The University of Southampton
University of Southampton Institutional Repository

Protandric hermaphroditism in the whale-fall bivalve mollusc Idas washingtonia

Protandric hermaphroditism in the whale-fall bivalve mollusc Idas washingtonia
Protandric hermaphroditism in the whale-fall bivalve mollusc Idas washingtonia
Whale falls provide abundant but relatively ephemeral, sulphide-rich habitat islands on the deep-sea floor. To explore life-history adaptations to whale-fall habitats, we examined the reproductive biology of Idas washingtonia, a bathymodiolin mussel occurring in abundance on sunken whale skeletons in the deep northeast Pacific Ocean. Analysis of the reproductive biology of I. washingtonia demonstrates strong evidence of protandric hermaphroditism. Developing males were recognised in individuals as small as 1.7 mm shell length and spermatogenesis continued until 7 mm length. At >6.5 mm, males were generally spent and the first previtellogenic oocytes were observed. Although developing females were found as small as 4.5 mm shell length, most well-developed females were >6 mm shell length. Overall, females only formed 12% of the population. As with other modiolid bivalves, fecundity was high and the egg size <50 ?m, indicative of planktotrophic development. The occurrence of protandric hermaphroditism, high fecundity and planktotrophic dispersal may be an adaptation to the ephemeral nature of their habitat. The success of this adaptation is shown by the rapid colonisation of whale falls even though these may have been severely reduced in abundance since the peak of commercial whaling activity in the 20th century.

Whale fall, Idas, Reproduction, Protandric hermaphrodite
0967-0645
1689-1699
Tyler, Paul A.
d1965388-38cc-4c1d-9217-d59dba4dd7f8
Marsh, Leigh
b9d089aa-91e4-4a2e-b716-a7352616c6a2
Baco-Taylor, Amy
8ec0e11d-4262-4277-b164-8990cd27112c
Smith, Craig R.
f930361f-9312-4e0a-9832-26008197eb32
Tyler, Paul A.
d1965388-38cc-4c1d-9217-d59dba4dd7f8
Marsh, Leigh
b9d089aa-91e4-4a2e-b716-a7352616c6a2
Baco-Taylor, Amy
8ec0e11d-4262-4277-b164-8990cd27112c
Smith, Craig R.
f930361f-9312-4e0a-9832-26008197eb32

Tyler, Paul A., Marsh, Leigh, Baco-Taylor, Amy and Smith, Craig R. (2009) Protandric hermaphroditism in the whale-fall bivalve mollusc Idas washingtonia. Deep Sea Research Part II: Topical Studies in Oceanography, 56 (19-20), 1689-1699. (doi:10.1016/j.dsr2.2009.05.014).

Record type: Article

Abstract

Whale falls provide abundant but relatively ephemeral, sulphide-rich habitat islands on the deep-sea floor. To explore life-history adaptations to whale-fall habitats, we examined the reproductive biology of Idas washingtonia, a bathymodiolin mussel occurring in abundance on sunken whale skeletons in the deep northeast Pacific Ocean. Analysis of the reproductive biology of I. washingtonia demonstrates strong evidence of protandric hermaphroditism. Developing males were recognised in individuals as small as 1.7 mm shell length and spermatogenesis continued until 7 mm length. At >6.5 mm, males were generally spent and the first previtellogenic oocytes were observed. Although developing females were found as small as 4.5 mm shell length, most well-developed females were >6 mm shell length. Overall, females only formed 12% of the population. As with other modiolid bivalves, fecundity was high and the egg size <50 ?m, indicative of planktotrophic development. The occurrence of protandric hermaphroditism, high fecundity and planktotrophic dispersal may be an adaptation to the ephemeral nature of their habitat. The success of this adaptation is shown by the rapid colonisation of whale falls even though these may have been severely reduced in abundance since the peak of commercial whaling activity in the 20th century.

Text
Tyleretal2009DSRIIIdas.pdf - Version of Record
Restricted to Repository staff only
Request a copy

More information

Published date: September 2009
Keywords: Whale fall, Idas, Reproduction, Protandric hermaphrodite

Identifiers

Local EPrints ID: 68877
URI: http://eprints.soton.ac.uk/id/eprint/68877
ISSN: 0967-0645
PURE UUID: b2e16c99-6063-456b-99c4-89d9546e6323

Catalogue record

Date deposited: 06 Oct 2009
Last modified: 19 Jul 2019 23:48

Export record

Altmetrics

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×