Observations on the Natural History and Experiments on the Reproductive Strategy of Hargeria rapax (Tanaidacea)

Modlin, Richard F.; Harris, Patricia A.

doi:10.2307/1548589

Cited by 25 publications

(21 citation statements)

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“…The sex-ratio of K. schubartii in the present study was female-skewed during all months, in agreement with studies of the same species from other sites along the Brazilian coast (Almeida, 1994;Leite et al, 2003), and on other tanaid species (Masunari & Sieg, 1980;Modlin & Harris, 1989;Kneib, 1992). Predation pressure on males during the reproductive period may decrease their proportion in the population (Leite et al, 2003).…”

Section: Study Areasupporting

confidence: 91%

“…Total finite mortality of intramarsupial stages was 14.4%. DISCUSSION Fluctuations in population density are frequent in peracarids, high densities indicating periods of intense reproduction and recruitment (Modlin & Harris, 1989;Kneib, 1992;Cardoso & Veloso, 1996;Maranhão et al, 2001;Schmidt et al, 2002;Gamito & Marques, 2003;Leite et al, 2003). At Itaipu Lagoon, changes in density were due to oscillations in larval stages and juveniles.…”

Section: Study Areamentioning

confidence: 96%

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Population Biology and Reproduction of Kalliapseudes Schubartii Mañé-Garzón, 1949 (Peracarida, Tanaidacea) in a Tropical Coastal Lagoon, Itaipu, Southeastern Brazil

Soares-Gomes¹,

Pennafirme²

2009

Crustac

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A population of the tanaidacean, Kalliapseudes schubartii Mañé-Garzón, 1949 was sampled monthly in order to study its life cycle in a southeastern Brazilian tropical lagoon. The species' density changed seasonally, increasing in the beginning of the wet season and presenting peaks following precipitation peaks in other periods. Density changed due to oscillations in numbers of larval stages and juveniles. Females were larger than males, and the size at onset of sexual maturity of females was 5.9 mm. The sex-ratio was female-skewed during all months, in accordance with studies of the same species at other sites along the Brazilian coast and on other species of tanaids. Ovigerous females and other developmental stages were observed in all samples. Peaks in the frequencies of larval stages and juveniles were followed by peaks in ovigerous female frequency. Comparisons of populations of K. schubartii at different sites along the Brazilian coast showed an intraspecific difference in their life cycles according to a latitudinal gradient, with longer reproductive activity occurring in the tropics. RÉSUMÉ[Les études de biologie des populations des espèces-proies fournissent des informations utiles pour la gestion de la ressource et aident à prévoir les changements à venir concernant les espèces exploitées commercialement.] Une population de tanaidacés Kalliapseudes schubartii Mañé-Garzón, 1949 a été échantillonnée mensuellement dans une lagune tropicale du sud-est du Brésil afin d'étudier son cycle de vie. Les résultats montrent une variation saisonnière de la densité, celle-ci augmentant au début de la saison des pluies et présentant des pics à la suite des précipitations pour les autres périodes de l'année. Les densités mesurées varient avec le changement de stade larvaire à juvénile. Les femelles sont plus grandes que les individus mâles, la taille de celles-ci au début de la maturité sexuelle est de 5,9 mm. Le «sex-ratio» apparaît déséquilibré pour chaque mois avec une prédominance des individus femelles, ce qui concorde avec des études réalisées chez la même 3 )

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Section: Study Areasupporting

confidence: 91%

Section: Study Areamentioning

confidence: 96%

Population Biology and Reproduction of Kalliapseudes Schubartii Mañé-Garzón, 1949 (Peracarida, Tanaidacea) in a Tropical Coastal Lagoon, Itaipu, Southeastern Brazil

Soares-Gomes¹,

Pennafirme²

2009

Crustac

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“…In the few detailed studies that have been carried out on this fa mily (Buckle-Ramirez 1965;Ishimaru 1985), it was demonstrated that when the male to female ratio falls, females may molt into males of different morphological forms, depending on the life stage of the female. Males of some species have been recorded as having up to four different morphs (Buckle-Ramirez 1965;Lang 1973;Sieg 1978Sieg , 1983Highsmith 1982Highsmith , 1983Ishimaru 1985;Stoner 1986;Modlin & Harris 1989). Apart from sexual polymorphism, ontogenetic variation amongst species in the genus com plicates identification.…”

Section: Introductionmentioning

confidence: 99%

In the footsteps of Henrik Nikolaj Krøyer: the rediscovery and redescription of Leptochelia savignyi (Krøyer, 1842) sensu stricto (Crustacea: Tanaidacea: Leptocheliidae)

Bamber¹

2010

Proceedings of the Biological Society of Washington

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“…In the lower latitudes where salinity appears to influence cumacean dynammics (Modlin & Dardeau, 1987;Varga, 1989), this environmental factor may, like the influence of temperature in higher latitudes, also have a significant affect on reproductive cycles. Salinities were lower during the study year than in the previous and following years (Modlin & Harris, 1989).…”

Section: Discussionmentioning

confidence: 56%

“…Sand Island. The associated benthic fauna in the study areas is rich in polychaetes, crustaceans and molluscs (Vittor, 1979;Heard, 1982;Modlin, 1982;Modlin & Harris, 1989). Nekton of the area has been cataloged by Swingle (1971) and Shipp (1988).…”

Section: Description Of Study Areamentioning

confidence: 99%

Population Structure, Distribution, Life Cycle and Reproductive Strategy of Spilocuma watlingi Omholt and Heard, 1979 and S. salomani Watling, 1977 (Cumacea: Bodotriidae) from Coastal Waters of the Gulf of Mexico

Modlin

1992

NEGS

Self Cite

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Populations of S. watlingi and S. salomani in Gulf of Mexico coastal waters south of Dauphin Island, Alabama were systematically sampled from July 1984 to June 1985. Spiloouma watlingi inhabited protected estuarine water of Pelican Bay, whileS. salomani was only found seaward of the barrier bar-island system that separated Pelican Bay from the Gulf of Mexico. Both species were present throughout the year. Spi/oouma watlingi was most abundant in autumn and winter and had a single winter reproductive peak, but fecundity was low. Abundance and reproductive peaks for S. salomani were not determined because samples were not collected during the winter months and, when collected, too few specimens were obtained. Mature males in both populations were the smallest individuals. Intermediate in size between mature males and females was a non-sexually dimorphic stage. Preparatory and gravid females were the largest individuals and their numbers were at least twice that of males. A protandrous reproductive strategy Is proposed where small mature males metamorphose Into intersex stages which then become females.

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Observations on the Natural History and Experiments on the Reproductive Strategy of Hargeria rapax (Tanaidacea)

Cited by 25 publications

References 0 publications

Population Biology and Reproduction of Kalliapseudes Schubartii Mañé-Garzón, 1949 (Peracarida, Tanaidacea) in a Tropical Coastal Lagoon, Itaipu, Southeastern Brazil

Population Biology and Reproduction of Kalliapseudes Schubartii Mañé-Garzón, 1949 (Peracarida, Tanaidacea) in a Tropical Coastal Lagoon, Itaipu, Southeastern Brazil

In the footsteps of Henrik Nikolaj Krøyer: the rediscovery and redescription of Leptochelia savignyi (Krøyer, 1842) sensu stricto (Crustacea: Tanaidacea: Leptocheliidae)

Population Structure, Distribution, Life Cycle and Reproductive Strategy of Spilocuma watlingi Omholt and Heard, 1979 and S. salomani Watling, 1977 (Cumacea: Bodotriidae) from Coastal Waters of the Gulf of Mexico

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