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Gonadal variation in Great Lakes sea lamprey, Petromyzon marinus, larvae


, : Gonadal variation in Great Lakes sea lamprey, Petromyzon marinus, larvae. Journal of Great Lakes Research 24(4): 962-968

The observation of atypical gonads in land-locked sea lamprey larvae from several streams tributary to the Great Lakes led to this descriptive study on typical male and female gonads, as well as atypical gonads. Typical male and female gonads examined in the present study have similar characteristics to those observed in the past; however, larvae with atypical gonads have some characteristics of both male and female larvae. Many of the atypical larvae had an unusual number of germ cells, or many atretic oocytes. Based on quantitative evaluation of several gonadal characteristics of male, female and atypical larvae, it was possible to verify atypical status of 88% of the larvae which had been qualitatively assigned the atypical sex. Examination of larvae from 15 different populations suggest the proportion of atypical larvae is currently much higher in streams tributary to the Great Lakes, than was previously observed. The slowing of gonadogenesis, or the diversion of energy for somatic development are possible causes of the atypical gonads observed in this study.

US$19.90

DOI: 10.1016/s0380-1330(98)70876-7


Other references

Campbell, J.B.; Bassett, C.A.; Robertson, J.W., 1958: Clinical use of freeze-dried human dura mater. Journal of Neurosurgery 15(2): 207-214

Onkendi, E.O.; Naik, N.D.; Rosedahl, J.K.; Harmsen, S.W.; Gostout, C.J.; Baron, T.H.; Sarr, M.G.; Que, F.G., 2015: Adenomas of the ampulla of Vater: a comparison of outcomes of operative and endoscopic resections. Data comparing operative and endoscopic resection of adenomas of the ampulla of Vater are limited. Our aims were to evaluate and compare the long-term results and outcomes of endoscopic and operative resections of benign tumors of the ampulla of V...

Togari, A.; Arai, M., 2008: Pharmacological topics of bone metabolism: the physiological function of the sympathetic nervous system in modulating bone resorption. The vertebrate skeleton is richly innervated with adrenergic and peptidergic nerve terminals, and these play important roles in bone remodeling. Recent studies have generally shown that increased sympathetic nervous activity causes bone loss via a...

Ludkiewicz, B.; Domaradzka-Pytel, B.; Moryś, J., 2001: Microglial and astroglial cells in the rat paraclaustral reservoir during postnatal development: an immunohistochemical study. A immunohistochemical study of postnatal development of the paraclaustral reservoir of migrating cells in the rat brain was performed using anti-GFAP (for astroglia), ED1 and OX-42 (for microglia) antibodies. From birth to the 4th day of postnatal...

Takacs Hajos, M., 1999: Colour components of different table beet varieties. Of the tested cultivars (Bonel, Nero, Favorit, Rubin and Detroit) Bonel and Favorit had the highest betanin content (50.03 and 49.53 mg/100 g, respectively). The isobetanin content varied between cultivars (13.10-26.62 mg/100 g). Values between 2....

Guerrissi, J.O.; Jeandet, F., 2002: Scalping forehead flap for extranasal reconstructions: total reconstruction of the lower lid. J. M. Converse described the scalping forehead flap in 1942 with the aim of using it in total nasal reconstruction. A rich net of arterial and venous vessels constitute the basic pattern of its blood supply through three principal pedicles: (1) te...

Gandel'sman, A.B., 1979: Aleksandr Borisovich Gandel'sman (on his 70th birthday). Fiziologicheskii Zhurnal SSSR Imeni I. M. Sechenova 65(12): 1859-1859

Hinton, A., J.; Hume, M.E.; Deloach, J.R., 1993: Role of metabolic intermediates in the inhibition of Salmonella typhimurium and Salmonella enteritidis by Veillonella. A Veillonella sp. was isolated from the cecal contents of adult chickens. The Veillonella was grown on an agar medium supplemented with 200 mM of lactate, pyruvate, fumarate, or succinate and adjusted to a pH of 6.7, 6.5, 6.3, 6.1, 5.9, or 5.7. No...

Vickers, C.L., 1960: Diseases of baby pigs. Part II. Amongst other diseases-of pigs, Vkkers discusses Strongylmdes ransom, the intestinal threadworm. He enumerates the predisposing causes, age incidence, symptoms and diagnosis of infection and mentions die great necessity of prevention owing to the...

Jung, H.Young.; Yoon, J.Shik.; Park, B.Soon., 2002: Recovery of proximal and distal arm weakness in the ipsilateral upper limb after stroke. Conservation of the ipsilateral upper limb function is important in stroke subjects with contralateral hemiplegia, because often it must serve as a compensatory tool for activities of daily livings (ADLs). However, the amount of functional loss an...