Yong Chen

Yong Chen
University of Maine | UM · School of Marine Sciences

PhD

About

344
Publications
102,078
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6,713
Citations
Citations since 2016
142 Research Items
4321 Citations
20162017201820192020202120220200400600800
20162017201820192020202120220200400600800
20162017201820192020202120220200400600800
20162017201820192020202120220200400600800

Publications

Publications (344)
Article
Climate change is fueling unprecedented warming in marine environments. Crustaceans demonstrate strong physiological responses to rising temperatures including smaller molt increments, more frequent molting, and decreased size-at-maturity (SAM). Despite the potential for these changes to affect population and fisheries dynamics, there is limited re...
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Data-limited methods are being developed rapidly to cater to a range of data types and stock characteristics. One class of these methods is catch-only methods (COMs), which seek to determine stock status based largely, or exclusively, on catch histories. Although catch data are the most common information for a fishery, they are susceptible to larg...
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Understanding and managing fishery selectivity to target species and desirable size are instrumental to fisheries management. China, as the world's largest producer of marine capture fisheries, has been widely perceived to possess unselective domestic fisheries. To date, this perception remains largely anecdotal and conjectural, hindering the devel...
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Crustacean species are socioeconomically and ecologically crucial across the world. For crustaceans, as ectotherms, anthropogenic climate change threatens to significantly alter key life history characteristics, such as size at maturity and growth rate. Because crustaceans are difficult to age, length data are used in assessments of crustacean stoc...
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Co-occurrence patterns of species in spatial and temporal scale can provide insight into how fish species distributions and community structure are determined. Identifying temporal shifts of co-occurrence patterns and the influencing factors is important for biodiversity conservation of fish species. However, the species co-occurrence patterns of f...
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China contributes the largest catches to global marine wild-capture fisheries. The majority of them are harvested from China Seas which are highly productive, but are facing heavy fisheries exploitation. The status of exploited fisheries stocks in China Seas have remained largely unknown due to severe data-limited conditions, which hindered their s...
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Management of marine species often relies on biological reference points (BRPs): threshold and target indicators that trigger management actions. These BRPs are usually based on the biology of the species and rarely consider environmental effects. Under climate change, this is problematic as many biological/physiological relationships are assumed t...
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Hatchery programs are commonly used to enhance fishery stocks, while the efforts to minimize potential negative ecological impacts have grown in recent years. In China, Fenneropenaeus chinensis is a fast-growing, short-lived shrimp species with a high commercial value. F. chinensis fishery is heavily dependent on the hatchery program. We evaluated...
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The massive green tide blooms caused by macroalgae Ulva in the Southern Yellow Sea, China, threaten the local fish populations. However, green tides are not factored into the determination of sustainable fisheries targets, which hinders the achievement of the maximum sustainable yield (MSY). Using a local fishery as a case study we highlighted the...
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Climate changes have increasingly driven diverse biological processes of fish and lead to non-stationary dynamics of populations. The Gulf of Maine (GOM) is vulnerable to climate change, which should be considered in fishery stock assessment and management. This study focuses on the effects of possible non-stationary natural mortality (M) on the st...
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Despite their growing socio-economic importance globally, relatively little is understood about how crustacean stocks are assessed, which has potential to compromise fishery sustainability, especially under heavy exploitation and environmental changes. To inform stock assessment model application for emergent fisheries, we evaluated model use for c...
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Functional stock-recruitment relationships (SRRs) are often difficult to quantify and can differ over space. Additionally, climate change adds to the complexity of recruitment dynamics. This paper's aim was to incorporate spatial heterogeneity and environmental effects on productivity in SRRs with American lobster in the Gulf of Maine (GOM) as a ca...
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Monitoring fishing activities is crucial for marine conservation but challenging in practice, because the ability in tracking fisheries has been limited on varying spatial and temporal scales. The challenge is for both developed and developing countries, and is outstanding in China which is characterized by the world's largest fishing fleet. The ad...
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Small-scale fisheries (SSFs) play a vital role in the sustainability of local economies. Migratory species moving into and out of an ecosystem may influence the dynamics of local fish communities and SSFs. We used the end-to-end model, OSMOSE-JZB (Object-oriented Simulator of Marine ecOSystEms), to evaluate the impacts of fishing and a migratory sh...
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Fisher behavior has been widely considered important for fisheries management, but is often overlooked in China's fisheries management. The current management scheme creates few incentives to survey fishers, leading to limited behavioral information that further hinders decision-makers from accounting for human-nature interactions in management. To...
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Projection models are commonly used to evaluate the impacts of fishing. However, previously developed projection tools were not suitable for China’s fisheries as they are either overly complex and data-demanding or too simple to reflect the realistic management measures. Herein, an intermediate-complexity projection model was developed that could a...
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Single-species fisheries management (SSFM) is applied to many fisheries ecosystems around the world. The associated ecological impacts are usually not well understood due to the lack of considering trophic interactions among species in the ecosystem. This impedes the implementation of SSFM in an ecosystem context and reduces our ability to understa...
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Jumbo squid (Dosidicus gigas) plays an important role in marine ecosystems throughout the eastern Pacific, but the knowledge of its feeding and migration patterns is limited. In this study, we measured stable isotopic values (δ 13 C and δ 15 N) from the edge of lower beak lateral wall to investigate spatio-temporal and trophic ecology of jumbo squi...
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A substantial level of non-target species are often caught in tuna longline fisheries, which can therefore impose a heavy ecological burden on pelagic fish communities. However, limited studies have quantitatively examined the scale of bycatch varying across fishing fleets and areas in regional tuna longline fisheries, as data are often sparse. We...
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Developing fisheries policies based on the best available science (BAS) has been generally required in international agreements and national legal documents in many countries. However, it is difficult to comply with BAS when lacking a uniformly agreed‐upon operational framework. In this study, we conducted an exhaustive literature review and develo...
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Biological reference points (BRPs) derived from per-recruit analyses are commonly used in inferring stock status and serve as the target or threshold in fisheries management. However, the estimation of BRPs may be impacted by the variability in life history processes, and particularly, individual growth rates often display substantial seasonal osci...
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Functional diversity has emerged as a key component of biodiversity in recent two decades, which has been extensively used to assess the health of aquatic ecosystems and predict the responses of fish communities to disturbances. However, sampling intensity may affect the estimation of functional diversity indices and thus lower the validity of func...
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Different approaches have been used to identify fishery stock status when only biomass and catch data are available. However, the performance of the approaches may be affected by the uncertainties derived from different sources (e.g., model misspecification, stock productivity changing, observation error). Here, we propose that the observed biomass...
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Species co-occurrence pattern is fundamental in community ecology. Co-occurrence analysis identifies mechanisms for species coexistence in fish community. Different sampling intensity may result in different patterns at certain scales. In this study we conducted a simulation study to evaluate differences in the three species co-occurrence indices u...
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The biodiversity of the bycatch community in tuna longline fisheries has historically been under-studied. In this study, observer data from 9744 sets of Chinese tuna longline fisheries were used to estimate the biodiversity of the bycatch by applying alpha diversity measures, and their habitat preference was predicted with the Generalized Additive...
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Outliers caused by atypical observation error often occur in fishery data. These outliers have an adverse effect on the parameter estimation for fishery stock assessment models. We tested a robust distribution for identifying and removing outliers from fishery data. We conducted a simulation study in which a surplus production model was used to mim...
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Fisheries‐independent survey data are vital to stock assessment and management because they provide reliable information on stock status. Although survey data have been increasingly recognised for their contributions to fisheries management, they have often not been adequately used to provide quantitative management recommendations for China's fish...
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Aim To address the uncertainty associated with climate‐driven biogeographical changes in commercial fisheries species through an ensemble species distribution modelling (SDM) approach. Location Northeast US Continental Shelf Large Marine Ecosystem (NEUS‐LME). Methods We combined an ensemble SDM platform (BIOMOD 2) and a high‐resolution global cli...
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On November 6, 2019, China and France affirmed their commitments to the establishment of a marine protected area (MPA) in the Southern Ocean right after the close of the 2019 meeting of the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR). In the context of global ocean conservation, their pledge is worth expectation as...
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This study used Ecopath model of the Jiaozhou Bay as an example to evaluate the effect of stomach sample size of three fish species on the projection of this model. The derived ecosystem indices were classified into three categories: (1) direct indices, like the trophic level of species, influenced by stomach sample size directly; (2) indirect indi...
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Species distribution models (SDMs) have been increasingly used to predict the geographic distribution of a wide range of organisms; however, relatively fewer research efforts have concentrated on rare species despite their critical roles in biological conservation. The present study tested whether community data may improve modelling rare species b...
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2020. Rebuilding depleted fisheries towards BMSY under uncertainty: harvest control rules outperform combined management measures. Rebuilding depleted fisheries towards sustainable levels, such as B MSY, is challenging under uncertainty. Although a substantial amount of research has highlighted the importance of accounting for uncertainty in fisher...
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Transferability of species distribution models is crucial for supporting biological conservation and management planning in the face of climate changes; however, there is a lack of understanding in how to achieve transference spatially and temporally, especially in a multispecies circumstance. This study evaluated the roles of model complexity and...
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Varying catchability is a common feature in fisheries and has great impacts on fisheries assessments and species distribution models. However, spatial variations in catchability have been rarely evaluated, especially in the multispecies context. We advocate that the need for multispecies models stands for both challenges and opportunities to handle...
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Sustainable fisheries management is built on effective management strategies and informative data that are usually well defined for data‐rich fisheries. However, their counterparts in data‐limited fisheries remain inadequately evaluated due to insufficient data for stock assessments. This raises two questions: (1) can data‐limited management strate...
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Spatial conservation prioritization concerns trade-offs between marine conservation and resource exploitation. This approach has been increasingly used to devise spatial management strategies for fisheries because of its simplicity in the optimization model and less data requirement compared to complex dynamic models. However, most of the prioritiz...
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Marine protected areas (MPAs) have been increasingly used as a primary tool for fisheries management and conservation. Over the past few decades, the implementation of MPAs has achieved mixed results with regard to conservation goals, which has driven the scientific community to contemplate what factors may determine the effectiveness of an MPA. Mo...
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Seasonal fishing closures are often used in fisheries management to conserve overfished stocks. As one of the unintended consequences, fishermen often contend for maximizing catches immediately after reopening fisheries. The resultant large catch landings in a short time period (i.e., pulse fishing) may undermine the benefit of closure. We implemen...
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Macrozoobenthos survey programs often tend to be costly and time-consuming, which call for the development of cost-effective sampling designs. In this study, ordinary kriging interpolation was used to estimate the values at unsurveyed locations based on macrozoobenthos survey data in tidal flat as the ‘true’ values for this simulation study. Three...
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Full accounting of fisheries mortality is one of the most tractable ways to improve stock assessments. However, it can be challenging to obtain in cases when missing catch comes from small-scale non-target fisheries unrequired to report incidental catch. Atlantic cod (Gadus morhua) in the Gulf of Maine (GoM), USA once served as a regionally importa...
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Ecosystem models are widely advocated for ecosystem-based fisheries management (EBFM). However, the use of ecosystem models is still limited in tactical fisheries management due to large uncertainties that undermine the confidence of stakeholders. Using a Monte Carlo simulation approach, this study quantified the impact of imprecise parameters on p...
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As most exploited fisheries lack a coherent time series of biomass index, development of data-limited stock assessment methods such as stock reduction analysis (SRA), is critical for fishery stock assessment due to their modest data requirements for estimating stock status and overfishing catch limits. In this study, we propose that sporadic time s...
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Co-occurrence pattern of fish species plays an important role in understanding the spatio-temporal structure and the stability of fish community. Species coexistence may vary with time and space. The co-occurrence patterns of fish species were examined using the C-score under fixed-fixed null model for fish communities in spring and autumn over dif...
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Aim Biodiversity prediction becomes increasingly important in the face of global diversity loss, whereas substantial challenges still exist in both conceptual and technical aspects. There exist many predictive models, and an integrative evaluation can help understand their performance in handling the multifacets of biodiversity. This study aims to...
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State-space production models are increasingly being used in fisheries stock assessment as they provide the ability to account for observation and process errors. However, model performance when the population dynamics specified differs from the true biological process requires evaluation. We compared the estimation performance of a standard observ...
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Length composition analysis can provide insights into the dynamics of a fish population. Accurate quantification of the size structure of a population is critical to understand the status of a fishery and how the population responds to environmental stressors. A scientific observer program is a reliable way to provide such accurate information. How...
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The migration route of oceanic squid provides critical information for us to understand their spatial and temporal variations. Mark-recapture and electronic tags tend to be problematic during processing. Cephalopod hard structures such as the beak, containing abundant ecological information with stable morphology and statolith-like sequences of gro...
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Age‐structured data are commonly needed in stock assessments but are unavailable for the majority of existing fisheries, while fish size (length or weight) data are most readily accessible and carry critical information of population status. However, the performances of assessment methods based on size‐frequency data have been less well understood....
Article
Management strategy evaluation (MSE) is an effective tool to evaluate the performance of harvest control rules (HCRs) and alternative management strategies. However, a comprehensive MSE framework advising management is still absent for the severely depleted Gulf of Maine (GoM) cod (Gadus morhua). In the present study, we developed a conceptual MSE...
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We developed a climate-niche species distribution model to evaluate spatiotemporal trends in Atlantic sea scallop (Placopecten magellanicus) along the coastal waters of the Gulf of Maine. We used a Tweedie-generalized additive model (GAM) to quantify the relationships between scallop abundance and key environmental variables. A boosted regression t...
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Isotopic signatures have been extensively used to reconstruct marine organism trophic habitat over their lifetime. In this study, sequential stable isotopic values of δ13C and δ15N in eye lenses were measured to investigate the trophic history of Dosidicus gigas during ontogeny. A total of 281 segments from 33 lenses were examined with δ13C ranging...
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The Humboldt squid Dosidicus gigas has a short life span, and environmental variability plays a significant role in regulating its population dynamics and distribution. An analysis of 1 096 samples of D. gigas collected by the Chinese commercial fishing vessels during 2013, 2014, and 2016 off the Peruvian Exclusive Economic Zone, was conducted to e...
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Changes in bottom-up forcing are fundamental drivers of fish population dynamics. Recent literature has highlighted the need to incorporate the role of dynamic environmental conditions in stock assessments as a key step towards adaptive fishery management. Combining a bioclimate envelope model and a population dynamic model, we propose a model-base...
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This study uses the Maine Department of Marine Resources Lobster Sea Sampling data (2000–2016) and logistic models to develop the first time series for the timing and suddenness of onset of the initial intra‐annual molt of American lobster in the Gulf of Maine (GoM), an annual fishery recruitment event crucial to fishermen. Data from three GoM regi...
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Individual-based models (IBMs) can capture complex processes with a flexible probabilistic approach, which makes them useful for studying organisms with complex life history and fishery processes such as the American lobster (Homarus americanus). This research aims to modify and parameterize an individual-based lobster simulator (IBLS) to simulate th...
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The statolith in cephalopods has a stable morphology and contains important ecological information. Influenced by genetic structures and environmental variability, statolith shapes often vary among different stocks and are ideal indices for stock discrimination. In the present study, wavelet analysis was used to explore the statolith shape variatio...