Christopher X J. Jensen
Associate Professor, Pratt Institute

Eco 101: Carrying Capacity

Posted 25 Jan 2016 / 0

Fundamentally, carrying capacity is a measure of the maximum density of a particular population How many organisms of a particular species can an area support? What determines this maximum population density? The answer to these questions is captured by the ecological concept of carrying capacity. The carrying capacity tells us how many organisms of a particular species Read More

A Major Post, Carrying Capacity, Eco 101, MSCI-270, Ecology, MSCI-271, Ecology for Architects

Lev Ginzburg Fest: celebration of a “retirement”

Posted 17 Dec 2015 / 0

“Lev Ginzburg has retired”. For anyone who knows Lev, this combination of words does not make a whole lot of sense. Is it possible that such a lively and active scientist would hang up his yellow pad and pencil in order to put his feet up in some retirement community far away from the world Read More

A Major Post, Allometries, Biography, Carrying Capacity, Conferences, Conservation Biology, Ecological Modeling, Ecology, Evolutionary Modeling, Population Genetics, Population Growth, Science as a career, System Stability, Talks & Seminars

My first “Breeders, Propagators, & Creators” talk: next Friday at St. Francis College

Posted 04 Dec 2015 / 0

Next Friday, December 11th, at 3 pm I will be delivering a talk at St. Francis College entitled “Highly-creative baby-breeding idea propagators: what human (re)productive choices mean for the future of our species“. The talk is a synopsis of a large section of my book-in-progress¬†Breeders, Propagators, & Creators: Culture,¬†Biology, and the Future of Human Evolution. Read More

A Major Post, Behavior, Breeders, Propagators, & Creators, Carrying Capacity, Cultural Evolution, Evolution Education, Gene-Culture Coevolution, Human Evolution, Human Uniqueness, Intrinsic Growth Rate, Memetic Fitness, Natural Selection, Parenting, Population Growth, Public Outreach, Reproductive Fitness, Sex and Reproduction, Social Diversity

Did the population bombers drive China into cultural crisis?

Posted 05 Nov 2015 / 0

Image courtesy of Wikimedia Commons The Los Angeles Times “China drops its ‘one-child’ policy, now let’s ban the ‘population bomb’” Great op-ed that makes it really clear that impact is a function of not just the number of people on the earth but also the resources those people consume (affluence) and technologies used to produce Read More

A Minor Post, Activism, Belief, Breeders, Propagators, & Creators, Carrying Capacity, Cultural Evolution, Memetic Fitness, MSCI-271, Ecology for Architects, Population Growth, Population Pressure, Prediction, Public Policy, Web

China shifts a failed cultural policy designed to stabilize population

Posted 29 Oct 2015 / 1

The New York Times “China to End One-Child Policy, Allowing Families Two Children” This was a long time coming (see Mara’s Hvistendahl‘s great 2010 piece in Science Magazine for perspective), but the Chinese Communist Party has finally decided to replace its “one child policy” with a “two child policy”. From an evolutionary perspective, there is Read More

A Minor Post, Articles, Breeders, Propagators, & Creators, Carrying Capacity, Cultural Evolution, Economic sustainability, Economics, Ethics, Law, Population Growth, Population Pressure, Public Policy, Social Norms

I will speak about the tension between biological and cultural evolution at St. Francis College (December 11th, 2015 @ 3pm)

Posted 08 Oct 2015 / 0

I am excited to announce that I am scheduled to speak about the tension between biological and cultural evolution at Saint Francis College in Brooklyn Heights. The title of my talk is “Highly-creative baby-breeding idea propagators: what human (re)productive choices mean for the future of our species“, and it will provide a partial overview of Read More

A Major Post, Anthropogenic Change, Behavior, Breeders, Propagators, & Creators, Carrying Capacity, Cultural Evolution, Economics, Gene-Culture Coevolution, Human Evolution, Human Uniqueness, Parenting, Population Growth, Population Pressure, Psychology, Public Outreach, Reproductive Fitness, Resource Consumption, Sex and Reproduction, Sustainability

ECOmotion Studios on Hairston Smith Slobodkin and why the earth is green

Posted 06 Oct 2015 / 0

Here’s another fun and informative video from ECOmotion Studios. I thought that it was interesting how this short discussed the connection between decomposers and the eventual supply of oil, although I wonder if many viewers will gain enough information from this short video to fully understand this idea. The basic ideas behind Hairston-Smith-Slobodkin (HSS) are Read More

A Minor Post, Carrying Capacity, Community Ecology, Ecological Society of America, Film & Video, Film, Television, & Video, Predation, Science in Art & Design, Terrestrial

Carrying capacity — but not growth rate — varies with habitat quality (at least for moose)

Posted 17 Aug 2015 / 0

Ecosphere “Characterizing demographic parameters across environmental gradients: a case study with Ontario moose (Alces alces)” What I find interesting about this study — besides its unprecedented investigation of something that would seem pretty critical to basic conservation efforts — is what was and was not intuitive in its findings. Moose have higher carrying capacities where Read More

A Minor Post, Articles, Carrying Capacity, Community Ecology, Conservation Biology, Ecological Modeling, Habitat Destruction, Intrinsic Growth Rate, Parasitism, Population Growth, Sustainable Harvesting

Sadly, the Population Bombers (mostly) still don’t get it

Posted 03 Jul 2015 / 0

WNYC The Leonard Lopate Show “Is Human Overpopulation The Reason for Environmental Destruction?” In my Ecology for Architects class we do an activity (“Perspectives on Becoming Ecologically Sustainable“) that challenges my students to comprehensively consider our large-scale options for becoming sustainable. When we do the activity we have already done some ecological footprinting and discussed Read More

A Minor Post, Anthropogenic Change, Biodiversity Loss, Carrying Capacity, Climate Change, Habitat Destruction, Population Growth, Population Pressure, Sustainability

Why socially-progressive scientists should not make bets…

Posted 25 Jan 2014 / 0

NPR Morning Edition “A Bet, Five Metals And The Future Of The Planet” This is an excellent piece that encapsulates the argument between “population pessimists” and “technological optimists”, an argument that seems to have been won by the technologists. It is frustrating how much damage has been done by people like Paul Ehrlich. His overconfidence Read More

A Minor Post, Anthropogenic Change, Carrying Capacity, Conservation Biology, Economic sustainability, Economics, Ecosystem Services, Population Growth, Population Pressure, Public Policy, Radio & Podcasts, Resource Consumption, Sociology, Sustainability