Quatrefoil light traps for free-swimming stages of cymothoid parasitic isopods and seasonal variation in their species compositions in the Seto Inland Sea, Japan

Fujita, Hiroki; Kawai, Kentaro; Deville, Diego; Umino, Tetsuya

doi:10.1016/j.ijppaw.2022.12.002

Cited by 6 publications

(4 citation statements)

References 30 publications

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“…Another interesting study showed that drought in stream fish communities can intensify parasitic copepod infestations (Medeiros and Maltchik, 1999). Furthermore, recent work suggests that the reproductive peaks of cymothoids in the free-swimming stage (called 'mancae') occurred in autumn (Fujita et al 2023), which could support our study where a more intense infestation of the prawns by juvenile cymothoid isopods during dry seasons. Another important aspect is the effect of low rainfall that can reduce river flow and habitat area during the dryest seasons and promote an increase in parasite transmission and encounter with prawns, probably the same as occurs with ectoparasite loads (Paull et al 2012;Shearer and Ezenwa, 2020).…”

Section: Discussionsupporting

confidence: 84%

“…Most cymothoids are parasites of marine, freshwater, and brackish teleosts (Smit et al 2014), but also may parasitise freshwater palaemonid prawns in tropical South American river systems (Wunderlich et al 2011;Andrade et al 2020). Adults of Telotha henselii are a well-known haematophagous ectoparasites cymothoid on fish, mostly found on skin and gills, and juvenile males use palaemonid prawns as optional intermediate hosts besides final hosts (Trilles and Öktener 2004;Wunderlich et al 2011;Andrade et al 2020;Anaguano-Yancha and Pilatasig, 2022;Fujita et al 2023). Therefore, the cymothoid-palaemonid system is a tractable model that could facilitate our understanding of how changes in the hydrological regime and host-related factors can influence host-ectoparasite interactions in freshwater ecosystems.…”

Section: Introductionmentioning

confidence: 99%

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Temporal changes in streamflow regime and host-related factors affect parasitism of freshwater prawn in Southeast Brazil

Wunderlich,

Mosna,

Pinheiro

2024

Preprint

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1. Understanding how changes in hydrological regime and intrinsic host factors drive parasite loads and dynamics remains a challenging issue in aquatic parasitology. Many host-parasite systems have shown that host-related factors can influence parasitism in freshwater systems. Temporal changes in the hydrological regime are also one key factor that could alter the streamflow and habitat area and indirectly affect the interactions between ectoparasite and host. However, there are still few studies on the combined effects of both streamflow regime and intrinsic host factors to investigate variations in parasite loads on stream ecosystems. 2. Here, we used a cymothoid-palaemonid prawn model to test whether host-related traits and the temporal changes in streamflow and area caused by the rainfall regime could influence ectoparasite loads in stream habitats. Prawns were collected seasonally over 4 years in a tropical stream in southeast Brazil. We also tested the hypothesis of whether the prawn body size covaries with cymothoid body size, and also whether this change between sex and seasons. 3. We found a strong relationship between the ectoparasite and host body sizes, which confirms Harrison’s rule of this host-ectoparasite system. Our best model showed an effect of host body size, host sex, and host molt stage, but not host age, on ectoparasite loads. Prawn females have higher ectoparasite loads than males, and there was a positive association with the ecdysis stage. Our model also predicts that decreased rainfall could increase parasitism in dry seasons by reducing the natural flow regime and habitat area in these tropical stream systems. 4. Our findings show that temporal variability in streamflow is a key environmental factor combined with host-related characteristics to drive the parasite dynamics of a cymothoid-prawn system in stream habitats.5. Identifying how the interactions between aquatic invertebrates and parasites respond to the variability in hydrological conditions can help to understand how infections and parasitism may affect the benthic invertebrates play in stream systems.

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Section: Discussionsupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Temporal changes in streamflow regime and host-related factors affect parasitism of freshwater prawn in Southeast Brazil

Wunderlich,

Mosna,

Pinheiro

2024

Preprint

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“…Light traps offer several advantages in the context of rice insect pest management (Qing et al, 2020). Firstly, they provide an efficient means of monitoring pest populations (Nielsen et al, 2013a), allowing farmers to gather valuable data on pest abundance (Prasad and Prabhakar, 2012), activity patterns (Kasap et al, 2009), and seasonal variations (Fujita et al, 2023). This information facilitates informed decision-making and the implementation of appropriate pest control measures.…”

Section: Introductionmentioning

confidence: 99%

Exploring the Utility of Light Traps for Early Detection and Management of Rice Insect Pests

Atta,

Sabir,

Gogi

et al. 2024

PUJZ

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The study was aimed to evaluate the utility of light traps for early detection and management of rice insect pests (for preserving crop yields, preventing economic losses, and ensuring food security) by analyzing the population dynamics of rice insect pests, focusing on six species: Scirpophaga innotata, Sesamia inferens, Scirpophaga incertulas, Cnaphalocrocis medinalis, Sogatella furcifera and Nilaparvata lugens. Population data spanning four years (2019-2022) were collected through the use of light traps revealed distinct peak populations for each species at different times. Scirpophaga innotata exhibited a consistent peak population in September, with a significant increase

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“…Cymothoids are mainly identified using the morphological characteristics of adult females. Thus, molecular analysis is almost the only way to identify manca, juvenile, and male specimens [8] and is often used for this purpose [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Morphological and Molecular Study of the Fish Parasitic Crustaceans Cymothoa indica and Mothocya collettei (Isopoda: Cymothoidae), with New Distribution Records

Fujita

2023

Diversity

Self Cite

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Cymothoidae are parasitic isopods that infest fishes inhabiting marine, brackish, and fresh-water environments. The systematics, distribution, and host specificity of cymothoids is often unknown. In this study, morphological observations and molecular analysis using the COI and 16S rRNA genes were conducted on a juvenile individual of Cymothoa indica infesting the wide-banded hardyhead silverside, Atherinomorus lacunosus, and an ovigerous female of Mothocya collettei infesting the hound needlefish, Tylosurus crocodilus, both collected from Okinawa Island, Japan. This is the first time that these two species of cymothoid have been collected in the Ryukyu Islands, and the juvenile C. indica in particular represents a new northern range limit for its species. That specimen was identified using molecular analysis and showed almost identical morphology to previously reported juveniles, but it differed in the numbers of robust setae on pereopods 6 and 7. The ovigerous female of M. collettei showed a high morphological similarity to M. collettei but had some morphological traits consistent with Mothocya affinis. DNA analysis indicated that these two nominal species of Mothocya are very closely related, and morphological and molecular studies using larger populations of both are needed.

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Quatrefoil light traps for free-swimming stages of cymothoid parasitic isopods and seasonal variation in their species compositions in the Seto Inland Sea, Japan

Cited by 6 publications

References 30 publications

Temporal changes in streamflow regime and host-related factors affect parasitism of freshwater prawn in Southeast Brazil

Temporal changes in streamflow regime and host-related factors affect parasitism of freshwater prawn in Southeast Brazil

Exploring the Utility of Light Traps for Early Detection and Management of Rice Insect Pests

Morphological and Molecular Study of the Fish Parasitic Crustaceans Cymothoa indica and Mothocya collettei (Isopoda: Cymothoidae), with New Distribution Records

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