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  1. AU="Jacobson, Bailey"
  2. AU="Johnson, Andrew J"
  3. AU="Yu Deng"
  4. AU="Ruelle, Yannick"
  5. AU="Jacobs, Jonathan L"
  6. AU="Massmann, Amanda K"
  7. AU="Shah, Rohan R"
  8. AU="Coppin, Peter"
  9. AU="Kun, Lyubomyra"
  10. AU="Grauvogel, Tanja Daniela"
  11. AU="Serafim, Ricardo A M"
  12. AU="Urzainqui, Ana"
  13. AU="Navarro, Elisa"
  14. AU="Ibrahim, Tawheeda"
  15. AU="Sonntag, William E"
  16. AU="Tamagawa, Masumi"
  17. AU="Subhan, Fazli"
  18. AU="Parisi, A"
  19. AU="Calisher, C H"
  20. AU="Altaş, İrem"

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  1. Artikel: The impact of the COVID-19 pandemic on a recreational rainbow trout (

    Bunt, Christopher M / Jacobson, Bailey

    Environmental biology of fishes

    2022  Band 105, Heft 4, Seite(n) 499–507

    Abstract: There has been a recent flurry of publications describing the potential effects of the COVID-19 pandemic on both commercial and recreational fisheries. As of yet, studies have only provided insights from researchers or industry experts detailing ... ...

    Abstract There has been a recent flurry of publications describing the potential effects of the COVID-19 pandemic on both commercial and recreational fisheries. As of yet, studies have only provided insights from researchers or industry experts detailing perceived consequences, or from survey data indicating modifications in angler activity levels and behaviours. Using real recreational fisheries data from an ongoing radio telemetry study (2018-present), we explored changes in the relative exploitation rates of rainbow trout (
    Sprache Englisch
    Erscheinungsdatum 2022-04-08
    Erscheinungsland Netherlands
    Dokumenttyp Journal Article
    ZDB-ID 196790-3
    ISSN 1573-5133 ; 0378-1909
    ISSN (online) 1573-5133
    ISSN 0378-1909
    DOI 10.1007/s10641-022-01250-8
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  2. Artikel: The impact of the COVID-19 pandemic on a recreational rainbow trout (Oncorhynchus mykiss) fishery

    Bunt, Christopher M. / Jacobson, Bailey

    Environmental biology of fishes. 2022 Apr., v. 105, no. 4

    2022  

    Abstract: There has been a recent flurry of publications describing the potential effects of the COVID-19 pandemic on both commercial and recreational fisheries. As of yet, studies have only provided insights from researchers or industry experts detailing ... ...

    Abstract There has been a recent flurry of publications describing the potential effects of the COVID-19 pandemic on both commercial and recreational fisheries. As of yet, studies have only provided insights from researchers or industry experts detailing perceived consequences, or from survey data indicating modifications in angler activity levels and behaviours. Using real recreational fisheries data from an ongoing radio telemetry study (2018–present), we explored changes in the relative exploitation rates of rainbow trout (Oncorhynchus mykiss; Walbaum 1792) in the Saugeen River, Ontario, a tributary to Lake Huron, before compared to during the pandemic. Restrictions on site access that affected the implementation of important management activities that usually support this popular fishery are also discussed. During the initial phase of complete public lock-downs imposed during spring 2020, angler exploitation rates decreased to half that reported prior to the pandemic. Fishway operations were temporarily suspended and hatchery efforts were interrupted. Once restrictions began to ease in fall 2020, there was an eight-fold increase in overall exploitation rate and a four and a half-fold increase in harvest rate compared to seasons prior to the pandemic. While the full impact of the ongoing pandemic on the Lake Huron fishery is not likely to be fully realized for several years, the potential effects on future return run sizes may need to be considered by fisheries managers monitoring trends in population escapement.
    Schlagwörter COVID-19 infection ; Oncorhynchus mykiss ; fish ladders ; fisheries ; hatcheries ; pandemic ; radio telemetry ; rivers ; spring ; surveys ; Lake Huron ; Ontario
    Sprache Englisch
    Erscheinungsverlauf 2022-04
    Umfang p. 499-507.
    Erscheinungsort Springer Netherlands
    Dokumenttyp Artikel
    ZDB-ID 196790-3
    ISSN 1573-5133 ; 0378-1909
    ISSN (online) 1573-5133
    ISSN 0378-1909
    DOI 10.1007/s10641-022-01250-8
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  3. Artikel ; Online: Exposure to a common urban pollutant affects the survival and swimming behaviour of creek chub (Semotilus atromaculatus).

    Bunt, Christopher M / Jacobson, Bailey

    Journal of fish biology

    2021  Band 98, Heft 5, Seite(n) 1410–1420

    Abstract: Anthropogenic effects on the aquatic environment are ever present and ever increasing and while a plethora of aquatic contaminants are known to affect fishes, one ubiquitous and increasingly prevalent world-wide urban runoff pollutant is frequently ... ...

    Abstract Anthropogenic effects on the aquatic environment are ever present and ever increasing and while a plethora of aquatic contaminants are known to affect fishes, one ubiquitous and increasingly prevalent world-wide urban runoff pollutant is frequently disregarded, and that is pet waste. While dog waste has been identified as a significant factor contributing to bacteria and nutrient loading within receiving waters and the associated water quality changes are known to affect fishes, the impact of uncollected dog faeces on urban fish populations has never been directly investigated. In this study we exposed creek chub (Semotilus atromaculatus), a widespread tolerant stream minnow, to various realistic concentrations of dog waste as simulated urban park runoff testing both fresh and dried dog faeces in both stagnant and aerated water for 96 h to investigate the impact on fish survival and behaviour. Creek chub percentage mortality increased significantly relative to controls and across an exposure gradient and was likely caused by anoxic conditions. Survivors were initially smaller while those that died were initially larger and presented with abnormal abdominal subdermal lesions post-exposure. Additional indicators of physiological stress included significantly increased rates of aquatic surface respiration and changes in flume test derived swimming motivation metrics with increased exposure concentrations. Both mortality and behavioural responses were alleviated by aeration. Furthermore, trials with fresh and dried faeces differed only in time-to-death and swimming metrics where results from dried trials were similar to those from aerated experiments. Results demonstrated the impact that the global dog waste management problem can have on aquatic communities with effects on creek chub likely to be more severe for less pollution-tolerant species and also likely to be exacerbated under future scenarios that consider climate change and increased urbanization.
    Mesh-Begriff(e) Animals ; Behavior, Animal/drug effects ; Cyprinidae/physiology ; Dogs ; Environmental Exposure ; Feces ; Rivers/chemistry ; Survival Analysis ; Swimming/physiology ; Urbanization ; Water Pollutants/toxicity
    Chemische Substanzen Water Pollutants
    Sprache Englisch
    Erscheinungsdatum 2021-02-15
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 410564-3
    ISSN 1095-8649 ; 0022-1112
    ISSN (online) 1095-8649
    ISSN 0022-1112
    DOI 10.1111/jfb.14685
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  4. Artikel: Exposure to a common urban pollutant affects the survival and swimming behaviour of creek chub (Semotilus atromaculatus)

    Bunt, Christopher M. / Jacobson, Bailey

    Journal of fish biology. 2021 May, v. 98, no. 5

    2021  

    Abstract: Anthropogenic effects on the aquatic environment are ever present and ever increasing and while a plethora of aquatic contaminants are known to affect fishes, one ubiquitous and increasingly prevalent world‐wide urban runoff pollutant is frequently ... ...

    Abstract Anthropogenic effects on the aquatic environment are ever present and ever increasing and while a plethora of aquatic contaminants are known to affect fishes, one ubiquitous and increasingly prevalent world‐wide urban runoff pollutant is frequently disregarded, and that is pet waste. While dog waste has been identified as a significant factor contributing to bacteria and nutrient loading within receiving waters and the associated water quality changes are known to affect fishes, the impact of uncollected dog faeces on urban fish populations has never been directly investigated. In this study we exposed creek chub (Semotilus atromaculatus), a widespread tolerant stream minnow, to various realistic concentrations of dog waste as simulated urban park runoff testing both fresh and dried dog faeces in both stagnant and aerated water for 96 h to investigate the impact on fish survival and behaviour. Creek chub percentage mortality increased significantly relative to controls and across an exposure gradient and was likely caused by anoxic conditions. Survivors were initially smaller while those that died were initially larger and presented with abnormal abdominal subdermal lesions post‐exposure. Additional indicators of physiological stress included significantly increased rates of aquatic surface respiration and changes in flume test derived swimming motivation metrics with increased exposure concentrations. Both mortality and behavioural responses were alleviated by aeration. Furthermore, trials with fresh and dried faeces differed only in time‐to‐death and swimming metrics where results from dried trials were similar to those from aerated experiments. Results demonstrated the impact that the global dog waste management problem can have on aquatic communities with effects on creek chub likely to be more severe for less pollution‐tolerant species and also likely to be exacerbated under future scenarios that consider climate change and increased urbanization.
    Schlagwörter Semotilus atromaculatus ; aeration ; aquatic environment ; climate change ; dogs ; feces ; hydraulic flumes ; minnows ; mortality ; motivation ; pollutants ; streams ; urban parks ; urban runoff ; urbanization ; waste management ; wastes ; water quality
    Sprache Englisch
    Erscheinungsverlauf 2021-05
    Umfang p. 1410-1420.
    Erscheinungsort Blackwell Publishing Ltd
    Dokumenttyp Artikel
    Anmerkung JOURNAL ARTICLE
    ZDB-ID 410564-3
    ISSN 1095-8649 ; 0022-1112
    ISSN (online) 1095-8649
    ISSN 0022-1112
    DOI 10.1111/jfb.14685
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  5. Artikel: Rainbow Trout Migration and Use of a Nature‐Like Fishway at a Great Lakes Tributary

    Bunt, Christopher / Jacobson, Bailey

    North American journal of fisheries management. 2019 June, v. 39, no. 3

    2019  

    Abstract: Rainbow Trout Oncorhynchus mykiss were monitored over two consecutive vernal migration periods at a nature‐like fishway on the Beaver River, Ontario, to assess attraction efficiency, passage efficiency, multiple fish passage metrics, and interannual ... ...

    Abstract Rainbow Trout Oncorhynchus mykiss were monitored over two consecutive vernal migration periods at a nature‐like fishway on the Beaver River, Ontario, to assess attraction efficiency, passage efficiency, multiple fish passage metrics, and interannual return rates from Georgian Bay, Lake Huron. Fishway evaluations have shifted to fill knowledge gaps related to the passage of nonsalmonids; however, surprisingly little work has been conducted with Rainbow Trout, with no known study assessing attraction or passage at a nature‐like fishway. Attraction efficiency was 53% and passage efficiency was 100% in 2017; only two of the radio‐tagged fish returned to the fishway in 2018. Upstream passage through the fishway required an average time of 152 ± 122 min. Fish spent 19–43 d upstream before returning to Lake Huron, where downstream passage required as little as 15 min. Overall, there were no significant relationships between any of the fish passage metrics and fish size or condition. These results can be used as a foundation for anadromous O. mykiss subspecies passage research and suggest that fisheries managers may need to adjust annual fishway counts. Future research should focus on developing methods to directly integrate temporal passage metrics into estimates of fishway efficiency.
    Schlagwörter Oncorhynchus mykiss ; administrative management ; anadromous fish ; fish ladders ; radio frequency identification ; rivers ; Lake Huron ; Ontario
    Sprache Englisch
    Erscheinungsverlauf 2019-06
    Umfang p. 460-467.
    Erscheinungsort John Wiley & Sons, Ltd
    Dokumenttyp Artikel
    Anmerkung JOURNAL ARTICLE
    ZDB-ID 779391-1
    ISSN 0275-5947
    ISSN 0275-5947
    DOI 10.1002/nafm.10285
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  6. Artikel: Predation of a brown bat (Vespertilionidae) by a Green Frog (Lithobates clamitans) in Ontario, Canada

    Bunt, Christopher / Webster, Jeremy J. / Jacobson, Bailey / Vilella, Fabio

    Canadian field-naturalist. 2021, v. 135, no. 1

    2021  

    Abstract: On 31 July 2019, a Green Frog (Lithobates clamitans) was observed consuming a Big Brown Bat (Eptesicus fuscus) at Meux Creek, Neustadt, Ontario. The bat was likely roosting at a nearby undercut bank when it was predated by the frog, which required nearly ...

    Abstract On 31 July 2019, a Green Frog (Lithobates clamitans) was observed consuming a Big Brown Bat (Eptesicus fuscus) at Meux Creek, Neustadt, Ontario. The bat was likely roosting at a nearby undercut bank when it was predated by the frog, which required nearly 90 min to consume its prey. This is the first record of a Green Frog consuming a bat species in Canada.
    Schlagwörter Eptesicus fuscus ; Rana clamitans ; frogs ; predation ; streams ; Ontario
    Sprache Englisch
    Umfang p. 58-60.
    Erscheinungsort Ottawa Field-Naturalists' Club
    Dokumenttyp Artikel
    ZDB-ID 2658336-7
    ISSN 0008-3550
    ISSN 0008-3550
    DOI 10.22621/cfn.v135i1.2579
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  7. Artikel ; Forschungsdaten: (mit Forschungsdaten) Phenotype‐dependent selection underlies patterns of sorting across habitats: the case of stream‐fishes

    Jacobson, Bailey / Frédérique Dubois / Pedro R. Peres‐Neto

    Oikos. 2017 Nov., v. 126, no. 11

    2017  

    Abstract: Spatial and temporal heterogeneity within landscapes influences the distribution and phenotypic diversity of individuals both within and across populations. Phenotype–habitat correlations arise either through phenotypes within an environment altering ... ...

    Abstract Spatial and temporal heterogeneity within landscapes influences the distribution and phenotypic diversity of individuals both within and across populations. Phenotype–habitat correlations arise either through phenotypes within an environment altering through the process of natural selection or plasticity, or phenotypes remaining constant but individuals altering their distribution across environments. The mechanisms of non‐random movement and phenotype‐dependent habitat choice may account for associations within highly heterogeneous systems, such as streams, where local adaptation may be negated, plasticity too costly and movement is particularly important. Despite growing attention, however, few empirical tests have yet to be conducted. Here we provide a test of phenotype‐dependent habitat choice and ask: 1) if individuals collected from a single habitat type continue to select original habitat; 2) if decisions are phenotype‐dependent and functionally related to habitat requirements; and 3) if phenotypic‐sorting continues despite increasing population density. To do so we both conducted experimental trials manipulating the density of four stream‐fish species collected from either a single riffle or pool and developed a game‐theoretical model exploring the influence of individuals’ growth rate, sampling and competitive abilities as well as interference on distribution across two habitats as a function of density. Our experimental trials show individuals selecting original versus alternative habitats differed in their morphologies, that morphologies were functionally related to habitat‐type swimming demands, and that phenotypic‐sorting remained significant (although decreased) as density increased. According to our model this only occurs when phenotypes have contrasting habitat preferences and only one phenotype disperses (i.e. selects alternatives) in response to density pressures. This supports our explanation that empirical habitat selection was due to a combination of collecting a fraction of mobile individuals with different habitat preferences and the exclusion of individuals via scramble competition at increased densities. Phenotype‐dependent habitat choice can thereby account for observed patterns of natural stream‐fish distribution.
    Schlagwörter habitat preferences ; habitats ; landscapes ; models ; natural selection ; phenotype ; phenotypic variation ; plasticity ; population density ; population growth ; streams ; swimming
    Sprache Englisch
    Erscheinungsverlauf 2017-11
    Umfang p. 1660-1671.
    Erscheinungsort Blackwell Publishing Ltd
    Dokumenttyp Artikel ; Forschungsdaten
    Anmerkung JOURNAL ARTICLE
    ZDB-ID 207359-6
    ISSN 0030-1299 ; 0030-1299
    ISSN 0030-1299
    DOI 10.1111/oik.04126
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  8. Artikel ; Online ; Forschungsdaten: (mit Forschungsdaten) The interaction between the spatial distribution of resource patches and population density: consequences for intraspecific growth and morphology.

    Jacobson, Bailey / Grant, James W A / Peres-Neto, Pedro R

    The Journal of animal ecology

    2015  Band 84, Heft 4, Seite(n) 934–942

    Abstract: How individuals within a population distribute themselves across resource patches of varying quality has been an important focus of ecological theory. The ideal free distribution predicts equal fitness amongst individuals in a 1 : 1 ratio with resources, ...

    Abstract How individuals within a population distribute themselves across resource patches of varying quality has been an important focus of ecological theory. The ideal free distribution predicts equal fitness amongst individuals in a 1 : 1 ratio with resources, whereas resource defence theory predicts different degrees of monopolization (fitness variance) as a function of temporal and spatial resource clumping and population density. One overlooked landscape characteristic is the spatial distribution of resource patches, altering the equitability of resource accessibility and thereby the effective number of competitors. While much work has investigated the influence of morphology on competitive ability for different resource types, less is known regarding the phenotypic characteristics conferring relative ability for a single resource type, particularly when exploitative competition predominates. Here we used young-of-the-year rainbow trout (Oncorhynchus mykiss) to test whether and how the spatial distribution of resource patches and population density interact to influence the level and variance of individual growth, as well as if functional morphology relates to competitive ability. Feeding trials were conducted within stream channels under three spatial distributions of nine resource patches (distributed, semi-clumped and clumped) at two density levels (9 and 27 individuals). Average trial growth was greater in high-density treatments with no effect of resource distribution. Within-trial growth variance had opposite patterns across resource distributions. Here, variance decreased at low-population, but increased at high-population densities as patches became increasingly clumped as the result of changes in the levels of interference vs. exploitative competition. Within-trial growth was related to both pre- and post-trial morphology where competitive individuals were those with traits associated with swimming capacity and efficiency: larger heads/bodies/caudal fins and less angled pectoral fins. The different degrees of within-population growth variance at the same density level found here, as a function of spatial resource distribution, provide an explanation for the inconsistencies in within-site growth variance and population regulation often noted with regard to density dependence in natural landscapes.
    Mesh-Begriff(e) Animal Fins/anatomy & histology ; Animals ; Body Size ; Competitive Behavior/physiology ; Ecosystem ; Feeding Behavior/physiology ; Oncorhynchus mykiss/anatomy & histology ; Oncorhynchus mykiss/growth & development ; Phenotype ; Population Density ; Spatial Behavior/physiology
    Sprache Englisch
    Erscheinungsdatum 2015-07
    Erscheinungsland England
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 3024-7
    ISSN 1365-2656 ; 0021-8790 ; 0021-8790
    ISSN (online) 1365-2656
    ISSN 0021-8790
    DOI 10.1111/1365-2656.12365
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  9. Artikel ; Forschungsdaten: (mit Forschungsdaten) The interaction between the spatial distribution of resource patches and population density: consequences for intraspecific growth and morphology

    Jacobson, Bailey / Grant, James W. A / Peres‐Neto, Pedro R / Amarasekare, Priyanga

    journal of animal ecology. 2015 July, v. 84, no. 4

    2015  

    Abstract: How individuals within a population distribute themselves across resource patches of varying quality has been an important focus of ecological theory. The ideal free distribution predicts equal fitness amongst individuals in a 1 : 1 ratio with resources, ...

    Abstract How individuals within a population distribute themselves across resource patches of varying quality has been an important focus of ecological theory. The ideal free distribution predicts equal fitness amongst individuals in a 1 : 1 ratio with resources, whereas resource defence theory predicts different degrees of monopolization (fitness variance) as a function of temporal and spatial resource clumping and population density. One overlooked landscape characteristic is the spatial distribution of resource patches, altering the equitability of resource accessibility and thereby the effective number of competitors. While much work has investigated the influence of morphology on competitive ability for different resource types, less is known regarding the phenotypic characteristics conferring relative ability for a single resource type, particularly when exploitative competition predominates. Here we used young‐of‐the‐year rainbow trout (Oncorhynchus mykiss) to test whether and how the spatial distribution of resource patches and population density interact to influence the level and variance of individual growth, as well as if functional morphology relates to competitive ability. Feeding trials were conducted within stream channels under three spatial distributions of nine resource patches (distributed, semi‐clumped and clumped) at two density levels (9 and 27 individuals). Average trial growth was greater in high‐density treatments with no effect of resource distribution. Within‐trial growth variance had opposite patterns across resource distributions. Here, variance decreased at low‐population, but increased at high‐population densities as patches became increasingly clumped as the result of changes in the levels of interference vs. exploitative competition. Within‐trial growth was related to both pre‐ and post‐trial morphology where competitive individuals were those with traits associated with swimming capacity and efficiency: larger heads/bodies/caudal fins and less angled pectoral fins. The different degrees of within‐population growth variance at the same density level found here, as a function of spatial resource distribution, provide an explanation for the inconsistencies in within‐site growth variance and population regulation often noted with regard to density dependence in natural landscapes.
    Schlagwörter Oncorhynchus mykiss ; animal growth ; animal morphology ; fins ; landscapes ; population density ; spatial distribution ; stream channels ; swimming ; variance
    Sprache Englisch
    Erscheinungsverlauf 2015-07
    Umfang p. 934-942.
    Erscheinungsort Blackwell Scientific Publ.
    Dokumenttyp Artikel ; Forschungsdaten
    ZDB-ID 3024-7
    ISSN 1365-2656 ; 0021-8790 ; 0021-8790
    ISSN (online) 1365-2656
    ISSN 0021-8790
    DOI 10.1111/1365-2656.12365
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  10. Artikel: Quantifying and disentangling dispersal in metacommunities: how close have we come? How far is there to go

    Jacobson, Bailey / Peres-Neto, Pedro R

    Landscape ecology. 2010 Apr., v. 25, no. 4

    2010  

    Abstract: Much of ecological research centers around discovering the underlying factors for species distribution; three such factors are of central importance: local environment, landscape features and dispersal. While all have been simplified in the past, the ... ...

    Abstract Much of ecological research centers around discovering the underlying factors for species distribution; three such factors are of central importance: local environment, landscape features and dispersal. While all have been simplified in the past, the recent increase in metapopulation and metacommunity research makes being able to quantify dispersal all that much more necessary. In order to increase our knowledge about metacommunities in the “real word”, it is clearly time to start thinking critically about whether and how the methods that are currently available for measuring dispersal within metapopulations can be adapted. The goal of this contribution is to present and argue the technical difficulties involved in measuring dispersal within metacommunities through: (1) discussing the merits and pitfalls of some potential direct (e.g., mark-recapture) and indirect methods (e.g., isolation measures, patchiness) for studying the effects of dispersal at the metapopulation and metacommunity level; (2) discuss the types of questions that can be tackled at the metacommunity level in light of methodological decisions; and (3) make the point that the technical difficulties of measuring dispersal for multiple species may leave us with little other options than using indirect methods to estimate dispersal in metacommunities.
    Schlagwörter biogeography ; landscapes ; population distribution ; quantitative analysis
    Sprache Englisch
    Erscheinungsverlauf 2010-04
    Umfang p. 495-507.
    Verlag Springer Netherlands
    Erscheinungsort Dordrecht
    Dokumenttyp Artikel
    ZDB-ID 1027798-5
    ISSN 1572-9761 ; 0921-2973
    ISSN (online) 1572-9761
    ISSN 0921-2973
    DOI 10.1007/s10980-009-9442-9
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