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Caribbean Basin Hoffman Et Al.Pdf Special Publications Museum of Texas Tech University Number xx71 11xx October XXXX 20102019 Title From Field to Laboratory: A Memorial Volume In Honor of Robert J. Baker Edited by Robert D. Bradley, Hugh H. Genoways, David J. Schmidly, and Lisa C. Bradley Front cover: A selection of photos representing Robert J. Baker’s career. The editors of this volume sincerely thank the many colleagues, friends, and students of Robert J. Baker that contributed 300+ photographs for the Baker retirement celebration in 2015 and for the memorial service in 2018, from which the images featured on this cover were selected. Top row, left to right: Baker in his Biology lab, 2006, photo by Neal Hinkle, courtesy of Texas Tech University; preparing to karyotype a Sundamys muelleri, Sabah, Malaysian Borneo, 2006, photo by Peter A. Larsen; pinning bat specimens, Rattlesnake Canyon, Val Verde County, Texas, 2005, photo by Bill D. Mueller, courtesy of Museum of Texas Tech University. Middle row, left to right: examining a Macrotus californicus, 2011, Picacho Peak State Park, Arizona, photo by Lizette Siles; setting a mist net, 2009, Placitas, New Mexico, photo by Lizette Siles; removing a Uroderma bilobatum from a mist net, 1977, Guatemala, photo by Ira F. Greenbaum. Bottom row, left to right: admiring a Hipposideros galeritus, Sarawak, Malaysian Borneo, 2006, photo by Peter A. Larsen; karyotyping, Guatemala, 1977, photo by Ira F. Greenbaum; with Chernobyl specimens at NSRL, 1990, photo by Artie Limmer, courtesy of Texas Tech University. SPECIAL PUBLICATIONS Museum of Texas Tech University Number 71 From Field to Laboratory: A Memorial Volume in Honor of Robert J. Baker EDITED BY ROBERT D. BRADLEY, HUGH H. GENOWAYS, DAVID J. SCHMIDLY, AND LISA C. BRADLEY Layout and Design: Lisa Bradley Cover Design: Lisa Bradley; photos courtesy of various individuals (see inside front cover) Production Editor: Lisa Bradley Copyright 2019, Museum of Texas Tech University This publication is available free of charge in PDF format from the website of the Natural Sciences Research Laboratory, Museum of Texas Tech University (nsrl.ttu.edu). The authors and the Museum of Texas Tech University hereby grant permission to interested parties to download or print this publication for personal or educational (not for profit) use. Re-publication of any part of this paper in other works is not permitted without prior written permission of the Museum of Texas Tech University. This book was set in Times New Roman and printed on acid-free paper that meets the guidelines for per- manence and durability of the Committee on Production Guidelines for Book Longevity of the Council on Library Resources. Printed: 11 October 2019 Library of Congress Cataloging-in-Publication Data Special Publications of the Museum of Texas Tech University, Number 71 Series Editor: Robert D. Bradley From Field to Laboratory: A Memorial Volume in Honor of Robert J. Baker Robert D. Bradley, Hugh H. Genoways, David J. Schmidly, and Lisa C. Bradley (editors) ISSN 0149-1768 ISBN 1-929330-37-5 ISBN13 978-1-929330-37-9 Museum of Texas Tech University Lubbock, TX 79409-3191 USA (806)742-2442 PREDICTORS OF BAT SPECIES RICHNESS WITHIN THE ISLANDS OF THE CARIBBEAN BASIN JUSTIN D. HOFFMAN, GABRIELLE D. KADLUBAR, SCOTT C. PEDERSEN, ROXANNE J. LARSEN, PETER A. LARSEN, CARLETON J. PHILLIPS, GARY G. KWIECINSKI, AND HUGH H. GENOWAYS ABSTRACT Several mechanisms have been shown to influence species richness among island ecosystems, yet most studies limit their focus to a few predictor variables. The objec- tive of this study is to investigate variation in Chiropteran richness across islands in the Caribbean Basin with an extensive set of predictor variables. Using recent faunal surveys, the most contemporary list of bat species per island was complied. Data were collected on 17 predictor variables, which summarized five general island characteris- tics including island area, isolation, habitat diversity, human impact, and climate. An information-theoretic approach was used by fitting alternative candidate models to de- termine which variable(s) best predicted bat species richness. Island area and timing of human colonization were most important when islands located on the continental shelf were included in the analysis. When these islands were removed, measures of habitat diversity and climate became the most important predictors for all island groups except the Bahamas, where no variables predicted species richness better than chance. The results of this analysis highlight the importance of island area, habitat heterogeneity, and climate in determining the bat species richness on Caribbean islands. Key words: area, Caribbean Basin, Chiroptera, climate, habitat diversity, island biogeography, isolation, Mammalia, species richness INTRODUCTION Island ecosystems have provided valuable insight “area per se” and “habitat heterogeneity” (MacArthur to the studies of ecology, biogeography, and evolution. and Wilson 1963, 1967). The area per se hypothesis Due to their variation in size, location, geologic history, proposes that species richness is the result of the dy- and environmental conditions, islands provide ideal set- namic relationship between extinction and immigration. tings for natural experiments and were the major focus Specifically, it states that population sizes increase of seminal publications by Darwin (1859) and Wallace on large islands, which will subsequently decrease (1860, 1880). One of the most influential works on extinction rates. Additionally, larger islands should island dynamics in the 20th century is MacArthur and have higher immigration rates. Combined, these two Wilson’s equilibrium theory of island biogeography dynamic processes should lead to higher species rich- (MacArthur and Wilson 1963, 1967). This theory ness. The habitat heterogeneity hypothesis predicts that postulates that species richness on an island is the de- more complex habitats possess more niches that can be terminant of two dynamic processes—extinction and exploited by a higher variety of species. It is assumed immigration. The authors hypothesized that rates of that as island area increases, new habitats are added, extinction would be lower on larger islands compared thus resulting in more species. There has been much to small ones and that immigration rates would be debate over which hypothesis better predicts species higher to islands located closer to the mainland. Two richness, with some recent studies suggesting that the prominent hypotheses that often have been proposed for two hypotheses are not mutually exclusive but rather explaining patterns of species richness on islands are complimentary (Kallimanis et al. 2008). 337 338 SPECIAL PUBLICATIONS, MUSEUM OF TEXAS TECH UNIVERSITY Quantifying habitat diversity, especially over events (Cooke et al. 2017) and contemporary anthro- larger spatial scales, can be problematic (Ricklefs and pogenic activities (Chown et al. 1998). Both situations Lovette 1999). In lieu of reliable habitat data, a fre- commonly result in a loss of species diversity. Cur- quently used surrogate for habitat diversity is maximum rent human activities that threaten island biodiversity elevation (Pedersen et al. 2018b). Higher elevations include hunting, land conversion, and the introduction are often equated to more topographic diversity and are of exotic species (Wiles and Brooke 2010; Valente et al. often strongly correlated with diversity in plant species 2017; Turvey et al. 2017). Capture of animals for local (Tews et al. 2004). More advanced measures of habitat consumption and trade often is uncontrolled on islands heterogeneity such as surface ruggedness (Grohmann and can result in local extinctions (Riley 2002). The et al. 2011) and the 3D volume of a habitat (Flaspohler introductions of exotic species to islands have caused et al. 2010; Davies and Asner 2014) have proved suc- the loss of native island biota through direct predation, cessful in predicting suitable habitat, but have yet to competition for resources, or spread of exotic diseases be used in studies of island biogeography. (Altizer et al. 2001; Wikelski et al. 2004). Although many native species have been impacted negatively Another aspect of island area that can effect spe- by habitat loss and exotic introductions, some have cies richness is the amount of area lost since the Last benefited from these activities. It is likely that native Glacial Maximum (LGM). The deglaciation events frugivores in the Caribbean, including bats (i.e., Ar- that occurred ~22,000 to ~13,000 years before present tibeus spp. and Brachyphyla cavernarum), benefited caused significant changes in climate and landscape from the expansion of many fruit trees, such as mango, features of the Northern Hemisphere including dramatic papaya, and banana, throughout the Caribbean Islands rises (~125 m) in sea level (Hag et al. 1993; Hearty (García-Morales et al. 2013; Ávila-Gómez et al. 2015; 1998; Yokoyama et al. 2000; Curtis et al. 2001; Clark Jung and Threlfell 2016). et al. 2002, 2009; Gehrels 2010). This resulted in sig- nificant land loss and has been linked to the extinction Current climate conditions have a profound effect of certain species and subsequent loss of diversity on on species distributions and influence regional species islands (MacFarlane et al. 1998; Morgan 2001; Dávalos diversity (Andrewartha and Birch 1954), however and Russell 2012; Rijsdijk et al. 2014). However, there these variables (i.e., temperature and precipitation) are has been some debate
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