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https://www.readbyqxmd.com/read/28425912/how-spatial-release-from-masking-may-fail-to-function-in-a-highly-directional-auditory-system
#1
Norman Lee, Andrew C Mason
Spatial release from masking (SRM) occurs when spatial separation between a signal and masker decreases masked thresholds. The mechanically-coupled ears of Ormia ochracea are specialized for hyperacute directional hearing, but the possible role of SRM, or whether such specializations exhibit limitations for sound source segregation, is unknown. We recorded phonotaxis to a cricket song masked by band-limited noise. With a masker, response thresholds increased and localization was diverted away from the signal and masker...
April 20, 2017: ELife
https://www.readbyqxmd.com/read/28410536/the-influence-of-ball-swing-on-the-timing-and-coordination-of-a-natural-interceptive-task
#2
Vishnu Sarpeshkar, David L Mann, Wayne Spratford, Bruce Abernethy
Successful interception relies on the use of perceptual information to accurately guide an efficient movement strategy that allows performers to be placed at the right place at the right time. Although previous studies have highlighted the differences in the timing and coordination of movement that underpin interceptive expertise, very little is known about how these movement patterns are adapted when intercepting targets that follow a curvilinear flight-path. The aim of this study was to examine how curvilinear ball-trajectories influence movement patterns when intercepting a fast-moving target...
April 11, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28407636/neuronal-regression-of-internal-leg-vibroreceptor-organs-in-a-cave-dwelling-insect-orthoptera-rhaphidophoridae-dolichopoda-araneiformis
#3
Johannes Strauß, Nataša Stritih
Animals' adaptations to cave habitats generally include elaboration of extraoptic senses, and in insects the receptor structures located on the legs are supposed to become more prominent in response to constant darkness. The receptors for detecting substrate vibrations are often highly sensitive scolopidial sensilla localized within the legs or the body. For troglobitic insects the evolutionary changes in vibroreceptor organs have not been studied. Since rock is an extremely unfavorable medium for vibration transmission, selection on vibration receptors may be weakened in caves, and these sensory organs may undergo regressive evolution...
April 14, 2017: Brain, Behavior and Evolution
https://www.readbyqxmd.com/read/28405468/cryptochrome-genes-form-an-oscillatory-loop-independent-of-the-per-tim-loop-in-the-circadian-clockwork-of-the-cricket-gryllus-bimaculatus
#4
Atsushi Tokuoka, Taichi Q Itoh, Shinryo Hori, Outa Uryu, Yoshiki Danbara, Motoki Nose, Tetsuya Bando, Teiichi Tanimura, Kenji Tomioka
BACKGROUND: Animals exhibit circadian rhythms with a period of approximately 24 h in various physiological functions, including locomotor activity. This rhythm is controlled by an endogenous oscillatory mechanism, or circadian clock, which consists of cyclically expressed clock genes and their product proteins. cryptochrome (cry) genes are thought to be involved in the clock mechanism, and their functions have been examined extensively in holometabolous insects, but in hemimetabolous insects their role is less well understood...
2017: Zoological Letters
https://www.readbyqxmd.com/read/28403240/snovault-and-encoded-a-novel-object-based-storage-system-and-applications-to-encode-metadata
#5
Benjamin C Hitz, Laurence D Rowe, Nikhil R Podduturi, David I Glick, Ulugbek K Baymuradov, Venkat S Malladi, Esther T Chan, Jean M Davidson, Idan Gabdank, Aditi K Narayana, Kathrina C Onate, Jason Hilton, Marcus C Ho, Brian T Lee, Stuart R Miyasato, Timothy R Dreszer, Cricket A Sloan, J Seth Strattan, Forrest Y Tanaka, Eurie L Hong, J Michael Cherry
The Encyclopedia of DNA elements (ENCODE) project is an ongoing collaborative effort to create a comprehensive catalog of functional elements initiated shortly after the completion of the Human Genome Project. The current database exceeds 6500 experiments across more than 450 cell lines and tissues using a wide array of experimental techniques to study the chromatin structure, regulatory and transcriptional landscape of the H. sapiens and M. musculus genomes. All ENCODE experimental data, metadata, and associated computational analyses are submitted to the ENCODE Data Coordination Center (DCC) for validation, tracking, storage, unified processing, and distribution to community resources and the scientific community...
2017: PloS One
https://www.readbyqxmd.com/read/28396143/lethal-effects-of-an-insecticidal-spider-venom-peptide-involve-positive-allosteric-modulation-of-insect-nicotinic-acetylcholine-receptors
#6
Monique J Windley, Irina Vetter, Richard J Lewis, Graham M Nicholson
κ-Hexatoxins (κ-HXTXs) are a family of excitotoxic insect-selective neurotoxins from Australian funnel-web spiders that are lethal to a wide range of insects, but display no toxicity towards vertebrates. The prototypic κ-HXTX-Hv1c selectively blocks native and expressed cockroach large-conductance calcium-activated potassium (BKCa or KCa1.1) channels, but not their mammalian orthologs. Despite this potent and selective action on insect KCa1.1 channels, we found that the classical KCa1.1 blockers paxilline, charybdotoxin and iberiotoxin, which all block insect KCa1...
April 8, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28390308/developing-a-food-web-based-transfer-factor-of-radiocesium-for-fish-whitespotted-char-salvelinus-leucomaenis-in-headwater-streams
#7
Md Enamul Haque, Takashi Gomi, Masaru Sakai, Junjiro N Negishi
We developed a food web-based transfer factor (TFweb) to study contaminant movements from multiple prey items to a predator based on the dietary contributions of prey items with their respective contamination levels. TFweb was used to evaluate the transfer of (137)Cs into whitespotted char (Salvelinus leucomaenis) from the trophic structure of a stream-riparian ecosystem in headwater streams draining a Japanese cedar forest. We also examined the applicability of this method by comparing sites with different contamination levels but similar surrounding environments in Fukushima and Gunma...
April 5, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28381994/losing-without-fighting-simple-aversive-stimulation-induces-submissiveness-typical-for-social-defeat-via-the-action-of-nitric-oxide-but-only-when-preceded-by-an-aggression-priming-stimulus
#8
Jan Rillich, Paul A Stevenson
Losing a fight (social defeat) induces submissiveness and behavioral depression in many animals, but the mechanisms are unclear. Here we investigate how the social defeat syndrome can be established as a result of experiencing aversive stimuli and the roles of neuromodulators in the process. While biogenic amines and nitric oxide (NO) are associated with reduced aggression in mammals and insects, their specific actions during conflict are unknown. Although the social defeat syndrome normally results from complex interactions, we could induce it in male crickets simply by applying aversive stimuli (AS) in an aggressive context...
2017: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/28374861/erratum-molecular-analysis-of-the-factorless-internal-ribosome-entry-site-in-cricket-paralysis-virus-infection
#9
Craig H Kerr, Zi Wang Ma, Christopher J Jang, Sunnie R Thompson, Eric Jan
No abstract text is available yet for this article.
April 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28369840/sexual-selection-and-population-divergence-ii-divergence-in-different-sexual-traits-and-signal-modalities-in-field-crickets-teleogryllus-oceanicus
#10
Sonia Pascoal, Magdalena Mendrok, Alastair J Wilson, John Hunt, Nathan W Bailey
Sexual selection can target many different types of traits. However, the relative influence of different sexually-selected traits during evolutionary divergence is poorly understood. We used the field cricket Teleogryllus oceanicus to quantify and compare how five traits from each of three sexual signal modalities and components diverge among allopatric populations: male advertisement song, cuticular hydrocarbon (CHC) profiles and forewing morphology. Population divergence was unexpectedly consistent: we estimated the among-population (genetic) variance-covariance matrix, D, for all 15 traits, and Dmax explained nearly two-thirds of its variation...
March 28, 2017: Evolution; International Journal of Organic Evolution
https://www.readbyqxmd.com/read/28365228/the-thoracic-morphology-of-the-wingless-dune-cricket-comicus-calcaris-orthoptera-schizodactylidae-novel-apomorphic-characters-for-the-group-and-adaptations-to-sand-desert-environments
#11
Fanny Leubner, Sven Bradler, Benjamin Wipfler
Schizodactylidae, splay-footed or dune crickets, represents a distinct lineage among the highly diverse orthopteran subgroup Ensifera (crickets, katydids and allies). Only two extant genera belong to the Schizodactylidae: the winged Eurasian genus Schizodactylus, whose ecology and morphology is well documented, and the wingless South African Comicus, for which hardly any studies providing morphological descriptions have been conducted since its taxonomic description in 1888. Based on the first in-depths study of the skeletomuscular system of the thorax of Comicus calcarisIrish 1986, we provide information on some unique characteristics of this character complex in Schizodactylidae...
March 29, 2017: Arthropod Structure & Development
https://www.readbyqxmd.com/read/28359396/patterns-and-correlates-of-physical-activity-in-adolescents-in-dhaka-city-bangladesh
#12
A Khan, N W Burton, S G Trost
OBJECTIVES: Despite the widely acknowledged public health importance of physical activity (PA), few studies have examined levels of PA in Bangladesh. The purpose of this study was to investigate the patterns and correlates of PA in adolescents in Bangladesh. STUDY DESIGN: Cross-sectional survey. METHODS: A total of 798 students, aged 13-17 years; 48% girls, from eight purposively selected secondary schools in Dhaka city, Bangladesh completed a self-administered questionnaire including the 3-Day PA Recall...
April 2017: Public Health
https://www.readbyqxmd.com/read/28337548/the-effects-of-anxiety-and-situation-specific-context-on-perceptual-motor-skill-a-multi-level-investigation
#13
Oliver R Runswick, André Roca, A Mark Williams, Neil E Bezodis, Jamie S North
We examined the effects of anxiety and situation-specific contextual information on attentional, interpretational, and behavioural processes underpinning perceptual-motor performance as proposed by Nieuwenhuys and Oudejans (Psychological Research 76:747-759; Nieuwenhuys, Oudejans, Psychological Research 76:747-759, 2012) using an in situ task. Twelve skilled cricket batsmen played against a skilled spin bowler under conditions manipulated to induce low and high levels of anxiety and the presence of low and high levels of situation-specific context...
March 23, 2017: Psychological Research
https://www.readbyqxmd.com/read/28335714/testis-specific-atp-synthase-peripheral-stalk-subunits-required-for-tissue-specific-mitochondrial-morphogenesis-in-drosophila
#14
Eric M Sawyer, Elizabeth C Brunner, Yihharn Hwang, Lauren E Ivey, Olivia Brown, Megan Bannon, Dennis Akrobetu, Kelsey E Sheaffer, Oshauna Morgan, Conroy O Field, Nishita Suresh, M Grace Gordon, E Taylor Gunnell, Lindsay A Regruto, Cricket G Wood, Margaret T Fuller, Karen G Hales
BACKGROUND: In Drosophila early post-meiotic spermatids, mitochondria undergo dramatic shaping into the Nebenkern, a spherical body with complex internal structure that contains two interwrapped giant mitochondrial derivatives. The purpose of this study was to elucidate genetic and molecular mechanisms underlying the shaping of this structure. RESULTS: The knotted onions (knon) gene encodes an unconventionally large testis-specific paralog of ATP synthase subunit d and is required for internal structure of the Nebenkern as well as its subsequent disassembly and elongation...
March 23, 2017: BMC Cell Biology
https://www.readbyqxmd.com/read/28330918/metabolic-rate-associates-with-but-does-not-generate-covariation-between-behaviours-in-western-stutter-trilling-crickets-gryllus-integer
#15
Indrikis A Krams, Petri T Niemelä, Giedrius Trakimas, Ronalds Krams, Gordon M Burghardt, Tatjana Krama, Aare Kuusik, Marika Mänd, Markus J Rantala, Raivo Mänd, Jukka Kekäläinen, Ilkka Sirkka, Severi Luoto, Raine Kortet
The causes and consequences of among-individual variation and covariation in behaviours are of substantial interest to behavioural ecology, but the proximate mechanisms underpinning this (co)variation are still unclear. Previous research suggests metabolic rate as a potential proximate mechanism to explain behavioural covariation. We measured the resting metabolic rate (RMR), boldness and exploration in western stutter-trilling crickets, Gryllus integer, selected differentially for short and fast development over two generations...
March 29, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28325969/new-world-species-of-the-genus-calliscelio-ashmead-hymenoptera-platygastridae-scelioninae
#16
Hua-Yan Chen, Lubomír Masner, Norman F Johnson
The genus Calliscelio Ashmead is presumed to be a diverse group of parasitoids of the eggs of crickets (Orthoptera: Gryllidae). A least one species has been found to be an important factor in depressing cricket pest populations. The New World species of Calliscelio are revised. Forty-two species are recognized, 3 are redescribed: Calliscelio bisulcatus (Kieffer), Calliscelio laticinctus Ashmead, Calliscelio rubriclavus (Ashmead), comb. n.; and 38 are described as new: Calliscelio absconditum Chen & Johnson, sp...
2017: ZooKeys
https://www.readbyqxmd.com/read/28298611/frequency-tuning-and-directional-sensitivity-of-tympanal-vibrations-in-the-field-cricket-gryllus-bimaculatus
#17
Martin J Lankheet, Uroš Cerkvenik, Ole N Larsen, Johan L van Leeuwen
Female field crickets use phonotaxis to locate males by their calling song. Male song production and female behavioural sensitivity form a pair of matched frequency filters, which in Gryllus bimaculatus are tuned to a frequency of about 4.7 kHz. Directional sensitivity is supported by an elaborate system of acoustic tracheae, which make the ears function as pressure difference receivers. As a result, phase differences between left and right sound inputs are transformed into vibration amplitude differences. Here we critically tested the hypothesis that acoustic properties of internal transmissions play a major role in tuning directional sensitivity to the calling song frequency, by measuring tympanal vibrations as a function of sound direction and frequency...
March 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/28298594/impacts-of-silicon-based-grass-defences-across-trophic-levels-under-both-current-and-future-atmospheric-co2-scenarios
#18
James M W Ryalls, Susan E Hartley, Scott N Johnson
Silicon (Si) has important functional roles in plants, including resistance against herbivores. Environmental change, such as increasing atmospheric concentrations of CO2, may alter allocation to Si defences in grasses, potentially changing the feeding behaviour and performance of herbivores, which may in turn impact on higher trophic groups. Using Si-treated and untreated grasses (Phalaris aquatica) maintained under ambient (400 ppm) and elevated (640 and 800 ppm) CO2 concentrations, we show that Si reduced feeding by crickets (Acheta domesticus), resulting in smaller body mass...
March 2017: Biology Letters
https://www.readbyqxmd.com/read/28278692/habitat-fragmentation-influences-gene-structure-and-gene-differentiation-among-the-loxoblemmus-aomoriensis-populations-in-the-thousand-island-lake
#19
Kun Lv, Jing Zhou, Jian-Qiang Gu, Guo-Xing Zhou, Wei Wang, Zhi-Hong Xu
Thousand Island Lake (TIL) is a fragmented landscape consisting of more than 1000 land-bridge islands isolated during reservoir formation. To evaluate the effects of fragmentation and island attributes on insect populations, we examined the genetic structure of Loxoblemmus aomoriensis, a species of cricket widely distributed in TIL, and compared genetic diversity between islands samples. Population genetic analyses was conducted based on mitochondrial DNA haplotype frequencies of 10 sample islands. By comparing three island attributes with population genetic diversity reveals that island area influenced population genetic diversity (r(2 )=( )0...
February 16, 2017: Mitochondrial DNA. Part A. DNA Mapping, Sequencing, and Analysis
https://www.readbyqxmd.com/read/28264277/new-species-of-i-endecous-i-grylloidea-phalangopsidae-luzarinae-from-the-igua%C3%A3-u-national-park-brazil-including-bioacoustics-cytogenetic-and-distribution-data
#20
Pedro G B Souza-Dias, Neucir Szinwelski, Marcos Fianco, Elliott Centeno DE Oliveira, Francisco DE A G DE Mello, Edison Zefa
In this study we describe two new species of cavicolous-straminicolous crickets for southern Brazil. Endecous chape n. sp. and E. naipi n. sp. are sympatric crickets that inhabit the Atlantic Semideciduous Forest of the Iguaçu National Park and adjacent areas. The descriptions were based on morphological characters, mainly from male genitalia and tegmina of adult males. Furthermore, we describe the chromosomes and the calling song of one of the new species, E. chape n. sp., presenting a discussion about the morphology of the phallic complex of Endecous and a distribution map for the species of the genus...
March 1, 2017: Zootaxa
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