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Category Archives: Uncategorized

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Declining productivity of cod stocks

Lab News Archive Uncategorized

Productivity is a central determinant of population dynamics with consequences for population viability, resilience to exploitation, and extinction. In fish, the strength of a cohort is typically established during early life stages. Traditional approaches to measuring productivity do not allow for interannual variation in the maximum reproductive rate, a parameter governing population productivity. Allowing such process variation provides the ability to track dynamic changes instead of assuming a static productivity regime. Here we develop and evaluate a multivariate stock–recruitment state-space model to simultaneously estimate time-varying stock productivity and synchronicity of dynamics across populations.

May 27, 2014
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Long-term trends in ocean chlorophyll

Uncategorized

Marine phytoplankton account for approximately half of the production of organic matter on earth, support virtually all marine ecosystems, constrain fisheries yields, and influence climate and weather. Despite this importance, long-term trajectories of phytoplankton abundance or biomass are difficult to estimate, and the extent of changes is unresolved. Here, we use a new, publicly-available database of historical shipboard oceanographic measurements to estimate long-term changes in chlorophyll concentration from 1890 to 2010.

May 27, 2014
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NSERC Presents 2 Minutes with Boris Worm

Uncategorized

Dalhousie University’s Boris Worm combines oceanography and marine biology to paint a more complete picture of what’s happening under the waves. Comprehensive information about the state of the oceans leads to better fisheries management, which benefits the environment, the economy and society as a whole.

May 25, 2014
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Overfishing in a nutshell

Overfishing in a nutshell

Uncategorized

Despite being the world’s largest rays and providing significant revenue through dive tourism, little is known about the population status, exploitation and trade volume of the Mobulidae (mobulids; Manta and Mobula spp.). There is anecdotal evidence, however, that mobulid populations are declining.

April 29, 2014
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  • Think globally, act locally and #keepthebacklandswild Please help us save a unique wilderness area close to… https://t.co/YMHsJ6bOsD44 days ago
  • RT @OceanSchoolNow: Knowing and understanding our connection to the ocean is important for us all, no matter where we live! Learn more abou…104 days ago
  • The totally amazing discovery of a 60-million strong icefish nesting colony in Antarctica. How much better does it… https://t.co/sZ0zTcAFqx160 days ago
  • RT @Mainstreethfx: After the 4pm news... another marvel of evolution! Our oceans guy Boris Worm tells Jeff about the discovery of 60-millio…161 days ago
  • Very thought-provoking article on #scienceliteracy and what it means for our daily lives. Quote: "most of what you… https://t.co/kYkzqsHHBx170 days ago
  • Warmer, oxygen-poor waters may reduce productivity of world’s largest fishery - new study in Science https://t.co/MIzOrmITDm via @Mongabay174 days ago
Read More from Dr. Worm @CBCOceansGuy
  • Biology Department, Dalhousie University, Halifax, NS
  • |
    • Boris Worm -
    • (902) 494-2478
    • bworm@dal.ca