Work at University of York, UK

[Richard Law]

Just responding here to Asta's suggestion to find out what people are
doing ...

There are several of us at the University of York UK interested in size,
including Gustav Delius, Richard Southwell and Richard Law.

At the moment we're in an EU project (MINOUW) working towards
technologies for reducing discards in European waters.  The part we play
in this is to develop multispecies size-spectrum dynamics for modelling
the effects of the landing obligation on marine ecosystems.  We're doing
this on the Mizer platform, putting in place a shiny app to make it
easier for practitioners to try out ideas.  In doing this, we've come up
with a new way of constructing multispecies fish assemblages, to make
sure that species known to live together in the sea, can also coexist in
the models.  Currently we're working with Silvia De Juan (Instituto de
Ciencias del Mar IMC-CSIC, Barcelona), to test this approach on shelf
ecosystems in the Western Mediterranean.

We're also interested in questions about evolution in multispecies size
spectra.  This includes some work that Richard Law and Mike Plank
(University of Canterbury NZ) have recently done to bring techniques of
adaptive dynamics and size-spectrum dynamics together.  From this, you
can see how fisheries-induced evolution might proceed under different
schemes of fishing, allowing for the underlying interactions in the food
web.  It's available at: R Law and M J Plank (2018)  Balanced harvesting
could reduce fisheries-induced evolution; Fish and Fisheries DOI:
10.1111/faf.12313  This is just the tip of the iceberg: there's much to
explore in this field.

We're also working with Mariella Canales (Center of Applied Ecology and
Sustainability CAPES, Pontifical Catholic University of Chile, Santiago)
using size-based methods for two problems in the Northern Chile Marine
Ecosystem: (1) the absence of clear stock-recruitment relationships in
anchovy and sardine, and (2) the consequences of changing fishing
mortality on the pelagic fish assemblage.

Our work tends to be at the interface of applied maths, computation and
theoretical ecology.  We're always pleased to develop research with
people who have real-world problems to solve in size-based marine
ecosystems: this helps to keep our work 'grounded'.  The theory is fun
too, for those who are interested!

Richard Law.

--
********************************************************************

Richard Law

York Cross-disciplinary Centre for Systems Analysis (YCCSA)
Ron Cooke Hub
University of York
York
YO10 5GE
UK

email richa...@york.ac.uk
Phone +44 1904 325372
********************************************************************

[Ken Haste Andersen]

Thanks for the initiative with setting up this list.  It is also great to see that work is ongoing with Mizer, and that it is continuously improving!  I hope that it would be possible to make a workshop again, though it is hard with people dispersed wide apart.

At the Center for Ocean Life much work is about size, but the focus right now is on the primary-secondary production (unicellular plankton and copepods). However, some work with fish is ongoing:

I have finished a book manuscript that develops the entire size (and trait) theory behind size spectra.  The theory is applied to single-stock fisheries, to evolutionary impact assessment of fishing, and to community level impacts of fishing.  The code is on GitHub: https://github.com/Kenhasteandersen/Fish.  I did not use mizer because it was too slow (at the time) and the interface more complicated than I needed.  The book will appear this spring.  The first two chapters are attached in case you are interested, and there is an online app for the single-stock stuff here: http://oceanlife.dtuaqua.dk/Fish/

Daniel van Denderen is working on developing the benthic vs pelagic pathways of production into the size-based model framework.  This work is an extension of Julia’s earlier work with benthic spectra.  Our aim is to make global assessment, and to that end we are working with Charlie Stock and Colleen Petrik.  The global model is a simplified version of the full size-spectrum model.

Best,

Ken

---------------------------------------------------------------------------------------------------------------

Ken H. Andersen, http://ken.haste.dk, twitter: @69kno

Professor in theoretical marine ecology, head of section, and deputy director of Centre for Ocean Life http://www.oceanlifecentre.dk

New paper:  Global patterns in marine predatory fish. Nature Ecology and Evolution 2, 65–70 (2018)

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[Asta Audzi]

Hi Ken,

The https://github.com/Kenhasteandersen/Fish link looks great and there are lots of interesting outputs to explore. I am particularly intrigued about the fisheries induced evolution tab and the equations used to calculate the expected changes per year (which are somewhat slower than inferred in a range of other models, but good for managers to see). 

I suppose they will all be described in the "Fish..." book, so looking forward to reading the next chapters :)

regards

Asta

On Wednesday, October 24, 2018 at 8:32:26 PM UTC+11, Ken Haste Andersen wrote:

Thanks for the initiative with setting up this list.  It is also great to see that work is ongoing with Mizer, and that it is continuously improving!  I hope that it would be possible to make a workshop again, though it is hard with people dispersed wide apart.

At the Center for Ocean Life much work is about size, but the focus right now is on the primary-secondary production (unicellular plankton and copepods). However, some work with fish is ongoing:

I have finished a book manuscript that develops the entire size (and trait) theory behind size spectra.  The theory is applied to single-stock fisheries, to evolutionary impact assessment of fishing, and to community level impacts of fishing.  The code is on GitHub: https://github.com/Kenhasteandersen/Fish.  I did not use mizer because it was too slow (at the time) and the interface more complicated than I needed.  The book will appear this spring.  The first two chapters are attached in case you are interested, and there is an online app for the single-stock stuff here: http://oceanlife.dtuaqua.dk/Fish/

Daniel van Denderen is working on developing the benthic vs pelagic pathways of production into the size-based model framework.  This work is an extension of Julia’s earlier work with benthic spectra.  Our aim is to make global assessment, and to that end we are working with Charlie Stock and Colleen Petrik.  The global model is a simplified version of the full size-spectrum model.

Best,

Ken

---------------------------------------------------------------------------------------------------------------

Ken H. Andersen, http://ken.haste.dk, twitter: @69kno

Professor in theoretical marine ecology, head of section, and deputy director of Centre for Ocean Life http://www.oceanlifecentre.dk

New paper:  Global patterns in marine predatory fish. Nature Ecology and Evolution 2, 65–70 (2018)

On 23 Oct 2018, at 20.57, 'Richard Law' via Size spectrum models <size-spectrum-models@googlegroups.com> wrote:

Just responding here to Asta's suggestion to find out what people are doing ...

There are several of us at the University of York UK interested in size, including Gustav Delius, Richard Southwell and Richard Law.

At the moment we're in an EU project (MINOUW) working towards technologies for reducing discards in European waters.  The part we play in this is to develop multispecies size-spectrum dynamics for modelling the effects of the landing obligation on marine ecosystems.  We're doing this on the Mizer platform, putting in place a shiny app to make it easier for practitioners to try out ideas.  In doing this, we've come up with a new way of constructing multispecies fish assemblages, to make sure that species known to live together in the sea, can also coexist in the models.  Currently we're working with Silvia De Juan (Instituto de Ciencias del Mar IMC-CSIC, Barcelona), to test this approach on shelf ecosystems in the Western Mediterranean.

We're also interested in questions about evolution in multispecies size spectra.  This includes some work that Richard Law and Mike Plank (University of Canterbury NZ) have recently done to bring techniques of adaptive dynamics and size-spectrum dynamics together.  From this, you can see how fisheries-induced evolution might proceed under different schemes of fishing, allowing for the underlying interactions in the food web.  It's available at: R Law and M J Plank (2018)  Balanced harvesting could reduce fisheries-induced evolution; Fish and Fisheries DOI: 10.1111/faf.12313  This is just the tip of the iceberg: there's much to explore in this field.

We're also working with Mariella Canales (Center of Applied Ecology and Sustainability CAPES, Pontifical Catholic University of Chile, Santiago) using size-based methods for two problems in the Northern Chile Marine Ecosystem: (1) the absence of clear stock-recruitment relationships in anchovy and sardine, and (2) the consequences of changing fishing mortality on the pelagic fish assemblage.

Our work tends to be at the interface of applied maths, computation and theoretical ecology.  We're always pleased to develop research with people who have real-world problems to solve in size-based marine ecosystems: this helps to keep our work 'grounded'.  The theory is fun too, for those who are interested!

Richard Law.

--
********************************************************************

Richard Law

York Cross-disciplinary Centre for Systems Analysis (YCCSA)
Ron Cooke Hub
University of York
York
YO10 5GE
UK

Phone +44 1904 325372
********************************************************************

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