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Hemiptera, Cicadidae) Allen F View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by DigitalCommons@Florida International University Florida International University FIU Digital Commons Department of Biological Sciences College of Arts, Sciences & Education 12-29-2011 Thermal Adaptation and Diversity in Tropical Ecosystems: Evidence from Cicadas (Hemiptera, Cicadidae) Allen F. Sanborn Barry University James E. Heath Buchanan Dam Polly K. Phillips Miramar, Florida Maxine S. Heath Buchanan Dam Fernando G. Noriega Department of Biological Sciences, Florida International University, [email protected] Follow this and additional works at: http://digitalcommons.fiu.edu/cas_bio Part of the Biology Commons Recommended Citation Sanborn AF, Heath JE, Phillips PK, Heath MS, Noriega FG (2011) Thermal Adaptation and Diversity in Tropical Ecosystems: Evidence from Cicadas (Hemiptera, Cicadidae). PLoS ONE 6(12): e29368. doi:10.1371/journal.pone.0029368 This work is brought to you for free and open access by the College of Arts, Sciences & Education at FIU Digital Commons. It has been accepted for inclusion in Department of Biological Sciences by an authorized administrator of FIU Digital Commons. For more information, please contact [email protected]. Thermal Adaptation and Diversity in Tropical Ecosystems: Evidence from Cicadas (Hemiptera, Cicadidae) Allen F. Sanborn1*, James E. Heath2, Polly K. Phillips3, Maxine S. Heath2, Fernando G. Noriega4 1 Department of Biology, Barry University, Miami Shores, Florida, United States of America, 2 Buchanan Dam, Texas, United States of America, 3 Miramar, Florida, United States of America, 4 Department of Biological Sciences, Florida International University, Miami, Florida, United States of America Abstract The latitudinal gradient in species diversity is a central problem in ecology. Expeditions covering approximately 16u549 of longitude and 21u49 of latitude and eight Argentine phytogeographic regions provided thermal adaptation data for 64 species of cicadas. We test whether species diversity relates to the diversity of thermal environments within a habitat. There are general patterns of the thermal response values decreasing in cooler floristic provinces and decreasing maximum potential temperature within a habitat except in tropical forest ecosystems. Vertical stratification of the plant communities leads to stratification in species using specific layers of the habitat. There is a decrease in thermal tolerances in species from the understory communities in comparison to middle level or canopy fauna. The understory Herrera umbraphila Sanborn & Heath is the first diurnally active cicada identified as a thermoconforming species. The body temperature for activity in H. umbraphila is less than and significantly different from active body temperatures of all other studied species regardless of habitat affiliation. These data suggest that variability in thermal niches within the heterogeneous plant community of the tropical forest environments permits species diversification as species adapt their physiology to function more efficiently at temperatures different from their potential competitors. Citation: Sanborn AF, Heath JE, Phillips PK, Heath MS, Noriega FG (2011) Thermal Adaptation and Diversity in Tropical Ecosystems: Evidence from Cicadas (Hemiptera, Cicadidae). PLoS ONE 6(12): e29368. doi:10.1371/journal.pone.0029368 Editor: Pedro Lagerblad Oliveira, Universidade Federal do Rio de Janeiro, Brazil Received August 30, 2011; Accepted November 27, 2011; Published December 29, 2011 Copyright: ß 2011 Sanborn et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Funding: Financial support for this work was provided by the Fulbright Foundation (JEH), Tinker Foundation (MSH, AFS), United States Public Health Service traineeship GMS07143 (AFS), Sigma Xi (AFS), Special Program for the Improvement and Development of the Ecological Research (FGN), University of Illinois Graduate College (AFS), and Barry University (AFS). The funders had no role in study, design, data collection and analysis, decision to publish, or preparation of the manuscript. Competing Interests: The authors have declared that no competing interests exist. * E-mail: [email protected] Introduction Although living systems can interact to alter the species gradient at a local level, abiotic factors may also be important in generating The latitudinal gradient in species richness where diversity the latitudinal species gradient. There are several hypotheses increases from polar latitudes towards the tropical ecosystems was relating abiotic factors to the observed latitudinal species gradient. first described by Forster [1] and von Humboldt [2]. It is the oldest Included in these abiotic influences are the time hypothesis [7], recognized ecological relationship [3,4] occurring in both plants which states where organisms in tropical ecosystems have had and animals and in terrestrial and aquatic environments. more time to diversify than in temperate ecosystems; the area However, the relationship is one of the central problems of hypothesis [8–10] suggesting that tropical ecosystems are larger ecology and biogeography and still remains fundamentally and can support greater population densities resulting in fewer unexplained even though it is demonstrated in the fossil record extinctions; the productivity hypothesis [11,12] which proposes it for as long as 250 million years [3]. is the greater energy available in tropical ecosystems that leads to There have been multiple hypotheses proposed for the the diversity; and the evolutionary speed hypothesis [13] which generation of the observed diversity gradient. The hypotheses suggests species diversity is greater in warmer environments and include interactions of living systems (biotic hypotheses) or environments which have remained stable for extended geologic interactions with the environment (abiotic hypotheses). However, time. many of these hypotheses are contradictory. For example, one Another hypothesis for tropical species diversity is the ambient hypothesis suggests that lower competition in temperate ecosys- energy hypothesis [3,14,15] that suggests species diversity is tems produces more r-selected species while the production of K- influenced by the climate to which species are exposed, selected species in tropical ecosystems is a result of greater particularly temperature. In this case the greater species diversity competition and niche separation [5]. This is in conflict with a is proposed to be a result of animals being able to spend more hypothesis suggesting the greater predation rates and parasites energy on reproduction in warmer climates. Janzen [16] proposed found in tropical ecosystems lead to a reduction in competition for that adaptation to minor differences in physical characteristics of resources and the ability of a greater number of species to coexist the tropical environment (including temperature) could lead to [6]. more complex communities and greater species diversity. Currie PLoS ONE | www.plosone.org 1 December 2011 | Volume 6 | Issue 12 | e29368 Thermal Adaptation and Tropical Diversity [17] also suggested thermoregulatory requirements influence hypodermic microprobe copper/constantan thermocouple accu- species diversity in various habitats. rate to 60.1uC and a time constant of 0.15 s21 or a Telethermo- Measurements of ambient temperature in rainforest habitats meter thermometer and a 26 gauge hypodermic thermistor probe. show there is a vertical stratification in temperature [18–22]. The The thermocouple probes were calibrated with a National thermal environment is also more stable near the ground with Institute of Standards and Technology thermometer to insure greater temperature fluctuations occurring in the canopy [18–22]. measurement accuracy. The probe was inserted midway into the These data suggest there are multiple thermal environments dorsal mesothorax to measure deep Tb. Specimens were handled within the complex vegetation of tropical habitats that animals only by the wings prior to insertion of the thermocouple to prevent may exploit if they can adapt their physiology to specific thermal conductive heat transfer with the insect. It should be reiterated environments. that the thermal responses determined for individual species have Measurement and analysis of thermal adaptation in cicadas been shown to be the same over time spans as great at 34 years began with the study of the thermal responses of the periodical and distances of 1000 km between sampled populations [30] and cicada Magicicada cassinii (Fisher) by Heath [23]. Since that time, that habitat rather than phylogeny influences the evolution of numerous studies have investigated thermal adaptation to various thermal tolerances [32] so no potential bias due to sampling time environments from five continents (see summary in [24], [25–34]). or location or phylogeny of a species was introduced to the data. These studies have shown similar evolutionary tendencies in Specimens were cooled to a torpid state to begin the thermal thermal preferences in species from similar environments that are experiments. Animals were then tossed 1–2 m into the air while otherwise geographically isolated illustrating that adaptation to they warmed passively to the point where they could make a ambient conditions is important
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