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"Endangered species History."
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The animal game : searching for wildness at the American zoo
Over the twentieth century, as wild, tropical animals became familiar attractions in urban American zoos, they became rare in the wild. Americans who made zoos the nation's most popular attractions, developed closer knowledge of tropical animals, especially those from regions colonized by American and European powers. Founded as a living taxonomy of exotic nature, such zoos never achieved the biological and social order their founders so cherished. Workers, animals, and visitors did not behave in ways that matched zoo officials' or founders' visions. Tourists fed the animals, littered, even poached. They sought tales of animal adventure more than science lessons. This book examines the development of zoos and the animal trade that supplied them and how they were both buffeted by global politics, imperialism, revolution, and war. Through the paradox of animals that were endangered yet familiar and entwined in our daily lives, \"Animal Empire\" fosters a dialogue between those charged with conserving the future, those concerned about the effects of the past, and those who gaze at zoo animals and wonder about places, nature, and people they are unlikely ever to see in person. Through zoos, we have learned to look at faraway places, environments, and peoples through the lens of endangered animals. Animal and human lives dramatically collided in the twentieth century and \"Animal Empire\" is a global history as it appeared at the zoo through the life and death of the animals, the keepers who mucked out their cages and reared their young, the traders who captured animals and the imagination of the American public, and the zoo officials who have helped make the idea of animal endangerment a key indictment of our contemporary civilization.-- Provided by publisher
Book
Has the Earth’s sixth mass extinction already arrived?
Mass extinctions: are we there yet?
Palaeontologists recognize five major extinction events from the fossil record, with the most recent, the Cretaceous mass extinction, ending some 65 million years ago. Given the many species known to have disappeared in the past few thousand years, some biologists suggest that a sixth such event is now under way. Barnosky
et al
. set out to review the evidence for that claim, and conclude that the recent loss of species is dramatic and serious, but not yet in the mass extinction category — usually defined as a loss of at least 75% of Earth's species in a geologically short time frame. But that said, there are clear indications that the loss of species now classed as 'critically endangered' would soon propel the world into its sixth mass extinction.
Palaeontologists characterize mass extinctions as times when the Earth loses more than three-quarters of its species in a geologically short interval, as has happened only five times in the past 540 million years or so. Biologists now suggest that a sixth mass extinction may be under way, given the known species losses over the past few centuries and millennia. Here we review how differences between fossil and modern data and the addition of recently available palaeontological information influence our understanding of the current extinction crisis. Our results confirm that current extinction rates are higher than would be expected from the fossil record, highlighting the need for effective conservation measures.
Journal Article
Genomic insights into the conservation status of the world’s last remaining Sumatran rhinoceros populations
Small populations are often exposed to high inbreeding and mutational load that can increase the risk of extinction. The Sumatran rhinoceros was widespread in Southeast Asia, but is now restricted to small and isolated populations on Sumatra and Borneo, and most likely extinct on the Malay Peninsula. Here, we analyse 5 historical and 16 modern genomes from these populations to investigate the genomic consequences of the recent decline, such as increased inbreeding and mutational load. We find that the Malay Peninsula population experienced increased inbreeding shortly before extirpation, which possibly was accompanied by purging. The populations on Sumatra and Borneo instead show low inbreeding, but high mutational load. The currently small population sizes may thus in the near future lead to inbreeding depression. Moreover, we find little evidence for differences in local adaptation among populations, suggesting that future inbreeding depression could potentially be mitigated by assisted gene flow among populations.
Highly endangered species like the Sumatran rhinoceros are at risk from inbreeding. Five historical and 16 modern genomes from across the species range show mutational load, but little evidence for local adaptation, suggesting that future inbreeding depression could be mitigated by assisted gene flow among populations.
Journal Article
Lost before found: A new species of whaler shark Carcharhinus obsolerus from the Western Central Pacific known only from historic records
Carcharhinus obsolerus is described based on three specimens from Borneo, Thailand and Vietnam in the Western Central Pacific. It belongs to the porosus subgroup which is characterised by having the second dorsal-fin insertion opposite the anal-fin midbase. It most closely resembles C. borneensis but differs in tooth morphology and counts and a number of morphological characters, including lack of enlarged hyomandibular pores which are diagnostic of C. borneensis. The historic range of C. obsolerus sp. nov. is under intense fishing pressure and this species has not been recorded anywhere in over 80 years. There is an urgent need to assess its extinction risk status for the IUCN Red List of Threatened Species. With so few known records, there is a possibility that Carcharhinus obsolerus sp. nov. has been lost from the marine environment before any understanding could be gained of its full historic distribution, biology, ecosystem role, and importance in local fisheries.
Journal Article
Genetic and demographic history define a conservation strategy for earth’s most endangered pinniped, the Mediterranean monk seal Monachus monachus
The Mediterranean monk seal (Monachus monachus) is a flagship species for marine conservation, but important aspects of its life history remain unknown. Concerns over imminent extinction motivated a nuclear DNA study of the species in its largest continuous subpopulation in the eastern Mediterranean Sea. Despite recent evidence of partial subpopulation recovery, we demonstrate that there is no reason for complacency, as the species still shares several traits that are characteristic of a critically endangered species: Mediterranean monk seals in the eastern Mediterranean survive in three isolated and genetically depauperate population clusters, with small effective population sizes and high levels of inbreeding. Our results indicated male philopatry over short distances, which is unexpected for a polygynous mammal. Such a pattern may be explained by the species’ unique breeding behavior, in which males defend aquatic territories near breeding sites, while females are often forced to search for new pupping areas. Immediate action is necessary to reverse the downward spiral of population decline, inbreeding accumulation and loss of genetic diversity. We propose concrete conservation measures for the Mediterranean monk seal focusing on reducing anthropogenic threats, increasing the population size and genetic diversity, and thus improving the long-term prospects of survival.
Journal Article
Temporal increase in organic mercury in an endangered pelagic seabird assessed by century-old museum specimens
Methylmercury cycling in the Pacific Ocean has garnered significant attention in recent years, especially with regard to rising mercury emissions from Asia. Uncertainty exists concerning whether increases in anthropogenic emissions over time may have caused increased mercury bioaccumulation in the biota. To address this, we measured total mercury and, for a subset of samples, methylmercury (the bioaccumulated form of mercury) in museum feathers from an endangered seabird, the black-footed albatross (Phoebastria nigripes), spanning a 120-y period. We analyzed stable isotopes of nitrogen (δ¹âµN) and carbon (δ¹³C) to control for temporal changes in trophic structure and diet. In post-1940 and -1990 feathers, we detected significantly higher mean methylmercury concentrations and higher proportions of samples exhibiting above deleterious threshold levels (
Journal Article
