Aspects of the breeding biology of Janaira gracilis Moreira & Pires (Crustacea, Isopoda, Asellota)

Aspects of the breeding biology of Janaira gracilis Moreira & Pires (Crustacea, Isopoda, Asellota)

Plínio Soares Moreira; Ana Maria Setubal Pires^*

Instituto Oceanográfico da Universidade de São Paulo

SYNOPSIS

The biological aspects of incubating females of Janaira gracilis Mbreira & Pires, are described. The marsupium is formed by 4 pairs of oostegites arising from pereopods I-IV. The oostegites appear for the first time at the post-marsupial stage 7 (preparatory stage 1), growing successively at each moult until stage 9 (brooding stage 1), when they reach fully development. The sizes of the eggs increase with the body size of the females. The number of eggs, per female, is a linear function of the body volume, i.e., the fecundity increases with the female's body size. The number of eggs, embryos and juveniles decrease during the marsupial development. This decrease in brood number is higher between the last two marsupial stages, i.e., from stage C to D, than between the preceding marsupial stages. The average and overall brood mortality rate is of 38.95%.

RESUMO

São descritos, no presente trabalho, vários aspectos relacionados à biologia de fêmeas grávidas de Janaira gracilis Moreira & Pires. O marsúpio é formado por 4 pares de oostégitos, que partem dos pereópodos I-IV. Os oostégitos, que surgem pela primeira vez no estádio 7 do desenvolvimento pós-marsupial (estágio preparatório 1), crescem nas sucessivas mudas, atingindo no estágio 9 (estágio reprodutor 1) seu pleno desenvolvimento. O tamanho dos ovos é proporcional ao tamanho das fêmeas. O número de ovos, por fêmeas, e proporcional ao volume das fêmeas, isto é, a fecundidade é mais elevada nos exemplares de maior comprimento. O número de ovos, embriões e jovens decresce com o desenvolvimento marsupial, sendo este decréscimo maior entre os dois últimos estágios marsupials (i.é., entre os estágios C e D) do que entre os estágios precedentes. A taxa média de mortalidade marsupial é de 38.95%.

Full text available only in PDF format.

Texto completo disponível apenas em PDF.

REFERENCES

BOURDON, R. 1964. Notes sur la biologie de Dynamene bidentata Adams (Isopode, Sphaeromatidae). Bull. trimest. Acad. Soc. Lorraines Sci., 4:155-162.

CAREFOOT, T. H. 1973. Studies on the growth, reproduction and life cycle of the supralittoral isopod Ligia pallasii. Mar. Biol., 18(4):302-311.

DEARBORN, J. H. 1967. Food and reproduction of Glyptonotua antarcticus (Crustacea: Isopoda) at McMurdo Sound, Antarctica. Trans. Roy Soc. New Zel., zool., 8(15):163-168.

ELLIS, R. J. 1961. A life history study of Asellus intermedius Forbes. Trans. Am. microsc. Soc, 80(1):80-102.

ELTRINGHAM, S. K. & HOCKLEY, A. R. 1961. Migration and reproduction of the wood-boring isopod, Limnoria, in Southampton water. Limnol. & Oceanogr., 6(4):467-482.

FISH, S. 1970. The biology of Eurydice pulchra (Crustacea: Isopoda). J. mar. biol. Ass. U. K., 50:753-768.

GEBELIN, F. 1939. Observations relatives a la sexualité de l'isopode oniscoide Ligia oceanicá. Développement des oostegites. Bull. Soc. zool. Fr., 64:190-200.

GREEN, J. 1965. Chemical embriology of the Crustacea. Biol. Rev., 40(4):580-600.

HATCHETT, S. P. 1947. Biology of the Isopoda of Michigan. Ecol. Monogr., 17:47-79.

HESSLER, R. R. 1970. The Desmosomatidae (Isopoda, Aseliota) of Gay Head-Bermuda Transect. Bull. Scripps Instn Oceanogr., 15:1-185.

HOLDICH, D. M. 1968. Reproduction, growth and bionomics of Dynamene bidentata (Crustacea, Isopoda). J. Zool., 156:137-153.

HOWES, N. H. 1939. Observations on the biology and post-embryonic development of Idotea viridis (Slabber) (Isopoda, Valvifera) from New England Creek, South-east Essex. J. mar. biol. Ass. U. K., 23:279-310.

JANCKE, 0. 1924. Die Brutpflege einiger Malakostraken. Zool. Anz., 58(9/10):273-278.

______ 1926. Über die Brutpflege einiger Malakostraken. Arch. Hydrobiol., 17:678-698.

JONES, D. A. 1970. Populations densities and breeding in Eurydice pulchra and Eurydice affinis in Britain. J. mar. biol. Ass. U. K., 50:635-655.

JONES, M. B. 1974. Breeding biology and seasonal population changes of Jaera nordmanni nordica Lemercier (Isopoda, Asellota). J. mar. biol. Ass. U. K., 54:727-736.

______ & NAYLOR, E. 1971. Breeding and bionomics of the British members of the Jaera albifrons group of species (Isopoda: Asellota) J. Zool. London, 165(2):183-199.

JENSEN, J. P. 1955. Biological observations on the isopod Sphaeroma hookeri Leach. Vidensk. Medd. dansk naturh. Foren., 117:305-339.

______ 1958. The relation between body size and nunber of eggs in marine Malacostrakes. Meddr Danm. Fisk. og Havunders., n. s., 2(19):3-28.

KJENNERUD, J. 1952. Ecological observations on Idotea neglecta G. O. Sars. Univ. Bergen Arb. (Naturv. rekke), 7:1-47.

KLAPOW, L. A. 1970. Ovoviviparity in the genus Excirolana (Crustacea: Isopoda). J. Zool. London, 162(3):359-369, pl.1.

LEMERCIER, A. 1957. Sur le développement in vitro des embryons d' un Crustacé Isopode Asellote: Jaera marina (Fabr.). C. R. Acad. Sei. Paris, 244(9):1280-1283.

MARKUS, H. C. 1930. Studies on the morphology and life history of the isopod, Mancasellus macrourus. Trans. Amer, microsc. Soc, 49(3):220-236, pl.26.

MAUCHLINE, J. 1973. The broods of British Mysidacea (Crustacea). J. mar. biol. Ass. U. K., 53(4):801-817.

MENZIES, R. J. 1954. The comparative biology of reproduction in the wood-boring isopod crustacean Limnovia. Bull. Mus. comp. Zool. Harv., 112(5):263-388.

MOREIRA, P. S. 1971. Fisioecologia de isopodes do gênero Serolis Leach, 1818 (Crustacea, Serolidae). Livre Docência thesis. University of São Paulo, 297p. + atlas.

______ 1973a. Arcturella sawayae, a new species of Isopoda Crustacea from southern Brazil. Bolm Zool. Biol, mar., n. s., (30):185-194, pls.1-3.

______ 1973b. Behavioral aspects of Arcturella sawayae Moreira, 1973 (Crustacea, Isopoda, Valvifera). Bolm Zool. Biol. mar. n.s., (30):217-232.

______ 1973c. Biologia de Serolis completa (Crustacea, Isopoda, Flabellifera). I. Estádios de desenvolvimento. Bolm Inst.oceanogr., S Paulo, 22:93-108.

______ 1974. New records and a new species of Serolis (Crustacea, Isopoda, Flabellifera) from southern Brazil. Bolm Inst, oceanogr., S Paulo, 23:121-153.

______ & PIRES, A.M.S. Janaira gracilis, a new genus and species of Janirid isopod (Crustacea, Peracarida) from Brazil. Crustaceana (in press).

NAYLOR, E. 1955. The life cycle of the isopod Idotea emarginata (Fabricius). J. Anim. Ecol., 24(2):270-281.

______ & QUÉNISSET, D. 1964. The habitat and life history of Naesa bidentata (Adams). Crustaceana, 7(5):212-216.

PIRES, A. M. S. 1975. Sobre a biologia de Janaira gracilis (Crustacea, Isopoda, Asellota) da fauna vágil de Sargassum cymosum. MS dissertation, University of São Paulo, 51p., 10tabs, 81figs, (unpublished).

______ 1977. Desenvolvimento marsupial e pós-marsupial de Janaira gracilis (Crustacea, Isopoda, Asellota). Bolm Inst, oceanogr., S Paulo, 26:21-50.

SALVAT, B. 1966. Eurydice pulchra (Leach, 1815), E. affinis (Hansen, 1905) (Isopodes, Cirolanidae), taxonomie, ethologie, ecologie, repartition vertical et cycle reproducteur. Act. Soc. Linn. Bordeaux, sér. A, 103:1-77.

SAUDRAY, Y. & LEMERCIER, A. 1960. Observations sur le developpment des oeufs de Lígia ooeanica Fabr. Crustacé Isopode Oniscoide. Bull. Inst, océanogr. Monaco, (1162):1-11.

SØMME, O. M. 1941. A study of the life history of the gribble Linmovia lignovum (Rathke) in Norway. Nytt Mag. Naturvid., 81:145-205.

STEEL, E. A. 1961. Some observations on the life history of Asellus aquaticus (L.) and Asellus meridianus Racovitza (Crustacea: Isopoda). Proc. zool. Soc. Lend., 137(1):71-87.

TALIN, J, 1970. Sur le cycle biologique de Sphaeroma hookeri Leach (Isopode flabellifère) dans les eaux de la Durangole (B. du Rh.) Hydrobiologie, 36(2):295-303.

TETART, J. 1962. Étude morphologique de Campecopea hirsuta (Montagu). Bull. Soc. Linn. Normandie, 10(3):158-164.

WHITE, M. G. 1970. Aspects of the breeding biology of Glyptonotus antarcticus (Eights) (Crustacea, Isopoda) at Signy Island, South Orkney Islands. In: Holdgate, M. W., ed.- Antarctic ecology. London, Academic Press, vol. 1:279-285.

WOLFF, T. 1962. The systematics and biology of bathyal and abyssal Isopoda Asellota. Galathea Rep., (6):1-320, pls.1-19.

ZIMMER, C. 1926. Northern and Aretie invertebrates in the collection of the Swedish State Museum. X. Cumaceen. K. svensk VetenskAkad. Handl., sér. 3,3(2):1-88.

(Received August 22/1975)

*

Supported by a fellowship given by the Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP).

Publication Dates

• Publication in this collection
  11 June 2012
• Date of issue
  1977

History

• Received
  22 Aug 1975