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Gopko M, Tkachenko D, Shpagina A, Maximenko D, Mironova E. Is vision deterioration responsible for changes in the host's behavior caused by eye flukes? Int J Parasitol 2023; 53:731-738. [PMID: 37419175 DOI: 10.1016/j.ijpara.2023.06.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Revised: 05/23/2023] [Accepted: 06/06/2023] [Indexed: 07/09/2023]
Abstract
Trematodes localizing in the lenses of fish change the behavior of their hosts. These behavioral changes are widely suggested to be parasitic manipulations of host behavior aimed at increasing the possibility of eye flukes completing their life cycle. It is often assumed that fish change their behavior due to the vision deterioration caused by trematode larvae. We checked this assumption by testing Salvelinus malma infected with eye flukes (Diplostomum pseudospathaceum) under different lighting conditions. We suggested that if the parasite alters the host's behavior through vision impairment, then in the dark (when fish do not rely on vision to navigate), the difference in the behavior of infected and uninfected fish would disappear. Eye flukes, indeed, changed fish behavior, making their hosts less vigilant. We believe this is the first evidence of possible parasitic manipulation in this study system. However, contrary to expectations, the difference in the behavior of infected and control fish was independent of the lighting conditions. Our results suggest that mechanisms of behavioral change other than vision impairment should be taken into account in this fish-eye fluke study system.
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Affiliation(s)
- Mikhail Gopko
- A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Leninskij prosp., 33, 119071 Moscow, Russia.
| | - Darya Tkachenko
- Russian State Agrarian University - Moscow Timiryazev Agricultural Academy, Timiryazevskaya St., 49, 127550 Moscow, Russia; N.F. Gamaleya National Research Center, Medgamal branch, Gamaleya St., 18, 123098 Moscow, Russia
| | - Anastasia Shpagina
- A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Leninskij prosp., 33, 119071 Moscow, Russia; Russian State Agrarian University - Moscow Timiryazev Agricultural Academy, Timiryazevskaya St., 49, 127550 Moscow, Russia
| | - Darya Maximenko
- Russian State Agrarian University - Moscow Timiryazev Agricultural Academy, Timiryazevskaya St., 49, 127550 Moscow, Russia
| | - Ekaterina Mironova
- A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Leninskij prosp., 33, 119071 Moscow, Russia
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2
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Mironova E, Gopko M, Pasternak A, Mikheev V, Taskinen J. Allee effect in a manipulative parasite within poikilothermic host under temperature change. Parasitology 2022; 149:35-43. [PMID: 35184786 PMCID: PMC11010467 DOI: 10.1017/s0031182021001529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Revised: 08/04/2021] [Accepted: 08/20/2021] [Indexed: 11/07/2022]
Abstract
Temperature and intraspecific competition are important factors influencing the growth of all organisms, including parasites. The temperature increase is suggested to stimulate the development of parasites within poikilothermic hosts. However, at high parasite densities, this effect could be diminished, due to stronger intraspecific competition. Our study, for the first time, addressed the joint effects of warming and parasite abundances on parasite growth in poikilothermic hosts. The growth of the common fish parasite larvae (trematode Diplostomum pseudospathaceum) within the rainbow trout at different infection intensities and temperatures (15°C and 18°C) was experimentally investigated. The results showed that temperature was positively correlated with both parasite infection success and growth rates. The growth rates increased much more compared to those in many free-living poikilothermic animals. Atypically for a majority of parasites, D. pseudospathaceum larvae grow faster when abundant (Allee effect). The possible causes for this phenomenon (manipulation cost sharing, etc.) are discussed in this study. Importantly, limited evidence of the interaction between temperature and population density was found. It is likely that temperature did not change the magnitude of the Allee effect but affected its timing. The impact of these effects is supposed to become more pronounced in freshwater ecosystems under current climate changes.
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Affiliation(s)
- Ekaterina Mironova
- A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Leninskij prosp., 33, 119071Moscow, Russia
| | - Mikhail Gopko
- A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Leninskij prosp., 33, 119071Moscow, Russia
| | - Anna Pasternak
- Shirshov Institute of Oceanology, Russian Academy of Sciences, Nahimovskiy prosp., 36, 117997Moscow, Russia
| | - Viktor Mikheev
- A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Leninskij prosp., 33, 119071Moscow, Russia
| | - Jouni Taskinen
- Department of Biological and Environmental Science, University of Jyväskylä, P.O. Box 35, FIN-40014 Jyväskylä, Finland
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Duan Y, von Gersdorff Jørgensen L, Kania PW, Karami AM, Al‐Jubury A, Buchmann K. Eye fluke effects on Danish freshwater fish: Field and experimental investigations. JOURNAL OF FISH DISEASES 2021; 44:1785-1798. [PMID: 34289126 PMCID: PMC9292478 DOI: 10.1111/jfd.13496] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Revised: 07/03/2021] [Accepted: 07/07/2021] [Indexed: 06/13/2023]
Abstract
Eye flukes in fish are common in freshwater lakes. Fish become infected by the penetration of cercariae released from freshwater snails, and high infection pressures may be associated with mortalities in a Danish lake. Examination of two other freshwater lakes, combined with laboratory study, supported the notion. We investigated 77 freshwater fish from two lakes and the infection level suggested the occurrence of a high cercarial infection pressure in the Danish lakes. Dominant genera were Tylodelphys and Diplostomum covering a range of species identified by PCR and sequencing of the 18S (partial)-ITS1-5.8S-ITS2-28S (partial) of the rDNA. Cercariae of the prevalent species Diplostomum pseudospathaceum were used to infect zebrafish Danio rerio for the elucidation of short-term effects on the fish host. Zebrafish did not display abnormal behaviour when exposed to 200-400 cercariae, but a dosage of 600 and 1,000 cercariae/fish proved lethal. When fish were exposed to sublethal dosages, 19 out of 27 immune genes were significantly regulated and three genes encoding cytokine (IL 4/13B, IL-6 and IL-8) were upregulated at 3 hr post-infection (hpi), whereas others were downregulated especially at a later time point. We suggest that direct massive cercarial penetration of fish surfaces may be detrimental and may represent a threat to fish populations.
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Affiliation(s)
- Yajiao Duan
- Laboratory of Aquatic PathobiologyDepartment of Veterinary and Animal SciencesFaculty of Health and Medical SciencesUniversity of CopenhagenFrederiksberg CDenmark
| | - Louise von Gersdorff Jørgensen
- Laboratory of Aquatic PathobiologyDepartment of Veterinary and Animal SciencesFaculty of Health and Medical SciencesUniversity of CopenhagenFrederiksberg CDenmark
| | - Per Walter Kania
- Laboratory of Aquatic PathobiologyDepartment of Veterinary and Animal SciencesFaculty of Health and Medical SciencesUniversity of CopenhagenFrederiksberg CDenmark
| | - Asma M. Karami
- Laboratory of Aquatic PathobiologyDepartment of Veterinary and Animal SciencesFaculty of Health and Medical SciencesUniversity of CopenhagenFrederiksberg CDenmark
| | - Azmi Al‐Jubury
- Laboratory of Aquatic PathobiologyDepartment of Veterinary and Animal SciencesFaculty of Health and Medical SciencesUniversity of CopenhagenFrederiksberg CDenmark
| | - Kurt Buchmann
- Laboratory of Aquatic PathobiologyDepartment of Veterinary and Animal SciencesFaculty of Health and Medical SciencesUniversity of CopenhagenFrederiksberg CDenmark
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4
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Glochidial infection by the endangered Margaritifera margaritifera (Mollusca) increased survival of salmonid host (Pisces) during experimental Flavobacterium disease outbreak. Parasitol Res 2021; 120:3487-3496. [PMID: 34427787 PMCID: PMC8460588 DOI: 10.1007/s00436-021-07285-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Accepted: 08/09/2021] [Indexed: 11/24/2022]
Abstract
Co-infections are common in host-parasite interactions, but studies about their impact on the virulence of parasites/diseases are still scarce. The present study compared mortality induced by a fatal bacterial pathogen, Flavobacterium columnare between brown trout infected with glochidia from the endangered freshwater pearl mussel, Margaritifera margaritifera, and uninfected control fish during the parasitic period and after the parasitic period (i.e. glochidia detached) in a laboratory experiment. We hypothesised that glochidial infection would increase host susceptibility to and/or pathogenicity of the bacterial infection. We found that the highly virulent strain of F. columnare caused an intense disease outbreak, with mortality reaching 100% within 29 h. Opposite to the study hypothesis, both fresh ongoing and past infection (14 months post-infection) with glochidia prolonged the fish host’s survival statistically significantly by 1 h compared to the control fish (two-way ANOVA: fresh-infection, F1, 82 = 7.144, p = 0.009 and post-infection, F1, 51 = 4.227, p = 0.044). Furthermore, fish survival time increased with glochidia abundance (MLR: post-infection, t = 2.103, p = 0.045). The mechanism could be connected to an enhanced non-specific immunity or changed gill structure of the fish, as F. columnare enters the fish body mainly via the gills, which is also the glochidia’s attachment site. The results increase current knowledge about the interactions between freshwater mussels and their (commercially important) fish hosts and fish pathogens and also emphasise the importance of (unknown) ecosystem services (e.g., protection against pathogens) potentially associated with imperilled freshwater mussels.
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Ruehle BP, Poulin R. Potential multidimensional behavioural impacts of differential infection in two fish populations. BEHAVIOUR 2020. [DOI: 10.1163/1568539x-bja10029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Abstract
Parasites can influence the behaviour of their hosts, however investigations on how they may shape multiple personality traits are uncommon. The flatworm parasite Tylodelphys darbyi resides in the eyes of common bully, Gobiomorphus cotidianus, a locally common fish host to a range of other parasites that could also influence their behaviour. Here we assess how parasitism may be related to personality traits of two G. cotidianus populations; one where T. darbyi is highly abundant and one where the parasite is absent. We hypothesized that T. darbyi would have a stronger association with the different personality traits than other parasite taxa, and that the effects of infection on personality traits would vary between populations. Our results demonstrate that T. darbyi infections correlate with boldness, exploration, and activity within and among individuals. Further, we show that the relationship and therefore possible influence of other parasites, e.g., Apatemon sp., on personality traits vary between two host populations. Our study has revealed potential patterns highlighting how parasitism may differentially contribute to behavioural and ecological divergence among host populations.
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Affiliation(s)
- Brandon P. Ruehle
- Department of Zoology, University of Otago, 340 Great King Street, North Dunedin, Dunedin 9016, New Zealand
| | - Robert Poulin
- Department of Zoology, University of Otago, 340 Great King Street, North Dunedin, Dunedin 9016, New Zealand
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6
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Species-specific patterns in cercarial emergence of Diplostomum spp. from snails Radix lagotis. Int J Parasitol 2020; 50:1177-1188. [PMID: 32896571 DOI: 10.1016/j.ijpara.2020.07.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2020] [Revised: 07/07/2020] [Accepted: 07/12/2020] [Indexed: 11/21/2022]
Abstract
The cercarial emergence patterns of three species of Diplostomum (Diplostomum 'mergi', Diplostomum spathaceum and Diplostomum parviventosum) parasitizing freshwater first intermediate host Radix lagotis sampled in Most Lake, Czech Republic, were studied under various experimental conditions, i.e. field, laboratory and incubator, and seasons, i.e. spring, summer and autumn. We discovered unexpected daily periodicity-dependent species-specific emergence patterns among the three Diplostomum spp. depending on experimental conditions. At the same time, the intraspecific variation of D. spathaceum cercarial release in response to seasonal conditions was observed. We found that a complex array of mechanisms can affect Diplostomum species-specific patterns in cercarial emergence, of which behavioural characteristics of fish related to reproduction and feeding processes are considered the most important factors. This might represent a specific adaptive evolutionary mechanism to maximise transmission success while avoiding competition for host resources. Our results contribute to a better understanding of ecological and epidemiological aspects with respect to specific adaptive strategies compartmentalised among species of Diplostomum and consequences for infection risk in fish hosts.
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Gopko M, Mironova E, Pasternak A, Mikheev V, Taskinen J. Parasite transmission in aquatic ecosystems under temperature change: effects of host activity and elimination of parasite larvae by filter‐feeders. OIKOS 2020. [DOI: 10.1111/oik.07414] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mikhail Gopko
- Severtsov Inst. of Ecology and Evolution RAS, Laboratory for Behaviour of Lower Vertebrates Moscow Russia
| | - Ekaterina Mironova
- Severtsov Inst. of Ecology and Evolution RAS, Center of Parasitology Moscow Russia
| | - Anna Pasternak
- Shirshov Inst. of Oceanology RAS, Plankton ecology laboratory Moscow Russia
| | - Victor Mikheev
- Severtsov Inst. of Ecology and Evolution RAS, Laboratory for Behaviour of Lower Vertebrates Moscow Russia
| | - Jouni Taskinen
- Jyväskylän Yliopisto, Dept of Biological and Environmental Science Jyväskylä Finland
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Nicola DN, Affonso IP, Takemoto RM. Behavioral changes in host foraging: Experiments with Clinostomum (Trematoda, Digenea) parasitizing Loricariichthys platymetopon (Loricariidae). Exp Parasitol 2020; 216:107916. [PMID: 32590020 DOI: 10.1016/j.exppara.2020.107916] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Revised: 12/18/2019] [Accepted: 05/14/2020] [Indexed: 11/18/2022]
Abstract
Complex life cycle parasites can manipulate the behavior of intermediate hosts in order to reduce their fitness and increase the chance of completing life cycle. In order to understand the effects of the trematode parasites of the genus Clinostomum on host fish Loricariichthys platymetopon, a filmed experiment was carried out to quantify the foraging activity of hosts with different intensities of infection. The results suggest that hosts with higher parasite intensities reduced foraging activity early in the morning when compared to hosts with low intensities. This period may be critical for hosts since birds, the target hosts of such trematodes, forage intensively at dawn.
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Affiliation(s)
- Danilo N Nicola
- Laboratório de Ictioparasitologia, Núcleo de Pesquisas em Limnologia, Ictiologia e Aquicultura-Nupélia, Universidade Estadual de Maringá, Bloco G-90, Av. Colombo, 5790, CEP 87020-900, Maringá, PR, Brazil; Programa de Pós-Graduação em Biologia comparada PGB - UEM, Brazil.
| | - Igor P Affonso
- Laboratório de Ecologia, Universidade Tecnológica Federal do Paraná - UTFPR, Av. Monteiro Lobato Km 4, Ponta Grossa - Paraná CEP, 84016-210, Brazil.
| | - Ricardo M Takemoto
- Laboratório de Ictioparasitologia, Núcleo de Pesquisas em Limnologia, Ictiologia e Aquicultura-Nupélia, Universidade Estadual de Maringá, Bloco G-90, Av. Colombo, 5790, CEP 87020-900, Maringá, PR, Brazil; Programa de Pós-Graduação em Biologia comparada PGB - UEM, Brazil.
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9
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Mikheev VN, Pasternak AF, Taskinen J. Personality Influences Risk of Parasitism in Fish. DOKLADY BIOLOGICAL SCIENCES : PROCEEDINGS OF THE ACADEMY OF SCIENCES OF THE USSR, BIOLOGICAL SCIENCES SECTIONS 2019; 488:141-144. [PMID: 31732899 DOI: 10.1134/s0012496619050053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Revised: 07/09/2019] [Accepted: 07/09/2019] [Indexed: 06/10/2023]
Abstract
Influence of fish personality on infection rate is poorly studied. In the experiments on young-of-the-year Oncorhynchus mykiss and cercariae of the trematode Diplostomum pseudospathaceum, we tested the hypothesis that infection rate differs between more and less active ("bold" and "shy") fish. Will individual differences in infection persist upon re-infection? Fish serve as a second intermediate host for this trematode. Positive correlation was found between the results of consecutive infections. Accumulation of parasites with successive infections leads to an aggregated distribution of D. pseudospathaceum among the hosts, affecting individual fitness and polymorphism in fish populations. Persistent individual differences in parasite burden among fish and, as a result, vulnerability for predators confirms the role of parasites as an important factor of natural selection.
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Affiliation(s)
- V N Mikheev
- Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, 119071, Moscow, Russia.
| | - A F Pasternak
- Shirshov Institute of Oceanology, Russian Academy of Sciences, 119071, Moscow, Russia
| | - J Taskinen
- Department of the Biological and Environmental Science, University of Jyväskylä, 40351, Jyväskylä, Finland
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Behringer DC, Karvonen A, Bojko J. Parasite avoidance behaviours in aquatic environments. Philos Trans R Soc Lond B Biol Sci 2019; 373:rstb.2017.0202. [PMID: 29866915 DOI: 10.1098/rstb.2017.0202] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/09/2018] [Indexed: 02/05/2023] Open
Abstract
Parasites, including macroparasites, protists, fungi, bacteria and viruses, can impose a heavy burden upon host animals. However, hosts are not without defences. One aspect of host defence, behavioural avoidance, has been studied in the terrestrial realm for over 50 years, but was first reported from the aquatic environment approximately 20 years ago. Evidence has mounted on the importance of parasite avoidance behaviours and it is increasingly apparent that there are core similarities in the function and benefit of this defence mechanism between terrestrial and aquatic systems. However, there are also stark differences driven by the unique biotic and abiotic characteristics of terrestrial and aquatic (marine and freshwater) environments. Here, we review avoidance behaviours in a comparative framework and highlight the characteristics of each environment that drive differences in the suite of mechanisms and cues that animals use to avoid parasites. We then explore trade-offs, potential negative effects of avoidance behaviour and the influence of human activities on avoidance behaviours. We conclude that avoidance behaviours are understudied in aquatic environments but can have significant implications for disease ecology and epidemiology, especially considering the accelerating emergence and re-emergence of parasites.This article is part of the Theo Murphy meeting issue 'Evolution of pathogen and parasite avoidance behaviours'.
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Affiliation(s)
- Donald C Behringer
- School of Forest Resources and Conservation, Program in Fisheries and Aquatic Sciences, University of Florida, Gainesville, FL, USA .,Emerging Pathogens Institute, University of Florida, Gainesville, FL, USA
| | - Anssi Karvonen
- Department of Biological and Environmental Science, University of Jyvaskyla, PO Box 35, 40014 Jyvaskyla, Finland
| | - Jamie Bojko
- School of Forest Resources and Conservation, Program in Fisheries and Aquatic Sciences, University of Florida, Gainesville, FL, USA.,Emerging Pathogens Institute, University of Florida, Gainesville, FL, USA
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Øverli Ø, Johansen IB. Kindness to the Final Host and Vice Versa: A Trend for Parasites Providing Easy Prey? Front Ecol Evol 2019. [DOI: 10.3389/fevo.2019.00050] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
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12
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Gabagambi NP, Salvanes AGV, Midtøy F, Skorping A. The tapeworm Ligula intestinalis alters the behavior of the fish intermediate host Engraulicypris sardella, but only after it has become infective to the final host. Behav Processes 2019; 158:47-52. [DOI: 10.1016/j.beproc.2018.11.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Revised: 11/06/2018] [Accepted: 11/09/2018] [Indexed: 11/28/2022]
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13
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Iritani R, Sato T. Host-Manipulation by Trophically Transmitted Parasites: The Switcher-Paradigm. Trends Parasitol 2018; 34:934-944. [DOI: 10.1016/j.pt.2018.08.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2018] [Revised: 08/06/2018] [Accepted: 08/08/2018] [Indexed: 01/09/2023]
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Gopko M, Chowdhury MMR, Taskinen J. Interactions between two parasites of brown trout ( Salmo trutta): Consequences of preinfection. Ecol Evol 2018; 8:9986-9997. [PMID: 30397441 PMCID: PMC6206180 DOI: 10.1002/ece3.4406] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2017] [Revised: 06/22/2018] [Accepted: 06/29/2018] [Indexed: 11/18/2022] Open
Abstract
Preinfection by one parasitic species may facilitate or by contrast hamper the subsequent penetration and/or establishment of other parasites in a host. The biology of interacting species, timing of preinfection, and dosage of subsequent parasite exposure are likely important variables in this multiparasite dynamic infection process. The increased vulnerability to subsequent infection can be an important and often overlooked factor influencing parasite virulence. We investigated how the preinfection by freshwater pearl mussel Margaritifera margaritifera glochidia could influence the success of subsequent infection by the common trematode Diplostomum pseudospathaceum in brown trout Salmo trutta and vice versa whether preinfection by the trematode made fish more susceptible to glochidia infection. The first experiment was repeated twice with different (low and high) exposure doses to initiate the subsequent trematode infection, while in the second experiment we varied the timing of the preinfection with trematodes. The preinfection with glochidia made fish more vulnerable to subsequent infection with trematodes. Since the trematodes penetrate through the gills, we suggest that increased host vulnerability was most likely the result of increased respiration caused by the freshwater pearl mussel glochidia encysted on gills. In turn, brown trout preinfected with trematodes were more vulnerable to the subsequent glochidial infection, but only if they were preinfected shortly before the subsequent infection (20 hr). Fish preinfected with trematodes earlier (2 weeks before the subsequent infection) did not differ in their vulnerability to glochidia. These effects were observed at moderate intensities of infections similar to those that occur in nature. Our study demonstrates how the timing and sequence of exposure to parasitic species can influence infection success in a host-multiparasite system. It indicates that the negative influence of glochidia on host fitness is likely to be underestimated and that this should be taken into consideration when organizing freshwater pearl mussel restoration procedures.
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Affiliation(s)
- Mikhail Gopko
- A.N. Severtsov Institute of Ecology and EvolutionRussian Academy of SciencesMoscowRussia
| | - M. Motiur R. Chowdhury
- Department of Biological and Environmental ScienceUniversity of JyväskyläJyvaskylaFinland
| | - Jouni Taskinen
- Department of Biological and Environmental ScienceUniversity of JyväskyläJyvaskylaFinland
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Abstract
Removal of parasite free-living stages by predators has previously been suggested an important factor controlling parasite transmission in aquatic habitats. Experimental studies of zooplankton predation on macroparasite larvae are, however, scarce. We tested whether trematode cercariae, which are often numerous in shallow waters, are suitable prey for syntopic zooplankters. Feeding rates and survival of freshwater cyclopoids (Megacyclops viridis, Macrocyclops distinctus), calanoids (Arctodiaptomus paulseni), cladocerans (Sida crystallina) and rotifers Asplanchna spp., fed with cercariae of Diplostomum pseudospathaceum, a common fish trematode, were studied. In additional long-term experiments, we studied reproduction of cyclopoids fed with cercariae. All tested zooplankton species consumed cercariae. The highest feeding rates were observed for cyclopoids (33 ± 12 cercariae ind-1 h-1), which actively reproduced (up to one egg clutch day-1) when fed ad libitum with cercariae. Their reproductive characteristics did not change significantly with time, indicating that cercariae supported cyclopoids' dietary needs. Mortality of rotifers and cladocerans was high (25-28% individuals) when exposed to cercariae in contrast to cyclopoids and calanoids (<2%). Cercariae clogged the filtration apparatus of cladocerans and caused internal injuries in predatory rotifers, which ingested cercariae. Observed trophic links between common freshwater zooplankters and cercariae may significantly influence food webs and parasite transmission in lentic ecosystems.
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Klemme I, Karvonen A. Shoaling with infected conspecifics does not improve resistance to trematode infection. Ethology 2018. [DOI: 10.1111/eth.12717] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ines Klemme
- Department of Biological and Environmental Science; University of Jyvaskyla; Jyvaskyla Finland
| | - Anssi Karvonen
- Department of Biological and Environmental Science; University of Jyvaskyla; Jyvaskyla Finland
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17
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Rahn AK, Vitt S, Drolshagen L, Scharsack JP, Rick IP, Bakker TCM. Parasitic infection of the eye lens affects shoaling preferences in three-spined stickleback. Biol J Linn Soc Lond 2017. [DOI: 10.1093/biolinnean/blx155] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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18
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Kortet R, Lautala T, Kekäläinen J, Taskinen J, Hirvonen H. Maternal effects in vulnerability to eye-parasites and correlations between behavior and parasitism in juvenile Arctic charr. Ecol Evol 2017; 7:8780-8787. [PMID: 29152177 PMCID: PMC5677498 DOI: 10.1002/ece3.3428] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2017] [Revised: 08/21/2017] [Accepted: 08/25/2017] [Indexed: 11/10/2022] Open
Abstract
Hatchery‐reared fish show high mortalities after release to the wild environment. Explanations for this include potentially predetermined genetics, behavioral, and physiological acclimation to fish farm environments, and increased vulnerability to predation and parasitism in the wild. We studied vulnerability to Diplostomum spp. parasites (load of eye flukes in the lenses), immune defense (relative spleen size) and antipredator behaviors (approaches toward predator odor, freezing, and swimming activity) in hatchery‐reared juvenile Arctic charr (Salvelinus alpinus) using a nested mating design. Fish were exposed to eye‐fluke larvae via the incoming water at the hatchery. Fish size was positively associated with parasite load, but we did not find any relationship between relative spleen size and parasitism. The offspring of different females showed significant variation in their parasite load within sires, implying a dam effect in the vulnerability to parasites. However, the family background did not have any effect on spleen size. In the mean sire level over dams, the fish from the bolder (actively swimming) families in the predator trials suffered higher loads of eye flukes than those from more cautiously behaving families. Thus, the results indicate potentially maternally inherited differences in vulnerability to eye‐fluke parasites, and that the vulnerability to parasites and behavioral activity are positively associated with each other at the sire level. This could lead to artificial and unintentional selection for increased vulnerability to both parasitism and predation if these traits are favored in fish farm environments.
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Affiliation(s)
- Raine Kortet
- Department of Environmental and Biological Sciences University of Eastern Finland Joensuu Finland
| | - Tiina Lautala
- Behaviour, Ecology and Evolution Team (Integrative Ecology Unit) Department of Biological and Environmental Sciences University of Helsinki Helsinki Finland
| | - Jukka Kekäläinen
- Department of Environmental and Biological Sciences University of Eastern Finland Joensuu Finland
| | - Jouni Taskinen
- Department of Biological and Environmental Science University of Jyväskylä Jyväskylä Finland
| | - Heikki Hirvonen
- Behaviour, Ecology and Evolution Team (Integrative Ecology Unit) Department of Biological and Environmental Sciences University of Helsinki Helsinki Finland
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Differences between populations in host manipulation by the tapeworm Schistocephalus solidus - is there local adaptation? Parasitology 2017; 145:762-769. [PMID: 29113596 DOI: 10.1017/s0031182017001792] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Host manipulation whereby a parasite increases its transmission to a subsequent host by altering the behaviour of its current host is very far spread. It also occurs in host-parasite systems that are widely distributed. This offers the potential for local adaptation. The tapeworm Schistocephalus solidus modifies its first intermediate copepod host's predation susceptibility to suit its own needs by reducing its activity before it becomes infective and increasing it thereafter. To investigate potential differences in host manipulation between different populations and test for potential local adaptation with regard to host manipulation, I experimentally infected hosts from two distinct populations with parasites from either population in a fully crossed design. Host manipulation differed between populations mostly once the parasite had reached infectivity. These differences in infective parasites were mostly due to differences between different parasite populations. In not yet infective parasites, however, host population also had a significant effect on host manipulation. There was no evidence of local adaptation; parasites were able to manipulate foreign and local hosts equally well. Likewise, hosts were equally poor at resisting host manipulation by local and foreign parasites.
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Stage-dependent behavioural changes but early castration induced by the acanthocephalan parasite Polymorphus minutus in its Gammarus pulex intermediate host. Parasitology 2017; 145:260-268. [DOI: 10.1017/s0031182017001457] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
SUMMARYMultidimensionality in parasite-induced phenotypic alterations (PIPA) has been observed in a large number of host–parasite associations, particularly in parasites with complex life cycles. However, it is still unclear whether such a syndrome is due to the successive activation of independent PIPAs, or results from the synchronous disruption of a single mechanism. The aim of the present study was to investigate the onset and progression of two PIPAs (a behavioural alteration: reversion of geotaxis, and castration) occurring in the crustacean amphipod Gammarus pulex infected with the acanthocephalan Polymorphus minutus, at different parasite developmental stages. Modifications of geotaxis in hosts differed according to the parasite developmental stage. Whereas the cystacanth stage induced a negative geotaxis (exposing the gammarid to predation by birds, the definitive hosts), the acanthella stage, not yet infective for the definitive host, induced a stronger positive geotaxis (presumably protecting gammarids from bird predation). In contrast, castration was almost total at the acanthella stage, with no significant variation in the intensity according to parasite maturation. Finally, no significant correlation was found between the intensity of behavioural changes and the intensity of castration. We discuss our results in relation with current views on the evolution of multidimensionality in PIPA.
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Spatial and temporal distribution of Ligula intestinalis (Cestoda: Diphyllobothriidea) in usipa (Engraulicypris sardella) (Pisces: Cyprinidae) in Lake Nyasa. J Helminthol 2017; 92:410-416. [PMID: 28818117 DOI: 10.1017/s0022149x17000724] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Engraulicypris sardella is an endemic and economically important cyprinid species in Lake Nyasa/Malawi which has recently been infected by the tapeworm Ligula intestinalis. This parasite is known to induce severe pathological and behavioural effects on other cyprinids, including castration, followed by a collapse of infected populations. As a first step to understanding the dynamics between this parasite and E. sardella, we studied the spatial and temporal variation in prevalence over a period of 1 year. Overall prevalence was about 15%, but we observed a consistently higher prevalence in the littoral compared to the pelagic zone. Fish in the upper water levels showed the highest prevalence, with a marked decline with increasing water depth down to 150 m. The proportion of infected fish varied over time, with a significantly higher prevalence in the rainy season. In a huge lake like the Nyasa, with a surface area of 29,000 km2 and a maximum depth of 785 m, the transmission success of the parasite appears to show large variations in time and space. We suggest that these conditions could lead the parasite to become persistent within the lake, rather than the typical epidemic situation as observed in smaller bodies of water.
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Freshwater mussels (Anodonta anatina) reduce transmission of a common fish trematode (eye fluke, Diplostomum pseudospathaceum). Parasitology 2017; 144:1971-1979. [PMID: 28766473 DOI: 10.1017/s0031182017001421] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Recent results suggest that bivalves can play an important role in restraining the spread of various aquatic infections. However, the ability of mussels to remove free-living stages of macroparasites and reduce their transmission is still understudied, especially for freshwater ecosystems. We investigated the influence of the common freshwater mussel (Anodonta anatina) on the transmission of a trematode (eye fluke, Diplostomum pseudospathaceum), which frequently infects fish in farms and natural habitats. In our experiments, mussels caused a significant decrease (P < 0·001) in the abundance of trematode free-living stages, from 6520 to 1770 cercariae L-1 on average (about 4-fold in 2 h). Individual clearance rates of mussels were 0·6‒3·7 L per hour (mean 1·9). These tests were followed by experimental infections of rainbow trout (Oncorhynchus mykiss) with different doses of D. pseudospathaceum cercariae in the presence or absence of mussels. Exposure of fish to cercariae in the presence of mussels significantly (P < 0·05) reduced the infection intensities in fish (by 30-40%) at all exposure doses. Our results indicate that freshwater bivalves can markedly reduce local cercariae densities and could be useful in mitigation of trematodoses harmful to fish farming.
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Parasitism, personality and cognition in fish. Behav Processes 2017; 141:205-219. [DOI: 10.1016/j.beproc.2016.11.012] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2016] [Revised: 11/20/2016] [Accepted: 11/23/2016] [Indexed: 12/27/2022]
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Positive density-dependent growth supports costs sharing hypothesis and population density sensing in a manipulative parasite. Parasitology 2017; 144:1511-1518. [PMID: 28653588 DOI: 10.1017/s0031182017001020] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Parasites manipulate their hosts' phenotype to increase their own fitness. Like any evolutionary adaptation, parasitic manipulations should be costly. Though it is difficult to measure costs of the manipulation directly, they can be evaluated using an indirect approach. For instance, theory suggests that as the parasite infrapopulation grows, the investment of individual parasites in host manipulation decreases, because of cost sharing. Another assumption is that in environments where manipulation does not pay off for the parasite, it can decrease its investment in the manipulation to save resources. We experimentally infected rainbow trout Oncorhynchus mykiss with the immature larvae of the trematode Diplostomum pseudospathaceum, to test these assumptions. Immature D. pseudospathaceum metacercariae are known for their ability to manipulate the behaviour of their host enhancing its anti-predator defenses to avoid concomitant predation. We found that the growth rate of individual parasites in rainbow trout increased with the infrapopulation size (positive density-dependence) suggesting cost sharing. Moreover, parasites adjusted their growth to the intensity of infection within the eye lens where they were localized suggesting population density sensing. Results of this study support the hypothesis that macroparasites can adjust their growth rate and manipulation investment according to cost sharing level and infrapopulation size.
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Consequences of eye fluke infection on anti-predator behaviours in invasive round gobies in Kalmar Sound. Parasitol Res 2017; 116:1653-1663. [PMID: 28386680 PMCID: PMC5429365 DOI: 10.1007/s00436-017-5439-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2017] [Accepted: 03/28/2017] [Indexed: 11/02/2022]
Abstract
Larvae of the eye fluke, Diplostomum, emerge from snails and infect fish by penetrating skin or gills, then move to the lens where they may impair the vision of the fish. For the fluke to reproduce, a bird must eat the infected fish, and it has been suggested that they therefore actively manipulate the fish's behaviour to increase the risk of predation. We found that round gobies Neogobius melanostomus, a species that was recently introduced to the Kalmar Sound of the Baltic Sea, had an eye fluke prevalence of 90-100%. We investigated how the infection related to behavioural variation in round gobies. Our results showed that the more intense the parasite-induced cataract, the weaker the host's response was to simulated avian attack. The eye flukes did not impair other potentially important anti-predator behaviours, such as shelter use, boldness and the preference for shade. Our results are in accordance with the suggestion that parasites induce changes in host behaviour that will facilitate transfer to their final host.
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26
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Gopko M, Mikheev VN, Taskinen J. Deterioration of basic components of the anti-predator behavior in fish harboring eye fluke larvae. Behav Ecol Sociobiol 2017. [DOI: 10.1007/s00265-017-2300-x] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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27
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Hafer N. Conflicts over host manipulation between different parasites and pathogens: Investigating the ecological and medical consequences. Bioessays 2016; 38:1027-37. [PMID: 27510821 PMCID: PMC5108444 DOI: 10.1002/bies.201600060] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
When parasites have different interests in regard to how their host should behave this can result in a conflict over host manipulation, i.e. parasite induced changes in host behaviour that enhance parasite fitness. Such a conflict can result in the alteration, or even complete suppression, of one parasite's host manipulation. Many parasites, and probably also symbionts and commensals, have the ability to manipulate the behaviour of their host. Non‐manipulating parasites should also have an interest in host behaviour. Given the frequency of multiple parasite infections in nature, potential conflicts of interest over host behaviour and manipulation may be common. This review summarizes the evidence on how parasites can alter other parasite's host manipulation. Host manipulation can have important ecological and medical consequences. I speculate on how a conflict over host manipulation could alter these consequences and potentially offer a new avenue of research to ameliorate harmful consequences of host manipulation.
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Affiliation(s)
- Nina Hafer
- Department of Evolutionary Ecology, Max-Planck-Institute for Evolutionary Biology, Plön, Germany.
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28
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Klemme I, Kortet R, Karvonen A. Parasite infection in a central sensory organ of fish does not affect host personality. Behav Ecol 2016. [DOI: 10.1093/beheco/arw080] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Hafer N, Milinski M. Inter- and intraspecific conflicts between parasites over host manipulation. Proc Biol Sci 2016; 283:rspb.2015.2870. [PMID: 26842574 PMCID: PMC4760176 DOI: 10.1098/rspb.2015.2870] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Host manipulation is a common strategy by which parasites alter the behaviour of their host to enhance their own fitness. In nature, hosts are usually infected by multiple parasites. This can result in a conflict over host manipulation. Studies of such a conflict in experimentally infected hosts are rare. The cestode Schistocephalus solidus (S) and the nematode Camallanus lacustris (C) use copepods as their first intermediate host. They need to grow for some time inside this host before they are infective and ready to be trophically transmitted to their subsequent fish host. Accordingly, not yet infective parasites manipulate to suppress predation. Infective ones manipulate to enhance predation. We experimentally infected laboratory-bred copepods in a manner that resulted in copepods harbouring (i) an infective C plus a not yet infective C or S, or (ii) an infective S plus a not yet infective C. An infective C completely sabotaged host manipulation by any not yet infective parasite. An infective S partially reduced host manipulation by a not yet infective C. We hence show experimentally that a parasite can reduce or even sabotage host manipulation exerted by a parasite from a different species.
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Affiliation(s)
- Nina Hafer
- Department of Evolutionary Ecology, Max Planck Institute for Evolutionary Biology, August-Thienemann-Straße 2, Plön, 24306, Germany
| | - Manfred Milinski
- Department of Evolutionary Ecology, Max Planck Institute for Evolutionary Biology, August-Thienemann-Straße 2, Plön, 24306, Germany
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