Journal of Fish and Wildlife Management最新文献_第2页

Evaluation of age estimates and resulting population metrics using four aging methods from a Midwestern Blue Catfish population 使用四种老化方法评估中西部蓝鲶鱼种群的年龄估计值和由此产生的种群指标

IF 0.7 4区环境科学与生态学

Journal of Fish and Wildlife Management Pub Date : 2024-06-06 DOI: 10.3996/jfwm-23-042

Ernesto Flores, J. Koch, Ben C. Neely

{"title":"Evaluation of age estimates and resulting population metrics using four aging methods from a Midwestern Blue Catfish population","authors":"Ernesto Flores, J. Koch, Ben C. Neely","doi":"10.3996/jfwm-23-042","DOIUrl":"https://doi.org/10.3996/jfwm-23-042","url":null,"abstract":"\u0000 Lapillus otoliths and several preparations of pectoral fin spines have been used to age Blue Catfish Ictalurus furcatus; however, there are limited studies examining relative precision of age estimates. Further, comparisons of population characteristics (e.g., growth, mortality) resulting from age structure evaluations are needed to help fisheries managers balance resources needed to conduct investigations with quality of subsequent data. We examined sectioned Blue Catfish lapillus otoliths and sectioned pectoral spine articulating processes, basal recesses, and articulating surfaces to compare relative precision of age estimates. Additionally, dynamic rate functions and resulting population models were examined to determine if variation in age estimates resulted in divergent interpretation of population characteristics. Generally, aging precision was greatest for articulating surface and lapillus otolith sections. Although growth models generated from each aging structured differed, mortality estimates and conclusions drawn from harvest-regulated population modeling were similar across structures. These results demonstrate that although there is variability in precision and growth modeling among different Blue Catfish aging structures, estimates for key population parameters remain consistent.","PeriodicalId":49036,"journal":{"name":"Journal of Fish and Wildlife Management","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141380675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Use of environmental DNA for early detection of invasive Elodea species in interior Alaska 利用环境 DNA 早期检测阿拉斯加内陆地区的入侵艾叶物种

IF 0.7 4区环境科学与生态学

Journal of Fish and Wildlife Management Pub Date : 2024-06-06 DOI: 10.3996/jfwm-23-047

Anna‐Marie Benson, O. Russ, Jonah L. Withers, J. Olsen, James L. Fox, Richard F. Lance, Xin-yang Guan, J. Wenburg

{"title":"Use of environmental DNA for early detection of invasive Elodea species in interior Alaska","authors":"Anna‐Marie Benson, O. Russ, Jonah L. Withers, J. Olsen, James L. Fox, Richard F. Lance, Xin-yang Guan, J. Wenburg","doi":"10.3996/jfwm-23-047","DOIUrl":"https://doi.org/10.3996/jfwm-23-047","url":null,"abstract":"\u0000 Invasive Canadian waterweed Elodea canadensis and western waterweed E. nuttallii are a threat to native salmon Onchorhynchus spp. in Alaska. Early detection is important to stop or mitigate spread. We evaluated detection of environmental DNA (eDNA) as a tool for early detection of these invasive species in Alaska. First, we evaluated four quantitative real-time PCR assays, one for each species, and two targeting either species, using samples taken at known infestations in Chena Lakes and Potter Marsh, Alaska. We also deployed E. nuttallii in screened containers at the Small Arms Complex Pond, Fort Wainwright, Alaska (Test Pond) in 2018 and 2019 to evaluate the detection of eDNA as a function of distance from the containers. At the known infestations, we detected the eDNA of both species in water samples. However, in our Test Pond, we only detected Elodea eDNA in 2 of 126 samples collected in 2019. Both detections were from samples collected within 10 cm of the containers. There were no detections in 60 samples collected in 2018 at the Test Pond. While there are potential uses for the eDNA markers we developed (e.g., species identification), we found no evidence to support their use as an early detection tool for Elodea in Alaska.","PeriodicalId":49036,"journal":{"name":"Journal of Fish and Wildlife Management","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141376930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Limited success of radio frequency identification technology in locating nests of a crevice-nesting seabird, the ashy storm-petrel 射频识别技术在确定缝隙筑巢海鸟灰海燕的巢穴位置方面成效有限

IF 0.7 4区环境科学与生态学

Journal of Fish and Wildlife Management Pub Date : 2024-06-06 DOI: 10.3996/jfwm-24-010

Amy Yanagitsuru, Chris Tyson, Pete Warzybok, Amanda Spears, Sean Gee, Elisha Hull

{"title":"Limited success of radio frequency identification technology in locating nests of a crevice-nesting seabird, the ashy storm-petrel","authors":"Amy Yanagitsuru, Chris Tyson, Pete Warzybok, Amanda Spears, Sean Gee, Elisha Hull","doi":"10.3996/jfwm-24-010","DOIUrl":"https://doi.org/10.3996/jfwm-24-010","url":null,"abstract":"\u0000 Locating the breeding or refuge sites of burrowing or crevice-dwelling animals is a difficult undertaking, particularly for cryptic and secretive species. Here, we summarize our efforts to use Radio Frequency Identification (RFID) technology to locate nesting sites of ashy storm-petrels Hydrobates homochroa on Southeast Farallon Island, Farallon Islands National Wildlife Refuge, California, USA. We deployed a total of 799 RFID tags on storm-petrels captured in mist nets across three breeding seasons from 2017 to 2019. We then attempted to relocate tagged birds in suitable nesting habitat across the island. We employed both passive and active searching strategies over the course of three different breeding seasons and had the most success finding storm-petrel nests using passive searching with stationary RFID readers, although detection rates were low. We found probable nests for an average of 3.1% of tagged individuals with stationary readers and no individuals with an active search method. We suggest that while stationary RFID readers were more successful than active methods, we cannot recommend the method for locating nesting storm-petrels because of the labor involved and low success rate.","PeriodicalId":49036,"journal":{"name":"Journal of Fish and Wildlife Management","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141376362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessing Injury Rates to Red-tailed Hawks Live- captured Using Three Common Methods 用三种常用方法评估现场捕获的红尾鹰的受伤率

IF 0.7 4区环境科学与生态学

Journal of Fish and Wildlife Management Pub Date : 2024-06-06 DOI: 10.3996/jfwm-23-050

Brian E. Washburn, N. Mateus-Pinilla, Scott F. Beckerman, Adam W. Stern, Anthony M. Hoffman, Craig K. Pullins, Melanie M. Bergman, Federico R. Vilaplana Grosso

{"title":"Assessing Injury Rates to Red-tailed Hawks Live- captured Using Three Common Methods","authors":"Brian E. Washburn, N. Mateus-Pinilla, Scott F. Beckerman, Adam W. Stern, Anthony M. Hoffman, Craig K. Pullins, Melanie M. Bergman, Federico R. Vilaplana Grosso","doi":"10.3996/jfwm-23-050","DOIUrl":"https://doi.org/10.3996/jfwm-23-050","url":null,"abstract":"\u0000 Assessments of the impact of live-capture methods and tools are important to wildlife research and management efforts. Federal regulations (e.g., the Migratory Bird Treaty Act and the Animal Welfare Act) require humane and ethical treatment of migratory birds. Therefore, it is important to conduct live-trapping using methodologies that minimize the potential for injury or mortality. We evaluated the injury rate experienced by red-tailed hawks Buteo jamaicensis captured using three, commonly-used live-traps (i.e., bal-chatri trap, Swedish goshawk trap, and pole trap). Professional wildlife biologists at airports in Illinois live-captured 25 free-ranging red-tailed hawks using bal-chatri traps, 42 red-tailed hawks using Swedish goshawk traps, and 25 red-tailed hawks using pole traps. Of the red-tailed hawks (n = 53) identified by a veterinary forensic pathologist as having one or more capture-related injuries, 85% of the injuries were classified as ‘minor’ (e.g., cuts or scrapes), 13% were classified as ‘moderate’ (e.g., hemorrhaging), and only 2% were classified as ‘severe’ (e.g., fractures). When considering only injuries classified as ‘moderate’ and ‘severe’, we found no difference (χ21 = 0.38, P = 0.54) in the frequency of these injuries among the three trap types. The three live-trap devices we evaluated can be efficient tools that result in minimal risk of injury or death when used by those with proper training and experience to live-capture red-tailed hawks for research purposes, while conducting raptor hazard management activities, or licensed falconers acquiring wild red-tailed hawks.","PeriodicalId":49036,"journal":{"name":"Journal of Fish and Wildlife Management","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141379880","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Temporal changes in geographic range and population size of the Santa Cruz Black Salamander 圣克鲁斯黑蝾螈地理范围和种群数量的时间变化

IF 0.7 4区环境科学与生态学

Journal of Fish and Wildlife Management Pub Date : 2024-06-04 DOI: 10.3996/jfwm-23-004

Brandon R. Kong, Ammon Corl, Sean B. Reilly

{"title":"Temporal changes in geographic range and population size of the Santa Cruz Black Salamander","authors":"Brandon R. Kong, Ammon Corl, Sean B. Reilly","doi":"10.3996/jfwm-23-004","DOIUrl":"https://doi.org/10.3996/jfwm-23-004","url":null,"abstract":"\u0000 The Santa Cruz Black Salamander Aneides niger is a priority 3 California species of special concern with a restricted geographic range confined to the Santa Cruz Mountains. Anecdotal observations suggest that the species was relatively abundant in the early 1900’s, but it has become more difficult to find in the past few decades. To better understand if the species has undergone population size fluctuations, we analyzed mitochondrial and nuclear sequence data to examine levels of genetic variation, phylogeographic structure, and test for signatures of population size change. We then reconstructed the climatic suitability for the species to A) determine if past climate fluctuations could have influenced range size and genetic diversity, and B) to estimate the effects of future climate change on geographic range suitability as a proxy for possible future population size change. Genetic analyses detected low levels of genetic variation and a general lack of genetic structuring, suggesting a recent genetic bottleneck. While neutrality tests of individual loci were non-significant, skyline plot and isolation-with-migration analyses detected a relatively recent reduction in population size. These genetic results should be interpreted with consideration of the limited number of localities and individuals that have been sampled for this species. Climatic suitability for Santa Cruz Black Salamanders was much lower during the last glacial maximum, which could be the cause of the detected historical change in population size. Future projections of climatic suitability under a high emission scenario suggest a dramatic geographic range restriction to coastal areas. These projections highlight the need for the protection of coastal habitat patches to preserve existing coastal populations, and to maintain connectivity between coastal and inland habitats to allow the westward movement of populations and genes in response to climate change.","PeriodicalId":49036,"journal":{"name":"Journal of Fish and Wildlife Management","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141267247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Use of Fin Rays and Fin Spines in Nonlethal Age Estimation of Florida Bass 利用鳍条和鳍刺估算佛罗里达鲈鱼的非致死年龄

IF 0.7 4区环境科学与生态学

Journal of Fish and Wildlife Management Pub Date : 2024-06-03 DOI: 10.3996/jfwm-22-067

Summer Lindelien, Daryl C. Parkyn, Chris C. Anderson, Jason H. O’Connor, A. Dutterer, P. Schueller

{"title":"Use of Fin Rays and Fin Spines in Nonlethal Age Estimation of Florida Bass","authors":"Summer Lindelien, Daryl C. Parkyn, Chris C. Anderson, Jason H. O’Connor, A. Dutterer, P. Schueller","doi":"10.3996/jfwm-22-067","DOIUrl":"https://doi.org/10.3996/jfwm-22-067","url":null,"abstract":"\u0000 Nonlethal age-estimation methods for Florida Bass Micropterus salmoides using fin rays and spines would enhance trophy-bass research, management, and conservation. Nonlethal removal of fin structures would also expand opportunities for collecting age-related information, specifically during small-population projects as well as tournaments and citizen-science programs, for which sacrificing fish is not an option. We assessed the bias of age estimates derived from Florida Bass anal-, pelvic-, dorsal-, and pectoral-fin rays and anal-, pelvic-, and dorsal-fin spines by comparing them to age estimates derived from otoliths (i.e., sagittae), which are the standard for ageing Florida Bass. We evaluated the precision of age estimates by calculating the absolute difference between replicate reads of each ageing structure for each reader. Linear-mixed effects model selection indicated that precision was most affected by age, structure, and the age*structure interaction, in which the effect of age varied by structure. Age estimates from otoliths were the most precise whereas pelvic spines were the least precise among all structures examined. Bias was similar across all fin structures, but the effect of age on bias varied by reader. Marginal increment analysis indicated that annulus formation was completed from November to March in Florida Bass dorsal spines, 5 months earlier than in Florida Bass otoliths. Our results suggest that nonlethally removed fin structures, especially dorsal spines, have potential for use in estimating age, growth rates, mortality, and age structure of bass populations, which could be particularly beneficial where bass can reach unusual trophy sizes.","PeriodicalId":49036,"journal":{"name":"Journal of Fish and Wildlife Management","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141268866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental Evaluation Of A Modular Electric Barrier For The Deterrence Of Invasive Carp 用于阻止入侵鲤鱼的模块化电屏障的实验评估

IF 0.7 4区环境科学与生态学

Journal of Fish and Wildlife Management Pub Date : 2024-06-03 DOI: 10.3996/jfwm-22-063

Scott F. Collins, A. Porreca, M. Nannini, S. E. Butler, Kyle J. Broadway, Joseph J. Parkos, David H. Wahl

{"title":"Experimental Evaluation Of A Modular Electric Barrier For The Deterrence Of Invasive Carp","authors":"Scott F. Collins, A. Porreca, M. Nannini, S. E. Butler, Kyle J. Broadway, Joseph J. Parkos, David H. Wahl","doi":"10.3996/jfwm-22-063","DOIUrl":"https://doi.org/10.3996/jfwm-22-063","url":null,"abstract":"\u0000 We conducted a series of studies to assess the effectiveness of an electric barrier in deterring the movements of freshwater fish. Fish responses (detections⋅individual−1⋅hr−1 within the 3 m exclusion zone) were quantified for a mixed assemblage of native and non-native fishes within 0.4 ha ponds. Additionally, we mapped the surface voltages generated by the electric barrier in a nearby stream. The electric barrier (operated at 10 kW) was effective at deterring native and invasive fishes, as > 99% of all fish detections within the exclusion zone occurred while the electric barrier was off. However, some fish detections occurred while the system was operated at full power, indicating the electric barrier was not 100% effective. A follow-up study found that fish responses differed between low (3.6 kW), medium (6.6 kW), and high (10 kW) field strengths, with Smallmouth Buffalo Ictiobus bubalus exhibiting a greater sensitivity to the low setting than Bighead Carp Hypophthalmichthys nobilis and Silver Carp H. molitrix. Maps of the surface voltages within a nearby stream indicated that the electric barrier was strong enough to deter Silver Carp (> 1 V/cm). However, the surface voltages quickly dissipated upstream and downstream of the electrodes. Overall, the electric barrier appears to be an effective tool that can be used to combat the spread of invasive fishes in freshwater environments. However, more evaluations are needed to test how the system performs in different conditions and to identify whether fish of varying sizes or life stages respond similarly.","PeriodicalId":49036,"journal":{"name":"Journal of Fish and Wildlife Management","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141270927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Predator presence influences survival and behavior of translocated stream fish in ponds 捕食者的存在影响池塘中被转移的溪流鱼类的生存和行为

IF 0.7 4区环境科学与生态学

Journal of Fish and Wildlife Management Pub Date : 2024-06-03 DOI: 10.3996/jfwm-22-069

Peter J. Pfaff, K. J. Hase, K. Gido

{"title":"Predator presence influences survival and behavior of translocated stream fish in ponds","authors":"Peter J. Pfaff, K. J. Hase, K. Gido","doi":"10.3996/jfwm-22-069","DOIUrl":"https://doi.org/10.3996/jfwm-22-069","url":null,"abstract":"\u0000 Small artificial impoundments such as farm ponds have recently been recognized as potential habitat for threatened native fish species. However, factors influencing translocation or colonization success into these environments, including connectivity to stream networks and interactions with existing fish community, are largely unknown. In this study we conducted a controlled experiment to quantify the influence of piscivorous Largemouth Bass Micropterus salmoides on the survival of a translocated native minnow species that we used as a surrogate for federally endangered Topeka Shiner Notropis topeka. We translocated or released 100 Bluntnose Minnow Pimephales notatus into each replicate treatment ponds with and without Largemouth Bass in the summers of 2020 and 2021. Each minnow was implanted with a passive integrated transponder (PIT) tag. Translocated populations were monitored using stationary and mobile passive integrated transponder antennas and estimates of apparent survival and probability of detection for each pond were derived from open population mark-recapture models. Apparent survival was nearly two times higher in ponds without bass suggesting predation by bass leads to higher mortality. Additionally, probability of detection was nearly 10 times higher in ponds without bass, suggesting reduced movement of translocated minnows when bass were present. While the direct effect of mortality impacts translocated populations, the indirect effect of altered behavior may also be impactful on translocation success. These results confirm that Largemouth Bass can limit the success of translocated minnow species.","PeriodicalId":49036,"journal":{"name":"Journal of Fish and Wildlife Management","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141268652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of herbivory on the nutritional value of six hardwood species for white-tailed deer in the Allegheny Forest 食草动物对阿勒格尼森林中六种硬木物种对白尾鹿营养价值的影响

IF 0.7 4区环境科学与生态学

Journal of Fish and Wildlife Management Pub Date : 2024-06-01 DOI: 10.3996/jfwm-23-031

L. M. Glover, Sabrina N. Volponi, Alejandro A. Royo, Tamara L. Johnstone-Yellin

{"title":"Effect of herbivory on the nutritional value of six hardwood species for white-tailed deer in the Allegheny Forest","authors":"L. M. Glover, Sabrina N. Volponi, Alejandro A. Royo, Tamara L. Johnstone-Yellin","doi":"10.3996/jfwm-23-031","DOIUrl":"https://doi.org/10.3996/jfwm-23-031","url":null,"abstract":"\u0000 Herbivores alter plant quantity and quality through direct tissue consumption and indirectly via the structural and chemical allocational strategies plants deploy in response to herbivory. Here we examine how browsing by white-tailed deer Odocoileus virginianus alters nutritional quality of six regenerating hardwood species (red maple Acer rubrum, black cherry Prunus serotina, birch Betula spp., pin cherry Prunus pennsylvanica, white ash Fraxinus americana, and American beech Fagus grandifolia). Using an established, large-scale experiment that manipulated deer access to plots using fencing, we tested whether browsing altered the nutritional quality and biomass as well as nutritional capacity to support deer of six hardwood species in an early successional hardwood forest of Pennsylvania, United States. Pin cherry was the most nutritious of the six species with greater dry matter digestibility and digestible protein and lesser neutral detergent fiber. Areas exposed to browsing had less browse biomass of stems and leaves yet greater digestible protein; an effect driven by digestible protein of pin cherry. We found no effect of browsing on neutral detergent fiber or dry matter digestibility. Although deer browsing reduced biomass of the six hardwood species, it did not alter the nutritional capacity to support lactating females in the summer. Our results confirm that browsing limits tree regeneration and available browse and provide conservative conclusions on how deer can alter their diet quality.","PeriodicalId":49036,"journal":{"name":"Journal of Fish and Wildlife Management","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141235049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Relationship between Steelhead Parr Densities Observed during Snorkel Surveys and Emigration Estimates from Rotary Screw Traps 浮潜调查观测到的钢鳟鱼稚鱼密度与旋转式螺旋诱捕器估计的迁出量之间的关系

IF 0.7 4区环境科学与生态学

Journal of Fish and Wildlife Management Pub Date : 2024-06-01 DOI: 10.3996/jfwm-23-019

Joshua R. Poole, Timothy Copeland

{"title":"Relationship between Steelhead Parr Densities Observed during Snorkel Surveys and Emigration Estimates from Rotary Screw Traps","authors":"Joshua R. Poole, Timothy Copeland","doi":"10.3996/jfwm-23-019","DOIUrl":"https://doi.org/10.3996/jfwm-23-019","url":null,"abstract":"\u0000 Snorkel surveys are widely used for monitoring fish populations because they are a versatile and cost-effective technique. However, snorkel surveys are useful to provide instantaneous measurements that might not describe continuous processes, such as the emigration of juvenile anadromous salmonids. A model capable of assessing the level of potential production of emigrating juvenile steelhead (anadromous Oncorhynchus mykiss) from watersheds in Idaho based on snorkel surveys would be useful. Our objective was to determine the relationship between abundance of emigrants estimated from rotary screw traps and parr densities from snorkel surveys. Over 1,000 snorkel surveys and 70 year-watershed combinations of emigrant estimates were analyzed. Density was positively related to emigrant abundance. The most reasonable model included a common slope among watersheds, a common year effect, and varying intercepts, supporting a hypothesis that some watersheds are more productive even at similar densities. This model explained 82.7% of the variation observed in emigrant abundance. Uncertainty was greater among watersheds than within a watershed. The model can be used to translate mean densities observed in snorkel surveys to abundance of steelhead emigrants and thus to infer the effects of a habitat restoration program or other management actions. This work is important as a step towards understanding juvenile emigrant abundance in watersheds without rotary screw traps and to aid understanding of steelhead emigrant productivity in Idaho watersheds.","PeriodicalId":49036,"journal":{"name":"Journal of Fish and Wildlife Management","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141233940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0