North American Journal of Fisheries Management最新文献

{"title":"Multiscale population demographics and growth responses of trout in the upper Snoqualmie River watershed, Washington","authors":"J. Thompson, Nathanael C. Overman","doi":"10.1002/nafm.10928","DOIUrl":"https://doi.org/10.1002/nafm.10928","url":null,"abstract":"Population demographics of trout were analyzed across multiple spatial scales to evaluate fishery resources in the three forks and main stem of the upper Snoqualmie River, Washington. Physical habitat and trout species compositions, relative abundances, and sizes were assessed through spatially continuous sampling of the watershed. Fish were also sampled at the segment scale (5–20 km) for more detailed but spatially intermediate assessments of species and genetic origin, size at age, and seasonal diet. To evaluate growth conditions during summer months, bioenergetics simulations of consumption by trout were run using summer water temperatures, and growth and diets were sampled at two life stages.We found high variability in longitudinal species compositions, genetic origins, relative abundances, and densities within and among forks. While annual growth generally decreased with distance upstream, summer growth efficiency consistently increased. Areal density estimates of age‐0 recruits in the North and Middle forks generally increased with segment elevation, whereas density of recruits was relatively low in upper elevations of the South Fork, where nonnative Westslope Cutthroat Trout Oncorhynchus clarkii lewisi were most abundant. Abundance of trout varied widely among the forks, and a native metapopulation of Coastal Cutthroat Trout Oncorhynchus clarkii clarkii was the most abundantly distributed species across interconnected main‐stem habitats.Factors affecting population demographics of trout at the riverscape scale included geologic barriers, habitat diversity, and stocking practices, while summer growth was primarily affected by water temperature. Merging riverscape‐ and intermediate‐scale sampling enhanced watershed‐scale inferences made from intermediate sampling while accounting for continuous variability. This design provided a holistic assessment of the trout resources that would not have been possible using either site‐specific sampling or continuous longitudinal surveys and provided a baseline assessment of trout resources in the upper Snoqualmie River watershed for continued management and conservation of the fishery.","PeriodicalId":19263,"journal":{"name":"North American Journal of Fisheries Management","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42874168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Adult Sea Lamprey approach and passage at the Milford Dam fishway, Penobscot River, Maine, United States","authors":"E. Peterson, Rex Thors, D. Frechette, J. Zydlewski","doi":"10.1002/nafm.10919","DOIUrl":"https://doi.org/10.1002/nafm.10919","url":null,"abstract":"Sea Lamprey Petromyzon marinus provide important ecological services within their native range, such as nutrient cycling, and can also act as a prey source for other species. Adult Sea Lamprey must access freshwater rivers to spawn, and because of this they are susceptible to changes in river connectivity. Human‐made structures, such as dams, can exclude them from usable habitat. Sea Lamprey dam passage has not been extensively studied in Maine, despite Maine being within the native range of this species. The goals of this study were to evaluate upstream passage efficiency at the Milford Dam on the Penobscot River, Maine, and to provide comprehensive information about adult Sea Lamprey passage at five other dams throughout the Penobscot River watershed.In 2020–2021 we captured and tagged 150 Sea Lamprey at the Milford Dam, the lowest dam in the Penobscot River, Maine, and displaced them downstream to assess passage efficiency at this dam and five upstream dams. In 2020, 50 Sea Lamprey were released on the east shore of the river downstream of Milford Dam; in 2021, the east shore release was repeated with an additional 50 fish and another 50 fish were released on the west shore.Between 70–82% of Sea Lamprey were observed passing Milford Dam again after mean delay times of 9–11 days. The release location did not affect dam passage success or the amount of time that was required to locate and use the passage structures. Sea Lampreys from both release groups were equally likely to approach the entrance to the fishway upon returning to Milford Dam, despite the fishway being located against the eastern shore of the river. However, high flows shortly after release may have resulted in higher attraction to the fishway in 2020. Passage success at dams upstream of Milford was highly variable. All Sea Lamprey were able to successfully navigate past West Enfield Dam (100% passage, n = 63), whereas Brownsmill Dam apparently acted as a complete barrier to further migration (0% passage, n = 7). Fish from all years and release groups together had a median upstream migration distance of 38.8 km after fish had passed Milford Dam, and a maximum observed upstream travel distance of approximately 100 km, indicating that most tagged Sea Lamprey ended their migration in the vicinity of a dam.The results of this study indicate that Sea Lamprey have high passage efficiency at the Milford Dam and highlight areas within the Penobscot River basin—such as the Brownsmill Dam—where passage facilities are currently inadequate for Sea Lamprey.","PeriodicalId":19263,"journal":{"name":"North American Journal of Fisheries Management","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48770439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluating bycatch avoidance in the US Atlantic Sea Scallop fishery","authors":"B. Lowman, C. O’Keefe, S. Cadrin","doi":"10.1002/nafm.10948","DOIUrl":"https://doi.org/10.1002/nafm.10948","url":null,"abstract":"The effectiveness of bycatch avoidance programs relies on changes in fishing behavior in response to spatiotemporal information on bycatch patterns. We evaluated effectiveness of a voluntary bycatch avoidance program in the US Sea Scallop Placopecten magellanicus fishery over the course of four years based on fishing behavior relative to bycatch advisories. We compared results from self‐reported catch to data from a mandatory observer program for participating and non‐participating vessels in the bycatch avoidance program. Significant associations between bycatch advisories and fishing locations indicated bycatch avoidance behavior, while accounting for the effect of sea scallop density on fishing location decisions. Evidence of avoidance behavior was stronger in earlier years of the program and varied spatially. Decreasing avoidance behavior coincided with revised bycatch management measures, which appear to have altered the incentives for bycatch avoidance. We found differences in the fishing behavior of fishing captains who participated in the bycatch avoidance program when Yellowtail Flounder Limanda ferruginea bycatch was perceived to threaten economic yield due to fishery closures. This case study addresses the analytical challenge of detecting bycatch avoidance behavior and relative effectiveness for bycatch mitigation.","PeriodicalId":19263,"journal":{"name":"North American Journal of Fisheries Management","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46048386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Lake Trout population dynamics in the Northern Refuge of Lake Michigan: Importance of stocking rate","authors":"C. P. Madenjian, Patricia M. Dieter, T. J. Desorcie, Stephen A. Lengnick, T. P. O'Brien, Lynn M. Benes, Steven A. Farha, Benjamin S. Leonhardt","doi":"10.1002/nafm.10915","DOIUrl":"https://doi.org/10.1002/nafm.10915","url":null,"abstract":"The Northern Refuge of Lake Michigan was established under the auspices of the Great Lakes Fishery Commission in 1985 as an additional step toward restoring a self‐sustaining Lake Trout Salvelinus namaycush population to the lake. The overall goal of our study was to assess progress toward Lake Trout rehabilitation in the Northern Refuge through 2021.We conducted annual (1992–2021) gill‐net surveys in the fall to assess the adult population and beam trawl surveys in the spring to assess naturally reproduced age‐0 Lake Trout.Spawner abundance averaged 45 fish • 305 m of gill net−1 • day−1 during 1992–1999, just 4 fish • 305 m of gill net−1 • day−1 during 2000–2014, and then 67 fish • 305 m of gill net−1 • day−1 during 2018–2021. Sea Lamprey Petromyzon marinus wounding rate decreased by nearly 90% between the 2000–2014 and 2015–2021 periods. The average annual mortality rate of adult Lake Trout decreased from 43% during the 1990s and 2000s to 22% during 2015–2021. All of these population dynamics were partly driven by changes in Lake Trout stocking rates, which declined by roughly 50% during 1994–1996 but then increased roughly twofold during 2006–2010 and remained at this higher level during 2010–2018. In 2021, early signs of natural recruitment of Lake Trout became evident. Beam trawling during June 2021 yielded a wild age‐0 Lake Trout, the first ever caught since the surveys began in 1992. In addition, 15 (4% of total catch) of the Lake Trout caught in the fall 2021 gill‐net survey were unclipped (wild) fish. Estimated ages of these wild fish indicated that natural recruitment had begun sometime around 2015.With Alewife Alosa pseudoharengus abundance in Lake Michigan at record low levels, Sea Lamprey wounding rate greatly reduced, and Lake Trout spawner abundance at relatively high levels, the outlook for Lake Trout rehabilitation in the Northern Refuge holds promise.","PeriodicalId":19263,"journal":{"name":"North American Journal of Fisheries Management","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44761180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improving electronic reporting rates in the U.S. recreational fishery for Atlantic Bluefin Tuna","authors":"W. M. Goldsmith, A. Scheld, Christopher H. McGuire, C. Lobue","doi":"10.1002/nafm.10929","DOIUrl":"https://doi.org/10.1002/nafm.10929","url":null,"abstract":"In recent years, electronic self‐reporting has emerged as a potentially powerful tool for timely collection of catch and effort data from recreational fisheries. Such approaches are particularly critical given that recreational fisheries contribute significantly to fishing mortality for popular marine fish species in North America and elsewhere. However, many self‐reporting programs are voluntary and struggle with angler recruitment and retention, while those that are mandatory have demonstrated mixed success with angler compliance. In this study, we surveyed Massachusetts anglers in the recreational fishery for Atlantic Bluefin Tuna Thunnus thynnus; anglers in this fishery are required to report all landings and dead discards, but compliance has historically been poor.The survey assessed respondents' Bluefin Tuna fishing experience and behavior, opinions about self‐reporting, and views on the effectiveness of various strategies to increase self‐reporting rates. Because we had access to past reporting history, we were able to compare responses between those who had previously reported Bluefin Tuna and those who had not.We achieved a response rate of 21.9%, and by comparing survey responses with past reporting history, we estimated a reporting compliance rate of only about 42%. Surprisingly, responses to survey questions generally did not differ markedly between reporters and nonreporters, although we did find evidence that those who complied with the self‐reporting requirement had less faith in the Bluefin Tuna fishery's management process. Among the top strategies identified by respondents to increase reporting compliance were (1) providing incentives; (2) providing behavioral “nudges,” such as reminders; (3) better educating anglers on the benefits of self‐reporting; (4) increasing the user‐friendliness of the reporting technology; and (5) the reframing of norms through leveraging leaders in the fishery.Our findings can help to inform self‐reporting and other citizen science approaches to maximize the quantity and quality of recreational data collected, in turn informing the sustainable management of this sector.","PeriodicalId":19263,"journal":{"name":"North American Journal of Fisheries Management","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47327111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Efficacy of one‐time rotenone application for Westslope Cutthroat Trout restoration in Boulder Creek, Montana","authors":"J. Lampton, Ryan P. Kovach, J. Dunnigan","doi":"10.1002/nafm.10918","DOIUrl":"https://doi.org/10.1002/nafm.10918","url":null,"abstract":"Although piscicides are an important tool for native fish management, our understanding of native fish population dynamics posttreatment (i.e., in putatively vacant habitat) is limited.Here, we describe long‐term trends in size and abundance of Cutthroat Trout Oncorhynchus clarkii in Lower Boulder Lake and Boulder Creek (Montana).No significant differences were found before and after treatment with rotenone in mean length and population density in Boulder Creek. Posttreatment genetic samples from Boulder Lake and upper Boulder Creek consisted entirely of the Westslope Cutthroat Trout Oncorhynchus clarkii lewisi used to refound the population. Middle and lower Boulder Creek genetic samples contained 99.4% and 98.4% Westslope Cutthroat Trout, indicating that some nonnative (Yellowstone Cutthroat Trout Oncorhynchus clarkii bouvieri hybrid) fish survived the treatment. Population demographics showed robust recovery posttreatment; however, genetic results revealed the limitations of a one‐time treatment—that is, an incomplete fish kill.We demonstrate that Cutthroat Trout populations achieve recovery after rotenone treatment in the long term, but one‐time rotenone treatments on large drainages often fail to totally eradicate populations. Therefore, managers should plan on multiple treatments and utilize environmental DNA to help achieve total removal of target species.","PeriodicalId":19263,"journal":{"name":"North American Journal of Fisheries Management","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47766614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Using otolith microchemistry to determine natal origin of Black Sea Bass off the coast of Maine","authors":"E. Koob, L. Kerr, J. Mandelman, Michael P. Armstrong","doi":"10.1002/nafm.10927","DOIUrl":"https://doi.org/10.1002/nafm.10927","url":null,"abstract":"A recent expansion of the northern stock of Black Sea Bass Centropristis striata into the northern Gulf of Maine raises questions about this species’ movement and population dynamics in this region. Determining the origin of these fish is essential, as dramatic changes in migration patterns or current population boundaries could have profound effects on stock assessment estimates and subsequent management regulations.In this study, we measured otolith core concentrations of stable isotopes (δ18O, δ13C) and trace element:calcium ratios (Mg:Ca, Mn:Ca, Cu:Ca, Zn:Ca, Ba:Ca, Sr:Ca) to assess the natal origin of Black Sea Bass that were caught off the coast of Maine. Spawning condition adults from southern New England (SNE) and the mid‐Atlantic Bight (MAB) were used to characterize the chemical fingerprint of these known spawning regions.Unique chemical fingerprints were identified for fish from SNE and the MAB, with high reclassification success using random forest analysis (16% error rate). The classification of Black Sea Bass of unknown origin that were caught in Maine waters indicated that 85% of the samples matched to SNE and 13% to the MAB, whereas one sample remained unclassified.Results from this study support the current management population separation of the northern stock of Black Sea Bass between SNE and the MAB and lends additional information to the understanding of this species’ movement into the northern Gulf of Maine. As fish stocks around the world continue to shift into new regions due to climate change, knowledge of their natal origin will be critical to long‐term sustainable management of this species.","PeriodicalId":19263,"journal":{"name":"North American Journal of Fisheries Management","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43443985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Conservation at the nexus of niches: Multidimensional niche modeling to improve management of Prairie Chub","authors":"Zachary D. Steffensmeier, S. Brewer, Maeghen Wedgeworth, T. Starks, Anthony W. Rodger, Erin Nguyen, J. Perkin","doi":"10.1002/nafm.10860","DOIUrl":"https://doi.org/10.1002/nafm.10860","url":null,"abstract":"A central challenge in applied ecology is understanding how organisms are spatially and temporally distributed and how management might be tailored to maintain or restore species distributions. The niche concept is central to understanding species distributions, but the diversity of niche definitions requires that multiple dimensions be considered. For example, the Grinnellian niche concept focuses on environmental conditions that allow species to persist, the Eltonian niche concept stresses the influence of biotic interactions, and the fundamental niche concept considers both abiotic and biotic environmental features to define spaces that organisms could occupy.We combined abiotic (A), biotic (B), and movement (M) information (collectively, BAM model) to map the multidimensional niche of Prairie Chub Macrhybopsis australis, a regionally endemic freshwater fish currently under review for listing under the Endangered Species Act. We estimated A using remotely sensed environmental riverscape variables, B using the spatial distribution of a hybridization zone between Prairie Chub and Shoal Chub M. hyostoma, and M using data from a mark–recapture study.The BAM model estimated the spatial extent of multiple niches, including the Grinnellian (A; extent = 944 km of river), Eltonian (B; 2974 km), and fundamental niche (overlap of A + B; 645 km) niches. When A, B, and M components were combined, the estimated extent of the Prairie Chub niche was 645 km.Our work shows that the realized, multidimensional niche of Prairie Chub includes medium to large rivers with high habitat connectivity in the upper–middle Red River basin upstream of the distribution of Shoal Chub. The current Prairie Chub distribution could be maintained by preventing further habitat fragmentation and maintaining the environmental gradient separating Prairie Chub from Shoal Chub. Expansion of the species distribution may be possible through restoration of longitudinal fluvial connectivity.","PeriodicalId":19263,"journal":{"name":"North American Journal of Fisheries Management","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45535121","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Conservation decision support for Silver Chub habitat in Lake Erie","authors":"J. E. Mckenna","doi":"10.1002/nafm.10843","DOIUrl":"https://doi.org/10.1002/nafm.10843","url":null,"abstract":"Conservation and restoration of aquatic species is difficult, especially for rare species, because their habitats are typically disturbed, obscuring the natural ability of the habitat to support each species. The Lake Erie population of Silver Chub Macrhybopsis storeriana struggles to sustain itself in a habitat disturbed by a wide spectrum of anthropogenic factors. Application of multiple model predictions can provide indications of conservation or restoration opportunities for this species.A combination of models that predict the best potential for Lake Erie habitat to support Silver Chub and the effects of anthropogenic disturbances on that population were used to identify habitat conditions throughout the western aquatic lake unit.As many as 76 combinations of best habitat potential and disturbance conditions were present, but the best opportunities occurred in <12% of the study area. Some of the best protection opportunities were farthest offshore, and extensive areas of least disturbed habitat for restoration were near the southern and western shores. The location‐specific model predictions provide fine‐scale decision support for Silver Chub habitat protection or restoration.The approach applied here may help identify compatibilities among species to achieve the desirable fish community for Lake Erie and reconcile conflicting management actions.","PeriodicalId":19263,"journal":{"name":"North American Journal of Fisheries Management","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47197692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Genetic analysis reveals a complex mosaic of admixture in Brook Trout in a historically fragmented watershed","authors":"Jared B. Lamy, Brigid C. O'donnell, A. Villamagna, Tyson R. Morrill, Ben J. Nugent, Joshua C. Hoekwater","doi":"10.1002/nafm.10906","DOIUrl":"https://doi.org/10.1002/nafm.10906","url":null,"abstract":"Assess how historical fragmentation in the form of perched culverts impacts Brook Trout Salvelinus fontinalis genetic diversity and differentiation in the Beebe River watershed (central New Hampshire), the site of a major culvert removal project in 2017.We collected genetic samples from Brook Trout one year prior to (2016), and two years following (2018 and 2019) culvert removal from six tributaries in the watershed. We used two analytical approaches, STRUCTURE and discriminant analysis of principal components, to determine the degree to which admixture was occurring and the levels of genetic diversity in the sampled populations. We also compared pairwise FST values to measure the genetic differentiation between tributaries.The analysis revealed that the tributaries with impassable culverts (GR1, GR3, and GR5) exhibited a distinct genetic cluster, indicating genetic homogeneity. In contrast, the tributaries without barriers (GR2, ECR1, and GR4) showed a mixture of individuals assigned to multiple genetic clusters, indicating genetic admixture and high diversity. Culvert outlet drop heights correlated with the level of genetic differentiation and diversity. Culvert replacement did not immediately result in significant changes in the genetic composition of the Brook Trout populations. Fish in tributaries with culverts remained genetically distinct from those in other tributaries even two years after culvert removal.The study demonstrates that historical fragmentation caused by culverts has influenced the population genetic structure of Brook Trout in the Beebe River watershed. Culvert replacement did not lead to immediate changes in genetic composition, suggesting that other factors, such as prespawning behavior and geomorphological disturbances, may have limited fish movement and spawning after culvert removal. The findings highlight the importance of considering the specific characteristics of culverts and their interactions with habitat conditions in assessing their impacts on genetic connectivity.","PeriodicalId":19263,"journal":{"name":"North American Journal of Fisheries Management","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49037759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}