Sabrina G. Beyer, Susan M. Sogard, David M. Stafford, Neosha S Kashef, Abel Rodriguez, Suzanne H. Alonzo, John C. Field
Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print. Successful reproduction is critical to the growth and persistence of marine fish populations, yet how changes in the environment influence reproduction remains largely unknown. We explored how shifting ocean conditions influenced larval production in four species of long-lived, live-bearing rockfish (Sebastes spp.) in the California Current. Brood fecundity, body size, and environmental information were analyzed from the mid-1980s through 2020. Interannual variation in brood fecundity was greater than 50% in the single-brooding yellowtail rockfish (S. flavidus) and widow rockfish (S. entomelas). Brood fecundity varied less in chilipepper (S. goodei) and bocaccio (S. paucispinis), two species capable of multiple broods per year. In these two species, interannual fecundity variability is more likely to depend on the number of broods produced than on brood size alone. In all four species, brood fecundity was positively correlated with maternal length and body condition. Variable ocean conditions influenced the strength of maternal size effects by year. These results provide evidence for reproductive plasticity and environmental effects on fecundity, with implications for changes in population reproductive potential with climate change.
加拿大渔业和水产科学杂志》（Canadian Journal of Fisheries and Aquatic Sciences），提前印刷。 成功的繁殖对海洋鱼类种群的增长和持久性至关重要，但环境变化如何影响繁殖在很大程度上仍是未知数。我们探讨了海洋条件的变化如何影响加利福尼亚洋流中四种长寿、活产石首鱼（Sebastes spp.）的幼虫生产。我们分析了从 20 世纪 80 年代中期到 2020 年的育雏繁殖率、体型和环境信息。单喙黄尾岩鱼（S. flavidus）和鳏夫岩鱼（S. entomelas）的育雏繁殖力年际变化超过 50%。辣椒石首鱼（S. goodei）和大鳞石首鱼（S. paucispinis）的育雏繁殖力变化较小，这两个鱼种每年可繁殖多窝。在这两个物种中，年际繁殖力的变化更有可能取决于产仔数，而不仅仅是产仔数。在所有四个物种中，产仔数与母体长度和身体状况呈正相关。不同年份的海洋条件会影响母体大小效应的强度。这些结果为生殖可塑性和环境对繁殖力的影响提供了证据，并对随着气候变化种群繁殖潜力的变化产生了影响。
{"title":"Shifting ocean conditions influence temporal variation in the fecundity of California Current rockfishes (Sebastes spp.)","authors":"Sabrina G. Beyer, Susan M. Sogard, David M. Stafford, Neosha S Kashef, Abel Rodriguez, Suzanne H. Alonzo, John C. Field","doi":"10.1139/cjfas-2023-0253","DOIUrl":"https://doi.org/10.1139/cjfas-2023-0253","url":null,"abstract":"Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print. <br/> Successful reproduction is critical to the growth and persistence of marine fish populations, yet how changes in the environment influence reproduction remains largely unknown. We explored how shifting ocean conditions influenced larval production in four species of long-lived, live-bearing rockfish (Sebastes spp.) in the California Current. Brood fecundity, body size, and environmental information were analyzed from the mid-1980s through 2020. Interannual variation in brood fecundity was greater than 50% in the single-brooding yellowtail rockfish (S. flavidus) and widow rockfish (S. entomelas). Brood fecundity varied less in chilipepper (S. goodei) and bocaccio (S. paucispinis), two species capable of multiple broods per year. In these two species, interannual fecundity variability is more likely to depend on the number of broods produced than on brood size alone. In all four species, brood fecundity was positively correlated with maternal length and body condition. Variable ocean conditions influenced the strength of maternal size effects by year. These results provide evidence for reproductive plasticity and environmental effects on fecundity, with implications for changes in population reproductive potential with climate change.","PeriodicalId":9515,"journal":{"name":"Canadian Journal of Fisheries and Aquatic Sciences","volume":"133 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141063349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Joelle D. Young, Hamdi Jarjanazi, Michelle E. Palmer
Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print. Large lakes, such as Lake Simcoe, Ontario, Canada, are undergoing significant change due to local and global stressors. Uni- and multivariate analyses of Lake Simcoe's zooplankton community from 1986 to 2012 indicated multiple events of ecosystem change that were synchronous across three lake stations. In the mid-1990s, shifts in zooplankton species abundance and richness, and total cladoceran body size were strongly correlated with the invasion of the zooplanktivore, Bythotrephes cederstroemii. In the early 2000s, additional shifts in zooplankton abundance, as well as copepod body size, coincided with increased water clarity (linked to filter feeding by the invader Dreissena polymorpha) and hypolimnetic water temperature. Further community changes occurred in the 2000s when Bythotrephes declined and many vulnerable cladoceran species recovered. However, the Lake Simcoe community did not fully return to its pre-invasion state as the cold-water herbivores, Daphnia longiremis and Daphnia pulicaria, remained absent. The Lake Simcoe zooplankton community illustrates ongoing ecosystem change that propagated throughout the lake food web and may be reflected in other lakes experiencing global stressors of climate change and species invasions.
{"title":"Multiple signs of ecosystem change in the zooplankton community of a large temperate lake","authors":"Joelle D. Young, Hamdi Jarjanazi, Michelle E. Palmer","doi":"10.1139/cjfas-2023-0138","DOIUrl":"https://doi.org/10.1139/cjfas-2023-0138","url":null,"abstract":"Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print. <br/> Large lakes, such as Lake Simcoe, Ontario, Canada, are undergoing significant change due to local and global stressors. Uni- and multivariate analyses of Lake Simcoe's zooplankton community from 1986 to 2012 indicated multiple events of ecosystem change that were synchronous across three lake stations. In the mid-1990s, shifts in zooplankton species abundance and richness, and total cladoceran body size were strongly correlated with the invasion of the zooplanktivore, Bythotrephes cederstroemii. In the early 2000s, additional shifts in zooplankton abundance, as well as copepod body size, coincided with increased water clarity (linked to filter feeding by the invader Dreissena polymorpha) and hypolimnetic water temperature. Further community changes occurred in the 2000s when Bythotrephes declined and many vulnerable cladoceran species recovered. However, the Lake Simcoe community did not fully return to its pre-invasion state as the cold-water herbivores, Daphnia longiremis and Daphnia pulicaria, remained absent. The Lake Simcoe zooplankton community illustrates ongoing ecosystem change that propagated throughout the lake food web and may be reflected in other lakes experiencing global stressors of climate change and species invasions.","PeriodicalId":9515,"journal":{"name":"Canadian Journal of Fisheries and Aquatic Sciences","volume":"19 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141063262","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print. Survival through the larval phase is predicated on the probabilities of successful feeding, which dictates growth rates, and the probabilities of encountering predators. Here I perform a synthesis of feeding, growth, and mortality rates estimated during several studies from coastal Newfoundland, Canada, to provide a description of the probability distribution that can serve as a foundation of the expected distribution of vital rates. The standardized observations clearly follow that of skewed distributions, appropriately fit to a probability gamma distribution, with feeding demonstrating a stronger degree of skewness than either mortality or growth, possibly because each vital rate integrates prey–predator interactions over different time scales. Commonality in the underlying form of the distribution of vital rates in larval fish, along with clear functional relationships between gamma parameters, represents a probabilistic basis of expectations against which observations from prior or new studies can be contrasted. An example of the use of such expectations demonstrates that they can provide useful contextual information about the contrast among observations and our ability to identify their relationship with environmental drivers.
{"title":"A probabilistic foundation for the study of larval fish feeding, growth, and mortality rates","authors":"Pierre Pepin","doi":"10.1139/cjfas-2023-0339","DOIUrl":"https://doi.org/10.1139/cjfas-2023-0339","url":null,"abstract":"Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print. <br/> Survival through the larval phase is predicated on the probabilities of successful feeding, which dictates growth rates, and the probabilities of encountering predators. Here I perform a synthesis of feeding, growth, and mortality rates estimated during several studies from coastal Newfoundland, Canada, to provide a description of the probability distribution that can serve as a foundation of the expected distribution of vital rates. The standardized observations clearly follow that of skewed distributions, appropriately fit to a probability gamma distribution, with feeding demonstrating a stronger degree of skewness than either mortality or growth, possibly because each vital rate integrates prey–predator interactions over different time scales. Commonality in the underlying form of the distribution of vital rates in larval fish, along with clear functional relationships between gamma parameters, represents a probabilistic basis of expectations against which observations from prior or new studies can be contrasted. An example of the use of such expectations demonstrates that they can provide useful contextual information about the contrast among observations and our ability to identify their relationship with environmental drivers.","PeriodicalId":9515,"journal":{"name":"Canadian Journal of Fisheries and Aquatic Sciences","volume":"16 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141552432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Elizabeth J. Golebie, Carena J. van Riper, Dana N. Johnson, Kreg Lindberg, North Joffe-Nelson, Seunguk Shin, Richard Stedman, Cory Suski, Len M. Hunt
Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print. Angler decisions are shaped by an interplay between “internal” psychological processes and “external” institutional factors that are equally important yet often evaluated in isolation. We therefore developed a hybrid choice model whereby a structural equation model of behavioral antecedents was integrated with a discrete choice experiment to evaluate competing preferences for fisheries management scenarios across the Great Lakes region. We observed that preferences for native fish populations, invasive species impacts, wash station availability, habitat quality, and added cost per fishing trip were rooted in nature-based (i.e., biospheric), human-focused (i.e., altruistic) and self-driven (i.e., egoistic) values. Specifically, preferences for reduced invasive species impacts were more pronounced among anglers with stronger altruistic values, and less pronounced among those with strong egoistic values. Preferences also varied by fishing mode, in that boaters were more sensitive to cost than shoreline or mixed mode users, and younger anglers were more open to change. This study showcases a novel interdisciplinary methodological approach that builds more complete knowledge of the interrelationships between psychological and institutional factors that underpin angler decision-making.
{"title":"Hybrid choice modeling offers an interdisciplinary perspective on angler preferences for the future","authors":"Elizabeth J. Golebie, Carena J. van Riper, Dana N. Johnson, Kreg Lindberg, North Joffe-Nelson, Seunguk Shin, Richard Stedman, Cory Suski, Len M. Hunt","doi":"10.1139/cjfas-2023-0280","DOIUrl":"https://doi.org/10.1139/cjfas-2023-0280","url":null,"abstract":"Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print. <br/> Angler decisions are shaped by an interplay between “internal” psychological processes and “external” institutional factors that are equally important yet often evaluated in isolation. We therefore developed a hybrid choice model whereby a structural equation model of behavioral antecedents was integrated with a discrete choice experiment to evaluate competing preferences for fisheries management scenarios across the Great Lakes region. We observed that preferences for native fish populations, invasive species impacts, wash station availability, habitat quality, and added cost per fishing trip were rooted in nature-based (i.e., biospheric), human-focused (i.e., altruistic) and self-driven (i.e., egoistic) values. Specifically, preferences for reduced invasive species impacts were more pronounced among anglers with stronger altruistic values, and less pronounced among those with strong egoistic values. Preferences also varied by fishing mode, in that boaters were more sensitive to cost than shoreline or mixed mode users, and younger anglers were more open to change. This study showcases a novel interdisciplinary methodological approach that builds more complete knowledge of the interrelationships between psychological and institutional factors that underpin angler decision-making.","PeriodicalId":9515,"journal":{"name":"Canadian Journal of Fisheries and Aquatic Sciences","volume":"54 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142194888","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Erin K. Gilligan-Lunda, Adam Duarte, James T. Peterson
Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print. Sturgeons are among the most endangered fishes in the world. Identifying habitat use characteristics to inform restoration projects is crucial for recovery. However, small sample sizes, inadequate replication of studies, and limited spatial extents complicate our ability to effectively apply the findings of single studies to endangered species conservation across the larger riverscape. We synthesized information from amphidromous and anadromous sturgeons in North America to identify species-specific knowledge gaps and conduct a quantitative comparison of species–habitat relationships. We provided a qualitative summary of substrate use and synthesized estimates of depth and velocity during spawning and non-spawning activity. Generalized patterns among species were identified, such as spawning in fast water on hard substrate and then using slow water with soft substrate areas when not spawning. We noted species-specific variability during spawning that may be attributed to historical maximum length, egg characteristics, and watershed features. This study provides some of the first estimates of habitat use that can be adapted for many populations. Results can contribute to empirically grounded decision-support tools used to prioritize information needs for recovery.
{"title":"Habitat use of anadromous and amphidromous sturgeons in North America: a systematic review","authors":"Erin K. Gilligan-Lunda, Adam Duarte, James T. Peterson","doi":"10.1139/cjfas-2023-0222","DOIUrl":"https://doi.org/10.1139/cjfas-2023-0222","url":null,"abstract":"Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print. <br/> Sturgeons are among the most endangered fishes in the world. Identifying habitat use characteristics to inform restoration projects is crucial for recovery. However, small sample sizes, inadequate replication of studies, and limited spatial extents complicate our ability to effectively apply the findings of single studies to endangered species conservation across the larger riverscape. We synthesized information from amphidromous and anadromous sturgeons in North America to identify species-specific knowledge gaps and conduct a quantitative comparison of species–habitat relationships. We provided a qualitative summary of substrate use and synthesized estimates of depth and velocity during spawning and non-spawning activity. Generalized patterns among species were identified, such as spawning in fast water on hard substrate and then using slow water with soft substrate areas when not spawning. We noted species-specific variability during spawning that may be attributed to historical maximum length, egg characteristics, and watershed features. This study provides some of the first estimates of habitat use that can be adapted for many populations. Results can contribute to empirically grounded decision-support tools used to prioritize information needs for recovery.","PeriodicalId":9515,"journal":{"name":"Canadian Journal of Fisheries and Aquatic Sciences","volume":"1 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140613096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Kaeli A. Davenport, Ronald G. Twibell, Matthew S. Piteo, Douglas P. Peterson, William P. Baker, Ryan K. Simmons, Andrew R. Whiteley
Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print. Evaluating the efficacy of the use of Trojan male brook trout with two Y chromosomes (MYY) requires a better understanding of reproductive performance. We measured the reproductive performance of hatchery age-0 and age-1 MYY brook trout compared to hatchery XY males using laboratory crosses. Offspring of XY males had higher survival than offspring of age-1 MYY 1-day post-fertilization, but not offspring of age-0 MYY. We found no detectable differences in survival from eyed-egg to the juvenile-fry stage. However, size-at-age differed, where offspring of age-0 MYY were 3.6% smaller in length and 25.2% smaller in weight than those of XY males. For crosses fertilized by both MYY and XY males, we found that a significantly higher proportion of offspring within families were sired by MYY versus XY males. These results show, under controlled conditions, evidence for possible fitness advantage for MYY under sperm competition, but a possible fitness disadvantage associated with early growth of their offspring. Overall, our results hold promise for the use of MYY brook trout to serve as an effective eradication tool.
加拿大渔业与水产科学杂志》（Canadian Journal of Fisheries and Aquatic Sciences），提前出版。 评估使用带有两条Y染色体的特洛伊雄性鳟鱼（MYY）的效果需要更好地了解其繁殖性能。我们利用实验室杂交方法测量了孵化的0龄和1龄MYY鳟鱼与孵化的XY雄性鳟鱼的繁殖性能比较。XY雄鱼的后代在受精后1天的存活率比1龄MYY的后代要高，但0龄MYY的后代则没有。我们没有发现从卵到幼鱼阶段的存活率有任何差异。但是，年龄大小却有差异，0龄 MYY 的后代比 XY 雄性的后代体长小 3.6%，体重小 25.2%。对于由 MYY 雄性和 XYY 雄性受精的杂交，我们发现，由 MYY 雄性和 XYY 雄性受精的家系后代比例显著高于由 XYY 雄性受精的家系后代比例。这些结果表明，在受控条件下，有证据表明 MYY 在精子竞争中可能具有适应性优势，但其后代的早期生长可能会导致适应性劣势。总之，我们的研究结果为利用 MYY 锦鳟鱼作为有效的根除工具带来了希望。
{"title":"Lab-based evaluation of the reproductive performance of Trojan (MYY) brook trout (Salvelinus fontinalis)","authors":"Kaeli A. Davenport, Ronald G. Twibell, Matthew S. Piteo, Douglas P. Peterson, William P. Baker, Ryan K. Simmons, Andrew R. Whiteley","doi":"10.1139/cjfas-2023-0245","DOIUrl":"https://doi.org/10.1139/cjfas-2023-0245","url":null,"abstract":"Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print. <br/> Evaluating the efficacy of the use of Trojan male brook trout with two Y chromosomes (MYY) requires a better understanding of reproductive performance. We measured the reproductive performance of hatchery age-0 and age-1 MYY brook trout compared to hatchery XY males using laboratory crosses. Offspring of XY males had higher survival than offspring of age-1 MYY 1-day post-fertilization, but not offspring of age-0 MYY. We found no detectable differences in survival from eyed-egg to the juvenile-fry stage. However, size-at-age differed, where offspring of age-0 MYY were 3.6% smaller in length and 25.2% smaller in weight than those of XY males. For crosses fertilized by both MYY and XY males, we found that a significantly higher proportion of offspring within families were sired by MYY versus XY males. These results show, under controlled conditions, evidence for possible fitness advantage for MYY under sperm competition, but a possible fitness disadvantage associated with early growth of their offspring. Overall, our results hold promise for the use of MYY brook trout to serve as an effective eradication tool.","PeriodicalId":9515,"journal":{"name":"Canadian Journal of Fisheries and Aquatic Sciences","volume":"52 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140590539","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Daniel P. Struthers, Lee F.G. Gutowsky, Tim C.D. Lucas, Neil J. Mochnacz, Christopher M. Carli, Mark K. Taylor
Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print. Statistical stream temperature models predicting the fine-scale spatial distribution of water temperatures (i.e., “thermalscape”) can guide aquatic species recovery and habitat restoration efforts. However, stream temperature modelling is complicated by spatial autocorrelation arising from non-independence of sampling sites within dendritic networks. We used August mean temperature data from miniature sensors deployed in Canadian Rocky Mountain streams to demonstrate two statistical stream temperature modelling techniques that account for spatial autocorrelation. The first was a spatial steam network (SSN) model specifically developed to account for spatial autocorrelation in dendritic stream networks. The second was an integrated nested Laplace approximation (INLA) model that accounts for spatial autocorrelation but was not designed to address anisotropic stream network data. We evaluated the best-fitting SSN and INLA models using leave-one-out cross-validation. Relative to INLA, SSN models had lower RMSE (1.23 vs. 1.45 C) and higher r2 (0.71 vs. 0.61); however, the SSN models required more preprocessing steps before incorporating spatially correlated random errors. We provide practical advice, an open-access r-script, and data to help non-experts develop statistical stream temperature models.
{"title":"Statistical stream temperature modelling with SSN and INLA: an introduction for conservation practitioners","authors":"Daniel P. Struthers, Lee F.G. Gutowsky, Tim C.D. Lucas, Neil J. Mochnacz, Christopher M. Carli, Mark K. Taylor","doi":"10.1139/cjfas-2023-0136","DOIUrl":"https://doi.org/10.1139/cjfas-2023-0136","url":null,"abstract":"Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print. <br/> Statistical stream temperature models predicting the fine-scale spatial distribution of water temperatures (i.e., “thermalscape”) can guide aquatic species recovery and habitat restoration efforts. However, stream temperature modelling is complicated by spatial autocorrelation arising from non-independence of sampling sites within dendritic networks. We used August mean temperature data from miniature sensors deployed in Canadian Rocky Mountain streams to demonstrate two statistical stream temperature modelling techniques that account for spatial autocorrelation. The first was a spatial steam network (SSN) model specifically developed to account for spatial autocorrelation in dendritic stream networks. The second was an integrated nested Laplace approximation (INLA) model that accounts for spatial autocorrelation but was not designed to address anisotropic stream network data. We evaluated the best-fitting SSN and INLA models using leave-one-out cross-validation. Relative to INLA, SSN models had lower RMSE (1.23 vs. 1.45 C) and higher r2 (0.71 vs. 0.61); however, the SSN models required more preprocessing steps before incorporating spatially correlated random errors. We provide practical advice, an open-access r-script, and data to help non-experts develop statistical stream temperature models.","PeriodicalId":9515,"journal":{"name":"Canadian Journal of Fisheries and Aquatic Sciences","volume":"11 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140070048","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print. Machine learning occupies a central position in the modeling of fish distribution patterns. The augmentation of explanatory variables in fish habitat through many kinds of observational methodologies necessitates the discernment of an optimal combination of these variables for fish distribution modeling. We proposed a feature selection technique, recursive feature elimination with cross-validation (RFECV), to determine optimal variables combinations for yellowfin tuna distribution in the Pacific Ocean. Four tree-based models, random forest, eXtreme Gradient Boosting, Light Gradient Boosting Machine, and categorical boosting driven by RFECV, were developed using comprehensive fisheries and biotic/abiotic data. Habitat variables including sea temperature, dissolved oxygen concentration, chlorophyll-a concentration, sea salinity, and sea surface height were identified as significant features by all models. The models were trained using the corresponding selected variables, and these trained models were employed to predict the spatiotemporal distribution of yellowfin tuna from 1995 to 2019. The results obtained could inform useful knowledge for the sustainable exploitation of yellowfin tuna in the Pacific Ocean and furnish a benchmark of feature selection for machine-learning-based distribution modeling of other pelagic species.
{"title":"Identifying optimal variables for machine-learning-based fish distribution modeling","authors":"Shaohua Xu, Jintao Wang, Xinjun Chen, Jiangfeng Zhu","doi":"10.1139/cjfas-2023-0197","DOIUrl":"https://doi.org/10.1139/cjfas-2023-0197","url":null,"abstract":"Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print. <br/> Machine learning occupies a central position in the modeling of fish distribution patterns. The augmentation of explanatory variables in fish habitat through many kinds of observational methodologies necessitates the discernment of an optimal combination of these variables for fish distribution modeling. We proposed a feature selection technique, recursive feature elimination with cross-validation (RFECV), to determine optimal variables combinations for yellowfin tuna distribution in the Pacific Ocean. Four tree-based models, random forest, eXtreme Gradient Boosting, Light Gradient Boosting Machine, and categorical boosting driven by RFECV, were developed using comprehensive fisheries and biotic/abiotic data. Habitat variables including sea temperature, dissolved oxygen concentration, chlorophyll-a concentration, sea salinity, and sea surface height were identified as significant features by all models. The models were trained using the corresponding selected variables, and these trained models were employed to predict the spatiotemporal distribution of yellowfin tuna from 1995 to 2019. The results obtained could inform useful knowledge for the sustainable exploitation of yellowfin tuna in the Pacific Ocean and furnish a benchmark of feature selection for machine-learning-based distribution modeling of other pelagic species.","PeriodicalId":9515,"journal":{"name":"Canadian Journal of Fisheries and Aquatic Sciences","volume":"73 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141188582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print. The pelagic food webs of British Columbia’s (BC) coastal oceans have never had a comprehensive review of their trophic structure. In this study, we analyzed carbon (δ13C) and nitrogen (δ15N) stable isotope ratios of pelagic food web components collected from four regions in southern BC: Juan de Fuca Strait, the Strait of Georgia, Queen Charlotte Strait, and Queen Charlotte Sound during an August 2019 survey. In addition, conductivity, temperature, and depth (CTD), chlorophyll, and nutrient data were collected to assess the oceanographic basis for regionalization. Between regions, we observed differences in the isotopic baseline driven by regional oceanography. Likewise, we also observed oceanography-driven differences in regional food chain length, carbon range, and isotopic overlap. Species-specific trophic level and isotopic niche were determined. For common pelagic species, we described how trophic level varied regionally, was not always in line with previously published dietary data, and instead largely tracked regional changes in food chain length. We conclude that variable food web properties and trophic ecology can manifest across the small spatial scales of the BC coast’s discrete regions.
加拿大渔业与水产科学杂志》（Canadian Journal of Fisheries and Aquatic Sciences），提前印刷。 不列颠哥伦比亚省（BC）沿海海洋的中上层食物网从未对其营养结构进行过全面研究。在这项研究中，我们分析了从不列颠哥伦比亚省南部四个地区采集的浮游食物网组成部分的碳（δ13C）和氮（δ15N）稳定同位素比率：在 2019 年 8 月的一次调查中，从不列颠哥伦比亚省南部的胡安德富卡海峡、乔治亚海峡、夏洛特女王海峡和夏洛特女王湾采集了浮游食物网成分的碳（δ13C）和氮（δ15N）稳定同位素比率。此外，还收集了电导率、温度和深度（CTD）、叶绿素和营养物质数据，以评估区域化的海洋学基础。在不同区域之间，我们观察到受区域海洋学影响的同位素基线存在差异。同样，我们还观察到区域食物链长度、碳范围和同位素重叠方面的海洋学差异。我们确定了物种的特定营养级和同位素生态位。对于常见的中上层物种，我们描述了营养级的区域性变化，这种变化并不总是与之前公布的膳食数据一致，而是在很大程度上跟踪了食物链长度的区域性变化。我们的结论是，在不列颠哥伦比亚省海岸离散区域的较小空间尺度上，食物网特性和营养生态的变化是显而易见的。
{"title":"Stable isotopes delineate regional pelagic food web structure in British Columbia’s coastal ocean","authors":"Jacob E. Lerner, Brian P. V. Hunt","doi":"10.1139/cjfas-2023-0057","DOIUrl":"https://doi.org/10.1139/cjfas-2023-0057","url":null,"abstract":"Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print. <br/> The pelagic food webs of British Columbia’s (BC) coastal oceans have never had a comprehensive review of their trophic structure. In this study, we analyzed carbon (δ13C) and nitrogen (δ15N) stable isotope ratios of pelagic food web components collected from four regions in southern BC: Juan de Fuca Strait, the Strait of Georgia, Queen Charlotte Strait, and Queen Charlotte Sound during an August 2019 survey. In addition, conductivity, temperature, and depth (CTD), chlorophyll, and nutrient data were collected to assess the oceanographic basis for regionalization. Between regions, we observed differences in the isotopic baseline driven by regional oceanography. Likewise, we also observed oceanography-driven differences in regional food chain length, carbon range, and isotopic overlap. Species-specific trophic level and isotopic niche were determined. For common pelagic species, we described how trophic level varied regionally, was not always in line with previously published dietary data, and instead largely tracked regional changes in food chain length. We conclude that variable food web properties and trophic ecology can manifest across the small spatial scales of the BC coast’s discrete regions.","PeriodicalId":9515,"journal":{"name":"Canadian Journal of Fisheries and Aquatic Sciences","volume":"27 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140003537","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print.
加拿大渔业和水产科学杂志》，提前印刷。
{"title":"Comment: “Forestry influences on salmonid habitat in the North Thompson River watershed, British Columbia”","authors":"R.D. (Dan) Moore","doi":"10.1139/cjfas-2023-0259","DOIUrl":"https://doi.org/10.1139/cjfas-2023-0259","url":null,"abstract":"Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print. <br/>","PeriodicalId":9515,"journal":{"name":"Canadian Journal of Fisheries and Aquatic Sciences","volume":"36 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139951456","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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