Infestation of Palaemonetes argentinus (Crustacea: Palaemonidae) with Probopyrus cf. oviformis (Crustacea: Bopyridae): Observations on the habitat of cryptoniscus larvae

Schuldt, Miguel; Damborenea, María Cristina

doi:10.1016/0022-2011(88)90047-x

Cited by 11 publications

(14 citation statements)

References 10 publications

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“…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: Resultssupporting

confidence: 55%

“…One of these explanations is related to size, since the larger hosts are usually the more infested ones (Beck, 1979;Campos & Campos, 1989;Román-Contreras & Romero-Rodríguez, 2005); this would explain why females of T. floridanus were more infested by Bopyrinella thorii than males. Allen (1966), Anderson (1975a), Truesdale & Mermilliod (1977), Beck (1979), and Schuldt & Damborenea (1989) also have suggested that this supposed preference for a bigger size of the host is linked to a very short average period of the female's intermoult, and a longer life span. These conditions could represent reproductive advantages for the parasite, such as extended longevity, and hence the possibility of achieving a greater number of spawnings.…”

Section: Resultsmentioning

confidence: 92%

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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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Section: Resultssupporting

confidence: 55%

Section: Resultsmentioning

confidence: 92%

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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“…The similarity in the intermoult periods observed in males and females was consistent with the previous reports in the prawn M. borellii (collins, 1996). By contrast, Palaemonetes argentines Nobili, 1901 females had longer intermoult periods than males (schuldt & dAmboreneA, 1989), which is similar to other decapod species (hArtnoll, 1982). The differences in intermoult period between sexes were not observed for A. uruguayana in this study, but this may be related to the study seasonality, or to environmental conditions (e.g., temperature, salinity, and food availability) and the need for gonad maturation for the production of a new generation, as occurs in other species (sArdá, 1983;collins, 1996;renzulli & collins, 2000;VegA-VillAsAnte et al, 2006).…”

Section: Discussionsupporting

confidence: 58%

Shape and size variations of Aegla uruguayana (Anomura, Aeglidae) under laboratory conditions: A geometric morphometric approach to the growth

Diawol

Giri

Collins

2015

Iheringia, Sér. Zool.

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ABSTRACT.Crustacean growth studies typically use modal analysis rather than focusing on the growth of individuals. In the present work, we use geometric morphometrics to determine how organism shape and size varies during the life of the freshwater crab, Aegla uruguayana Schmitt, 1942. A total of 66 individuals from diverse life cycle stages were examined daily and each exuvia was recorded. Digital images of the dorsal region of the cephalothorax were obtained for each exuvia and were subsequently used to record landmark configurations. Moult increment and intermoult period were estimated for each crab. Differences in shape between crabs of different sizes (allometry) and sexes (sexual dimorphism; SD) were observed. Allometry was registered among specimens; however, SD was not statistically significant between crabs of a given size. The intermoult period increased as size increased, but the moult frequency was similar between the sexes. Regarding ontogeny, juveniles had short and blunt rostrum, robust forehead region, and narrow cephalothorax. Unlike juveniles crabs, adults presented a well-defined anterior and posterior cephalothorax region. The rostrum was long and stylised and the forehead narrow. Geometric morphometric methods were highly effective for the analysis of aeglid-individual-growth and avoided excessive handling of individuals through exuvia analysis. KEYWORDS.Crustacea, cephalothorax, ontogeny, intermoult, morphometrics. RESUMEN. Variaciones de forma y tamaño deAegla uruguayana (Anomura, Aeglidae): Una aproximación desde la morfometría geométrica al crecimiento. Los estudios de crecimiento en crustáceos típicamente utilizan análisis modal en lugar de focalizarse en el crecimiento individual de los organismos. En el presente trabajo, utilizamos morfometría geométrica para determinar cómo varia la forma y el tamaño a lo largo de la vida del cangrejo de agua dulce, Aegla uruguayana Schmitt, 1942. Un total de 66 individuos, en diferentes etapas del ciclo de vida, se examinaron diariamente, registrándose la presencia de exuvias. Imágenes digitales de cada muda fueron obtenidas de la región dorsal del cefalotórax y se utilizaron para registrar las configuraciones de landmarks. El incremento por muda y el período de intermuda se estimaron para cada cangrejo. Diferencias de forma entre tamaños (alometría) y sexos (dimorfismo sexual; SD) se observaron. Se registró la presencia de alometría entre los especímenes; sin embargo, el SD no fue estadísticamente significativo respecto del tamaño. El período intermuda aumentó de manera directamente proporcional al tamaño, pero la frecuencia de muda fue similar entre los sexos. Durante la ontogenia, los juveniles presentaron rostro corto y romo, frente robusta, y ancho del cefalotórax estrecho. Los adultos presentaron la región anterior y posterior del cefalotórax bien definido en relación con los juveniles. El rostro fue largo y estilizado y la frente estrecha. Los métodos de morfometría geométrica fueron muy efectivos para el análisis del crecimiento individual e...

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“…Former evidences indicate that few P. argentinus adult females reach the breeding season of their second year of life (RODRIGUEZ CAPÍTULO, 1992). In populations of the same species but from other regions of Argentina, the recruitment of juveniles is restricted to January-March (SCHULDT & DAMBORENEA, 1989;SPIVAK, 1997). RODRIGUEZ CAPÍTULO & FREYRE (1989) have also described the existence of three cohorts corresponding to the reproductive periods of October, December, and January.…”

Section: Discussionmentioning

confidence: 99%

“…Several studies have been published on this species concerning larval development (MENU MARQUE, 1973), growth (RODRIGUEZ CAPÍTULO & FREYRE, 1989), reproductive biology (GOLDSTEIN & LAURÍA DE CIDRE, 1974;SCHULDT & DAMBORENEA, 1989), survival and fecundity (RODRIGUEZ CAPÍTULO, 1992), bioecological aspects (DONATTI, 1986), and morphology (SOUSA et al, 1997;SOUSA & PETRIELLA, 2000, 2001DÍAZ et al, 1998); however the molt cycle of natural populations had never been investigated.…”

Section: Introductionmentioning

confidence: 99%

Molt cycle of the natural population of Palaemonetes argentinus (Crustacea, Palaemonidae) from Los Padres Lagoon (Buenos Aires, Argentina)

Felix

Petriella

2003

Iheringia, Sér. Zool.

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The molt cycle of the natural population of Palaemonetes argentinus Nobili, 1901 from Los Padres Lagoon, Buenos Aires, Argentina, was studied in relation to age, sex, and environmental factors. A total of 1645 individuals (740 females, 539 males, and 366 juveniles) were collected and analyzed between December 1995 and December 1996. The results indicate that the sex ratio (males:females) remains around 1:1.4 throughout most of the year. The reproductive period extends from September until February (spring and summer), with maximum sexual activity in October and November. Two cohorts originated in the spring and in the summer were differentiated. Ovigerous females arrest their molt cycle during the intermolt period to restart it after oviposition. The duration of the intermolt period does not differ between adults and juveniles. Since the percentage of premolt individuals represents 60% of the total cycle, it was classified as a diecdysic cycle. Within the studied range of water temperatures, the observed variations in the span of the different stages, indicate that this factor does not alter the molt frequency. Like in the rest of decapods, the intermolt duration of P. argentinus is modified by ovarian maturation.

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Infestation of Palaemonetes argentinus (Crustacea: Palaemonidae) with Probopyrus cf. oviformis (Crustacea: Bopyridae): Observations on the habitat of cryptoniscus larvae

Cited by 11 publications

References 10 publications

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

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

Shape and size variations of Aegla uruguayana (Anomura, Aeglidae) under laboratory conditions: A geometric morphometric approach to the growth

Molt cycle of the natural population of Palaemonetes argentinus (Crustacea, Palaemonidae) from Los Padres Lagoon (Buenos Aires, Argentina)

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