Yan Jiao

Yan Jiao
Virginia Polytechnic Institute and State University | VT · Department of Fish and Wildlife Conservation

PhD

About

107
Publications
19,473
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
1,018
Citations
Additional affiliations
April 2005 - March 2020
Virginia Polytechnic Institute and State University
Position
  • Professor
Description
  • Started as an Assistant Professor in 2005, being promoted to Associate and then Professor. I mainly work on population dynamics, stock assessment, risk assessment and decision analysis.
January 2004 - April 2005
University of Guelph
Position
  • PostDoc Position

Publications

Publications (107)
Article
Full-text available
Bycatch in fisheries is a major threat to many seabird species. Understanding and predicting spatiotemporal changes in seabird bycatch from fisheries might be the key to mitigation. Inter-annual spatiotemporal patterns are evident in seabird bycatch of the U.S. Atlantic pelagic longline fishery monitored by the National Marine Fisheries Service Pel...
Article
American Shad (Alosa sapidissima), Hickory Shad (A. mediocris), and river herrings (Alewife A. pseudoharengus and Blueback Herring A. aestivalis) are anadromous pelagic fishes, which as adults spend most of the annual cycle at sea, but enter the coastal rivers in spring to spawn. Once as one of the most valuable fisheries along the Atlantic coast,...
Article
Tagging studies have been widely conducted to investigate the movement pattern of wild fish populations. In this study, we present a set of length-based, age-structured Bayesian hierarchical models to explore variabilities and uncertainties in modeling tag-recovery data. These models fully incorporate uncertainties in age classifications of tagged...
Article
Full-text available
Individual growth rates are intrinsically related to survival and lifetime reproductive success and hence, are key determinants of population growth. Efforts to quantify age-size relationships are hampered by difficulties in aging individuals in wild populations. In addition, species with complex life-histories often show distinct shifts in growth...
Article
Full-text available
Biological invasions occur as a multi-stage process and life history traits can change during the invasion process. Blue Catfish Ictalurus furcatus were introduced in three Virginia tidal tributaries of the Chesapeake Bay in the 1970s and 1980s, but have expanded their range to almost all large tributaries of the Bay. Understanding the species’ gro...
Article
Spatial autocorrelation is common in environmental factors, species distributions, and predator-prey interactions. Spatially autocorrelated distribution of prey and strong prey selectivity by predators may cause spatial autocorrelation of the fish diet shown as higher similarity among diets of fish caught nearby or in the same trip. We explore the...
Presentation
Full-text available
The incidental mortality of seabirds in fisheries ranks as the greatest threat impacting seabirds globally. However, its impact on seabird populations may have been substantially underestimated due to lost, undetected bycatch. To estimate the full extent of the bycatch problem, knowledge about the magnitude and the variability of the lost bycatch i...
Article
Full-text available
Sexual and spatio-temporal variations have been observed in the life history parameters of many aquatic species and their causes have been related to harvesting pressure and environmental changes. This study aims to explore sexual, spatial and temporal variation in the growth and maturity through weight-at-length, length-at-age, and maturity-at-len...
Article
Full-text available
As one of the top four commercially important species in China, yellow croaker (Larimichthys polyactis) with two geographic subpopulations, has undergone profound changes during the last several decades. It is widely comprehended that understanding its population dynamics is critically important for sustainable management of this valuable fishery i...
Article
Full-text available
In temperate waters, growth and mortality of bony fishes is frequently estimated from age information derived from examination of annular rings on hard structures (e.g., otoliths). However, determining ages from hard structures can be time consuming, often requires sacrificing fish, and has associated costs for supplies and time of personnel proces...
Article
Seabirds are facing increasing threats in both marine and terrestrial habitats, and many populations have experienced dramatic declines over past decades. Fisheries bycatch is the most pervasive at-sea threat and is of increasing concern in fisheries management and marine conservation. We predicted spatial and temporal heterogeneities of seabird by...
Article
Whitespotted conger (Conger myriaster) is a marine migratory species with important economic and ecological values in Northwestern Pacific. The population status and distribution of whitespotted conger may have changed in the eastern coastal water of China owing to the intensive fishing pressure and human activities in the past few decades. There h...
Article
The excess one pattern in count data has been documented in ecology but it has not been explicitly modeled or examined. In this study, we introduce a k-aggregated transformation of discrete distributions to better model count data with excess ones in a Bayesian generalized linear model framework and demonstrate its use with two groups of case studi...
Article
Full-text available
Not much is known about the fleet level total seabird bycatch from pelagic longlines of United States vessels in the western North Atlantic or other fleets of the Atlantic or other oceans. Onboard observers generally only record seabird bycatch during line hauling. Seabirds are predominantly caught during the line setting stage, and, due to predati...
Article
Full-text available
Background: Global regression models under an implicit assumption of spatial stationarity were commonly applied to estimate the environmental effects on aquatic species distribution. However, the relationships between species distribution and environmental variables may change among spatial locations, especially at large spatial scales with compli...
Preprint
Background: Global regression models under an implicit assumption of spatial stationarity were commonly applied to estimate the environmental effects on aquatic species distribution. However, the relationships between species distribution and environmental variables may change among spatial locations, especially at large spatial scales with complic...
Preprint
Full-text available
Background: Global regression models under an implicit assumption of spatial stationarity were commonly applied to estimate the environmental effects on aquatic species distribution. However, the relationships between species distribution and environmental variables may change among spatial locations, especially at large spatial scales with complic...
Article
The seasonality of water levels in large river‐floodplain ecosystems, known as flood pulses, influence the dynamics of fish populations and associated catches. Various flood pulse variables (e.g. maximum stage) have been correlated to catches of river‐floodplain fishes, but no study to date has assessed the effects of various flood pulse variables...
Technical Report
Full-text available
Annual predictions of seabird bycatch in the U.S. Atlantic pelagic longline fishery were updated up to 2017 based on observer and logbook data. From 1992 to 2017, the NMFS Pelagic Observer Program (POP) documented 19,811 longline set operations, with 165 seabirds captured in 92 sets. The overall nominal bycatch rate was 0.0083 seabirds per set and...
Article
One prerequisite for sustainable fisheries management is to match management actions with biological processes. Stocks are fundamental units for fisheries management. Understanding the spatial structure of fish stocks is critical for conducting defensible stock assessments, applying efficient management strategies, and ensuring the sustainability o...
Article
Full-text available
In the 1970s and 1980s, blue catfish (Ictalurus furcatus) were introduced to the tidal rivers of Virginia. High abundances and uncertainty about population characteristics of blue catfish generated concern for economically important and imperiled species. We estimated natural mortality and size structure for four tidal river systems (i.e. James, Ma...
Article
Full-text available
Exploring species-environment relationships to identify essential habitat areas is recognized as an effective way for resource conservation and management. Because of ecological and economic importance of Yellow Perch (Perca flavescens) in Lake Erie, it is essential to develop appropriate habitat models to analyze habitat supply of this species. Em...
Technical Report
Full-text available
Blue Catfish Ictalurus furcatus were introduced in the James, and Rappahannock Rivers over forty years ago and in the York drainage thirty years ago. Blue Catfish have since expanded into all major Virginia and many Maryland tributaries of the Chesapeake Bay. In August 2011, the Atlantic States Marine Fisheries Commission (ASMFC) approved a Resolut...
Article
Understanding the spatial and temporal variability in life-history traits among populations is essential for the management of recreational fisheries. However, valuable freshwater recreational fish species often suffer from a lack of catch information. In this study, we demonstrated the use of an approach to estimate the spatial and temporal variab...
Article
Full-text available
In this study, length-weight relationships and relative condition factors were analyzed for Yellow Croaker (Larimichthys polyactis) along the north coast of China. Data covered six regions from north to south: Yellow River Estuary, Coastal Waters of Northern Shandong, Jiaozhou Bay, Coastal Waters of Qingdao, Haizhou Bay, and South Yellow Sea. In to...
Data
Yield of Yellow Croaker in China. Data were derived from China Fishery Statistical Yearbook from 1956 to 2012. (TIF)
Data
Parameters a and b distributions among regions and years. A and B plots were parameters variation among regions, with C and D plots among years. B and D plots zoom the main parts with high frequency. (TIF)
Data
Length frequency of Yellow Croaker. (TIF)
Data
Monthly sample size of Yellow Croaker among regions and years. The detailed information of regions presents in Table 1; no individuals were caught during February, March and April. (DOCX)
Data
Condition factors of Yellow Croaker relative to reference year of 1960, 1986 and 2007, and the references LWR models. See the text for the definition of Kcur/1960, Kcur/1960 and Kcur/2007. (DOCX)
Data
LWR differences of Yellow Croaker among regions and years from the LMEM (R&Y.I&S). a, b, and c were plots among regions; d, e, and f were plots among years. a and d plots cover the whole range of length; b and e plots cover the median part (Length = 12–16 cm); c and f plots cover the large size (Length = 16–22 cm). (TIF)
Data
Distribution of condition factors relative to reference years of 1960 (A), 1986 (B), 2005(C), 2007 (D), 2008~2009(E) and 2010(F). (TIF)
Article
Full-text available
Understanding and monitoring life history traits is often important in endangered species conservation. Populations of the endangered mussel Cumberlandian combshell Epio - blasma brevidens have continued to decline in the Powell River, USA. Understanding and modeling mussel growth is critical for effective reintroduction of this endangered species....
Article
Full-text available
Inferring growth for aquatic species is dependent upon accurate descriptions of age-length relationships, which may be degraded by measurement error in observed ages. Ageing error arises from biased and/or imprecise age determinations as a consequence of misinterpretation by readers or inability of ageing structures to accurately reflect true age....
Article
Geographically weighted regression (GWR) is a relatively new technique to explore spatially-varying relationships between biological and environmental processes. It allows parameters to vary over space and assumes data to follow a normal distribution. We extend GWR to a geographically weighted generalized linear model (GW-GLM) by incorporating stat...
Article
Full-text available
With the observer data from the National Marine Fisheries Service Pelagic Observer Programme (POP) and the logbook data from the US Atlantic pelagic longline fishery, we estimated the seabird bycatch in the fishery during 1992–2012. The POP observed 13 847 longline sets, with a total of 141 seabirds captured on 74 sets. The overall nominal catch ra...
Technical Report
Full-text available
Annual estimates of seabird bycatch in the U.S. Atlantic pelagic longline fishery were updated up to 2014. From 1992 to 2014, the NMFS Pelagic Observer Program (POP) documented 16,581 longline set operations, with 145 seabirds captured in 78 sets. The overall nominal bycatch rate was 0.0087 seabirds per set and 0.0121 birds per one thousand hooks....
Article
In many marine fisheries assessments, population abundance indices from surveys collected by different states and agencies do not always agree with each other. This phenomenon is often due to the spatial synchrony/asynchrony. Those indices that are asynchronous may result in discrepancies in the assessment of temporal trends. In addition, commonly...
Article
Full-text available
The hydroperiod of ephemeral wetlands is often the most important characteristic determining amphibian breeding success, especially for species with long development times. In mesic and wet pine flatwoods of the southeastern United States, ephemeral wetlands were a common landscape feature. Reticulated flatwoods salamanders (Ambystoma bishopi), a f...
Data
Area and maximum depth (2005–2014) of 17 pine flatwoods wetlands. (XLSX)
Data
Water depth measurements from 17 pine flatwoods wetlands over a 9-year period. (XLSX)
Article
Global regression techniques that assume spatial stationarity are usually used to study the interaction between aquatic species distribution and habitat variables. In the present study, a local regression model, named geographically weighted regression (GWR), was used to question the spatial stationarity assumption in exploring the relationships be...
Article
Full-text available
Information about Grass Carp Ctenopharyngodon idella survival would be useful for improving the management of fish used for aquatic weed control. Reliable methods for estimating annual poststocking survival of Grass Carp from radiotelemetry data do not exist because the fish remain sedentary for prolonged periods between movements, giving the false...
Article
Full-text available
The association of species distribution and environmental variables is often complex, with nonlinear and interacting effects. Bayesian hierarchical models can quantify linear and high order effects of the variables, as well as their interaction effects. Their strength is to take into account the uncertainties in observation, models, and parameters....
Article
Full-text available
The association of species distribution and environmental variables is often complex, with nonlinear and interacting effects. Bayesian hierarchical models can quantify linear and high order effects of the variables, as well as their interaction effects. Their strength is to take into account the uncertainties in observation, models, and parameters....
Article
Full-text available
The federally endangered Cumberlandian combshell (Epioblasma brevidens) was propagated and reared to taggable size (5–10 mm), and released to the Powell River, Tennessee, to augment a relict population. Methodology using passive integrated transponder (PIT) tags on these mussels greatly facilitated the detection process. The overall mean detection...
Conference Paper
Full-text available
A series of alternative state-space surplus production models were used to estimate biological reference points, i.e., FMSY and BMSY, and their uncertainty, for the Lake Nipigon lake whitefish fishery. We estimated the historic and current status of this fishery and found that both the reference point estimates and stock status were highly uncertai...
Conference Paper
Long term nonstationary population dynamics are rarely applied in reality. The reasons include both the difficulty in solving the nonstationary models and the presence of the missing historical data. Atlantic weakfish (Cynoscion regalis) is one of the important fisheries along Atlantic coast. As for many fisheries, stationary models have been used...
Article
The effects of algal density, water flow and substrate type on the survival and growth of newly metamorphosed juveniles of the rainbow mussel (Villosa iris) were investigated in 40 l recirculating culture systems. A split-plot design with a whole plot factor combining algal density and water flow, and a split-plot factor of substrate were applied i...
Conference Paper
Incorporation of spatial dependence in bycatch modeling has been challenging because the bycatch data usually contain high percentage of zero observations and involve large dataset that may require intensive computing. The eigenfunction-based spatial filtering provides a flexible tool that allows the existing bycatch modeling approaches such as the...
Article
a b s t r a c t Generalized linear models (GLMs) and generalized additive models (GAMs) are commonly used to stan-dardize catch rates as relative abundance indices in fisheries stock assessments. Spatial interpolation (SI) is an alternative way to estimate relative abundance indices but there have been no comparisons of the effectiveness of the two...
Article
Full-text available
In weed control plans that use Grass Carp Ctenopharyngodon idella for intermediate control of hydrilla Hydrilla verticillata, the knowledge of population dynamics improves efficacy of management. Our objective was to characterize growth, mortality, and associated population metrics of long-lived (up to 16 years) triploid Grass Carp that were increm...
Chapter
Natural resource modeling of fisheries is called stock assessment and is crucial for proper fisheries management. This paper reviews the commonly used models, the data needed, and the parameter estimation methods for these models in fisheries stock assessment. Fisheries management strategy evaluation and decision analysis, which are based on the mo...
Article
Full-text available
Jiao, Y., Smith, E. P., O'Reilly, R., and Orth, D. J. 2012. Modelling non-stationary natural mortality in catch-at-age models. – ICES Journal of Marine Science, 69: 105–118. Non-stationarity in the natural mortality of many species has been discussed among research scientists, but no generally applicable models/methods have been developed where a s...
Conference Paper
Many shark populations have significantly declined globally in the last few decades. Reasons that led to this alarming situation have been considered to be the slow intrinsic rates of increases of the shark populations and overexploitation from the directed-shark fishery and bycatch. Studies that can help to understand the fishery status and the in...
Conference Paper
The oyster mussel (Epioblasma Capsaeformis) has declined 80% during the last several decades and is now listed as a federally endangered freshwater bivalve of United States. The restoration of the oyster mussel population is urgently needed. However, some vital rates, such as mortality rates, fertility rate and recruitment rate, are still poorly un...
Conference Paper
Full-text available
A method for estimating time-based instantaneous total mortality rate (Z) from multiple cohort catch per unit effort (CPUE) data was developed. The Zs in different n continuous years, which were assumed constant in each n year, were estimated using the age-based CPUE data within these years. Our simulation study found that the trends of the estimat...
Data
Full-text available
Recent studies suggest that use of circle hooks can reduce the incidental mortality of some marine fishes and sea turtles in longline fisheries. Analysis of data from the US National Marine Fisheries Service Pelagic Observer Program (POP) revealed a significant hook effect on seabird bycatch. Our analysis focused on the three areas with highest sea...