Fishing Effort Increase and Resource Status of the Deep-Sea Red Shrimp <i>Aristeus antennatus</i> (Risso 1816) in the Northwest Mediterranean Sea Since the 1950s

Gorelli, Giulia; Sardà, Francisco

doi:10.1080/23308249.2015.1119799

Cited by 21 publications

(14 citation statements)

References 29 publications

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“…Nevertheless, even if the preferential model improves the estimation of the bathymetric effect, new observations at deeper waters could further improve this relationship and better understand the blue and red shrimp distribution in this area (Gorelli, Sardà, & Company, 2016).…”

Section: Discussionmentioning

confidence: 99%

Accounting for preferential sampling in species distribution models

Pennino

Paradinas

Illian

et al. 2018

Ecology and Evolution

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Species distribution models (SDMs) are now being widely used in ecology for management and conservation purposes across terrestrial, freshwater, and marine realms. The increasing interest in SDMs has drawn the attention of ecologists to spatial models and, in particular, to geostatistical models, which are used to associate observations of species occurrence or abundance with environmental covariates in a finite number of locations in order to predict where (and how much of) a species is likely to be present in unsampled locations. Standard geostatistical methodology assumes that the choice of sampling locations is independent of the values of the variable of interest. However, in natural environments, due to practical limitations related to time and financial constraints, this theoretical assumption is often violated. In fact, data commonly derive from opportunistic sampling (e.g., whale or bird watching), in which observers tend to look for a specific species in areas where they expect to find it. These are examples of what is referred to as preferential sampling, which can lead to biased predictions of the distribution of the species. The aim of this study is to discuss a SDM that addresses this problem and that it is more computationally efficient than existing MCMC methods. From a statistical point of view, we interpret the data as a marked point pattern, where the sampling locations form a point pattern and the measurements taken in those locations (i.e., species abundance or occurrence) are the associated marks. Inference and prediction of species distribution is performed using a Bayesian approach, and integrated nested Laplace approximation (INLA) methodology and software are used for model fitting to minimize the computational burden. We show that abundance is highly overestimated at low abundance locations when preferential sampling effects not accounted for, in both a simulated example and a practical application using fishery data. This highlights that ecologists should be aware of the potential bias resulting from preferential sampling and account for it in a model when a survey is based on non‐randomized and/or non‐systematic sampling.

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Section: Discussionmentioning

confidence: 99%

Accounting for preferential sampling in species distribution models

Pennino

Paradinas

Illian

et al. 2018

Ecology and Evolution

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“…Around canyons, these are mainly targeting the deep-sea red shrimp Aristeus antennatus (Sardá et al, 2009) and, thus, trawling grounds occur around their heads, rims and flanks up to 800 m depth (Román et al, 2016;Paradis et al, 2018). The engine power of the fishing boats was almost negligible until the 1960s, when the trawling fleet underwent an important technification implying the change of wind-propelled vessels by a fully motorized fleet (Gorelli et al, 2016). This activity supports a specialized commercial fleet (~17 trawling-boats) that have been exploiting the area for over 60 years (Sardá et al, 2009;Ramirez-Llodrà et al, 2010) causing a profound impact on the seafloor (Puig et al, 2012;Martin et al, 2014a, Paradis et al, 2018.…”

Section: Study Area and Sampling Strategymentioning

confidence: 99%

Role of spatial scales and environmental drivers in shaping nematode communities in the Blanes Canyon and its adjacent slope

Román

Lins

Ingels

et al. 2019

Deep Sea Research Part I: Oceanographic Research Papers

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Understanding community assembly and processes driving diversity in deep-sea environments is a major challenge in marine ecosystems. In this paper, we investigated the importance of environmental gradients at different spatial scales in structuring deep-sea canyon and continental slope meiobenthic nematode communities in the NW Mediterranean Sea. Three scales were investigated 1) Ecosystem: Blanes Canyon vs. adjacent open slope; 2) Water-depth within each ecosystem: 1500, 1750 and 2000 m; and 3) Vertical profile (three layers within the first 5 cm of sediment). Nematode communities were analysed in terms of density, biomass, diversity and community structure. Grain size, Chl a, Chl a: phaeopigments, CPE, organic carbon and total nitrogen were measured to assess the relationships with nematode assemblages. Blanes Canyon harbours more abundant and diverse assemblages than slope, particularly at 1,750 m and 2,000 m depth respectively. The higher canyon values may be related to the higher food availability observed in the former, which can be a consequence of the so-called "canyon effect". Slope assemblages were overall more uniform than those in the canyon, where there were greater bathymetrical differences in community structure. Densities in the canyon peaked at 1,750 m depth, which did not correspond with the bathymetric gradient in food availability. The deepest canyon station was the most similar to the slope stations in terms of both environmental conditions and nematode communities, suggesting it lied outside the canyon influence. The higher habitat heterogeneity of the canyon (indicated by its greater vertical sediment profile and water depth differences) played a key role in structuring nematode spatial distribution. Independently of the ecosystem, however, the vertical sediment profile proved to be the most determinative factor for density, community structure, and diversity.

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“…The decrease of the yield per recruit, CPUE (catch per unit effort) and mean individual length over the last 20 years is probably a symptom of population changes induced by the intense exploitation (Gorelli et al, 2016). In addition to the impact on the biological communities, studies conducted in this area, within La Fonera (or Palamós) Canyon, have revealed that the trawling gear passing near and along the canyon flanks down to 800 m depth significantly impacts the seafloor .…”

Section: Direct and Indirect Effects Of Fishingmentioning

confidence: 99%

Ecological Role of Submarine Canyons and Need for Canyon Conservation: A Review

et al. 2017

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Submarine canyons are major geomorphic features of continental margins around the world. Several recent multidisciplinary projects focused on the study of canyons have considerably increased our understanding of their ecological role, the goods, and services they provide to human populations, and the impacts that human activities have on their overall ecological condition. Pressures from human activities include fishing, dumping of land-based mine tailings, and oil and gas extraction. Moreover, hydrodynamic processes of canyons enhance the down-canyon transport of litter. The effects of climate change may modify the intensity of currents. This potential hydrographic change is predicted to impact the structure and functioning of canyon communities as well as affect nutrient supply to the deep-ocean ecosystem. This review not only identifies the ecological status of canyons, and current and future issues for canyon conservation, but also highlights the need for a better understanding of anthropogenic impacts on canyon ecosystems and proposes other research required to inform management measures to protect canyon ecosystems.

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Fishing Effort Increase and Resource Status of the Deep-Sea Red Shrimp Aristeus antennatus (Risso 1816) in the Northwest Mediterranean Sea Since the 1950s

Cited by 21 publications

References 29 publications

Accounting for preferential sampling in species distribution models

Accounting for preferential sampling in species distribution models

Role of spatial scales and environmental drivers in shaping nematode communities in the Blanes Canyon and its adjacent slope

Ecological Role of Submarine Canyons and Need for Canyon Conservation: A Review

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