Effects of River Hydrology and Physicochemistry on Anchovy Abundance and Cymothoid Isopod Parasitism

MacNeill, Bryan N.; Lajeunesse, Marc J.

doi:10.1645/19-63

Cited by 3 publications

(2 citation statements)

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“…The high prevalence of parasites detected in only one of the sampled habitats is likely associated with the highest abundance of the main host and alternative hosts (Table S2), and the distinctive environmental characteristics including a shallower depth and slow circular water movements (Figure S3). Host densities or aggregations (Bagge et al., 2004; Welicky & Sikkel, 2014) and flow rate (MacNeill & Lajeunesse, 2019) have been described as important factors in determining parasite population characteristics, and shallower depths may be important if specific settlement strategies depend on the proximity of fish a substrate that is used by mancae (Thatcher, 2000). The flow rate is associated with changes in habitat stability and complexity that both link to and combine with the availability of hosts to determine the opportunity for parasitism.…”

Section: Discussionmentioning

confidence: 99%

“…These peculiar observations prompted us to investigate possible factors that might maintain this highly localized distribution and host preference. Cymothoid abundances in estuarine and marine environments are generally associated with salinity, but this may show correlation with other factors (Sikkel & Welicky, 2019) including flow rates that moderate habitat stability and complexity, thus influencing the opportunities for parasitism (MacNeill & Lajeunesse, 2019) and anthropogenic impacts (Sala‐Bonzano et al., 2012). It is also possible that temporal changes in host population or aggregation sizes (Welicky & Sikkel, 2014) or predation of the parasites (Narvaez et al., 2015) may impact local cymothoid abundances.…”

Section: Introductionmentioning

confidence: 99%

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Habitat and host associations of the fish‐burrowing parasite Artystone minima (Cymothoidae: Isopoda) in eastern Amazonia

et al. 2020

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Cymothoid fish parasites settle on hosts in ways that may impact fish health and energetics. High abundances of Artystone minima observed in Nannostomus beckfordi from the Jeju River in eastern Amazonia were investigated to answer the following questions: (a) What factors are associated with the high prevalence at this locality?; (b) Is high abundance associated with co‐infestation of alternative hosts?; and (c) Is parasite presence associated with host species growth and/or reproduction? Fish assemblages were sampled quarterly (August 2017–May 2018) from five habitats along with environmental data. Parasitic indices were calculated, and parasite presence used to evaluate differences in growth of hosts using analysis of covariance considering host sex and sampling season (wet vs. dry). Parasites were only abundant in one of the habitats, a large, shallow backwater bay with macrophytes. Abiotic environmental factors (flow and depth) likely impact parasite transmission and are, therefore, particularly important in producing these local patterns. Two secondary hosts, Hyphessobrycon cf. rosaceus and Moenkhausia collettii, were found in the wet season. Based on host biology compared to other fish in the habitat, parasite infestation is inferred to be depth associated and long‐term infestation is apparently limited in alternative hosts. Parasite presence was significantly associated with reduced weight (standardized for length) of female Nannostomus beckfordi in the wet season. Furthermore, ovaries of non‐parasitized females from the wet season presented a range of maturation stages, while parasitized females were all immature, indicating a significant association of parasites with host reproductive capacity. Abstract in Portuguese is available with online material

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Habitat and host associations of the fish‐burrowing parasite Artystone minima (Cymothoidae: Isopoda) in eastern Amazonia

et al. 2020

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Morphological and molecular characterisation of Cymothoa eremita (Brunnich, 1783) (Isopoda: Cymothoidae) from the South China Sea

Martin,

Yusoff,

Hashim

et al. 2024

Regional Studies in Marine Science

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Linguistic system and sociolinguistic environment as competing factors in linguistic variation: A typological approach

Sinnemäki

2020

Journal of Historical Sociolinguistics

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This paper brings together typological and sociolinguistic approaches to language variation. Its main aim is to evaluate the relative effect of language internal and external factors on the number of cases in the world’s languages. I model word order as a language internal predictor; it is well-known that, for instance, languages with verb-final word order (that is, languages in which both nominal arguments precede the main lexical verb) tend to develop complex case systems more often than languages with SVO word order do. I model population size and the proportion of second language speakers in the speech community as sociolinguistic predictors; these factors have been suggested recently to influence the distribution of the number of cases in the world’s languages. Modelling the data with generalized linear mixed effects modelling suggests an interaction between the number of cases, word order, and the proportion of second language speakers on the one hand, and between the number of cases, word order, and population size, on the other. This kind of complex interactions have not been previously reported in typological research wherefore they call for more complex explanations than previously suggested for cross-linguistic variation.

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Effects of River Hydrology and Physicochemistry on Anchovy Abundance and Cymothoid Isopod Parasitism

Cited by 3 publications

References 48 publications

Habitat and host associations of the fish‐burrowing parasite Artystone minima (Cymothoidae: Isopoda) in eastern Amazonia

Habitat and host associations of the fish‐burrowing parasite Artystone minima (Cymothoidae: Isopoda) in eastern Amazonia

Morphological and molecular characterisation of Cymothoa eremita (Brunnich, 1783) (Isopoda: Cymothoidae) from the South China Sea

Linguistic system and sociolinguistic environment as competing factors in linguistic variation: A typological approach

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