1 / 10

Seasonal Patterns and Mollusk reproduction

Seasonal Patterns and Mollusk reproduction. Ashlyn Giddings. Mollusca. Variety of reproductive strategies and life cycles Mostly dioecious with some species hermaphroditic External or internal fertilization (UCMP , 2006; UCMP, 2001). (Cob, 2013).

cain
Download Presentation

Seasonal Patterns and Mollusk reproduction

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Seasonal Patterns and Mollusk reproduction Ashlyn Giddings

  2. Mollusca • Variety of reproductive strategies and life cycles • Mostly dioecious with some species hermaphroditic • External or internal fertilization (UCMP, 2006; UCMP, 2001) (Cob, 2013)

  3. Difficulties in Studying Seasonal reproduction in the ocean • Difficulty in witnessing spawning events • Individual seasonal reproduction may be obscured at the population level (Eckelbarger, 1995) • Seasonal patterns can vary with location, even within a species (Lourenço et al, 2012) (Wikipedia, 2007a)

  4. photoperiod • Photoperiod is the length of daylight • Can be a seasonal indicator in species in the euphotic zone (Hodgson, 2010) • Photoperiod can influence juvenile survival (Koueta, 2003) • Example: Sepia officinalis L. (Koueta, 2003) (Wikipedia, 2007b)

  5. Water temperature • Warmer water = reproduction (Hodgson, 2010; Wayne, 2001) • Examples: Aplysiacalifornica(Wayne, 2001) (Wikipedia, 2004)

  6. Food Availability • Food availability triggers oogenesis or signals that conditions are optimal for larval development (Eckelbarger, 1995) • Example: Aulacomyaater(Hodgson, 2010) (WoRMS, 2013)

  7. Evolutionarily conserved • Ancestral breeding patterns may be conserved independent of local conditions (Hodgson, 2010) • Deep sea species likely retain seasonal patterns in reproduction (Eckelbarger, 1995) • Example: Helcion spp. (Hodgson, 2010) (Poppe, 2003)

  8. Human impacts • Climate change- increased temperature can have deleterious effects on Mollusks (Kirby et al, 2008) • Plasticizers (Phthalates and Bisphenol A)- Mollusks appear very sensitive (Oehlmann et al., 2009) • Estrogenic chemicals (Bisphenol A, etc) stimulate egg production at low doses/inhibit at higher doses (Jobling et al., 2003) (Wikipedia, 2006)

  9. Sources • Cob, G. Taxonomy. http://www.nhm.ac.uk/nature-online/species-of-the-day/collections/our-collections/glaucus-atlanticus/taxonomy/index.html 2013-04-20 • Eckelbarger, K. , L. Watling. 1995. Role of phylogenetic constraints in determining reproductive patterns in deep-sea invertebrates. Invertebrate Biology 114(3): 256-269 • Hodgson, A. 2010. Reproductive seasonality of southern African inshore and estuarine invertebrates – a biogeographic review. African Zoology 45(1): 1-17 • Jobling, S. D. Casey, T. Rodgers-Gray, J. Oehlmann, U. Schulte-Oehlmann, S. Pawlowski, T. Baunbeck, A.P. Turner, C.R. Tyler. 2003. Comparative responses of molluscs and fish to enviromental estrogens and an estrogenic effluent. Aquatic Toxicology 65(2): 205-220 • Kirby, P.R., G. Beaugrand, J.A. Lindley. 2008. Climate-induced effects on the meroplankton and the benthic-pelagic ecology of the North Sea. Limnology and Oceanography 53(5): 1805-1815 • Koueta, N., E. Boucaud-Camou. 2003. Combined effects of photoperiod and feeding frequency on survival and growth of juvenile cuttlefish Sepia officinalis L. in experimental rearing. Journal of Experimental Marine Biology and Ecology 296(2): 215-226 • Lourenço, S., A. Moreno, L. Narciso, Á. F. González, J. Pereira. 2012. Seasonal trends of the reproductive cycle of Octopus vulgaris in two environmentally distinct coastal areas. Fisheries Research. 127–128: 116-124

  10. Sources • Oehlmann, J., U. Schulte-Oehlmann, W. Kloas, O. Jagnytsch, I. Lutz, K.O. Kusk, L. Wollenberger, E.M. Santos, G. C. Paull, K. J. W. Van Look, C. R. Tyler. A critical analysis of the biological impacts of plasticizers on wildlife. Phil. Trans. R. Soc. B 236(1526): 2047-2062 • Poppe, G. 2003. Helcion (Helcion) pectunculus. http://www.gastropods.com/7/Shell_15697.shtml 2013-04-20 • WoRMS. 2013. Aulacomyaatra. http://www.marinespecies.org/aphia.php?p=image&pic=65426 2013-04-20 • University of California Museum of Paleontology (UCMP), 2001. The Bivalvia. http://www.ucmp.berkeley.edu/taxa/inverts/mollusca/bivalvia.php 2013-04-20 • University of California Museum of Paleontology (UCMP), 2006. The Cephalopoda. http://www.ucmp.berkeley.edu/taxa/inverts/mollusca/cephalopoda.php 2013-04-20 • Wayne, N. 2001. Regulation of seasonal reproduction in mollusks. Journal of Biological Rhythms 16(4): 391-402 • Wikipedia 2004. File:Aplysia californica.jpg http://en.wikipedia.org/wiki/File:Aplysia_californica.jpg 2013-04-18 • Wikipedia 2006. File:Mudsnail2.jpg http://en.wikipedia.org/wiki/File:Mudsnail2.jpg 2013-04-20 • Wikipedia 2007a. File:Octopus vulgaris 3.JPGhttp://commons.wikimedia.org/wiki/File:Octopus_vulgaris_3.JPG 2013-04-20 • Wikipedia 2007b. File:Kalamar.jpg http://en.wikipedia.org/wiki/File:Kalamar.jpg 2013-04-20

More Related