Massimo Pigliucci’s research while affiliated with City College of New York and other places

Understanding the mechanisms that underlie plant invasions is critical for management and conservation of biodiversity. At the same time, invasive species also provide a unique opportunity to study rapid adaptation to complex environmental conditions. Using four replicate reciprocal transplant experiments across three habitats, we described patterns of phenotypic response and assessed the degree of local adaptation in knotweed populations. We found plants from beach habitats were generally smaller than plants from marsh and roadside habitats when grown in their home habitat. In the marsh habitat, marsh plants were generally larger than beach plants, but not different from roadside plants. There were no differences among plants grown in the roadside habitat. We found mixed evidence for local adaptation: plants from the marsh habitat had greater biomass in their “home” sites, while plants from beaches and roadsides had greater survival in their “home” sites compared to other plants. In sum, we found phenotypic differentiation and some support for the hypothesis of rapid local adaptation of plants from beach, marsh and roadside habitats. Identifying whether these patterns of differentiation result from genetic or heritable non-genetic mechanisms will require further work.

Understanding the mechanisms that underlie plant invasions is critical for management and conservation of biodiversity. At the same time, invasive species also provide a unique opportunity to study rapid adaptation to complex environmental conditions. Using four replicate reciprocal transplant experiments across three habitats, we described patterns of phenotypic response and assessed the degree of local adaptation in knotweed populations. We found plants from beach habitats were generally smaller than plants from marsh and roadside habitats when grown in their home habitat. In the marsh habitat, marsh plants were generally larger than beach plants, but not different from roadside plants. There were no differences among plants grown in the roadside habitat. We found mixed evidence for local adaptation: plants from the marsh habitat had greater biomass in their “home” sites, while plants from beaches and roadsides had greater survival in their “home” sites compared to other plants. In sum, we found phenotypic differentiation and some support for the hypothesis of rapid local adaptation of plants from beach, marsh and roadside habitats. Identifying whether these patterns of differentiation result from genetic or heritable non-genetic mechanisms will require further work.

PREMISE Many plant invaders like the Japanese knotweeds are thought to colonize new habitats with low genetic diversity. Such species provide an opportunity to study rapid adaptation to complex environmental conditions. METHODS Using replicate reciprocal transplants of clones across three habitats, we described patterns of phenotypic response and assessed degree of local adaptation. KEY RESULTS We found plants from beach habitats had decreased height, number of leaves, leaf area, and biomass allocation to roots and shoots compared to plants from marsh and roadside habitats when grown in their home habitat. In the marsh habitat, marsh plants were generally larger than beach plants, but not different from roadside plants. There were no differences among plants from different habitats grown in the roadside habitat. Despite this evidence of differentiation in beach and marsh habitats, we found mixed evidence for local adaptation. In their “home site” plants from the marsh habitat had greater biomass than plants from the beaches but not compared to plants from roadsides. Biomass comparisons in other habitats were either maladaptive or not significant. However, plants from the roadside had greater survival in their “home site” compared to foreign plants. There were no differences in survival in the other habitats. CONCLUSIONS We found phenotypic differentiation associated with habitats despite the low reported genetic diversity for these populations. Our results partially support the hypothesis of local adaptation in marsh and roadside habitats. Identifying whether these patterns of differentiation result from genetic or heritable non-genetic mechanisms will require further work.

Presenting philosophy properly, in a way that is clear and accessible to our target audience, is of paramount importance. In this essay I draw on my dual experience as a scientist and a philosopher (as well as science and philosophy communicator) to arrive at some general recommendations for good practice. Specifically, I discuss why presentation matters, whether a bad presentation style is a valid criticism of a philosopher’s work, how we may adapt our message to the variety of communication media available today, and what, if any, is the relationship between how we present and how we conceive of philosophy itself.

A decade ago, a landmark edited collection of essays made official the ongoing quest for an Extended Evolutionary Synthesis (EES), beyond the classic Modern Synthesis that took shape in the 1930s and ‘40s. When Evolution – The Extended Synthesis was published, research on epigenetic inheritance was at its onset, with the theory being far ahead of the empirical results. An important book, Evolution in Four Dimensions by Eva Jablonka and Marion Lamb, articulated the notion of multiple channels of inheritance, including genetic, epigenetic, behavioral, and symbolic. These multiple modes of inheriting information within the biosphere joined a number of other empirical findings and conceptual advances to articulate the early version of the EES. In the intervening decade, our empirical understanding of epigenetic inheritance has improved, so it seems that a reevaluation of where we are and where we may possibly be going, is in order. Progress is constrained by the fact that understanding systems of inheritance requires time-consuming experimental designs that incorporate multiple generations. Further, technological limitations have yet to be overcome and most of our understanding of genome level processes is still confined to model species. In this paper we discuss what we have learned so far about epigenetic inheritance and what developments are needed to make further progress. We conclude with a discussion of the current role of epigenetic inheritance in the EES, and how it has changed in the intervening decade.

This letter addresses the editorial decision to publish the article, “Research on group differences in intelligence: A defense of free inquiry” (Cofnas, 2020). Our letter points out several critical problems with Cofnas's article, which we believe should have either disqualified the manuscript upon submission or been addressed during the review process and resulted in substantial revisions.

It has been suggested that Gene Roddenberry, the creator of the original Star Trek series (TOS), more or less consciously built the equivalent of a philosophical argument in favor of Stoic philosophy by centering his story lines on the interacting and exquisitely complementary characters of Mr. Spock, Captain Kirk, and Doctor McCoy. Spock in particular was apparently purposefully meant by Roddenberry to represent Stoicism as he understood it. Modern practitioners of Stoicism, however, tend to see Spock as a “stoic” (lower-s) in the vernacular sense of the term: going through life constantly sporting a stiff upper lip and suppressing his emotions. I argue in this essay that, on the contrary, the evolution of Spock from the young officer serving on the Enterprise NCC-1701 to ambassador to the Romulans in the last movie based on TOS can be understood as the story of someone entering the path to sagehood in the Stoic sense. And yes, Stoicism definitely is about far more than stiff lips and the suppression of emotions.

All thinking human beings seek an answer to the question, What is the meaning of life? Herein are discussed answers to this question, drawing on various traditions, but especially from Stoicism.

Where can we turn to find the story of our lives-an existential roadmap that explains where we have come from, why we are here, and where we are headed? Must each of us discover meaning within the context of our individual lives, or are there universal sources of meaning that we can all access? Is there any relationship between living a meaningful life and the quality of our health and well-being? And how can we find meaning in the face of adversity and suffering? Neurologist Jay Lombard, philosophers Massimo Pigliucci and Michael Ruse, and author Emily Esfahani Smith shed light on these perennial questions in conversation with Steve Paulson, executive producer and host of To the Best of Our Knowledge.