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Abstract: Larval dispersal in marine species allows gene flow across broad expanses of pelagic ocean, and can potentially provide genetic cohesion within widespread species. However, genetic connectivity across discontinuous ranges spanning thousands of kilometers must also rely on the availability of intermediate habitat. Here, I use comparative phylogeography and coalescent modeling to explore the interplay between habitat requirements and gene flow in eight pelagically dispersing species. First, I test the hypothesis that periods of lowered sea levels during glacial maxima promoted allopatric differentiation across the Indonesian-Australian Archipelago by comparing phylogeographic patterns in six species co-distributed across this region. Mitochondrial COI datasets from all six species are discordant in the degree and location of genetic structure across the archipelago, ranging from near reciprocal monophyly to admixtures between divergent clades, to a nearly complete absence of structure. However, all six species show strong departures from the neutral Wright-Fisher model, and a coalescent model of demography suggests that each species has expanded its range in response to sea- level rise and restoration of habitat on the Sunda and Sahul shelves at the end of the Pleistocene. Discordant phylogeographic patterns among species may arise from different habitat requirements, which could determine the degree to which local populations were impacted by sea level fluctuations. I then examine genetic structure across the South Pacific in two species of amphidromous freshwater Neritid gastropods that have retained marine pelagically dispersing larvae. Results show surprisingly low levels of genetic structure among Western Pacific archipelagos, despite the rarity of their freshwater habitat. Finally, I compare gene flow across the South Pacific in marine and amphidromous Neritid gastropods to test the hypothesis that intermediate atoll stepping-stones facilitate genetic connectivity in the marine species. Under a model of the structured coalescent, all four species have high levels of gene flow in the Western Pacific. In the Central Pacific, where a biophysical model of larval dispersal predicts connectivity through atoll stepping-stones, gene flow was significantly lower in the marine species, and negligible in the amphidromous species.
Population Genetics and Microevolutionary Theory Explore the fundamentals of the biological implications of population genetic theory In the newly revised Second Edition of Population Genetics and Microevolutionary Theory, accomplished researcher and author Alan R. Templeton delivers a fulsome discussion of population genetics with coverage of exciting new developments in the field, including new discoveries in epigenetics and genome-wide studies. The book prepares students to successfully apply population genetics analytical tools by providing a solid foundation in microevolutionary theory. The book emphasizes that population structure forms the underlying template upon which quantitative genetics and natural selection operate and is a must-read for future population and evolutionary geneticists and those who wish to work in genetic epidemiology or conservation biology. You’ll learn about a wide array of topics, including quantitative genetics, the interactions of natural selection with other evolutionary forces, and selection in heterogeneous environments and age-structured populations. Appendices that cover genetic survey techniques and probability and statistics conclude the book. Readers will also benefit from the inclusion of: A thorough introduction to population genetics, including the scope of the subject, its premises, and the Hardy-Weinberg Model of Microevolution An exploration of systems of mating, including a treatment of the use of runs of homozygosity to show pedigree inbreeding in distant ancestors A practical discussion of genetic drift, including the use of effective sizes in conservation biology (with a discussion of African rhinos as an example) A concise examination of coalescence, including a treatment of the infinite sites model Perfect for graduate students in genetics and evolutionary biology programs and advanced undergraduate biology majors, Population Genetics and Microevolutionary Theory will also earn a place in the libraries of students taking courses in conservation biology, human genetics, bioinformatics, and genomics.
The Biogeography of the Australian North West Shelf provides the first assembly of existing information of the North West Shelf in terms of geological, oceanographic and climatological history and current understanding of such issues as biodiversity, connectivity, larval dispersal and speciation in the sea that determine the distribution patterns of its invertebrate fauna. It is intended as a source of information and ideas on the biota of the shelf and its evolutionary origins and affinities and the environmental drivers of species’ ecology and distribution and ecosystem function. Regulators and industry environmental managers worldwide, but especially on the resource-rich North West Shelf, are faced with having to make decisions without adequate information or understanding of conservation values or the factors that drive ecosystem processes and resilience in the face of increasing anthropogenic and natural change. This book will provide a resource of information and ideas and extensive references to issues of primary concern. It will provide a big-picture narrative, putting the marine biota into a geological, evolutionary, and regional biodiversity context. The first book to cover the major benthic habitats and physical and ecological condition of the North West Shelf of Australia Covers new information on geomorphology and biota of coral reefs and other invertebrate habitats that are key species and functional groups of the North West Shelf Introduces new ideas on biogeographic processes and patterns in tropical seas
This is the first book to provide a detailed treatment of the field of larval ecology. The 13 chapters use state-of-the-art reviews and critiques of nearly all of the major topics in this diverse and rapidly growing field. Topics include: patterns of larval diversity, reproductive energetics, spawning ecology, life history theory, larval feeding and nutrition, larval mortality, behavior and locomotion, larval transport, dispersal, population genetics, recruitment dynamics and larval evolution. Written by the leading new scientists in the field, chapters define the current state of larval ecology and outline the important questions for future research.
This book began life as a series of lectures given to second and third year undergraduates at Oxford University. These lectures were designed to give students insights as to how marine ecosystems functioned, how they were being affected by natural and human interventions, and how we might be able to conserve them and manage them sustainably for the good of people, both recreationally and economically. This book presents 10 chapters, beginning with principles of oceanography important to ecology, through discussions of the magnitude of marine biodiversity and the factors influencing it, the functioning of marine ecosystems at within trophic levels such as primary production, competition and dispersal, to different trophic level interactions such as herbivory, predation and parasitism. The final three chapters look at the more applied aspects of marine ecology, discussion fisheries, human impacts, and management and conservation. Other textbooks covering similar topics tend to treat the topics from the point of view of separate ecosystems, with chapters on reefs, rocks and deep sea. This book however is topic driven as described above, and each chapter makes full use of examples from all appropriate marine ecosystems. The book is illustrated throughout with many full colour diagrams and high quality photographs. The book is aimed at undergraduate and graduate students at colleges and universities, and it is hoped that the many examples from all over the world will provide global relevance and interest. Both authors have long experience of research and teaching in marine ecology. Martin Speight’s first degree was in marine zoology at UCNW Bangor, and he has taught marine ecology and conservation at Oxford for 25 years. His research students study tropical marine ecology from the Caribbean through East Africa to the Far East. Peter Henderson is a Senior Research Associate at the University of Oxford, and is Director of Pisces Conservation in the UK. He has worked on marine and freshwater fisheries, as well as ecological and economic impacts and exploitation of the sea in North and South America as well as Europe.
The Pacific is the last major world region to be discovered by humans. Although small in total land area, its numerous islands and archipelagoes with their startlingly diverse habitats and biotas, extend across a third of the globe. This revised edition of a popular text explores the diverse landforms, climates, and ecosystems of the Pacific island region. Multiple chapters, written by leading specialists, cover the environment, history, culture, population, and economy. The work includes new or completely revised chapters on gender, music, logging, development, education, urbanization, health, ocean resources, and tourism. Throughout two key issues are addressed: the exceptional environmental challenges and the demographic/economic/political challenges facing the region. Although modern technology and media and waves of continental tourists are fast eroding island cultures, the continuing resilience of Pacific island populations is apparent. This is the only contemporary text on the Pacific Islands that covers both environment and sociocultural issues and will thus be indispensable for any serious student of the region. Unlike other reviews, it treats the entirety of Oceania (with the exception of Australia) and is well illustrated with numerous photos and maps, including a regional atlas. Contributors: David Abbott, Dennis A. Ahlburg, Glenn Banks, John Barker, Geoffrey Bertram, David A. Chappell, William C. Clarke, John Connell, Ron Crocombe, Julie Cupples, Derrick Depledge, Colin Filer, Gerard J. Fryer, Patricia Fryer, Brenden S. Holland, E. Alison Kay, David M. Kennedy, Lamont Lindstrom, Rick Lumpkin, Harley I. Manner, Selina Tusitala Marsh, Nancy McDowell, Hamish A. McGowan, Frank McShane, Simon Milne, R. John Morrison, Dieter Mueller-Dombois, Stephen G. Nelson, Patrick D. Nunn, Michael R. Ogden, Andrew Pawley, Jean-Louis Rallu, Vina Ram-Bidesi, Moshe Rapaport, Annette Sachs Robertson, Richard Scaglion, Donovan Storey, Andrew P. Sturman, Lynne D. Talley, James P. Terry, Randolph R. Thaman, Frank R. Thomas, Caroline Vercoe, Terence Wesley-Smith, Paul Wolffram.
Marine Invertebrate Evolution in the Galapagos Islands MATTHEW J. JAMES 1. Perspective of This Volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2. Directions for Future Research . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 3. Plan of This Volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1. Perspective of This Volume Charles Darwin brought the Galapagos Islands to the attention of zoologists, botanists, and geologists following the six-week visit of H. M. S. Beagle to the islands in 1835. Since then published research on the biota of the islands, partic ularly in multiauthored volumes, has focused on terrestrial plants and animals. The present volume is designed specifically to provide a summary of work on the marine invertebrate fauna. One deviation from that objective was the inclusion of a chapter on land snails, which proved to be a good choice because the phylum Mollusca is now covered more thoroughly in this volume than in any single previous scholarly work on the Galapagos. The academic bottom line with this book is to elucidate the evolutionary responses of shallow water, benthic marine invertebrates to the unique set of insular conditions that exist in the Galapagos Islands. The route taken to that objective has many paths including taxonomic revision, determining biogeo graphic affinities, and examining the ecological requirements of species. The information presented here is for some groups from the islands the first stage in a thorough process that can eventually lead to an understanding of the phylogenetic relationships of these species.
Biogeography and Evolution in New Zealand provides the first in-depth treatment of the biogeography of New Zealand, a region that has been a place of long-enduring interest to ecologists, evolutionary scientists, geographers, geologists, and scientists in related disciplines. It serves as a key addition to the contemporary discussion on regionalization—how is New Zealand different from the rest of the world? With what other areas does it share its geology, history, and biota? Do new molecular phylogenies show that New Zealand may be seen as a biological ‘parallel universe’ within global evolution?