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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 41 - 50 av 78

2013

Larval development of the barnacle Amphibalanus improvisus responds variably but robustly to near-future ocean acidification
C Pansch, P Schlegel, Jonathan N. Havenhand
ICES Journal of Marine Science, Artikel i vetenskaplig tidskrift 2013
Artikel i vetenskaplig tidskrift

2012

Impacts of climate change, including acidification, on marine ecosystems and fisheries.
Keith Brander, Jonathan N. Havenhand
Climate impacts on the Baltic Sea: from science to policy, Berlin, Springer, Kapitel i bok 2012
Kapitel i bok

Strategies for protection of wooden underwater cultural heritage in the Baltic sea against marine borers. The EU project "WreckProtect"
Charlotte Björdal, D. Gregory, M. Manders, Z. Al-Hamdani, Christin Appelqvist et al.
Conservation and Management of Archeological Sites, Artikel i vetenskaplig tidskrift 2012
Artikel i vetenskaplig tidskrift

Individual Variability in Reproductive Success Determines Winners and Losers under Ocean Acidification: A Case Study with Sea Urchins
P. Schlegel, Jonathan N. Havenhand, M. R. Gillings, J. E. Williamson
Plos One, Artikel i vetenskaplig tidskrift 2012
Artikel i vetenskaplig tidskrift

Yoga for reducing perceived stress and back pain at work.
Ned Hartfiel, Chris Burton, Jo Rycroft-Malone, Graham Clarke, Jonathan N. Havenhand et al.
Occupational Medicine, Artikel i vetenskaplig tidskrift 2012
Artikel i vetenskaplig tidskrift

Comparing reconstructed past variations and future projections of the Baltic Sea ecosystem-first results from multi-model ensemble simulations
H. E. M. Meier, H. C. Andersson, B. Arheimer, T. Blenckner, B. Chubarenko et al.
Environmental Research Letters, Artikel i vetenskaplig tidskrift 2012
Artikel i vetenskaplig tidskrift

2011

Effect of ocean acidification on marine fish sperm (Baltic cod: Gadus morhua)
Andrea Frommel, V Stiebens, Catriona Clemmesen, Jonathan N. Havenhand
Biogeosiences, Artikel i vetenskaplig tidskrift 2011
Artikel i vetenskaplig tidskrift

The effectiveness of yoga for the improvement of well-being and resilience to stress in the workplace
N. Hartfiel, Jonathan N. Havenhand, S. B. Khalsa, G. Clarke, A. Krayer
Scandinavian Journal of Work Environment & Health, Artikel i vetenskaplig tidskrift 2011
Artikel i vetenskaplig tidskrift

Visar 41 - 50 av 78

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