This paper adopts a symmetrical approach tocontroversies over R.H. MacArthur and E.O. Wilson'sequilibrium model of island biogeography, in order toshow how different interpretations of the model dependupon different philosophical understandings of theapplication of models and theories. In particular,there are quite distinct domains to which the modelcould apply; in addition, some equivocation amongthese domains is important to the model's success.Therefore, apparently inconsistent interpretations,interpretations that fit into roughly instrumentalist,realist and rationalist conceptions of science, may bemutually supporting in practice. Descriptions ofscientific practice, (...) then, should not adjudicate amongthese interpretations, but should instead recognizeways in which successful models translate amongdomains, and in so doing can become realistic,instrumentally successful, or rationally established.As complex social objects, models can afford complexrepresentational relations. (shrink)

Biogeography is a multidisciplinary field with multiple origins in 19th century taxonomic practice. The Origins of Biogeography presents a revised history of early biogeography and investigates the split in taxonomic practice, between the classification of taxa and the classification of vegetation. This book moves beyond the traditional belief that biogeography is born from a synthesis of Darwin and Wallace and focuses on the important pioneering work of earlier practitioners such as Zimmermann, Stromeyer, de Candolle and Humboldt. (...) Tracing the academic history of biogeography over the decades and centuries, this book recounts the early schisms in phyto and zoogeography, the shedding of its bonds to taxonomy, its adoption of an ecological framework, and its beginnings at the dawn of the 20th century. This book assesses the contributions of key figures such as Zimmermann, Humboldt and Wallace, and reminds us of the forgotten influence of plant and animal geographers including Stromeyer, Prichard and de Candolle, whose early attempts at classifying animal and plant geography would inform later progress. The Origins of Biogeography is a science historiography aimed at biogeographers, who have little access to a detailed history of the practices of early plant and animal geographers. This book will also reveal how biological classification has shaped 18th and 19th century plant and animal geography and why it is relevant to the 21st biogeographer. (shrink)

Emotivism has enjoined a revival of sorts over the past few decades, primarily driven by a Darwinian interpretation of the Humean metaethic. Evolutionary ethics, the metaethical view that at the heart of our moral sense lies a set of moral sentiments whose existence 'pre-dates' in evolutionary terms our species' ability to engage in more explicit, cognitive moral deliberations and discourse, whether in the discovery of deontological rules or in the crafting of social contracts, figures prominently in Robert Solomon's work in (...) justice theory and J. Baird Callicott's work in environmental ethics, to name just two efforts to revive emotivism. Though the idea that our moral sense is grounded in our evolved biology lies at the heart of the new ethical emotivism, there has been a curious lack of a truly evolutionary account of the origin of that biological predisposition in the work of Solomon, Callicott, and others involved in the revival. In particular, what is missing is an account of how we evolved our moral sense as an adaptation to the ecology in which our very early ancestors existed. The typical explanation is to treat it as selected for by the pressure to cooperate that bore upon our early ancestors; for example, the advantage that cooperative effort confers in bringing down big game or warding off competing groups. But this type of explanation, I hope to show, rather than providing an account of how our moral sense came to be, actually must presuppose the existence of a rudimentary moral sense. If so, then the origin of our moral sense must be accounted for as an adaptation to our pre-social, ecological environment. As a model for what such an explanation might look like I will use Jared Diamond's recent work in biogeography, Guns, Germs and Steel. (shrink)

When Kangas suggested in 1986 that wildlife reserve designs could be much smaller than previously thought, community ecologists attacked his views on methodological grounds (island biogeographical theory is beset with uncertainties) and on conservation grounds (Kangas seemed to encourage deforestation and extinction). Kangas' defenders, like Simberloff, argued that in a situation of biological uncertainty (the degree/type of deforestation-induced extinction), scientists ought to follow the epistemologically conservative course and risk type-II error (the risk of not rejecting a null hypothesis that is (...) false), rather than type-I error. (This is the risk of rejecting a null hypothesis that is true). Kangas' opponents, like Noss, argued that, in a situation of scientific uncertainty, scientists ought to risk type-I, rather than type-II, error. This essay argues that there are different types of rationality appropriate to science and applied science and, therefore, in cases of applied science (like conservation biology), the more conservative course of action is for scientists to risk type-I error. The essay argues further that, on grounds of scientific rationality, Kangas, Simberloff, and others were correct in risking type-II error, but that, on grounds of decision-theoretic rationality, Noss, Waide, and others were correct in risking type-I error. (shrink)

In 1986-1987, a number of ecologists were involved in a dispute over design of wildlife reserves and species losses resulting from deforestation. The battle was played out largely in the pages of the Ecological Society of America Bulletin. The most focused aspect of the controversy began in August 1986 when P. C. Kangas gave a paper at the meetings of the Fourth International Congress of Ecology, held in Syracuse, New York.Using data on trees in Costa Rica and the “objective approach” (...) of species-area curves, Kangas argued that extinction rates due to deforestation in the tropics are actually much lower than most other researchers have alleged (Kangas 1986, p. 194). Ecologists in the audience disagreed with Kangas’ claim that extinction rates were indeed lower, complained that his questionable results would be used to justify more rapid and widespread deforestation, and claimed to have “sharply trounced his [Kangas’] arguments” (Noss 1986, pp. 278-279). (shrink)

This paper addresses the job shop scheduling problem including time lag constraints. This is an extension of the job shop scheduling problem with many applications in real production environments, where extra delays can be introduced between successive operations of the same job. It belongs to a category of problems known as NP-hard problem due to large solution space. Biogeography-based optimization is an evolutionary algorithm which is inspired by the migration of species between habitats, recently proposed by Simon in 2008 (...) to optimize hard combinatorial optimization problems. We propose a hybrid biogeography-based optimization algorithm for solving the job shop scheduling problem with additional time lag constraints with minimization of total completion time. In the proposed HBBO, the effective greedy constructive heuristic is adapted to generate the initial population of habitat. Moreover, a local search metaheuristic is investigated in the mutation step in order to ameliorate the solution quality and enhance the diversity of the population. To assess the performance of HBBO, a series of experiments on well-known benchmark instances for job shop scheduling problem with time lag constraints is performed. (shrink)

Philosophers of science have examined The Theory of Island Biogeography by Robert MacArthur and E. O. Wilson (1967) mainly due to its important contribution to modeling in ecology, but they have not examined it as a representative case of ecological explanation. In this paper, I scrutinize the type of explanation used in this paradigmatic work of ecology. I describe the philosophy of science of MacArthur and Wilson and show that it is mechanistic. Based on this account and in light (...) of contributions to the mechanistic conception of explanation due to Craver (2007), and Bechtel and Richardson (1993), I argue that MacArthur and Wilson use a mechanistic approach to explain the species-area relationship. In light of this examination, I formulate a normative account of mechanistic explanation in ecology. Furthermore, I argue that it offers a basis for methodological unification of ecology and solves a dispute on the nature of ecology. Lastly, I show that proposals for a new paradigm of biogeography appear to maintain the norms of mechanistic explanation implicit in The Theory of Island Biogeography. (shrink)

We performed a critical review of the historiographical studies on biogeography. We began with the pioneering works of Augustin and Alphonse de Candolle. Then, we analyzed the historical accounts of biogeography developed by (1) Martin Fichman and his history on the extensionism-permanentism debate; (2) Gareth Nelson and his critique of the Neo-Darwinian historiography of biogeography; (3) Ernst Mayr, with his dispersalist viewpoint; (4) Alan Richardson, who wrote a microhistory on the biogeographic model constructed by Darwin; (5) Michael (...) Paul Kinch and the ideas discussed in the 19th century about the geographical distribution of living beings; (6) Janet Browne, who highlighted the importance of the pre-Darwinian naturalists; (7) Peter Bowler, who focused mainly on the influence of paleontology on biogeography; (8) James Larson, who looked into the practices of the naturalists of Northern Europe in the late 18th century; and (9) Malte Ebach, who like Larson, was more interested in analysing the practices rather than the ideas of naturalists who studied the geographical distribution of organisms. Finally, these works are compared with each other. There has not been a dominant paradigm in the construction of historical narratives of biogeography; however, they provide a useful context for understanding problems of biogeography that continue to be debated to this day. (shrink)

Economic dispatch plays an important role in power system operation, since it can decrease the operating cost, save energy resources, and reduce environmental load. This paper presents an improved particle swarm optimization called biogeography-based learning particle swarm optimization for solving the ED problems involving different equality and inequality constraints, such as power balance, prohibited operating zones, and ramp-rate limits. In the proposed BLPSO, a biogeography-based learning strategy is employed in which particles learn from each other based on the (...) quality of their personal best positions, and thus it can provide a more efficient balance between exploration and exploitation. The proposed BLPSO is applied to solve five ED problems and compared with other optimization techniques in the literature. Experimental results demonstrate that the BLPSO is a promising approach for solving the ED problems. (shrink)

This paper dwells on the debate on the question of what is/are responsible for African underdevelopment and, by extension, what will influence African development. The debate currently dwells on how much of development is human and how much is environmental, extraneous and beyond human control. Joseph Agbakoba thinks that development involves both nature and human agency, acknowledges the effect of nature, equally sees philosophy as a critique of worldview and ideology, and African philosophy as saddled with the critique of the (...) African worldview and ideology, which he sees as malfunctioning in the context of the modern African civic society imported from Europe and needs certain adjustments. In other words, he sees development in Africa as not beyond human control. J. Obi Oguejiofor attempts to refute Agbakoba’s claim that worldview has anything to do with the African predicament, and concludes that the African predicament is as a result of geography, biogeography and history, but his advancement of these factors as being solely responsible for the African predicament completely ignores the human agency in development and lands him in determinism raising the question of the very relevance of African philosophy to African development. Conceptual analysis informs the dominant method of the paper. (shrink)

C. J. Temminck, director of the Rijksmuseum van Natuurlijke Historie and a renowned ornithologist, gained his contemporary's respect thanks to the description of many new species and to his detailed monographs on birds. He also published a small number of works on biogeography describing the fauna of the Dutch colonies in South East Asia and Japan. These works are remarkable for two reasons. First, in them Temminck accurately described the species composition of poorly explored regions, like the Sunda Islands (...) and Japan. Secondly, he formulated a new law on the geographical distribution of animals around the globe, based on the parallels he observed between the fauna from Europe, Asia and Japan. The underlying ideas that lead Temminck to this law were the typeconcept, which he understood as the ideal morphological plan behind animal form, the unchanging character of the species and a strong belief in nature's divine design. During the first half of the nineteenth century, the type-and the species-concept, the origin and fixity of the species and the meaning of variations aroused heated discussions. When put in the context of his time, Temminck emerges as a scientist whose work was driven by the dominating scientific philosophy of the time in which he lived, under the influence of late eighteenth century natural history and of French empiricists, in particular, the great zoologist and paleontologist Georges Cuvier. Temminck's detailed descriptions of the Dutch East Indian fauna helped the great naturalists after him to understand nature's patterns and to propose comprehensive theories that explain its diversity. (shrink)

The biogeographic contributions of Léon Croizat (1894–1982) and the conflictive relationships with his intellectual descendants and critics are analysed. Croizat’s panbiogeography assumed that vicariance is the most important biogeographic process and that dispersal does not contribute to biogeographic patterns. Dispersalist biogeographers criticized or avoided mentioning panbiogeography, especially in the context of the “hardening” of the Modern Synthesis. Researchers at the American Museum of Natural History associated panbiogeography with Hennig’s phylogenetic systematics, creating cladistic biogeography. On the other hand, a group (...) of New Zealand biologists formalized Croizat’s original concepts and soon began arguing with cladistic biogeographers over the relative merits of their approaches. In Latin America, panbiogeography and cladistic biogeography were incorporated as parts of an integrative approach. A recent development, molecular panbiogeography, is based on the use of molecular phylogenetic data. The current practice shows that some authors insist on considering panbiogeography as the only appropriate approach and vicariance as the only relevant process, whereas others accept Croizat’s dictum “Earth and life evolve together” as a useful guide to understanding broad, general patterns, but recognize that dispersal also contributes substantially to biotic assembly. The framework of integrative pluralism allows to explain the complexities of the biogeographic processes involved in biotic assembly without the need of unification on a large scale. This historical analysis intersects with the existing historiography of the Modern Synthesis and may provide some insights on the dynamics of integrative pluralism, which may be especially relevant in the current development of the Extended Synthesis. (shrink)

Path selection is one of the key technologies of wireless sensor network. A reasonable choice of coverage path can improve the service quality of WSN and extend the life cycle of WSN. Biogeography-based optimization is widely used in the field of cluster intelligent optimization because its search method has a better incentive mechanism for population evolution. In this paper, the move-in and move-out operation and mutation operation of the BBO algorithm enable WSN to find an efficient routing path. In (...) this paper, simulation experiments are carried out in two scenarios of regular deployment and random deployment of WSN nodes. The experimental results show that the quality of the WSN coverage path solution optimized by the BBO algorithm in the two scenarios is better than that of the particle swarm algorithm and genetic algorithm. (shrink)

Advances in technology have increased our knowledge of the processes that effect genomic changes and of the roles of RNA networks in biocommunication, functionality, and evolution of genomes. Natural genetic engineering and genomic inscription occur at all levels of life: cell cycles, development, and evolution. This has implications for phylogenetic studies and for biogeography, particularly given the general acceptance of using molecular clocks as arbiters between vicariance and dispersal explanations in biogeography. Léon Croizat’s development of panbiogeography and his (...) explanation for the distribution patterns of organisms are based on concepts of dispersal, differential form-making, and ancestor that differ from concepts of descent used broadly in phylogenetic and biogeographic studies. Croizat’s differential form-making is consistent with the extensive roles ascribed to RNAs in development and evolution and recent discoveries of genome studies. Evolutionary-developmental biology (evo-devo), including epigenetics, and the role of RNAs should be incorporated into biogeography. (shrink)

Great progress to digitize the world’s available Biodiversity and Biogeography data have been made recently, but managing data from many different providers and research domains still remains a challenge. A review of the current landscape of metadata standards and ontologies in Biodiversity sciences suggests that existing standards, such as the Darwin Core terminology, are inadequate for describing Biodiversity data in a semantically meaningful and computationally useful way. As a contribution to fill this gap, we present an ontology-based system, called (...) BiGe-Onto, designed to manage data together from Biodiversity and Biogeography. As data sources, we use two internationally recognized repositories: the Global Biodiversity Information Facility and the Ocean Biogeographic Information System. BiGe-Onto system is composed of BiGe-Onto Architecture a conceptual model called BiGe-Onto specified in OntoUML, an operational version of BiGe-Onto encoded in OWL 2, and an integrated dataset for its exploitation through a SPARQL endpoint. We will show use cases that allow researchers to answer questions that manage information from both domains. (shrink)

Climate and evolution represents an important contribution to evolutionary biogeography, that influenced several authors, notably Karl P. Schmidt, George S. Myers, George G. Simpson, Philip J. Darlington, Ernst Mayr, Thomas Barbour, John C. Poynton, Allen Keast, Léon Croizat, Robin Craw, Michael Heads, and Osvaldo A. Reig. Authors belonging to the “New York School of Zoogeography” –a research community including Matthew, Schmidt, Myers and Simpson– accepted Matthew’s “Holarcticism” and the permanence of ocean basins and continents, whereas others, especially panbiogeographers and (...) cladistic biogeographers, were extremely critical and reacted against these ideas. “Holarcticism” has been falsified and rejected by dispersalists and the “New York School of Zoogeography” disappeared in the 1970s. Matthew, however, continues being identified by panbiogeographers and cladistic biogeographers as a key representative of classic dispersalism, helping provide some cohesion to their research communities. (shrink)

Recent discoveries of geographical patterns in microbial distribution are undermining microbiology’s exclusively ecological explanations of biogeography and their fundamental assumption that ‘everything is everywhere: but the environment selects’. This statement was generally promulgated by Dutch microbiologist Martinus Wilhelm Beijerinck early in the twentieth century and specifically articulated in 1934 by his compatriot, Lourens G. M. Baas Becking. The persistence of this precept throughout twentieth-century microbiology raises a number of issues in relation to its formulation and widespread acceptance. This paper (...) will trace the conceptual history of Beijerinck’s claim that ‘everything is everywhere’ in relation to a more general account of its theoretical, experimental and institutional context. His principle also needs to be situated in relationship to plant and animal biogeography, which, this paper will argue, forms a continuum of thought with microbial biogeography. Finally, a brief overview of the contemporary microbiological research challenging ‘everything is everywhere’ reveals that philosophical issues from Beijerinck’s era of microbiology still provoke intense discussion in twenty-first century investigations of microbial biogeography. (shrink)

The Macarthur-Wilson equilibrium theory of island biogeography has had a contradictory role in ecology. As a lasting contribution, the theory has created a new way of viewing insular environments as dynamical systems. On the other hand, many of the applications of the theory have reduced to mere unimaginative curve-fitting. I analyze this paradox in semiotic terms: the theory was mainly equated with the simple species-area relationship which became a signifier of interesting island ecology. The theory is, however, better viewed (...) as a theoretical framework that suggests specific hypotheses on the ecology of colonization of insular environments. This paradox is inherent in the use of simplifying analytic models. Analytic models are necessary and fruitful in the work of ecologists, but they ought to be supplemented with a broader, pluralistic appreciation of the role of theories in general. (shrink)

This paper examines how the 19th-century British naturalist Alfred Russel Wallace used biogeographical mapping practices to draw a boundary line between Malay and Papuan groups in the colonial East Indies in the 1850s. Instead of looking for a continuous gradient of variation between Malays and Papuans, Wallace chose to look for a sharp discontinuity between them. While Wallace's "human biogeography" paralleled his similar project to map plant and animal distributions in the same region, he invoked distinctive "mental and moral" (...) features as more decisive than physical ones. By following Wallace in the field, we can see his field mapping practices in action -- how he conquered the problem of local particularity in the case of human variation. His experiences on the periphery of expanding European empires, far from metropolitan centers, shaped Wallace's observations in the field. Taking his cues from colonial racial categories and his experiences collaborating with local people in the field, Wallace constructed the boundary line between the Malay and Papuan races during several years of work in the field criss-crossing the archipelago as a scientific collector. This effort to map a boundary line in the field was a bold example of using the practices of survey science to raise the status of field work by combining fact gathering with higher-level generalizing, although the response back in the metropole was less than enthusiastic. Upon his return to Britain in the 1860s, Wallace found that appreciation for observational facts he had gathered in the field was not accompanied by agreement with his theoretical interpretations and methods for doing human biogeography. (shrink)

Habitat dioramas depicting ecological relations between organisms and their natural environments have become the preferred mode of museum display in most natural history museums in North America and Europe. Dioramas emerged in the late nineteenth century as an alternative mode of museum installation from taxonomically arranged cases. We suggest that this change was closely connected to the emergence of a biogeographical framework rooted in evolutionary theory and positing the existence of distinct biogeographical zones. We tie the history of dioramas to (...) earlier visual resources such as the thematic images that Wallace introduced to illustrate his 1876 Geographical Distribution of Animals. These images were unique in their time because each of them simultaneously depicted animals from several different taxa, rather than only one, as well as the ecological relations between animals and their habitats. Both, visually and with respect to their function within biogeography, these images presaged the habitat dioramas that came shortly afterwards. Not coincidentally, Wallace explicitly advocated the use of dioramas for museum display in ongoing debates on museum reform. Wallace 's suggestions were put into practice by committed evolutionists such as Gottlieb von Koch who pioneered the diorama installation in the Grand Ducal Museum in Darmstadt in 1906. As in Wallace 's illustrations, Koch's dioramas were designed to respresent biogeographical zones. This paper explores the function of these visual displays of biogeographical relations. It argues that, in both the scientific and public realms, biogeogaphical zones were defined and constructed by visual means; recourse to visual representation was more than a method of communication. (shrink)

C. J. Temminck, director of the Rijksmuseum van Natuurlijke Historie (now the National Museum of Natural History in Leiden) and a renowned ornithologist, gained his contemporary's respect thanks to the description of many new species and to his detailed monographs on birds. He also published a small number of works on biogeography describing the fauna of the Dutch colonies in South East Asia and Japan. These works are remarkable for two reasons. First, in them Temminck accurately described the species (...) composition of poorly explored regions, like the Sunda Islands and Japan. Secondly, he formulated a new law on the geographical distribution of animals around the globe, based on the parallels he observed between the fauna from Europe, Asia and Japan. The underlying ideas that lead Temminck to this law were the typeconcept, which he understood as the ideal morphological plan behind animal form, the unchanging character of the species and a strong belief in nature's divine design. During the first half of the nineteenth century, the type-and the species-concept, the origin and fixity of the species and the meaning of variations aroused heated discussions. When put in the context of his time, Temminck emerges as a scientist whose work was driven by the dominating scientific philosophy of the time in which he lived, under the influence of late eighteenth century natural history and of French empiricists, in particular, the great zoologist and paleontologist Georges Cuvier. Temminck's detailed descriptions of the Dutch East Indian fauna helped the great naturalists after him to understand nature's patterns and to propose comprehensive theories that explain its diversity. (shrink)

This paper examines how the 19th-century British naturalist Alfred Russel Wallace used biogeographical mapping practices to draw a boundary line between Malay and Papuan groups in the colonial East Indies in the 1850s. Instead of looking for a continuous gradient of variation between Malays and Papuans, Wallace chose to look for a sharp discontinuity between them. While Wallace's "human biogeography" paralleled his similar project to map plant and animal distributions in the same region, he invoked distinctive "mental and moral" (...) features as more decisive than physical ones. By following Wallace in the field, we can see his field mapping practices in action -- how he conquered the problem of local particularity in the case of human variation. His experiences on the periphery of expanding European empires, far from metropolitan centers, shaped Wallace's observations in the field. Taking his cues from colonial racial categories and his experiences collaborating with local people in the field, Wallace constructed the boundary line between the Malay and Papuan races during several years of work in the field criss-crossing the archipelago as a scientific collector. This effort to map a boundary line in the field was a bold example of using the practices of survey science to raise the status of field work by combining fact gathering with higher-level generalizing, although the response back in the metropole was less than enthusiastic. Upon his return to Britain in the 1860s, Wallace found that appreciation for observational facts he had gathered in the field was not accompanied by agreement with his theoretical interpretations and methods for doing human biogeography. (shrink)

The development of comparative biology has been of interest to philosophers and historians. Particular attention has been placed on the ‘war’ of the 1970s and 1980s, the apparent dispute among those who preferred this or that methodology. In this contribution we examine the history of comparative biology from the perspective of fundamentals rather than methodologies. Our examination is framed within the artificial—natural classification dichotomy, a viewpoint currently lost from view but worth resurrecting.

Ernst Mayr''s scientific career continues strongly 70 years after he published his first scientific paper in 1923. He is primarily a naturalist and ornithologist which has influenced his basic approach in science and later in philosophy and history of science. Mayr studied at the Natural History Museum in Berlin with Professor E. Stresemann, a leader in the most progressive school of avian systematics of the time. The contracts gained through Stresemann were central to Mayr''s participation in a three year expedition (...) to New Guinea and The Solomons, and the offer of a position in the Department of Ornithology, American Museum of Natural History, beginning in 1931. At the AMNH, Mayr was able to blend the best of the academic traditions of Europe with those of North America in developing a unified research program in biodiversity embracing systematics, biogeography and nomenclature. His tasks at the AMNH were to curate and study the huge collections amassed by the Whitney South Sea Expedition plus the just purchased Rothschild collection of birds. These studies provided Mayr with the empirical foundation essential for his 1942Systematics and the Origin of Species and his subsequent theoretical work in evolutionary biology as well as all his later work in the philosophy and history of science. Without a detailed understanding of Mayr''s empirical systematic and biogeographic work, one cannot possibly comprehend fully his immense contributions to evolutionary biology and his later analyses in the philosophy and history of science. (shrink)

Despite their diversity and ecological importance, many areas of the SAR—Stramenopila, Alveolata, and Rhizaria—clade are poorly understood as the majority of SAR species lack molecular data and only 5% of species are from well-sampled families. Here, we review and summarize the state of knowledge about the three major clades of SAR, describing the diversity within each clade and identifying synapomorphies when possible. We also assess the “dark area” of SAR: the morphologically described species that are missing molecular data. The majority (...) of molecular data for SAR lineages are characterized from marine samples and vertebrate hosts, highlighting the need for additional research effort in areas such as freshwater and terrestrial habitats and “non-vertebrate” hosts. We also describe the paucity of data on the biogeography of SAR species, and point to opportunities to illuminate diversity in this major eukaryotic clade. See also the video abstract here: https://youtu.be/_VUXqaX19Rw. Despite their diversity, abundance, and importance, fewer than 10% of the species within the SAR—Stramenopila, Alveolata, and Rhizaria—clade have been assessed using molecular tools. Only a small percentage of the molecular records contain information on ecology or have associate location data, indicating a tremendous dark area. (shrink)

As conservation biology has developed as a distinct discipline from ecology, conservation guidelines based on ecological theory have been largely cast aside in favor of theory-independent decision procedures for designing conservation reserves. I argue that this transition has failed to advance the field toward its aim of preserving biodiversity. The abandonment of island biogeography theory in favor of complementarity-based algorithms is a case in point. In what follows, I consider the four central objections raised against island biogeographic conservation guidelines, (...) arguing that they fail to undermine the credibility of this framework as a conservation tool. At best, these objections call for a more careful application of this framework to conservation problems, not its wholesale abandonment. At the same time, complementarily-based algorithms are biased in favor of networks of small reserves containing non-overlapping species. These conditions threaten to promote inbreeding depression, genetic drift and other factors that increase a population’s risk of extinction. Therefore, recent developments in the field of conservation biology have arguably not contributed to its ultimate aim of preserving the maximum amount of biodiversity in the long run. (shrink)

Within the last 20 years, the US has mounted amassive campaign against invasions bynon-indigenous species (NIS) such as zebramussels, kudzu, water hyacinths, and brown treesnakes. NIS have disrupted native ecosystemsand caused hundreds of billions of dollars ofannual damage. Many in the scientificcommunity say the problem of NIS is primarilypolitical and economic: getting governments toregulate powerful vested interests thatintroduce species through such vehicles asships' ballast water. This paper argues that,although politics and economics play a role,the problem is primarily one of scientificmethod. (...) Even if commercial interests werewilling to spend the necessary funds to controlNIS, and even if government were willing toregulate them, ecological theory is notadequate to provide clear direction for eithereffort. The paper argues there is nocomprehensive, predictive theory ofinvasibility, as part of a larger theory ofcommunity structure, that might guideecological decision making regarding NIS, andfor at least three reasons. (1) There is nofirm definition of NIS, native, exotic,and so on, and ecologists do not use the termsconsistently; as a result, biologists debatingvarious accounts of community structure andecological explanation often do not even makelogical contact with each other. (2) Thedominant theory used to understandinvasibility, island biogeography, has noprecise predictive power and is unable toclarify when NIS might promote biodiversity andwhen they might hinder it. (3) There are nofirm, empirical generalizations that revealwhen a colonizer or a NIS might be likely totake over a new environment, and when it mightnot succeed in doing so. As a result,scientists have only rough rules of thumb toshore up their arguments against NIS. Given theincompleteness of current ecological theory,the paper closes with several suggestions forways that study of NIS might enhanceunderstanding of basic commmunity structuresand vice versa. (shrink)

Despite their diversity and ecological importance, many areas of the SAR—Stramenopila, Alveolata, and Rhizaria—clade are poorly understood as the majority (90%) of SAR species lack molecular data and only 5% of species are from well‐sampled families. Here, we review and summarize the state of knowledge about the three major clades of SAR, describing the diversity within each clade and identifying synapomorphies when possible. We also assess the “dark area” of SAR: the morphologically described species that are missing molecular data. The (...) majority of molecular data for SAR lineages are characterized from marine samples and vertebrate hosts, highlighting the need for additional research effort in areas such as freshwater and terrestrial habitats and “non‐vertebrate” hosts. We also describe the paucity of data on the biogeography of SAR species, and point to opportunities to illuminate diversity in this major eukaryotic clade. (shrink)