Publications

The Adequacy of purposes for data: a paleoecological case study

Abstract: According to the “adequacy-for-purpose” view of data evaluation, data should be evaluated as better or worse relative to a given research purpose and corresponding research context. In this paper, I apply the adequacy-for-purpose view to a novel case study—concerning the use of paleoecological data to make predictions about coral reef response to contemporary climate change—and then use the case study to suggest two extensions to the adequacy-for-purpose view. First, I argue that we can evaluate research purposes according to their productivity (how well these research purposes serve other, more ultimate purposes). Second, I argue that we can also evaluate research purposes according to their plausibility (including whether we have access to data that are adequate for these research purposes). The relationship between data evaluation and purpose setting should be seen as an iterative one, in which both data and purposes are refined in concert over time.

Published 2024 in Synthese

Paleoclimate Proxies and the Benefits of Disunity

Abstract: Measuring the climates of the deep past requires the use of paleoclimate proxies. I describe two proxy data and measurement practices, regarding proxy calibration and proxy data infrastructure. I document how at least some data and measurement practices in paleoclimatology are disunified: these practices do not involve intercalibration or otherwise statistical combination of multiple proxy records, and metadata necessary for proxy data to be reused or intercompared is often not provided. I argue that, perhaps counterintuitively, this lack of standardization and unification of proxy data and measurements has several benefits, especially related to the management of error and uncertainty.

Published 2024 in Philosophy of Science

What is philosophy of the geosciences?

Coauthored with Miguel Ohnesorge.

Abstract: The philosophy of the geosciences is an emerging subfield in philosophy of science. Although past and present geoscientific disciplines differ substantially, we argue that they frequently face common epistemological and ethical problems. We survey several of these problems that have already attracted sustained philosophical interest, related to the use of measurements, data, and models to study relatively inaccessible target phenomena, responses to (epistemic) injustices, and the management of epistemic risks.

Published in 2024 in Philosophy Compass

Androcentrism in biological typing

Abstract: Biological types, including holotypes and reference genomes, are particular biological entities that represent an entire class of biological entities. This paper presents a feminist analysis of biological typing by asking whether we have reason to criticize the practices of selecting holotypes and reference genomes for being androcentric. I offer three distinct reasons why androcentrism can be objectionable: androcentric practices may inadequately account for traits or experiences of women/females, reinforce male/female dichotomies, or overgeneralize from particulars. I then evaluate whether the practices of selecting holotypes and genomes are objectionably androcentric in these three ways. These typing practices, especially as applied to the case of humans, are objectionably androcentric in some ways but not others. Whether a typing practice problematically ignores the traits or experiences of women depends on whether the typing practice involves non-accidentally taking the traits or experiences of male humans as typical, which, I argue, is true both in the case of holotypes and genomes. Neither holotypes nor genomes reinforce male/female dichotomies, although some features of these practices may appear to do so. Finally, both holotypes and genomes are criticizable for overgeneralizing from particulars, although this criticism does not depend on these practices being androcentric.

Published in Hypatia in 2024

Using Paleoclimate Analogues to Inform Climate Projections

Abstract: Philosophers of science have paid close attention to climate simulations as means of projecting the severity and effects of climate change, but have neglected the full diversity of methods in climate science. This paper shows the philosophical richness of another method in climate science: the practice of using paleoclimate analogues to inform our climate projections. First, I argue that the use of paleoclimate analogues can offer important insights to philosophers of the historical sciences. Rather than using the present as a guide to the past, as is common in the historical sciences, paleoclimate analogues involve using the past as a guide to the future. I thereby distinguish different methods in the historical sciences and argue that these distinctions bear on debates over whether the historical sciences can produce generalizations or predictions. Second, I suggest that paleoclimate analogues might actually be considered a type of climate model, and, as such, their use expands on common characterizations of models to include those that are full-scale, naturally occurring, and non-manipulable.

Published 2023 in Perspectives on Science.

Scaling procedures in climate science: Using temporal scaling to identify a paleoclimate analogue

Abstract: Using past episodes of climate change as a source of evidence to inform our projections about contemporary climate change requires establishing the extent to which episodes in the deep past are analogous to the current crisis. However, many scientists claim that contemporary rates of climate change (e.g., rates of carbon emissions or temperature change) are unprecedented, including compared to episodes in the deep past. If so, this would limit the utility of paleoclimate analogues. In this paper, I show how a data adjustment procedure called “temporal scaling,” which must be applied to both contemporary and past rate data, complicates the claim that contemporary rates are truly unprecedented. On top of giving actionable recommendations to scientists, this paper advances the philosophical literature concerning the use of models that are known to be somewhat disanalogous to their target systems.

Published 2023 in Studies in History and Philosophy of Science.

Are We in a Sixth Mass Extinction? The Challenges of Answering and Value of Asking

Coauthored with Federica Bocchi, Alisa Bokulich, Leticia Castillo Brache, and Gloria Grand-Pierre.

Abstract: In both scientific and popular circles it is often said that we are in the midst of a sixth mass extinction. Although the urgency of our present environmental crises is not in doubt, such claims of a present mass extinction are highly controversial scientifically. Our aims are, first, to get to the bottom of this scientific debate by shedding philosophical light on the many conceptual and methodological challenges involved in answering this scientific question, and, second, to offer new philosophical perspectives on what the value of asking this question has been — and whether that value persists today. We show that the conceptual challenges in defining ‘mass extinction’, uncertainties in past and present diversity assessments, and data incommensurabilities undermine a straightforward answer to the question of whether we are in, or entering, a sixth mass extinction today. More broadly we argue that an excessive focus on the mass extinction framing can be misleading for present conservation efforts and may lead us to miss out on the many other valuable insights that Earth’s deep time can offer in guiding our future.

Published 2022 in The British Journal for the Philosophy of Science.

Multi-Model Approaches to Phylogenetics: Implications for Idealization

Abstract: Phylogenetic models traditionally represent the history of life as having a strictly-branching tree structure. However, it is becoming increasingly clear that the history of life is often not strictly-branching; lateral gene transfer, endosymbiosis, and hybridization, for example, can all produce lateral branching events. There is thus motivation to allow phylogenetic models to have a reticulate structure. One proposal involves the reconciliation of genealogical discordance. Briefly, this method involves using patterns of disagreement -- discordance -- between trees of different genes to add lateral branching events to phylogenetic trees of taxa, and to estimate the most likely cause of these events. I use this practice to argue for: (1) a need for expanded accounts of multiple-models idealization, (2) a distinction between automatic and manual de-idealization, and (3) recognition that idealization may serve the meso-level aims of science in a different way than hitherto acknowledged.

Published 2021 in Studies in History and Philosophy of Science.

Development and Microbiology

Abstract: On the basis of findings from developmental biology, some researchers have argued that evolutionary theory needs to be significantly updated. Advocates of such a ``developmental update" have, among other things, suggested that we need to re-conceptualize units of selection, that we should expand our view of inheritance to include environmental as well as genetic and epigenetic factors, that we should think of organisms and their environment as involved in reciprocal causation, and that we should reevaluate the rates of evolutionary change. However, many of these same conclusions could be reached on the basis of other evidence, namely from microbiology. In this paper, I ask why microbiological evidence has not had a similarly large influence on calls to update biological theory, and argue that there is no principled reason to focus on developmental as opposed to microbiological evidence in support of these revisions to evolutionary theory. I suggest that the focus on developmental biology is more likely attributable to historical accident. I will also discuss some possible room for overlap between developmental and microbiology, despite the historical separation of these two subdisciplines.

Published 2021 in Biology & Philosophy.

Reevaluating the Grandmother Hypothesis

Abstract: Menopause is an evolutionary mystery: how could living longer with no capacity to reproduce possibly be advantageous? Several explanations have been offered for why female humans, unlike our closest primate relatives, have such an extensive post-reproductive lifespan. Proponents of the so-called “grandmother hypothesis” suggest that older women are able to increase their fitness by helping to care for their grandchildren as allomothers. This paper first distinguishes the grandmother hypothesis from several other hypotheses that attempt to explain menopause, and then develops a formal model by which these hypotheses can be compared and tested by empirical researchers. The model is then modified and used to respond to a common objection to the grandmother hypothesis: that human fathers, rather than grandmothers, are better suited to be allomothers due to their physical strength and a high incentive to invest in their own children. However, fathers - unlike maternal grandmothers - can never be sure that the children they are caring for are their own. Incorporating paternity uncertainty into the model demonstrates the conditions under which the grandmother hypothesis is more plausible than a hypothesis that focuses on the contributions of men.

Published 2021 in History and Philosophy of the Life Sciences.

The Epistemic Value of the Living Fossils Concept

Abstract: Living fossils, taxa with similar members now and in the deep past, have recently come under scrutiny. Those who think the concept should be retained have argued for its epistemic and normative utility. This paper extends the epistemic utility of the living fossils concept to include ways in which a taxon's living fossil status can serve as evidence for other claims about that taxon. I will use insights from developmental biology to refine these claims. Insofar as these considerations demonstrate the epistemic utility of the living fossils concept, they support retaining the concept and using it in biological research.

Published 2021 in Philosophy of Science.

Testing for Phenotypic Plasticity

Abstract: Phenotypic plasticity, or an organism’s capacity to change its phenotype in response to environmental variation, is a pervasive—perhaps even ubiquitous—feature of the biological world. However, the empirical evidence for particular instances of plasticity has still not been adequately scrutinized by biologists or philosophers. This paper synthesizes some past discussions of the methodology of plasticity studies and provides some novel methodological guidance for plasticity researchers. My conclusion is that not all plasticity studies should carry the same weight: there are patterns we can identify in the features of such studies that should contribute to (or detract from) their credibility.

Published 2020 in Philosophy, Theory, and Practice in Biology.

Pathogen versus microbiome causation in the holobiont

Abstract: This is a commentary on a paper by Lynch, Parke, and O’Malley about microbiome causation, coauthored with Federica Bocchi. We question the assumption that parasitic microbes and microbiomes fall under the same causal framework. First, we introduce the historical circumstances that led to the formulation of Koch’s postulates in order to differentiate the case of the microbiome from that of infectious bacteria. Then, we review the concept of the holobiont, the idea that hosts and their symbionts should be conceptualized as a metaphysical and biological unit. Finally, using the holobiont concept, we argue that Koch’s postulates and the interventionist framework are ill-equipped to handle the microbiome. We conclude by suggesting that a revision of what counts as microbiological causality within the holobiont is justified.

Published 2020 in Biology & Philosophy.