Record of parasitic oomycetes on neotropical copepods in aquatic environments of Northwestern Patagonia (Argentina)

Roberto Daniel Garcia; Fabián Gastón Jara; Mónica Mirta Steciow

doi:10.1590/S2179-975X0719

Short Research Note

Record of parasitic oomycetes on neotropical copepods in aquatic environments of Northwestern Patagonia (Argentina)

Registro de oomicetos parasíticos em copépodes neotropicais em ambientes aquáticos da Patagônia Noroeste (Argentina)

Roberto Daniel Garcia; Fabián Gastón Jara; Mónica Mirta Steciow

http://dx.doi.org/10.1590/S2179-975X0719 Acta Limnol. Bras. (Online), vol.32, e16, 2020

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Abstract

Abstract:: Aim: Oomycetes are one of the most widespread and destructive parasitic groups in the world. The first infection of oomycetes on copepod Parabroteas sarsi Daday 1901 was recently recorded in America. Oomycetes infection on this species makes their eggs unviable and could differentially affect the survival of females. The aim of this study was to track the incidence of oomycetes in two populations of P. sarsi.

Methods: Two Patagonian ponds were monitored during spring-summer of 2014-2018, measuring environmental variables and the prevalence of oomycete infections on P. sarsi populations. Taxonomic determination of the oomycetes was performed in laboratory. Sex ratios also were recorded in each survey.

Results: The presence of Aphanomyces ovidestruens Gicklhorn 1923 and Pythium flevoense Van der Plaats-Niterink 1972 was detected in females of P. sarsi in both ponds. We observed a decrease in the parasite prevalence over time, from ~25% (assessed on the total number of adults) to almost disappear completely. Besides, a lower proportion of females than males were observed in samples with high prevalence of parasitism. No temperature differences were found during the sampling years and the monthly temperatures between the maximum and minimum prevalences were similar.

Conclusions: Our study presents a new record of oomycetes parasitizing copepods in America. Temperature can play a key role in the dynamics of parasite species, but in our study this variable not affected the incidence of the infection. However, other variables could be affect the pattern of the infection such as the presence of predators of oomycetes spores (cladocerans). The lower females proportion when the infection was higher, could support the idea of differential sex/mortality induced by the infection. Recording and identification of parasites is a critical starting point for wildlife management, which will provide an early warning to prevent the spread of harmful parasites such as oomycetes.

Keywords

zooplankton, parasitism, calanoids, wetlands, sex ratios

Resumo

Resumo:: Objetivo: Os oomicetos são um dos grupos parasitários mais difundidos e destrutivos do mundo. A primeira infecção de oomicetos no copépode Parabroteas sarsi Daday 1901 foi recentemente registrada na América. A infecção por Oomycetes nesta espécie torna os seus ovos inviáveis e pode afetar diferentemente a sobrevivência das fêmeas. O objetivo deste estudo foi rastrear a incidência de oomicetos em duas populações de P. sarsi.

Métodos: Duas poças na patagônia foram monitoradas durante a primavera-verão de 2014-2018, medindo variáveis ambientais e a prevalência de infecções por oomicetos em populações de P. sarsi. A determinação taxonômica dos oomicetos foi realizada em laboratório. As proporções de sexo também foram registradas em cada pesquisa.

Resultados: A presença de Aphanomyces ovidestruens Gicklhorn 1923 e Pythium flevoense Van der Plaats-Niterink 1972 foi detectada em fêmeas de P. sarsi em ambas as poças. Observamos uma diminuição na prevalência de parasita ao longo do tempo, com uma redução que foi de aproximadamente 25% (considerando o número total de adultos) até próximo de desaparecer completamente. Além disso, uma proporção menor de fêmeas do que de machos foi observada em amostras com alta incidência de parasitismo. Não foram encontradas diferenças de temperatura durante os anos de amostragem e as temperaturas mensais entre as prevalências máxima e mínima foram semelhantes.

Conclusão: Nosso estudo apresenta um novo registro de parasitismo por oomicetos em copépodes na América. A temperatura pode desempenhar um papel fundamental na dinâmica das espécies parasitárias, mas em nosso estudo esta variável não afetou a incidência da infecção. No entanto, outras variáveis podem afetar o padrão da infecção, como a presença de predadores de esporos de oomicetos (cladóceros). A menor proporção de fêmeas quando a infecção foi maior indicam mortalidade diferencial por sexo induzida pela infecção. O registo e identificação de parasitas é um ponto de partida crítico para a gestão da vida selvagem, o que proporcionará um alerta precoce para prevenir a propagação de parasitas nocivos como os oomicetos.

Palavras-chave

zooplâncton, parasitismo, calanóides, zonas húmidas, proporção de sexos

Referencias

BURNS, C.W. Fungal parasitism in a copepod population: the effects of Aphanomyces on the population dynamics of Boeckella dilatata Sars. Journal of Plankton Research, 1985a, 7(2), 201-205. http://dx.doi.org/10.1093/plankt/7.2.201.

BURNS, C.W. Fungal parasitism in a freshwater copepod: components of the interaction between Aphanomyces and Boeckella. Journal of Invertebrate Pathology, 1985b, 46(1), 5-10. http://dx.doi.org/10.1016/0022-2011(85)90123-5.

CUASSOLO, F., NAVARRO, M.B., BALSEIRO, E. and MODENUTTI, B. Effect of light on particulate and dissolved organic matter production of native and exotic macrophyte species in Patagonia. Hydrobiologia, 2016, 766(1), 29-42. http://dx.doi.org/10.1007/s10750-015-2434-7.

DICK, M.W. Straminipilous fungi. Systematics of the Peronosporomycetes including account of the marine straminipilous protists, the plasmodiophorids and similar organisms. Dordrecht: Kluwer Academic Publishers, 2001.

GARCIA, P.E. and DIÉGUEZ, M.C. Vulnerability of Patagonian planktonic copepods to fluctuations in temperature and UVR. Crustaceana, 2014, 87(3), 291-304. http://dx.doi.org/10.1163/15685403-00003288.

GARCIA, R.D., GARCIA, P.E. and REISSIG, M. Sexual size dimorphism in calanoid copepods (Centropagidae) from Patagonia (Argentina). New Zealand Journal of Marine and Freshwater Research, 2013a, 47(4), 504-514. http://dx.doi.org/10.1080/00288330.2013.802699.

GARCIA, R.D., REISSIG, M. and DIÉGUEZ, M.C. Parabroteas: El pequeño gigante de la Patagonia. Difundiendo Saberes Desde la Patagonia, 2013b, 10(15), 2-9.

GARCIA, R.D., JARA, F.G., STECIOW, M.M. and REISSIG, M. Oomycete parasites in freshwater copepods of Patagonia: effects on survival and recruitment. Diseases of Aquatic Organisms, 2018, 129(2), 123-134. http://dx.doi.org/10.3354/dao03240. PMid:29972373.

HUNTLEY, M.E. and LOPEZ, M.D.G. Temperature-dependent production of marine copepods: a global synthesis. American Naturalist, 1992, 140(2), 201-242. http://dx.doi.org/10.1086/285410. PMid:19426057.

JOHNSON, T.W., SEYMOUR, R.L. and PADGETT, D.E. Biology and systematics of the Saprolegniaceae. Wilmington: University of North Carolina at Wilmington, 2002 [viewed 26 may 2020]. Available from: http://dl.uncw.edu/digilib/Biology/Fungi/Taxonomy%20and%20Systematics/Padgett%20Book/Preface.pdf

KIØRBOE, T. Sex, sex-ratios, and the dynamics of pelagic copepod populations. Oecologia, 2006, 148(1), 40-50. http://dx.doi.org/10.1007/s00442-005-0346-3. PMid:16425044.

LI, C., LUO, X., HUANG, X. and GU, B. Influences of temperature on development and survival, reproduction and growth of a calanoid copepod (Pseudodiaptomus dubia). TheScientificWorldJournal, 2009, 9, 866-879. http://dx.doi.org/10.1100/tsw.2009.96. PMid:19734960.

MITCHELL, S.E., ROGERS, E.S., LITTLE, T.J. and READ, A.F. Host−parasite and genotype-by-environment interactions: temperature modifies potential for selection by a sterilizing pathogen. Evolution; International Journal of Organic Evolution, 2005, 59(1), 70-80. http://dx.doi.org/10.1111/j.0014-3820.2005.tb00895.x. PMid:15792228.

PEROTTI, M.G., DIÉGUEZ, M.C. and JARA, F.G. Estado del conocimiento de humedales del norte patagónico (Argentina): aspectos relevantes e importancia para la conservación de la biodiversidad regional. Revista Chilena de Historia Natural, 2005, 78(4), 723-737. http://dx.doi.org/10.4067/S0716-078X2005000400011.

PHILLIPS, A.J., ANDERSON, V.L., ROBERTSON, E.J., SECOMBES, C.J. and VAN WEST, P. New insights into animal pathogenic oomycetes. Trends in Microbiology, 2008, 16(1), 13-19. http://dx.doi.org/10.1016/j.tim.2007.10.013. PMid:18096392.

REISSIG, M., MODENUTTI, B., BALSEIRO, E. and QUEIMALINOS, C. The role of the predaceous copepod Parabroteas sarsi in the pelagic food web of a large deep Andean lake. Hydrobiologia, 2004, 524(1), 67-77. http://dx.doi.org/10.1023/B:HYDR.0000036120.33105.05.

REDFIELD, G. and VINCENT, W. Stages of infection and ecological effects of a fungal epidemic on the eggs of a limnetic copepod. Freshwater Biology, 1979, 9(6), 503-510. http://dx.doi.org/10.1111/j.1365-2427.1979.tb01534.x.

ROSSETTI, G. Fungal parasitism in freshwater calanoid population: consequences and possible mechanisms involved in the infection process. Hydrobiologia, 2005, 548(1), 167-176. http://dx.doi.org/10.1007/s10750-005-4168-4.

STECIOW, M.M. Estudio cuantitativo de los oomycetes del río Santiago y afluentes (Buenos Aires, Argentina). Natura Neotropicalis, 2005, 2(27), 119-126. http://dx.doi.org/10.14409/natura.v2i27.3686.

TOMPKINS, D.M., CARVER, S., JONES, M.E., KRKOŠEK, M. and SKERRATT, L.F. Emerging infectious diseases of wildlife: a critical perspective. Trends in Parasitology, 2015, 31(4), 149-159. http://dx.doi.org/10.1016/j.pt.2015.01.007. PMid:25709109.

VALOIS, A.E. The distribution, phylogeny, and ecology of brood parasitism in calanoid copepods [PhD dissertation]. 2015, Dunedin: University of Otago.

VALOIS, A.E. and BURNS, C.W. Parasites as prey: Daphnia reduce transmission success of an oomycete brood parasite in the calanoid copepod Boeckella. Journal of Plankton Research, 2016, 38(5), 1281-1288. http://dx.doi.org/10.1093/plankt/fbw055.

VALOIS, A.E. and POULIN, R. Global drivers of parasitism in freshwater plankton communities. Limnology and Oceanography, 2015, 60(5), 1707-1718. http://dx.doi.org/10.1002/lno.10127.

Submitted date:
28/01/2019

Accepted date:
26/05/2020

Publication date:
03/08/2020

Record of parasitic oomycetes on neotropical copepods in aquatic environments of Northwestern Patagonia (Argentina)

Registro de oomicetos parasíticos em copépodes neotropicais em ambientes aquáticos da Patagônia Noroeste (Argentina)

Roberto Daniel Garcia; Fabián Gastón Jara; Mónica Mirta Steciow

Abstract

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