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Jonathan Havenhand

Forskare

Jonathan Havenhand
Forskare
Akademisk grad: Doktor,
jon.havenhand@marine.gu.se
031-786 9682
0766-229682

Postadress: Tjärnö, 45296 Strömstad
Besöksadress: Tjärnö , 45296 Strömstad


Institutionen för marina vetenskaper (Mer information)
Box 461
405 30 Göteborg
Besöksadress: Carl Skottsbergs gata 22 B , 413 19 Göteborg

Om Jonathan Havenhand

Jon Havenhand researches the evolutionary ecology of reproduction in marine invertebrates, focussing on intra-specific variation in fertilization and larval viability and the role of ocean acidification.

 

Description of research activities

Jon Havenhand’s research focuses on the evolution of early life-history characteristics in marine invertebrates. This ranges from investigations of gamete-compatibilties in broadcast-spawning species, to the selective benefits of different larval forms.

 

Fertilization and Larval Ecology of marine invertebrates
The majority of marine animals release their gametes freely into the water-column, where they fertilize, and develop. This process is neither simple nor risk-free: gametes can face many difficulties locating each other and fertilizing successfully. Gamete dilution can be a big problem, but sometimes eggs may also be exposed to too many sperm - leading to death of the embryo. Once gametes have encountered each other successfully, a variety of compatibility mechanisms may determine which individual’s sperm is most likely to bind, penetrate, and fertilize the egg. Not surprisingly, a variety of adaptations have evolved in response to these selective pressures, and much recent theory has focussed on this.

Fertilized embryos also face a number of challenges - not least because they’re usually unprotected and easy prey for many planktivorous predators. In some species embryos may develop rapdily without feeding into larvae that settle and metamorphose within hours of fertilization. In others, embryos develop as longer-term larvae that feed and grow in the plankton for many weeks before settling to the seabed and metamorphosing into a juvenile.

The great variety of larval forms in marine invertebrates was comprehensively classified only 60 years ago by Gunnar Thorson. Since that time the ecology and evolution of reproduction in marine invertebrates has been a focus of research, not least because the different energetic costs, survival probabilities, dispersal capacities and behaviours of these different larval forms have deep significance for population dynamics, gene-flow, and adaptation in marine species. Jon currently works with several closely related aspects of this area:

  • patterns, causes and consequences of variation in sperm:egg compatibility
  • effects of ocean acidification on early life-history stages of marine invertebrates - including the assessment of non-significant results
  • impacts of larval type on the energetics of adult populations

Jon is pursuing these research interests in collaboration with a number of Masters and PhD students as well as several leading international researchers.

Senaste publikationer

Societal causes of, and responses to, ocean acidification.
Sverker C. Jagers, Simon Matti, Anne-Sophie Crépin, David Langlet, Jonathan N. Havenhand et al.
Ambio, Artikel i vetenskaplig tidskrift 2019
Artikel i vetenskaplig tidskrift

Ecological & functional consequences of coastal ocean acidification: perspectives from the Baltic-Skagerrak system
Jonathan N. Havenhand, Helena L. Filipsson, Susa Niiranen, Max Troell, Anne-Sophie Crépin et al.
Ambio, Forskningsöversiktsartikel 2019
Forskningsöversiktsartikel

Sperm motility of oysters from distinct populations differs in response to ocean acidification and freshening
L. J. Falkenberg, C. A. Styan, Jonathan N. Havenhand
Scientific Reports, Artikel i vetenskaplig tidskrift 2019
Artikel i vetenskaplig tidskrift

Handbook to support the SCOR Best Practice Guide for ‘Multiple Drivers’ Marine Research
Philip Boyd, S. Collins, Samuel Dupont, K. Fabricius, J.-P. Gattuso et al.
University of Tasmania, Rapport 2019
Rapport

Toxic Algae Silence Physiological Responses to Multiple Climate Drivers in a Tropical Marine Food Chain
Lucy M. Turner, Jonathan N. Havenhand, C. Alsterberg, A. D. Turner, S. K. Girisha et al.
Frontiers in Physiology, Artikel i vetenskaplig tidskrift 2019
Artikel i vetenskaplig tidskrift

Long-term exposure to acidification disrupts reproduction in a marine invertebrate
Christian Pansch, Giannina Hattich, Mara E. Heinrichs, Andreas Pansch, Zuzanna Zagrodzka et al.
PLoS ONE, Artikel i vetenskaplig tidskrift 2018
Artikel i vetenskaplig tidskrift

Experimental strategies to assess the biological ramifications of multiple drivers of global ocean change-A review
P. W. Boyd, S. Collins, Samuel Dupont, K. Fabricius, J. P. Gattuso et al.
Global Change Biology, Artikel i vetenskaplig tidskrift 2018
Artikel i vetenskaplig tidskrift

Visar 51 - 60 av 78

2010

2009

Fertilization Strategies.
E. A. Serrao, Jonathan N. Havenhand
Hard bottom communities. Patterns, scales, dynamics, functions, shifts., Springer Verlag, Kapitel i bok 2009
Kapitel i bok

Reproduction and larvae / spore types.
Jonathan N. Havenhand, C. A. Styan
Biofouling. S. Dürr and J. C. Thomason. London., London, Blackwell, Kapitel i bok 2009
Kapitel i bok

Near-future levels of ocean acidification do not affect sperm motility and fertilization kinetics in the oyster Crassostrea gigas.
Jonathan N. Havenhand, P. Schlegel
Biogeosciences, Artikel i vetenskaplig tidskrift 2009
Artikel i vetenskaplig tidskrift

2008

Near-future levels of ocean acidification reduce fertilization success in a sea urchin
Jonathan N. Havenhand, F. R. Buttler, Michael C. Thorndyke, J. E. Williamson
Current Biology, Artikel i vetenskaplig tidskrift 2008
Artikel i vetenskaplig tidskrift

Försurning i klimatförändringens spår
Jonathan N. Havenhand, Samuel Dupont, Michael C. Thorndyke
HAVET 2008, Stockholm, Naturvårdsverket, Kapitel i bok 2008
Kapitel i bok

CO2-driven ocean acidification radically affect larval survival and development in the brittlestar Ophiothrix fragilis
Samuel Dupont, Jonathan N. Havenhand, W., Thorndyke, L.S., Peck, Michael C. Thorndyke
Marine Ecology - Progress Series, Artikel i vetenskaplig tidskrift 2008
Artikel i vetenskaplig tidskrift

CO2-driven acidification radically affects larval survival and development in marine organisms
Samuel Dupont, Jonathan N. Havenhand, Michael C. Thorndyke
Comparative Biochemistry and Physiology a-Molecular & Integrative Physiology, Artikel i vetenskaplig tidskrift 2008
Artikel i vetenskaplig tidskrift

Visar 51 - 60 av 78

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