Efecto del parasitismo del isópodo bopírido Ionella agassizi (Isopoda: Epicaridea) (Bornnier, 1900) sobre la fisiología nutricional del nape Neotrypaea uncinata (M. Edwards, 1837) (Decapoda: Thalassinidea)

A B S T R A C TThe population structure and energetic burden of bopyrid isopod parasite Orthione griffenis on the eastern Pacific mud shrimp Upogebia pugettensis are estimated from size and weight relationships between parasite and host. U. pugettensis weight loss increases with O. griffenis weight but the high variance in the relation indicates that direct weight comparisons are insufficient to reveal most of the host-parasite energetic interactions. Environment, reproductive development, age, molt stage and the feeding histories of the hosts and parasites, not apparent from weight ratio comparisons, are likely to be important factors in their interaction. The high prevalence of O. griffenis among U. pugettensis and positive correlation between host weight loss and parasite weight nevertheless, indicate large impacts of these parasites on mud shrimp populations are occurring with corresponding effects on estuarine dynamics in Pacific Northwest estuaries.

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“…5). Other bopyrid isopods have more constant host weight losses per gram of parasite (Anderson, 1975;Astete-Espinoza and Caceres, 2000).…”

Section: Discussionmentioning

confidence: 99%

Population Structure and Energetics of the Bopyrid Isopod Parasite Orthione Griffenis in Mud Shrimp Upogebia Pugettensis

Smith¹,

Dumbauld²,

Chapman³

2008

Journal of Crustacean Biology

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“…However, the size ranges of T. floridanus recorded in the present study (0.7-2.85 mm and 0.9-2.32 mm POCL for females and males, respectively) were larger than those reported by these studies. There are some published records of a higher incidence of infestation among male hosts, but there are other records where the parasites did not present a preference for either sex of the host (Van Wyk, 1982;Schuldt & RodriguesCapitulo, 1987;Campos & Campos, 1989;Astete-Espinoza & Caceres, 2000;Masunari et al, 2000). In contrast, there have also been reports of a higher prevalence of infestation on females than on male hosts (Allen, 1966;Szidat, 1977;Truesdale & Mermilliod, 1977;Beck, 1979;Guzmán & Román-Contreras, 1983;Jay, 1989;Schuldt & Damborenea, 1989;Román-Contreras & Romero-Rodríguez, 2005), with which the present study agrees.…”

Section: Resultsmentioning

confidence: 94%

Changes in Secondary Sexual Characters of Males of Thor Floridanus (Decapoda, Hippolytidae), Infested by Bopyrinella Thorii (Isopoda, Bopyridae)

Román-Contreras

Romero-Rodríguez

2011

Crustac

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This study describes changes in the secondary sexual characters of Thor floridanus Kingsley, 1878 males, caused by the isopod Bopyrinella thorii (Richardson, 1904). Of 380 specimens of T. floridanus examined, the females were more often infested (n = 313) than the males (n = 41), and had a wider size range (0.7-2.85 mm POCL) compared to the males (0.9-2.32 mm POCL); no ovigerous females of T. floridanus were found. In 25 males the appendix masculina was reduced in size, the endopod of the second pleopod was barely ornamented, and the flexor margin of the propod of the third pereiopod was similar to that of the female of the species; all those males were classified as "feminized". Those individuals were infested mainly by pairs of mature parasites, and 75% of the "primary" males carried cryptoniscus larvae, suggesting that the "feminization" of the males is caused by the parasite, as a result of the sexual development of hosts and parasites. RESUMENEl presente trabajo describe los cambios de los caracteres sexuales secundarios de Thor floridanus Kingsley, 1878, machos, ocasionadas por el isópodo Bopyrinella thorii (Richardson, 1904). De 380 especimenes de T. floridanus examinados las hembras fueron más infestadas (n = 313) que los machos (n = 41) y presentaron un intervalo de tallas más amplio (0,7-2,85 mm) de longitud cefalotorácica postorbital (LCPO) que los machos (0,9-2,32 mm LCPO); ninguna hembra de T. floridanus se encontró ovígera. En 25 machos el apéndice masculino estuvo reducido en tamaño, el endópodo del segundo pleópodo se observó escasamente ornamentado y el margen flexor del propodio del tercer pereiópodo fue similar al de las hembras de la especie, por lo que fueron clasificados como machos "feminizados". Estos individuos estuvieron infestados principalmente por parejas de parásitos maduros; mientras que el 75% de los machos "primarios" que no presentaron modificaciones en los caracteres sexuales secundarios portaban larvas cryptoniscus; ello sugiere que la "feminización" de los machos es causada por el parásito, a la vez que huésped y parásito se desarrollan y alcanzan la madurez sexual. 1 )

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“…Parasitic copepods may eat portions of fish larvae such as tissues or mucus; this ingestion may be significant if we consider that parasitic copepods are relatively large in fish larvae. If so, fish larvae maintain the parasites through their own nutritional budget (Anderson and Dale 1981;Astete-Espinoza and Cáceres 2000). (2) The immune response of the hosts.…”

Section: Discussionmentioning

confidence: 99%

Parasites of fish larvae: do they follow metabolic energetic laws?

et al. 2015

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Eumetazoan parasites in fish larvae normally exhibit large body sizes relative to their hosts. This observation raises a question about the potential effects that parasites might have on small fish. We indirectly evaluated this question using energetic metabolic laws based on body volume and the parasite densities. We compared the biovolume as well as the numeric and volumetric densities of parasites over the host body volume of larval and juvenile-adult fish and the average of these parasitological descriptors for castrator parasites and the parasites found in the fish studied here. We collected 5266 fish larvae using nearshore zooplankton sampling and 1556 juveniles and adult fish from intertidal rocky pools in central Chile. We considered only the parasitized hosts: 482 fish larvae and 629 juvenile-adult fish. We obtained 31 fish species; 14 species were in both plankton and intertidal zones. Fish larvae exhibited a significantly smaller biovolume but larger numeric and volumetric densities of parasites than juvenile-adult fish. Therefore, fish larvae showed a large proportion of parasite biovolume per unit of body host (cm(3)). However, the general scaling of parasitological descriptors and host body volume were similar between larvae and juvenile-adult fish. The ratio between the biovolume of parasites and the host body volume in fish larvae was similar to the proportion observed in castrator parasites. Furthermore, the ratios were different from those of juvenile-adult fish, which suggests that the presence of parasites implies a high energetic cost for fish larvae that would diminish the fitness of these small hosts.

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Efecto del parasitismo del isópodo bopírido Ionella agassizi (Isopoda: Epicaridea) (Bornnier, 1900) sobre la fisiología nutricional del nape Neotrypaea uncinata (M. Edwards, 1837) (Decapoda: Thalassinidea)

Cited by 15 publications

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Population Structure and Energetics of the Bopyrid Isopod Parasite Orthione Griffenis in Mud Shrimp Upogebia Pugettensis

Population Structure and Energetics of the Bopyrid Isopod Parasite Orthione Griffenis in Mud Shrimp Upogebia Pugettensis

Changes in Secondary Sexual Characters of Males of Thor Floridanus (Decapoda, Hippolytidae), Infested by Bopyrinella Thorii (Isopoda, Bopyridae)

Parasites of fish larvae: do they follow metabolic energetic laws?

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