Modeling the Effects of Precipitation on Salamander Demography for Conservation Planning

Modeling the Effects of Precipitation on Salamander Demography for Conservation Planning
Author: Jillian Sloper Howard
Publisher:
Total Pages: 354
Release: 2018
Genre:
ISBN:

Integrative conservation recognizes that conservation of natural resources is a complex process because most, if not all, systems are coupled human and natural systems. Conservation planning requires conceptual tools that transcend disciplines and understanding of the ecological and human aspects of a system. For example, Southern Appalachia is a region of exceptional biodiversity which provides a number of ecosystem services within and across the broader southeastern United States. It is also a rapidly exurbanizing landscape with associated cultural and social pressures and is expected to experience significant climate change in the future. A key issue in this region is increasing residential development on steep mountain slopes and how it will impact social and economic development, public safety, and the integrity of terrestrial and aquatic ecosystems. In order for communities to conserve and manage their natural systems, we need rigorous models to identify and prioritize areas of high current and future suitability for sensitive taxa. However, for many of those species, we lack the rigorous demographic data needed for such models. At the same time, we must have an understanding of local stakeholder perspectives and values regarding issues like steep slope development that may affect conservation priorities. In this dissertation, I address these needs in the context of salamander ecology and conservation. First, I conducted a literature review to assess current knowledge of demographic rates available for parameterizing models of population dynamics for direct-developing North American salamanders in the family Plethodontidae. I determined that some rates, such as clutch size and frequency are well-documented and reasonably transferrable across species, but there are very few published estimates of survival, and nearly half of those published rates may not be realistic despite being estimated from field data. I found that there were few expected patterns in estimated survival rates among methodologies or environments that could be used to predict variation in survival among taxa and contexts from published studies. Next, I developed a Bayesian model for an eight-year robust design, capture-mark-recapture dataset of Plethodon in the Coweeta Basin in western North Carolina to estimate salamander survival rates and their sensitivity to precipitation. I used several hundred observations of live and preserved mature female salamanders to develop a novel algorithm to estimate final clutch size from ovarian follicle counts made at different points in the female reproductive cycle. I also used N-mixture models of repeated counts of salamanders across a spatial precipitation gradient to estimate size-class specific abundance and reproductive rates as a function of mean annual precipitation. I used the survival and reproductive rate estimates to project salamander population growth across the extent of the Coweeta Basin and Macon County, North Carolina, under current [past 30 years] climate and future drought frequency and severity scenarios. Model projections suggest that only a small proportion of the region likely supports consistent positive salamander population growth. Many areas occupied by salamanders likely have limited abundance and depend on limited source habitats such as coves to support local salamander populations. Finally, I used archival research, targeted interviews and participatory mapping to identify the primary concerns of stakeholders in Macon County regarding the regional environment and forest land use. I found that people are generally concerned about steep slope development, but their primary focus is on the economic impacts and regulation of development, not on its ecological impacts. These local priorities differ from the foci of scientists working in the region who are primarily concerned with impacts of steep slope development on biodiversity and natural resources. Nonetheless, while artifacts suggest a non-ecological focus on steep slope development, participants in the mapping study consistently placed conservation land use priorities at higher elevations than development priorities, suggesting some intrinsic connection between steep slopes and conservation. A combined, spatially-explicit map of stakeholder land use priorities and projected salamander population growth rates identified consistencies between areas people prioritized for conservation and areas likely to sustain salamander populations under current and future precipitation scenarios.

Forests of Iran

Forests of Iran
Author: Khosro Sagheb Talebi
Publisher: Springer Science & Business Media
Total Pages: 157
Release: 2013-10-22
Genre: Technology & Engineering
ISBN: 9400773714

The work describes the general ecological aspects of Iran as well as West and Central Asia in the introduction. The book includes three chapters, each describing the climate, geology and soil characteristics, vegetation and forest types, site demands of the main tree species and the ecogram of them, management and socio-economic issues of three different phytogeographical regions, mainly the Hyrcanian, Irano-Turanian, and Saharo-Sindian. Each chapter contains a table for introducing the English and Botanical names of the plant species mentioned in the chapter. The information presented in this book is based on personal experiences and results of research projects of the authors, as well as experiences of other forest scientists in Iran. The references are given at the end of each chapter separately. The book contains 10 tables, 37 black and white and 55 color pictures.

Hybrid Solutions for the Modelling of Complex Environmental Systems

Hybrid Solutions for the Modelling of Complex Environmental Systems
Author: Christian E. Vincenot
Publisher: Frontiers Media SA
Total Pages: 186
Release: 2017-01-11
Genre:
ISBN: 2889450554

Systems studied in environmental science, due to their structure and the heterogeneity of the entities composing them, often exhibit complex dynamics that can only be captured by hybrid modeling approaches. While several concurrent definitions of “hybrid modeling” can be found in the literature, it is defined here broadly as the approach consisting in coupling existing modelling paradigms to achieve a more accurate or efficient representation of systems. The need for hybrid models generally arises from the necessity to overcome the limitation of a single modeling technique in terms of structural flexibility, capabilities, or computational efficiency. This book brings together experts in the field of hybrid modelling to demonstrate how this approach can address the challenge of representing the complexity of natural systems. Chapters cover applied examples as well as modeling methodology.

Models for Planning Wildlife Conservation in Large Landscapes

Models for Planning Wildlife Conservation in Large Landscapes
Author: Joshua Millspaugh
Publisher: Academic Press
Total Pages: 736
Release: 2011-04-28
Genre: Science
ISBN: 0080920160

A single-resource volume of information on the most current and effective techniques of wildlife modeling, Models for Planning Wildlife Conservation in Large Landscapes is appropriate for students and researchers alike. The unique blend of conceptual, methodological, and application chapters discusses research, applications and concepts of modeling and presents new ideas and strategies for wildlife habitat models used in conservation planning. The book makes important contributions to wildlife conservation of animals in several ways: (1) it highlights historical and contemporary advancements in the development of wildlife habitat models and their implementation in conservation planning; (2) it provides practical advice for the ecologist conducting such studies; and (3) it supplies directions for future research including new strategies for successful studies.Intended to provide a recipe for successful development of wildlife habitat models and their implementation in conservation planning, the book could be used in studying wildlife habitat models, conservation planning, and management techniques. Additionally it may be a supplemental text in courses dealing with quantitative assessment of wildlife populations. Additionally, the length of the book would be ideal for graduate student seminar course.Using wildlife habitat models in conservation planning is of considerable interest to wildlife biologists. With ever tightening budgets for wildlife research and planning activities, there is a growing need to use computer methods. Use of simulation models represents the single best alternative. However, it is imperative that these techniques be described in a single source. Moreover, biologists should be made aware of alternative modeling techniques. It is also important that practical guidance be provided to biologists along with a demonstration of utility of these procedures. Currently there is little guidance in the wildlife or natural resource planning literature on how best to incorporate wildlife planning activities, particularly community-based approaches. Now is the perfect time for a synthestic publication that clearly outlines the concepts and available methods, and illustrates them. - Only single resource book of information not only on various wildlife modeling techniques, but also with practical guidance on the demonstrated utility of each based on real-world conditions. - Provides concepts, methods and applications for wildlife ecologists and others within a GIS context. - Written by a team of subject-area experts

Interpretation and Implications of Variability in Ecological Systems

Interpretation and Implications of Variability in Ecological Systems
Author: Robert Klinger
Publisher: Frontiers Media SA
Total Pages: 206
Release: 2024-07-22
Genre: Science
ISBN: 2832551734

Numerous hypotheses have been proposed to explain the dynamics in abundance of individual species, how species interact, how communities assemble, and how interactions between biotic and abiotic processes shape ecosystem stability. Many if not most of these hypotheses find some degree of support, but often only within relatively narrow spatial and temporal ranges. This is because conditions vary over time and from place to place, and so the strength and extent of processes that were the focus of a given a hypothesis become altered by other forces. Ecologists have confronted variability from two perspectives; conceptual and statistical. Conceptually, spatial and temporal variability are now recognized as being scale dependent and hierarchical. Statistically, there are many models that ecologists readily use that account for the hierarchical and scale-dependence of variability present in many datasets. But linking the two perspectives into a meaningful understanding of what variability means in real systems has been much less successful. For example, it is common to see studies where the fixed effects of a generalized linear mixed model are reported, but very often random effects are completely ignored or, at best, given scant attention. The likelihood of this being a significant problem increases greatly in what are rapidly becoming more common studies that utilize datasets spanning long temporal and/or large spatial scales, or when extreme and often unpredictable events (gray and black swans) occur.

Amphibian Conservation

Amphibian Conservation
Author: Rebecca K. Smith
Publisher: Pelagic Publishing Ltd
Total Pages: 273
Release: 2014-05-16
Genre: Nature
ISBN: 178427027X

Amphibian Conservation is the fourth in the series of Synopses of Conservation Evidence, linked to the online resource www.ConservationEvidence.com. This synopsis is part of the Conservation Evidence project and provides a useful resource for conservationists. It forms part of a series designed to promote a more evidence-based approach to biodiversity conservation. Others in the series include bee, bird, farmland and bat conservation and many others are in preparation. Approximately 32% of the 7,164+ amphibian species are currently threatened with extinction and at least 43% of species are declining. Despite this, until recently amphibians and their conservation had received little attention. Although work is now being carried out to conserve many species, often it is not adequately documented. This book brings together and summarises the available scientific evidence and experience relevant to the practical conservation of amphibians. The authors consulted an international group of amphibian experts and conservationists to produce a thorough summary of what is known, or not known, about the effectiveness of amphibian conservation actions across the world. "The book is packed with literature summaries and citations; a veritable information goldmine for graduate students and researchers. It also admirably provides decision makers with a well-researched resource of proven interventions that can be employed to stem/reverse the decline of amphibian populations." -John G Palis, Bulletin of the Chicago Herpetological Society

Effects of Agricultural Conservation Practices on Fish and Wildlife

Effects of Agricultural Conservation Practices on Fish and Wildlife
Author:
Publisher:
Total Pages: 404
Release: 2008
Genre: Agricultural conservation
ISBN:

"The bibliography is a guide to recent scientific literature covering effects of agricultural conservation practices on fish and wildlife. The citations listed here provide information on how conservation programs and practices designed to improve fish and wildlife habitat, as well as those intended for other purposes (e.g., water quality improvement), affect various aquatic and terrestrial fauna"--Abstract.