Friday, August 22, 2014
   
Text Size
Info: Your browser does not accept cookies. To put products into your cart and purchase them you need to enable cookies.
PDFPrintE-mail
aqua 15(3)_Heteroconger mercyaeaqua 15(4)_Epigonus

aqua 15(4)_ Cycles

SINGLE PAPER

Volume 15, Issue 4

15 October 2009

José I. Castro: Observations on the reproductive cycles of some viviparous North American sharks, pp. 205-222


( Manufacturer )
€10,00
Number pieces in packaging:1
Ask a question about this product

SINGLE PAPER

Volume 15, Issue 4

15 October 2009

José I. Castro: Observations on the reproductive cycles of some viviparous North American sharks, pp. 205-222

Abstract
The reproductive cycle of sharks is defined by how often a species breeds and consists of two periods: vitellogenesis and gestation. These two periods can run concurrently or consecutively, and the duration of each period is variable. Together, the periods of vitellogenesis and gestation determine the length of the reproductive cycle. The genera Rhizoprionodon, Mustelus, and some Sphyrna exhibit annual cycles with concurrent vitellogenesis and gestation, and thus, they produce one brood each year. Carcharias taurus females apparently have a biennial reproductive cycle with discontinuous ovulation. Alopias spp. exhibit an annual cycle with concurrent vitellogenesis and gestation, and have continuous ovulation. Squalus acanthias has a squaloid biennial cycle with concurrent vitellogenesis and gestation. Sharks of the genera Carcharhinus, some Sphyrna, and Ginglymostoma have a biennial cycle with consecutive vitellogenesis and gestation. Galeocerdo cuvier has a 12-month gestation period in the western Atlantic, its reproductive cycle may be biennial. Carcharhinus obscurus has an 18-month gestation period and probably a three-year reproductive cycle. The biennial cycle, with all its variations, is found in sharks of different phyletic origins such as carcharhinoid, squaloid, and orectoloboid sharks, reflecting their common physiological processes that require a long time to accumulate sufficient energy to produce a brood.




You may also be interested in this/these product(s)

€19,00










Managing Editor

Heiko Bleher
Via G. Falcone 11,
27010 Miradolo Terme (PV), Italy
Tel. & Fax: +39-0382-754129
E-mail: heiko@aquapress-bleher.com
www.aqua-aquapress.com

New Scientific Editor

Flávio C. T. Lima
Museu de Zoologia da Universidade
Estadual de Campinas “Adão José Cardoso”
Rua Albert Einstein s/n, Caixa Postal 6109,
13083-863 Campinas, São Paulo, Brazil
Tel. +55 019-3521-6385

aqua International Journal

aqua is a fully peer-reviewed
scientific Journal published
every January, April, July and October
by Aquapress Publishers
Via G. Falcone 11
I-27010 Miradolo Terme (Pavia) ITALY
© aqua, International Journal of Ichthyology
ISSN 0945-9871

Social Bookmark

FacebookTwitterDeliciousStumbleuponGoogle BookmarksLinkedin

Aqua Shop

Product categories

scientific journal    Institutional Subscription    Personal Subscription    aqua 20(2)    aqua 20(1)    aqua 19(4)    aqua 19(3)    aqua 19(2)    aqua 19(1)    aqua 18(4)    aqua 18(3)    aqua 18(2)    aqua 18(1)    aqua 17(4)    aqua 17(3)    aqua 17(2)    aqua 17(1)    aqua 16(4)    aqua 16(3)    aqua 16(2)    aqua 16(1)    aqua 15(4)    aqua 15(3)    aqua 15(2)    aqua 15(1)    aqua 14(4)    aqua 14(3)    aqua 14(2)    aqua 14(1)    aqua 13(3-4)    aqua 13(2)    aqua 13(1)    aqua 12(4)    aqua 12(3)    aqua 12(2)    aqua 12(1)    aqua 11(4)    aqua 11(3)    aqua 11(2)    aqua 11(1)    aqua 10(4)    aqua 10(3)    aqua 10(2)    aqua 10(1)    aqua 9(4)    aqua 9(3)    aqua 9(2)    aqua 9(1)    aqua 8(4)    aqua 8(3)    aqua 8(2)    aqua 8(1)    aqua 7(4)    aqua 7(3)    aqua 7(2)    aqua 7(1)    aqua 6(4)    aqua 6(3)    aqua 6(2)    aqua 6(1)    aqua 5(4)    aqua 5(3)    aqua 5(2)    aqua 5(1)    aqua 4(4)    aqua 4(3)    aqua 4(2)    aqua 4(1)    aqua 3(4)    aqua 3(3)    aqua 3(2)    aqua 3(1)    aqua 2(4)    aqua 2(3)    aqua 2(2)    aqua 2(1)    aqua 1(4)    aqua 1(3)    aqua 1(2)    aqua 1(1)    aqua - Special Publication    Complete Set 50% Discount

List All Products





Forgot your password?
Forgot your username?
No account yet? Register

Download Area
Show Cart
Your Cart is currently empty.

Who's Online

We have 62 guests online

Users by Countries

Dimension: Country
Metric: Visits

loader

Claim policy

Orders are regarded as firm and are not refundable. Taking out an annual subscription commits you for a minimum of one year.

Subscription will be renewed automatically. If you have received a renewal invoice and do not wish to continue with the subscription, please submit the cancellation in writing within one month to:

e-mail: aqua@aquapress-bleher.it

Fax: 0039 0382754129

Reviews - Top

1. best site, best contents

Scope

aqua is an international journal which publishes original scientific articles in the fields of systematics, taxonomy, bio-geography, ethology, ecology, and general biology of fishes since 1994. Papers on freshwater, brackish, and marine fishes will be considered. aqua is fully refereed and aims at publishing manuscripts within 2-4 months of acceptance. In view of the importance of colour patterns in species identification and animal ethology, authors are encouraged to submit colour illustrations in addition to descriptions of coloration. It is our aim to provide the international scientific community with an efficiently published journal meeting high scientific and technical standards.

Call for Papers

The editors welcome the submission of original manuscripts which should be sent in digital format to the scientific editor. 
Full length research papers and short notes will be considered for publication. There are no page charges and colour illustrations will be published free of charge. Authors will receive one free copy of the issue in which their paper is published and an e-print in PDF format.

Member Login