DOCSLIB.ORG

Chemical Encoding of Risk Perception and Predator Detection Among Estuarine Invertebrates

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Chemical Encoding of Risk Perception and Predator Detection Among Estuarine Invertebrates Chemical encoding of risk perception and predator detection among estuarine invertebrates Remington X. Poulina,b, Serge Lavoieb,c, Katherine Siegeld, David A. Gaula, Marc J. Weissburgb,c, and Julia Kubaneka,b,c,e,1 aSchool of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332; bAquatic Chemical Ecology Center, Georgia Institute of Technology, Atlanta, GA 30332; cSchool of Biological Sciences, Georgia Institute of Technology, Atlanta, GA 30332; dSchool of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332; and eInstitute for Bioengineering and Biosciences, Georgia Institute of Technology, Atlanta, GA 30332 Edited by Jerrold Meinwald, Cornell University, Ithaca, NY, and approved November 29, 2017 (received for review August 8, 2017) An effective strategy for prey to survive in habitats rich in predators aquatic systems, the receptors that mediate chemoreception and is to avoid being noticed. Thus, prey are under selection pressure to recognition of these cues, and the specificity to these cues, necessi- recognize predators and adjust their behavior, which can impact tating further research. numerous community-wide interactions. Many animals in murky One explanation for the lack of characterized waterborne cues is and turbulent aquatic environments rely on waterborne chemical that purification methodologies for highly water-soluble compounds cues. Previous research showed that the mud crab, Panopeus herb- have been unsatisfactory, especially when working with seawater stii, recognizes the predatory blue crab, Callinectus sapidus,viaacue samples that contain substantial quantities of inorganic salts. Stan- in blue crab urine. This cue is strongest if blue crabs recently preyed dard sampling methods for airborne chemical cues such as head- upon mud crabs. Subsequently, mud crabs suppress their foraging space analysis for volatile insect pheromones (20) are unavailable activity, reducing predation by blue crabs. Using NMR spectroscopy- for nonvolatile waterborne cues. Many waterborne cues are present and mass spectrometry-based metabolomics, chemical variation in in very low concentrations, unstable to handling in the laboratory, urine from blue crabs fed different diets was related to prey behav- and produced by organisms that either are not abundant or not ior. We identified the urinary metabolites trigonelline and homarine readily cultivated in the laboratory. It may be difficult to identify in as components of the cue that mud crabs use to detect blue crabs, which tissues of an organism these cues are produced or stored, and with concentrations of each metabolite dependent on the blue when this is possible the signaling molecules may occur as part of a crab’s diet. At concentrations found naturally in blue crab urine, complex mixture with many other, irrelevant metabolites. trigonelline and homarine, alone as well as in a mixture, alerted Traditionally, chemists have applied a process of bioassay- mud crabs to the presence of blue crabs, leading to decreased guided fractionation to purify and then characterize biologically foraging by mud crabs. Risk perception by waterborne cues has active compounds. However, this multistep approach often leads been widely observed by ecologists, but the molecular nature of to decomposition of labile cues and exclusion of multicomponent these cues has not been previously identified. Metabolomics pro- cues, while simultaneously requiring substantial quantities of the vides an opportunity to study waterborne cues where other ap- chemical cue mixture for biological testing after each chemical proaches have historically failed, advancing our understanding of separation step (21). Recent advances in NMR spectroscopy the chemical nature of a wide range of ecological interactions. and MS metabolomics allow for fast, efficient, and cost-effective blue crab | chemical ecology | metabolomics | nonconsumptive effects | Significance predation Chemical cues are essential to marine life, particularly for athering and interpreting information from the environment ’ detecting predators. Despite decades of research, almost Gis imperative to organisms ability to recognize food, mates, nothing is known of the molecular nature of these waterborne predators, and appropriate habitat. Many aquatic species rely cues. This prevents us from assessing environmental variation on chemical cues in environments where auditory, visual, and and impacts of these cues and from understanding and ma- mechanosensory mechanisms are often compromised (1–3). nipulating predator–prey signaling pathways. Leveraging nat- Significant efforts have been made to understand chemical de- ural chemical variation in the urine of a predatory crab using fenses and feeding deterrents (4–7) as many have potential metabolomics, the chemical profiles of urine from crabs fed medicinal applications (8–10); however, waterborne cues remain different diets were revealed to be predictive of their fear- almost completely unidentified. inducing potency. This pattern led us to identify the major The ability to sense and recognize predators remotely is partic- constituents of the chemical cue used by mud crab prey to ularly important for organisms because it allows for the production detect and avoid their predator. This investigation serves as a of behavioral, morphological, or life historical adjustments to min- blueprint for investigating the molecular nature of these imize predation (11). Although significant evidence exists for community-structuring waterborne cues. widespread chemical detection of predators and alarm cues among conspecifics in the marine environment (12–14), little is Author contributions: R.X.P., S.L., M.J.W., and J.K. designed research; R.X.P., S.L., K.S., and D.A.G. performed research; R.X.P., S.L., D.A.G., and J.K. analyzed data; and R.X.P., S.L., known about the molecular nature of the cues involved. These M.J.W., and J.K. wrote the paper. cues are of particular importance as they routinely produce eco- The authors declare no conflict of interest. logically significant nonconsumptive effects, that is, altered species This article is a PNAS Direct Submission. interactions beyond the effects of lost prey by cause of consumption due to changes in the morphology, behavior, or life history of prey Published under the PNAS license. Data deposition: Metabolomic data for this project are publicly available on the Biological (15). Nonconsumptive effects havebeendemonstratedinaquatic and Chemical Oceanography Data Management Office database (https://www.bco-dmo.org/ (16–18) and terrestrial environments (19)andaresuggestedtohave project/565703). even greater capacity to structure communities than the direct effects 1To whom correspondence should be addressed. Email: [email protected]. of consuming prey (15). Due to the lack of a molecular understanding This article contains supporting information online at www.pnas.org/lookup/suppl/doi:10. of these cue systems, little is known about how cues disperse in 1073/pnas.1713901115/-/DCSupplemental. 662–667 | PNAS | January 23, 2018 | vol. 115 | no. 4 www.pnas.org/cgi/doi/10.1073/pnas.1713901115 Downloaded by guest on October 2, 2021 profiling of complex mixtures containing waterborne cues, Table 1. Metabolites identified from blue crab urine by whose chemical variation can be leveraged to correlate the NMR spectroscopy-based PCA model (n = 9–10 urine samples for presence or abundance of particular compounds within the each diet) mixture with biological potency of the mixture. Recently, a novel Concentration in urine of blue crabs fed microalgal mate attraction pheromone was identified using MS- mud crabs based metabolomics despite pheromone concentrations in the nanomolar range (22). Metabolite Absolute, μM Relative to oyster diet Previous research showed that the mud crab, Panopeus herb- Trigonelline (1)90 1.8× stii, detects its predator, the blue crab, Callinectus sapidus, using Pyrimidine (2) 72 1.6× unknown metabolites released in the urine of blue crabs (23). Lactate (3) 250 1.3× Mud crabs reacted differently to urine from blue crabs fed mud Carnitine (4) 160 1.2× crabs vs. other prey. Using NMR- and MS-based metabolomics Choline (5) 110 1.2× we aimed to leverage the chemical variation in urine from blue Threonine (6) 160 1.1× crabs fed different diets to identify the component(s) of the cue Creatinine (7) 62 0.72× mixture that mud crabs use to recognize blue crabs. This study Trimethylamine (8) —* >1.0× provides a roadmap to identify complex waterborne cues that can Methyl glutarate (9) —* <1.0× be used to further our understanding of chemically mediated Acetate (10) —* <1.0× interactions in the marine environment. Creatine (11) —* <1.0× N-methylhistidine (12) 99 0.75× Results Alanine (13) 180 0.50× Mud Crabs Perceive Risk via Concentration Differences in Predator Urinary Metabolites. When we employed 1H NMR-based metab- *Concentration could not be determined due to NMR spectral overlap of olomics comparing the chemical profiles of urine from blue crabs diagnostic protons. fed mud crabs vs. oysters, principal component analysis (PCA) revealed a single principal component accounting for 19.5% of the identifications (SI Appendix,Fig.S6andTableS1). Thus, whereas total variation among urine samples which differentiated urine of A individual metabolites pinpointed via PCA were not purified from blue crabs fed the two diets (Fig. 1 ). An orthogonalized partial blue crab urine, their structures were confidently assigned,
Load more

Recommended publications
  • Fishing for Toxins
    000 - Applied Bio Systems Article 19/7/06 11:37 am Page 2 Fishing for Toxins ENVIRONMENTAL Professor Allan Cembella, Professor in the Faculty of Biology and Chemistry at the University of Bremen ANALYSIS and Head of Biological Sciences at the Alfred Wegener Institute. Email: [email protected] Abstract Researchers at the Alfred Wegener Institute (AWI) for Polar and Marine Research in Bremerhaven, Germany are applying advanced chemical and molecular biological technologies to answer ecological questions. They are analysing trace levels of natural bioactive substances in seawater and marine biotoxins produced by various phytoplankton (microalgae), bacteria and cyanobacteria (“blue- green algae”), trying to understand how these bioactive metabolites are produced and sequestered and what effects they have on the ecosystem. Allan Cembella, Professor in the Faculty of Biology and Chemistry at the University of Bremen and Head of Biological Sciences at AWI, describes how the division is using sophisticated chemical analytical technology, including liquid chromatography coupled with tandem mass spectrometry (LC-MS/MS), and limited genomics approaches to define the genetic regulation of marine biotoxin production and eventually determine the distribution and functional ecology of these toxins in marine food webs. Introduction The Alfred Wegener Institute in Bremerhaven, named after the famous polar explorer and geomorphologist responsible for the continental drift theory, was established in 1980 as a research institute focusing primarily on the polar regions. Since then its mandate has enlarged to embrace other disciplines in marine and coastal research in temperate waters and global climate change studies. The Division of Biological Sciences at the Institute is involved in research on projects covering organismal biology, physiology and genetics, functional ecology, molecular biology, marine and natural products chemistry and, now, ecological chemistry - chemical aspects of biological and ecological processes and mechanisms.
    [Show full text]
  • Tropical Insect Chemical Ecology - Edi A
    TROPICAL BIOLOGY AND CONSERVATION MANAGEMENT – Vol.VII - Tropical Insect Chemical Ecology - Edi A. Malo TROPICAL INSECT CHEMICAL ECOLOGY Edi A. Malo Departamento de Entomología Tropical, El Colegio de la Frontera Sur, Carretera Antiguo Aeropuerto Km. 2.5, Tapachula, Chiapas, C.P. 30700. México. Keywords: Insects, Semiochemicals, Pheromones, Kairomones, Monitoring, Mass Trapping, Mating Disrupting. Contents 1. Introduction 2. Semiochemicals 2.1. Use of Semiochemicals 3. Pheromones 3.1. Lepidoptera Pheromones 3.2. Coleoptera Pheromones 3.3. Diptera Pheromones 3.4. Pheromones of Insects of Medical Importance 4. Kairomones 4.1. Coleoptera Kairomones 4.2. Diptera Kairomones 5. Synthesis 6. Concluding Remarks Acknowledgments Glossary Bibliography Biographical Sketch Summary In this chapter we describe the current state of tropical insect chemical ecology in Latin America with the aim of stimulating the use of this important tool for future generations of technicians and professionals workers in insect pest management. Sex pheromones of tropical insectsUNESCO that have been identified to– date EOLSS are mainly used for detection and population monitoring. Another strategy termed mating disruption, has been used in the control of the tomato pinworm, Keiferia lycopersicella, and the Guatemalan potato moth, Tecia solanivora. Research into other semiochemicals such as kairomones in tropical insects SAMPLErevealed evidence of their presence CHAPTERS in coleopterans. However, additional studies are necessary in order to confirm these laboratory results. In fruit flies, the isolation of potential attractants (kairomone) from Spondias mombin for Anastrepha obliqua was reported recently. The use of semiochemicals to control insect pests is advantageous in that it is safe for humans and the environment. The extensive use of these kinds of technologies could be very important in reducing the use of pesticides with the consequent reduction in the level of contamination caused by these products around the world.
    [Show full text]
  • Disruption of Coniferophagous Bark Beetle (Coleoptera: Curculionidae: Scolytinae) Mass Attack Using Angiosperm Nonhost Volatiles: from Concept to Operational Use
    The Canadian Entomologist (2021), 153,19–35 Published on behalf of the doi:10.4039/tce.2020.63 Entomological Society of Canada ARTICLE Disruption of coniferophagous bark beetle (Coleoptera: Curculionidae: Scolytinae) mass attack using angiosperm nonhost volatiles: from concept to operational use Dezene P.W. Huber1* , Christopher J. Fettig2 , and John H. Borden3 1Faculty of Environment, University of Northern British Columbia, 3333 University Way, Prince George, British Columbia, V2N 4Z9, Canada, 2Pacific Southwest Research Station, United States Department of Agriculture Forest Service, 1731 Research Park Drive, Davis, California, 95618, United States of America, and 3JHB Consulting, 6552 Carnegie Street, Burnaby, British Columbia, V5B 1Y3, Canada *Corresponding author. Email: [email protected] (Received 24 June 2020; accepted 22 September 2020; first published online 13 November 2020) Abstract Although the use of nonhost plants intercropped among host crops has been a standard agricultural prac- tice for reducing insect herbivory for millennia, the use of nonhost signals to deter forest pests is much more recent, having been developed over the past several decades. Early exploratory studies with synthetic nonhost volatile semiochemicals led to targeted electrophysiological and trapping experiments on a variety of bark and ambrosia beetles (Coleoptera: Curculionidae: Scolytinae) across three continents. This work disclosed a suite of antennally and behaviourally active nonhost volatiles, which are detected in common across a range of coniferophagous bark beetles. It also established the fact that dispersing bark and ambro- sia beetles detect nonhost signals while in flight and avoid nonhost trees without necessarily landing on them. Later work showed that groups of synthetic nonhost volatiles, sometimes combined with insect- derived antiaggregants, are effective in protecting individual trees and forest stands.
    [Show full text]
  • "Curing" of Nicotiana Attenuata Leaves by Small Mammals Does Not Decrease Nicotine Contents
    Western North American Naturalist Volume 63 Number 1 Article 15 1-31-2003 "Curing" of Nicotiana attenuata leaves by small mammals does not decrease nicotine contents Ian T. Baldwin Max-Planck Institute for Chemical Ecology, Jena, Germany Follow this and additional works at: https://scholarsarchive.byu.edu/wnan Recommended Citation Baldwin, Ian T. (2003) ""Curing" of Nicotiana attenuata leaves by small mammals does not decrease nicotine contents," Western North American Naturalist: Vol. 63 : No. 1 , Article 15. Available at: https://scholarsarchive.byu.edu/wnan/vol63/iss1/15 This Article is brought to you for free and open access by the Western North American Naturalist Publications at BYU ScholarsArchive. It has been accepted for inclusion in Western North American Naturalist by an authorized editor of BYU ScholarsArchive. For more information, please contact [email protected], [email protected]. Western North American Naturalist 63(1), ©2003, pp. 114–117 “CURING” OF NICOTIANA ATTENUATA LEAVES BY SMALL MAMMALS DOES NOT DECREASE NICOTINE CONTENTS Ian T. Baldwin1 ABSTRACT.—Basal leaves of Nicotiana attenuata are frequently found neatly excised at the petiole and piled on rocks or soil in the sun until dry, after which they disappear, sometimes to be found again in the nests of Neotoma lepida. In response to herbivore attack, N. attenuata increases the concentration of nicotine in its leaves, where it functions as an induced defense. Since excision of leaves at the petiole allows for leaf removal without substantially activating this induced defense, and air-drying at high temperatures can volatilize nicotine, we examined the hypothesis that the observed leaf “curing” behavior decreased nicotine contents.
    [Show full text]
  • Chemical Ecology Example 1. Pyrrolizidine Alkaloids (Pas)
    Alkaloids Part 2 Chemical Ecology p. 1 Alkaloids Part 2: Chemical Ecology Example 1. Pyrrolizidine Alkaloids (PAs) - Senecionine-N-oxides Background - basic structural type, but many variations - occurrence in plants in Compositae, Boragincaceae, Orchidaceae - extremely toxic to both mammals and insects but complex interactions - documented co-evolution with specialist insects, and sophisticated use of plant defenses by insects Biosynthesis Senecionine-N-oxide synthesized from two separate pathways/moieties - necine moiety, from arginine via putrescine (decarboxylate, condense, cyclize) - dicarboxylic acid moiety, from isoleucine => both form the macrocyclic diester = senecionine - key enzyme: homospermine synthase. Evolved independently at least four time - different plant families - from deoxyhypusine synthase, and enzyme of primary metabolism (activates eukaryotic translation initiation factor eIF5A) - five distinct structural types, that vary in macrocyclic diester bridge component Pyrrolizidine alkaloid localization and transport - root synthesis of senecionine, then transported to shoot - final accumulation of alkaloids is in flowers and shoot apex - further biochemical elaboration and structural diversification (decoration of macrocycle) occurs in shoot - population differentiation (diverse mixtures of pyrrolizidine alkaloids in different plant populations) - > variable target for pests. Pyrrolizidine Alkaloid Toxicity and its Avoidance - PA-containing plants are generally avoided by herbivores ( bitter taste, toxicity) - N-oxide
    [Show full text]
  • The Lost Origin of Chemical Ecology in the Late 19Th Century
    The lost origin of chemical ecology in the late SPECIAL FEATURE 19th century Thomas Hartmann* Institut fu¨r Pharmazeutische Biologie der Technischen Universita¨t Braunschweig, Mendelssohnstrasse 1, D-38106 Braunschweig, Germany Edited by Jerrold Meinwald, Cornell University, Ithaca, NY, and approved November 11, 2007 (received for review September 28, 2007) The origin of plant chemical ecology generally dates to the late reasons for hundreds of years can be attributed to secondary 1950s, when evolutionary entomologists recognized the essential metabolites. role of plant secondary metabolites in plant–insect interactions and Entomologists in the middle of the 20th century were the first to suggested that plant chemical diversity evolved under the selec- rediscover the importance of secondary metabolites in plants’ tion pressure of herbivory. However, similar ideas had already interactions with their environment. They emphasized the crucial flourished for a short period during the second half of the 19th role of secondary metabolites in host plant selection of herbivorous century but were largely forgotten by the turn of the century. This insects. In his classic paper, Gottfried Fraenkel (1) pointed out that article presents the observations and studies of three protagonists secondary metabolites in plants function to repel or attract herbiv- of chemical ecology: Anton Kerner von Marilaun (1831–1898, orous insects. In the 1960s the newly reemerging field of chemical Innsbruck, Austria, and Vienna, Austria), who mainly studied the ecology began to prosper as the importance of plant secondary impact of geological, climatic, and biotic factors on plant distribu- metabolites in the interactions of plants with their environment was tion and survival; Le´o Errera (1858–1906, Brussels, Belgium), a plant grounded in measurement and observations (2).
    [Show full text]
  • Chemical Ecology
    Proc. Natl. Acad. Sci. USA Vol. 92, pp. 75-82, January 1995 Colloquium Paper This paper was presented at a coUoquium entitled "Chemical Ecology: The Chemistry ofBiotic Interaction, " organized by a committee chaired by Jerrold Meinwald and Thomas Eisner, held March 25 and 26, 1994, at the National Academy of Sciences, Washington, DC. Chemical ecology: A view from the pharmaceutical industry (molecular evolution/natural product screens/scaffold/genetic code/combinatorial chemistry) LYNN HELENA CAPORALE Merck Research Laboratories, P.O. Box 2000, Rahway, NJ 07065 ABSTRACT Biological diversity reflects an underlying ulcers, and many bacterial infections (for examples, see ref. 1). molecular diversity. The molecules found in nature may be For other devastating diseases, such as diabetes, cancer, AIDS, regarded as solutions to challenges that have been confronted stroke, and Alzheimer disease, at best only inadequate therapy and overcome during molecular evolution. As our understand- is available; new approaches to treat these diseases are sought ing ofthese solutions deepens, the efficiency with which we can intensively by researchers within the pharmaceutical industry discover and/or design new treatments for human disease and elsewhere. In the future, new infectious agents may be grows. Nature assists our drug discovery efforts in a variety expected to emerge as important threats, much as human ofways. Some compounds synthesized by microorganisms and immunodeficiency virus (HIV) has challenged us. Because of plants are used directly as drugs. Human genetic variations the magnitude of these challenges, we continue to seek to that predispose to (or protect against) certain diseases may improve the strategies by which we discover new drugs.
    [Show full text]
  • Phycotoxins by Harmful Algal Blooms (HABS) and Human Poisoning: an Overview
    International Clinical Pathology Journal Review Article Open Access Phycotoxins by harmful algal blooms (HABS) and human poisoning: an overview Abstract Volume 2 Issue 6 - 2016 Phycotoxins are potent natural toxins synthesized by certain marine algae and cyanobacteria species during “Harmful Algal Blooms”, (HABs), often seen as water Olga M Pulido discoloration known as “Red Tides”, “Green Tides”. They are grouped by chemical Department of Pathology and Laboratory Medicine, University structure, mechanisms of action, target tissues, biological and health effects. A of Ottawa, Canada constant threat to public health, and economy, environmental contaminants in aquatic ecosystems, seafood, drinking water, requiring multidisciplinary action at the local Correspondence: Olga M Pulido, Department of Pathology and international level to manage their potentially harmful effects. The 2015 bloom of and Laboratory Medicine, University of Ottawa, Ottawa, toxigenic Pseudo-nitzschia along the west coast of North America resulted in domoic Ontario, Canada, Email [email protected] acid contamination of crab and clams, numerous harvesting closures and Consumer Received: September 21, 2016 | Published: September 26, Warning issued by local public health authorities. Thereafter, in September 2016 the 2016 Oregon coast was closed to razor clam and mussel harvesting. Whereas, the massive cyanobacteria blooms reported in Florida in June 2016 lead to banning drinking water in some locations. Public health vigilance, monitoring, and research need to be maintained and enhanced. Despite scientific advancements, phycotoxin research relating to human exposure and health consequences are sparse, while, blooms of toxigenic species have become more prevalent worldwide. At present, phycotoxins poisonings diagnosis and management is largely based on the ability of health care provider to interpret presenting clinical symptoms, collect exposure history, identify and establish the exposure event.
    [Show full text]
  • Chemical Ecology = Chemistry + Ecology!*
    Pure Appl. Chem., Vol. 79, No. 12, pp. 2305–2323, 2007. doi:10.1351/pac200779122305 © 2007 IUPAC Chemical ecology = chemistry + ecology!* Gunnar Bergström‡ Chemical Ecology, Göteborg University, Kolonigatan 3, SE-41321 Göteborg, Sweden Abstract: Chemical ecology (CE) is an active, interdisciplinary field between chemistry and biology, which, stimulated by natural curiosity and possible applied aspects, has grown to its present position during the last 40-odd years. This area has now achieved a degree of matu- rity with its own journals, its own international society with annual meetings, and many en- thusiastic scientists in laboratories around the world. The focus is on chemical communica- tion and other chemical interactions between organisms, including volatile chemical signals, which guide behaviors linked to various vital needs. It reflects both biodiversity and chemodiversity. All living organisms have these important signal systems, which go back to the origins of life. Successful work in this area has called for close collaboration between chemists and biologists of different descriptions. It is thus a good example of chemistry for biology. The aim of the article is to give a short introduction to the field, with an emphasis on the role of chemistry in a biological context by • giving an overview of the development of the area; • showing some examples of studies of chemical communication in insects and plants, basically from our own work; and • describing some current trends and tendencies and possible future developments. Keywords: chemical ecology; chemistry; ecology; interdisciplinary field; insects; plants; be- haviors; pheromones; chemical signals; semiochemicals. CHEMICAL ECOLOGY—AN INTERDISCIPLINARY SCIENCE: HOW DID IT COME ABOUT? Females of the great peacock moth, Saturnia pyri, attract males from far away, several hundred meters.
    [Show full text]
  • Tolerance and Sequestration of Macroalgal Chemical Defenses by an Antarctic Amphipod: a ‘Cheater’ Among Mutualists
    Vol. 490: 79–90, 2013 MARINE ECOLOGY PROGRESS SERIES Published September 17 doi: 10.3354/meps10446 Mar Ecol Prog Ser FREEREE ACCESSCCESS Tolerance and sequestration of macroalgal chemical defenses by an Antarctic amphipod: a ‘cheater’ among mutualists Margaret O. Amsler1, Charles D. Amsler1,*, Jacqueline L. von Salm2, Craig F. Aumack1,3, James B. McClintock1, Ryan M. Young2, Bill J. Baker2 1Department of Biology, University of Alabama at Birmingham, Birmingham, Alabama 35294-1170, USA 2Department of Chemistry, University of South Florida, Tampa, Florida 33620, USA 3Present address: Department of Biology and Paleo Environment, Lamont-Doherty Earth Observatory, Palisades, New York 10964-8000, USA ABSTRACT: Shallow-water communities along the western Antarctic Peninsula support forests of large, mostly chemically defended macroalgae and dense assemblages of macroalgal-associated amphipods, which are thought to exist together in a community-wide mutualism. The amphipods benefit the chemically defended macrophytes by consuming epiphytic algae and in turn benefit from an associational refuge from fish predation. In the present study, we document an exception to this pattern. The amphipod Paradexamine fissicauda is able to consume Plocamium carti- lagineum and Picconiella plumosa, 2 species of sympatric, chemically defended red macroalgae. In previous studies, Plocamium cartilagineum was one of the most strongly deterrent algae in the community to multiple consumers, and was found here to be unpalatable to 5 other amphipod spe- cies which utilize it as a host in nature. Paradexamine fissicauda maintained on a diet of Ploca - mium cartilagineum for 2 mo were much less likely to be eaten by fish than Paradexamine fissi- cauda maintained on a red alga which does not elaborate chemical defenses, or than a different but morphologically similar sympatric amphipod species.
    [Show full text]
  • Chapter 6 Chemical Cues That Indicate Risk of Predation
    Chapter 6 Chemical Cues That Indicate Risk of Predation Brian D. Wisenden Minnesota State University Moorhead, Moorhead, Minnesota, USA 6.1 INTRODUCTION Chemical cues released passively as a by-product of ecological interactions provide a rich and reliable source of public information to guide behavioral decision-making. Predation is an omnipresent and unforgiving agent of selection that is reliably correlated with context-specific chemical cues. Consequently, natural selection has led fish to evolve finely tuned mechanisms to first detect chemical information about predation risk and then execute adaptive behavioral responses to minimize exposure to these risks. The regular interval of reviews of this topic (Smith, 1992; Chivers and Smith, 1998; Wisenden, 2003; Wisenden and Stacey, 2005; Wisenden and Chivers, 2006; Ferrari, Wisenden, and Chivers, 2010; Chivers, Brown, and Ferrari, 2013) reflects the pace and volume of new research on how fish and other aquatic animals use chemical information to ameliorate predation risk. In this chapter, the principal sources of chemical information about predation risk and the large and active literature on how injury-released chemical alarm cues from conspecifics mediate these interactions are briefly reviewed. Alarm cues are chemicals released by cells and tissues of prey dam- aged in the process of a predator attack. Because alarm cues are released only in the context of predation, they reliably inform nearby receivers of the presence of an actively foraging predator. Thus, there is strong selection on receivers to elaborate mechanisms to detect and discern the quality of this information and to respond accordingly. I focus on these interactions because conspecific chemical alarm cues are the class of compounds and mixtures that come closest to the concept of pheromone.
    [Show full text]
  • Sensorialidad Vibratoria En Tabaco: Respuestas Químicas Y Efectos Sobre La Producción Foliar
    SENSORIALIDAD VIBRATORIA EN TABACO: RESPUESTAS QUÍMICAS Y EFECTOS SOBRE LA PRODUCCIÓN FOLIAR Tesis Entregada a la Universidad de Chile en Cumplimiento parcial de los requisitos para optar al grado de Magíster en Ciencias Biológicas Facultad de Ciencias Por: Daniel Torrico Bazoberry Director de Tesis: Dr. Hermann M. Niemeyer Co-director de Tesis: Dr. Carlos F. Pinto Santiago, Noviembre 2018 FACULTAD DE CIENCIAS UNIVERSIDAD DE CHILE INFORME DE APROBACIÓN TESIS DE MAGÍSTER Se informa a la Escuela de Postgrado de la Facultad de Ciencias que la Tesis de Magíster presentada por el candidato: Daniel Torrico Bazoberry Ha sido aprobada por la comisión de Evaluación de la tesis como requisito para optar al grado de Magíster en Ciencias Biológicas, en el examen de Defensa Privada de Tesis rendido el día 12 de octubre de 2018. Director de Tesis: Dr. Hermann M. Niemeyer ................. Co-Director de Tesis: Dr. Carlos F. Pinto ................. Comisión de Evaluación de la Tesis: Dr. Carezza Botto ................. Dr. Ramiro Bustamante ................. A mis padres, por su cariño y apoyo constante e incondicional ii BIOGRAFÍA Nací en Cochabamba, la capital gastronómica de Bolivia, el año 1991. Desde muy pequeño tuve un gran interés en ser científico, sin siquiera saber en ese entonces las labores que uno desarrollaba. A los 17 años ingresé a la carrera de Biología en la Universidad Mayor de San Simón, donde obtuve mi título el año 2014. Mi tesis de grado fue evaluar la selección natural en rasgos morfológicos en mi insecto favorito Alchisme grossa. El año 2011 pude conocer el área de la Ecología Química y gracias a LANBIO tuve la oportunidad de tener cursos tanto en Bolivia como en Chile; además, pude realizar dos pasantías en el Laboratorio de Química Ecológica de la Universidad de Chile: la primera el año 2012 y la segunda el año 2014.
    [Show full text]