained from two multispecies bottom trawl surveys performed by the Spanish Administration in the Southern Grand Banks (3NO survey) from 2002 to 2014, and the EU in the Flemish Cap (3M survey) from 1991 to 2014. We studied the dynamic of major demersal fish assemblages (38-300, 301-600, and 601-1460 m depth in 3NO; 129-250, 251-600, and 601-1460 m in 3M). Temporal changes and trends in fish assemblages' structure were tested using a non-metric multidimensional scaling and four indicators (mean trophic level, species evenness, species diversity, and species richness). This study revealed the importance of calculating indicators in each assemblage and the usefulness of indices to compare areas and periods under different fishing pressure.
ICES Journal of Marine Science, 2014
The Newfoundland Shelf supported one of the world’s greatest fisheries until the main commercial ... more The Newfoundland Shelf supported one of the world’s greatest fisheries until the main commercial species collapsed more than two decades ago. We calculated three ecological indices for individual populations and five for community from the data obtained in the research surveys conducted by Spain in NAFO Regulatory Area Divisions 3NO between 2002 and 2013. We use data for 24 species to study the dynamics of major demersal fish assemblages (38–300, 301–600, and 601–1460 m depth) and evaluated how they have responded to different levels of exploitation. Trends and changes for individual populations (abundance and biomass, intrinsic population rate of growth, and mean length) and for all the community (ABC curves, indices of faunal diversity, proportion of non-commercial species, mean length in community and size spectra) were used to test ecological trends. Indices showed no homogeneous status and responded to different exploitation patterns, management, and environmental regimes in ea...
Journal of Northwest Atlantic Fishery Science, 2013
Data from EU-Spain (Instituto Español de Oceanografía) bottom trawl surveys in the NAFO Regulator... more Data from EU-Spain (Instituto Español de Oceanografía) bottom trawl surveys in the NAFO Regulatory Area (2002-2011) were analyzed to examine patterns on the South of Grand Banks (NAFO Div. 3NO) of groundfish assemblage structure and diversity in relation to depth. The 1160 hauls from the slope surveys spanned between 38 and 1460 m in depth. We focused on the 28 most abundant species, which made up 92.6% of the catch in terms of biomass. Assemblage structure was strongly correlated with depth. For the most part, changes in assemblages seem to be fairly continuous, although there were more abrupt changes at 300 m. Five assemblages were identified. Two shallow assemblages were found in the shelf. Assemblage I (Shallow) comprises the strata with depths lesser than 150 and include yellowtail flounder (Limanda ferruginea), American plaice (Hippoglossoides platessoides), Northern sand lance (Ammodytes dubius), moustache sculpin (Triglops murrayi), capelin (Mallotus villosus) and web sculpin (Hemitripterus americanus). Assemblage II (Shallow) includes the strata with depths between 151 and 300 m and comprises Atlantic cod (Gadus morhua), American angler (Lophius americanus), wolfish (Anarichas lupus) and thorny skate (Amblyraja radiata). Assemblage III (Intermediate) contains the depth strata between 301 and 600 m. Redfish (Sebastes spp.), spotted wolfish (Anarichas minor), Arctic eelpout (Lycodes reticulatus), Northern wolfish (Anarichas denticulatus), white hake (Urophycis tenuis), witch flounder (Glyptocephalus cynoglossus) and longfin hake (Phycis chesteri) were included in the intermediate assemblage. Finally, we found two deep clusters: Assemblage IV (Deep) contains the depths between 601 and 1000 m, and Assemblage V (Deep) the depth strata greater than 1001 m. Greenland halibut (Reinhardtius hippoglossoides), marlin-spike (Nezumia bairdii), roughhead grenadier (Macrourus berglax) and spinytail skate (Bathyraja spinicauda) formed Assemblage IV. Snubnosed spiny eel (Notacanthus chemnitzii), blue antimora (Antimora rostrata), Northern cutthroat eel (Syphanobranchus kaupii), roundnose grenadier (Coryphaenoides rupestris), black dogfish (Centroscyllium fabricii), Arctic skate (Amblyraja hyperborea) and longnose chimera (Harriotta raleighana) made up the deepest assemblage. Despite dramatic changes in biomass and abundance of the species in the area, the boundaries and composition of the assemblages seem to be similar to the period before the collapse. Although some changes were evident, the main ones were replacements of the dominant species in several assemblages and bathymetric range extension of distribution of some species. Yellowtail flounder appears to be the dominant species in the shallowest assemblage instead of Atlantic cod and American plaice that were dominant in the period before the collapse in the area; redfish is the dominant species in the second shallow and intermediate assemblages. Diversity appears inversely related to biomass in the different assemblages. Despite the fishing effort in the deep waters of the Grand Banks, the overall pattern of demersal fish assemblages remains similar over time. This pattern is similar in other Atlantic areas; it indicates that changes in the fish populations in Northwest Atlantic have been produced on a large scale and are not limited to specific areas.
Marine Ecology Progress Series, 2020
In recent years, Arctic and sub-Arctic fish communities have shown extensive reorganization on sh... more In recent years, Arctic and sub-Arctic fish communities have shown extensive reorganization on shelves and in shallow waters, but little is known about the ecological impact of environmental changes in deeper waters. We examined temporal changes (1998-2016) in fish diversity and community structure based on research survey data from East Greenland, over a depth gradient spanning 400 to 1500 m. A northern and a southern continental slope region, 360 km apart, were analysed for temporal changes in water temperature and fish community structure. The bottom water temperature increased by up to 0.2 and 0.5°C, respectively. Contrary to expectations, there was a concomitant loss of species richness of up to 3 and 5 species, respectively, and a decrease in total abundance in both regions. Abundances of individual species displayed different trends between regions, with 3 species of wolf fishes (Anarhichas spp.) and American plaice Hippoglossoides platessoides decreasing in the north and blu...
The Newfoundland Shelf supported one of the world’s greatest fisheries until the main commercial ... more The Newfoundland Shelf supported one of the world’s greatest fisheries until the main commercial species collapsed more than two decades ago.
Wecalculated three ecological indices for individual populations and five for community from the data obtained in the research surveys conducted
by Spain in NAFORegulatory Area Divisions 3NO between 2002 and 2013. Weuse data for 24 species to study the dynamics of major demersal fish
assemblages (38–300, 301–600, and 601–1460 m depth) and evaluated how they have responded to different levels of exploitation. Trends and
changes for individual populations (abundance and biomass, intrinsic population rate of growth, and mean length) and for all the community (ABC
curves, indices of faunal diversity, proportion of non-commercial species, mean length in community and size spectra) were used to test ecological
trends. Indices showed no homogeneous status and responded to different exploitation patterns, management, and environmental regimes in each
assemblage. Our results show an improvement in the shallower and deeper assemblages and that fishing effort does not explain differences among
each assemblage.
Data from EU-Spain (Instituto Español de Oceanografía) bottom trawl surveys in the NAFO Regulator... more Data from EU-Spain (Instituto Español de Oceanografía) bottom trawl surveys in the NAFO Regulatory Area (2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011) were analyzed to examine patterns on the South of Grand Banks (NAFO Div. 3NO) of groundfish assemblage structure and diversity in relation to depth. The 1160 hauls from the slope surveys spanned between 38 and 1460 m in depth. We focused on the 28 most abundant species, which made up 92.6% of the catch in terms of biomass.
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Papers by Adriana Nogueira
Wecalculated three ecological indices for individual populations and five for community from the data obtained in the research surveys conducted
by Spain in NAFORegulatory Area Divisions 3NO between 2002 and 2013. Weuse data for 24 species to study the dynamics of major demersal fish
assemblages (38–300, 301–600, and 601–1460 m depth) and evaluated how they have responded to different levels of exploitation. Trends and
changes for individual populations (abundance and biomass, intrinsic population rate of growth, and mean length) and for all the community (ABC
curves, indices of faunal diversity, proportion of non-commercial species, mean length in community and size spectra) were used to test ecological
trends. Indices showed no homogeneous status and responded to different exploitation patterns, management, and environmental regimes in each
assemblage. Our results show an improvement in the shallower and deeper assemblages and that fishing effort does not explain differences among
each assemblage.
Wecalculated three ecological indices for individual populations and five for community from the data obtained in the research surveys conducted
by Spain in NAFORegulatory Area Divisions 3NO between 2002 and 2013. Weuse data for 24 species to study the dynamics of major demersal fish
assemblages (38–300, 301–600, and 601–1460 m depth) and evaluated how they have responded to different levels of exploitation. Trends and
changes for individual populations (abundance and biomass, intrinsic population rate of growth, and mean length) and for all the community (ABC
curves, indices of faunal diversity, proportion of non-commercial species, mean length in community and size spectra) were used to test ecological
trends. Indices showed no homogeneous status and responded to different exploitation patterns, management, and environmental regimes in each
assemblage. Our results show an improvement in the shallower and deeper assemblages and that fishing effort does not explain differences among
each assemblage.