DOCSLIB.ORG

Rabidosa Rabida

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Rabidosa Rabida The effect of herbicide on activity level and chemically-mediated antipredator responses in wolf spiders Joar C. Mejia Feliz & Matthew Persons Neuroscience & Biomedical Science Programs, Susquehanna university, Selinsgrove, PA 17870 ABSTRACT A METHODS Spiderlings of the wolf spider Rabidosa rabida show innate effective antipredator responses (freezing) in the presence of silk and excreta cues of the syntopic intraguild predatory spider, Pardosa milvina. Both species are Figure 1. Predator commonly found in agricultural systems where herbicides may interfere with predator-prey dynamics within adult female these species. Published studies indicate that a variety of environmental factors may degrade or modify spider Pardosa milvina (A) silk and therefore could potentially influence the ability of predator cues to inform antipredator decisions in and prey, prey spiders. Some herbicides may act as a stimulant and increase the activity level of wolf spiders. We tested spiderlings of the the effect of dicamba on three aspects of Rabidosa and Pardosa behavior. We measured the effect of spraying species Rabidosa Figure 3. Using small containers, we sprayed a soil dicamba on the ability of Rabidosa spiderlings to detect silk and excreta cues from Pardosa. We also tested if rabida (B). substrate with either water or a field-dosage of dicamba. dicamba sprayed before or after Pardosa silk deposition influenced freezing responses and subsequent Spiderlings are After waiting one hour, we placed a single Rabidosa Figure 4. A second set of predation trials occurred following both predation in Rabidosa when paired with a live Pardosa predator. In a second experiment we measured both B spiderling or adult Pardosa onto the substrate for seven species of spiders being placed in either dicamba or water treated shown here on Figure 2. Six treatments in which predation trials between a spiderling of activity level and predation frequency of Pardosa on Rabidosa when Pardosa, Rabidosa, or both spiders were days. At the end of seven days, we removed the spiders substrates for a week. The species were then paired in 4 different their mother’s back the Rabidosa rabida subspecies and a subadult Pardosa milvina species ways so that we could explore the differences in predation based on chronically exposed to herbicide-treated soils over a one-week period. Dicamba sprayed on substrates with occurred. The presence and order in which Pardosa cues and type of and measured their activity as time spent moving during just prior to previous herbicide exposure. Dicamba treated Pardosa were predator cues from Pardosa did not significantly influence Rabidosa survival or Pardosa attack latency when wetting was applied defined the groups. Trials occurred in either water or a 10-minute observation period (N=200). These spiders measured against both a Rabidosa placed on dicamba-sprayed soil or Rabidosa wasn’t previously exposed to predator cues; however, Rabidosa and Pardosa both increased activity dispersing into the vanquish treatments. A one-hour drying period followed the wetting of were also used in a predation experiment (see Figure 4). control soil. Additionally, a Pardosa that was placed in water for a environment. the substrates before the spiders were placed in the substrates. Four week was tested against both a Rabidosa placed in vanquish and one level when exposed for one week to dicamba substrates. We also found significant differences in Rabidosa treatments had the presence of cues placed overnight by subadult survival with a live Pardosa when exposed for at least 24 hours with predator cues depending on if the placed in water. There was one control group in which both spiders Pardosa milvina which were then removed before predation trials and were placed in water and there was no predator cues. predator and/or prey was exposed to dicamba. Our findings suggest that dicamba may mediate silk-cued reintroduced at the same time as prey spiders. (N=168, n=28) predator-prey interactions in these species particularly when the prey have been previously primed with predator silk cues. Results SUMMARY & CONCLUSIONS INTRODUCTION Does the herbicide dicamba impair detection of chemical information about predators? Dicamba application on spider chemical cues (silk and excreta) had no effect on Pardosa 3000 predation on Rabidosa (Fig. 5). Order of wetting or the presence of predator cues had no Wolf spiders frequently feed on other wolf spider species. Many prey species can detect silk and Figure 5. Mean predation latency (±SE) between excreta cues produced from larger predatory wolf spiders and use this information to avoid being 2500 the predator Pardosa and prey Rabidosa. significant effect on the survival of Rabidosa. Since these were predator-naieve Rabidosa eaten. These cues (kairomones) can contain specific information about predation risk including 2000 Spraying water or herbicide on predator cues spiderlings without prior exposure to predator cues, they may not have had sufficient time to the predator’s diet (Persons et al. 2001), how long since it left the area (Barnes et al. 2002) and its 1500 had no effect on predation time between become sensitized to these cues which is known to enhance antipredator responses to hunger level (Bell et al. 2006). Detection of these predator cues by prey induces a freeze response 1000 Pardosa and Rabidosa (One-way ANOVA, chemical cues (Eiben et al. 2007). that enhances survival in the presence of a live predator (Persons et al., 2002). Prey spiders F5,136=0.792; p<.5574, N=168). without access to silk cues typically suffer high mortality rates from these predatory spiders. 500 Predation Latency (sec) Latency Predation 0 Dicamba exposure increased activity levels of both the predator and prey spiders and Control Dicamba Predator Dicamba Predator Water then Many wolf spider species are agrobionts, occurring year-round within agricultural systems Water Only Only w/o Cues then then Cues Only Predator Pardosa showed much higher activity than Rabidosa (Fig. 6). Since Pardosa were adults and w/o Predator Predator sprayed with Predator Cues worldwide. Since they live on the ground they are especially susceptible to direct spraying of Cues Cues Dicamba Cues Rabidosa were spiderlings, it is unclear if the differences between these two species reflect herbicides during the pre-emergence phase of the growing season. Although the lethal effects of Herbicide treatment species differences, developmental differences or both. In other species juvenile wolf spiders Does the chronic exposure to the herbicide dicamba change activity level of predator some herbicides, particularly glyphosate and atrazine, have been studied in spiders, most do show lower activity level than adults (Persons, 1999) which may reflect size-based sublethal effects of other herbicides on ground spiders have been understudied and none have and prey wolf spiders? differences in predation risk. Dicamba may have a stimulatory effect on wolf spiders and the examined how herbicides may interfere with how chemical cues mediate predator-prey 80 No Dicamba Figure 6. Mean time (±SE) Pardosa and Rabidosa increased activity could compromise freeze responses. interactions among different lycosid species (Pekar 2012). Since herbicides can change activity 70 levels in wolf spiderr (Korenko et al., 2019) presumably they could have negative or positive Dicamba spent moving during a 10-minute activity test. effects on predator-cue induced freeze responses while other studies suggest that wetting these 60 Pardosa moved significantly more than Rabidosa Chronic exposure to dicamba significantly affected predation time but had different effects spider predator cues can disrupt antipredator responses (Wilder et al. 2005). 50 (Species: F=89.7; p=0.0001) and both species on each spider species (Fig. 7). Since long-term herbicide exposure increases activity while 40 moved more after being exposed one-week to the herbicide dicamba (Herbicide: F =7.65; predator cues decrease it, these counteracting stimuli may result in complex feeding Spiderlings of the wolf spider Rabidosa rabida show innate freeze responses to silk cues from the 30 1,196 responses that are difficult to predict when only one spider is exposed. Rabidosa survival larger predator Pardosa milvina and become primed or sensitized to these cues after 24 hours of p=0.006). There was no interaction between 20 species and herbicide (Species*Herbicide:F=2.0; was longest when Pardosa had been exposed to dicamba but the same pattern didn’t occur exposure to them (Eiben & Persons, 2007). Rabidosa also survives longer when exposed to both (s) moving Time spent these cues and a live Pardosa (Eiben & Persons, 2007). Both species are common in agricultural 10 p=0.15, N=200) when only Rabidosa was exposed. Given that these spiders often occupy strip crop systems 0 systems throughout the Eastern US where they are prone to frequent exposure to herbicides. Pardosa Rabidosa where sprayed and non-sprayed fields may occur within 25 meters or less apart, it is likely Here we tested if the common herbicide, dicamba interferes with detection of predator cues, (predator) (prey) that wolf spiders encounter other individuals with highly variable differences in herbicide changes activity level of predatory and prey wolf spiders after a week-long exposure, and if Does chronic exposure to dicamba of predator and prey wolf spiders change survival exposure. Since a single species of wolf spider can consume an estimated half a million prey chronic exposure to this herbicide shifts survival probability of Rabidosa in the presence of per acre per week within a crop system, the indirect effects of herbicides on biocontrol of Pardosa with and without predator cues present. probabilities? pests may be considerable but remain largely unexamined. 1600 B Figure 7. Mean survival time (±SE) of spiderlings of 1400 B the species Rabidosa when paired with the predator REFERENCES 1200 Persons, M.H.^., Walker, S.E., Rypstra, A.L. & S.D. Marshall. 2001. Wolf spider predator avoidance tactics and survival in the presence of diet-associated predator AB Pardosa.
Load more

Recommended publications
  • A Protocol for Online Documentation of Spider Biodiversity Inventories Applied to a Mexican Tropical Wet Forest (Araneae, Araneomorphae)
    Zootaxa 4722 (3): 241–269 ISSN 1175-5326 (print edition) https://www.mapress.com/j/zt/ Article ZOOTAXA Copyright © 2020 Magnolia Press ISSN 1175-5334 (online edition) https://doi.org/10.11646/zootaxa.4722.3.2 http://zoobank.org/urn:lsid:zoobank.org:pub:6AC6E70B-6E6A-4D46-9C8A-2260B929E471 A protocol for online documentation of spider biodiversity inventories applied to a Mexican tropical wet forest (Araneae, Araneomorphae) FERNANDO ÁLVAREZ-PADILLA1, 2, M. ANTONIO GALÁN-SÁNCHEZ1 & F. JAVIER SALGUEIRO- SEPÚLVEDA1 1Laboratorio de Aracnología, Facultad de Ciencias, Departamento de Biología Comparada, Universidad Nacional Autónoma de México, Circuito Exterior s/n, Colonia Copilco el Bajo. C. P. 04510. Del. Coyoacán, Ciudad de México, México. E-mail: [email protected] 2Corresponding author Abstract Spider community inventories have relatively well-established standardized collecting protocols. Such protocols set rules for the orderly acquisition of samples to estimate community parameters and to establish comparisons between areas. These methods have been tested worldwide, providing useful data for inventory planning and optimal sampling allocation efforts. The taxonomic counterpart of biodiversity inventories has received considerably less attention. Species lists and their relative abundances are the only link between the community parameters resulting from a biotic inventory and the biology of the species that live there. However, this connection is lost or speculative at best for species only partially identified (e. g., to genus but not to species). This link is particularly important for diverse tropical regions were many taxa are undescribed or little known such as spiders. One approach to this problem has been the development of biodiversity inventory websites that document the morphology of the species with digital images organized as standard views.
    [Show full text]
  • Arthropods of Elm Fork Preserve
    Arthropods of Elm Fork Preserve Arthropods are characterized by having jointed limbs and exoskeletons. They include a diverse assortment of creatures: Insects, spiders, crustaceans (crayfish, crabs, pill bugs), centipedes and millipedes among others. Column Headings Scientific Name: The phenomenal diversity of arthropods, creates numerous difficulties in the determination of species. Positive identification is often achieved only by specialists using obscure monographs to ‘key out’ a species by examining microscopic differences in anatomy. For our purposes in this survey of the fauna, classification at a lower level of resolution still yields valuable information. For instance, knowing that ant lions belong to the Family, Myrmeleontidae, allows us to quickly look them up on the Internet and be confident we are not being fooled by a common name that may also apply to some other, unrelated something. With the Family name firmly in hand, we may explore the natural history of ant lions without needing to know exactly which species we are viewing. In some instances identification is only readily available at an even higher ranking such as Class. Millipedes are in the Class Diplopoda. There are many Orders (O) of millipedes and they are not easily differentiated so this entry is best left at the rank of Class. A great deal of taxonomic reorganization has been occurring lately with advances in DNA analysis pointing out underlying connections and differences that were previously unrealized. For this reason, all other rankings aside from Family, Genus and Species have been omitted from the interior of the tables since many of these ranks are in a state of flux.
    [Show full text]
  • Dotted Wolf Spider Rabidosa Punctulata ILLINOIS RANGE
    dotted wolf spider Rabidosa punctulata Kingdom: Animalia FEATURES Phylum: Arthropoda Like all wolf spiders, the dotted wolf spider has four, Class: Chelicerata large eyes in a trapezoid shape on the top of the Order: Araneae carapace. The two median eyes in this group of four are the largest and face forward. The two smaller eyes in Family: Lycosidae this group of four are set behind the two central eyes, ILLINOIS STATUS facing to the side or backwards. In front of these four eyes is a row of four, smaller eyes. Females are about common, native 0.43 to 0.67 inch in total body length. Males are 0.51 to 0.59 inch in total body length. The general body color is light brown. The cephalothorax has an alternating pattern of light- and dark-brown stripes. The abdomen has a dark band in the center that does not show any spots. The underside of the abdomen has numerous brown spots. BEHAVIORS This is a nocturnal species that is found in tall grasses and weeds. Adults are present in the fall of the year with mating in November. Females overwinter and lay eggs in March. The adult female carries her egg sac for 30-40 days before the young emerge. They ride on her back for one to two weeks before leaving to live independently. Wolf spiders have good vision. They perform courtship rituals like waving the legs or palps with making sounds created by vibrating body parts against each other or a surface or object they are near. Wolf spiders generally ILLINOIS RANGE do not build a web but use a dragline of silk for communication.
    [Show full text]
  • SHORT COMMUNICATION Field Observations of Simultaneous Double Mating in the Wolf Spider Rabidosa Punctulata (Araneae: Lycosidae)
    2017. Journal of Arachnology 45:231–234 SHORT COMMUNICATION Field observations of simultaneous double mating in the wolf spider Rabidosa punctulata (Araneae: Lycosidae) Matthew H. Persons: Department of Biology, Susquehanna University, Selinsgrove, Pennsylvania 17870, USA; E-mail: [email protected] Abstract. Males of many species of spider engage in alternative mating tactics that do not involve pre-mating courtship. Here I report field observations of a novel opportunistic mating tactic of the wolf spider Rabidosa punctulata (Hentz, 1844): simultaneous double mating, whereby males that encounter copulating pairs also mount and achieve inseminations concurrently with the first male. On three separate occasions, female R. punctulata were observed mating with two males simultaneously. Males that mate with already copulating females likely receive multiple fitness benefits. It may allow courtship parasitism of other males while also reducing male agonistic interactions, eliminate the need to court or subdue the female, and reduce pre-mating cannibalism risk. If such behavior is common, it may limit sexual selection acting on male courtship displays by reducing the effectiveness of pre-mating female choice while also increasing sperm competition. Keywords: Polygynandry, lycosid, threesome, satellite male, sperm competition Males of many species of spider engage in alternative or discovered already mounted on the female. Mounting time lasted opportunistic reproductive tactics to maximize fitness under different for 43 minutes and 61 minutes respectively for these mating triads conditions (reviewed in Robinson & Robinson 1980; Christenson between the time of discovery until one of the males dismounted. In 1984). Males may engage in sneak copulations (Elgar & Fahey 1996; both mating triads, males shifted positions until they were each able Schneider et al.
    [Show full text]
  • A First Look at the Microbial Community of Rabidosa Rabida, a Wolf Spider in Searcy, Arkansas Patricia Rivera Harding University, [email protected]
    Journal of the Arkansas Academy of Science Volume 71 Article 13 2017 A First Look at the Microbial Community of Rabidosa rabida, a Wolf Spider in Searcy, Arkansas Patricia Rivera Harding University, [email protected] Ryan Stork Harding University, [email protected] Amber Hug Harding University, [email protected] Follow this and additional works at: http://scholarworks.uark.edu/jaas Part of the Environmental Microbiology and Microbial Ecology Commons, Medicine and Health Sciences Commons, and the Zoology Commons Recommended Citation Rivera, Patricia; Stork, Ryan; and Hug, Amber (2017) "A First Look at the Microbial Community of Rabidosa rabida, a Wolf Spider in Searcy, Arkansas," Journal of the Arkansas Academy of Science: Vol. 71 , Article 13. Available at: http://scholarworks.uark.edu/jaas/vol71/iss1/13 This article is available for use under the Creative Commons license: Attribution-NoDerivatives 4.0 International (CC BY-ND 4.0). Users are able to read, download, copy, print, distribute, search, link to the full texts of these articles, or use them for any other lawful purpose, without asking prior permission from the publisher or the author. This Article is brought to you for free and open access by ScholarWorks@UARK. It has been accepted for inclusion in Journal of the Arkansas Academy of Science by an authorized editor of ScholarWorks@UARK. For more information, please contact [email protected], [email protected]. Journal of the Arkansas Academy of Science, Vol. 71 [2017], Art. 13 A First Look into the Microbial Community of Rabidosa rabida, a Wolf Spider in Searcy, Arkansas P. Rivera*, R.J.
    [Show full text]
  • Araneae (Spider) Photos
    Araneae (Spider) Photos Araneae (Spiders) About Information on: Spider Photos of Links to WWW Spiders Spiders of North America Relationships Spider Groups Spider Resources -- An Identification Manual About Spiders As in the other arachnid orders, appendage specialization is very important in the evolution of spiders. In spiders the five pairs of appendages of the prosoma (one of the two main body sections) that follow the chelicerae are the pedipalps followed by four pairs of walking legs. The pedipalps are modified to serve as mating organs by mature male spiders. These modifications are often very complicated and differences in their structure are important characteristics used by araneologists in the classification of spiders. Pedipalps in female spiders are structurally much simpler and are used for sensing, manipulating food and sometimes in locomotion. It is relatively easy to tell mature or nearly mature males from female spiders (at least in most groups) by looking at the pedipalps -- in females they look like functional but small legs while in males the ends tend to be enlarged, often greatly so. In young spiders these differences are not evident. There are also appendages on the opisthosoma (the rear body section, the one with no walking legs) the best known being the spinnerets. In the first spiders there were four pairs of spinnerets. Living spiders may have four e.g., (liphistiomorph spiders) or three pairs (e.g., mygalomorph and ecribellate araneomorphs) or three paris of spinnerets and a silk spinning plate called a cribellum (the earliest and many extant araneomorph spiders). Spinnerets' history as appendages is suggested in part by their being projections away from the opisthosoma and the fact that they may retain muscles for movement Much of the success of spiders traces directly to their extensive use of silk and poison.
    [Show full text]
  • Rabid Wolf Spider Rabidosa Rabida ILLINOIS RANGE
    rabid wolf spider Rabidosa rabida Kingdom: Animalia FEATURES Phylum: Arthropoda Like all wolf spiders, the rabid wolf spider has four, large Class: Chelicerata eyes in a trapezoid shape on the top of the carapace. Order: Araneae The two median eyes in this group of four are the largest and face forward. The two smaller eyes in this group of Family: Lycosidae four are set behind the two central eyes, facing to the ILLINOIS STATUS side or backwards. In front of these four eyes is a row of four, smaller eyes. Females range from 0.63 to 0.83 inch common, native in total body length. Males are about 0.43 to 0.47 inch in total body length. The body color is generally light brown. The cephalothorax has a pattern of alternating longitudinal light and dark stripes. The dorsal side of the abdomen has a light stripe in the middle and paired, light spots toward the back. The male’s front legs are black. BEHAVIORS This species is found in prairies, woodlands, pastures and other open areas where it is common in tall grasses. It hunts at night and in the day. Adults are active June through October. Females with egg sacs are present from July through October. This species sometimes wraps its prey in silk. Wolf spiders have good vision. They perform courtship rituals like waving the legs or palps with making sounds created by vibrating body parts against each other or a surface or object they are near. Wolf spiders generally do not build a web but use a ILLINOIS RANGE dragline of silk for communication.
    [Show full text]
  • The Complexities of Wolf Spider Communication Exploring Courtship Signal Function in Rabidosa Rabida
    University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln Dissertations and Theses in Biological Sciences Biological Sciences, School of 7-2011 The Complexities of Wolf Spider Communication Exploring Courtship Signal Function in Rabidosa rabida Dustin J. Wilgers University of Nebraska - Lincoln, [email protected] Follow this and additional works at: https://digitalcommons.unl.edu/bioscidiss Part of the Life Sciences Commons Wilgers, Dustin J., "The Complexities of Wolf Spider Communication Exploring Courtship Signal Function in Rabidosa rabida" (2011). Dissertations and Theses in Biological Sciences. 31. https://digitalcommons.unl.edu/bioscidiss/31 This Article is brought to you for free and open access by the Biological Sciences, School of at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in Dissertations and Theses in Biological Sciences by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. THE COMPLEXITIES OF WOLF SPIDER COMMUNICATION: EXPLORING COURTSHIP SIGNAL FUNCTION IN RABIDOSA RABIDA by Dustin J. Wilgers A DISSERTATION Presented to the Faculty of The Graduate College at the University of Nebraska In Partial Fulfillment of Requirements For the Degree of Doctor of Philosophy Major: Biologcal Sciences (Ecology, Evolution, & Behavior) Under the Supervision of Professor Eileen A. Hebets Lincoln, Nebraska July, 2011 THE COMPLEXITIES OF WOLF SPIDER COMMUNICATION: EXPLORING COURTSHIP SIGNAL FUNCTION IN RABIDOSA RABIDA Dustin J. Wilgers, Ph.D. University of Nebraska, 2011 Advisor: Eileen A. Hebets Evidence of signal complexity is seemingly pervasive across animal communication systems. Exploring signal function may provide insight into how these displays evolved and are maintained. This dissertation examines the courtship signal function in a grassland wolf spider.
    [Show full text]
  • Dimorphic Jumper Maevia Inclemens (Walckenaer 1837) (Arachnida: Araneae: Salticidae)1 Laurel Lietzenmayer and Lisa Taylor2
    EENY-702 Dimorphic Jumper Maevia inclemens (Walckenaer 1837) (Arachnida: Araneae: Salticidae)1 Laurel Lietzenmayer and Lisa Taylor2 Introduction Description Maevia inclemens is a common jumping spider (Family Maevia inclemens is a medium-sized jumping spider with Salticidae) distributed throughout eastern North America, females larger than males. Females are 6.5–10.0 mm and primarily found along tree lines in vines and ivy (Bradley males are 4.8–7.0 mm in total body length (Bradley 2012). 2012). Like most jumping spiders, Maevia inclemens is Females have a white face and two red or black lines down a voracious generalist predator that feeds on a variety of the back of their abdomens (Bradley 2012, Figure 2). The small insects and other arthropods. Curiously, Maevia tufted morph is characterized by three tufts of hair that inclemens is the only known jumping spider (from a family protrude from their head, with a black body, and white of nearly 6,000 species) (World Spider Catalog 2017) legs (Figure 3A–B). The striped morph (known commonly to have dimorphic males; these two types of males (or as the gray morph) has yellow pedipalps (small append- morphs) differ in both morphology and courtship behavior ages near their face), black-and-white striped legs, and a and are found in roughly equal frequency in a population grey abdomen with subtle orange markings (Clark and (Clark and Uetz 1990). Uetz 1993; Clark and Morjan 2001, Figure 1, 3C–D). It is currently unknown what factors determine which morph a male will become, and it is difficult to predict what morph a juvenile spider will become as an adult.
    [Show full text]
  • All Species 2019
    Study List of Common Insects in Texas (August 2019) How to use this list This document presents information about each species that is required for the identification portion of 4-H Entomology. The text in the html version and this PDF version is the same. However, because this version is primarily intended to be printed, the photos are smaller and fewer than those available in the html version. Students will also want to study the html version with its larger photos. The column entitled ʻLevelʼ indicates whether the species is required at the Junior, Intermediate or Senior level. Level Common Name Order Host or Location Significance J Silverfish Thysanura House Pest I Mayflies Ephemeroptera Near water Inconsequential J Black-winged damselfly Odonata Stream Beneficial J Green darner Odonata Stream Beneficial I Stoneflies Plecoptera Near water Inconsequential I Banded-winged grasshopper Orthoptera Pasture Pest J Differential grasshopper Orthoptera Pasture Pest J Long-horned grasshoppers Orthoptera Shrubs/grass Pest J Field cricket Orthoptera Outdoors, Pest I Mole crickets Orthoptera Sandy soil Pest I True katydid Orthoptera Trees Pest J American cockroach Blattodea House Pest I German cockroach Blattodea House Pest I Smokeybrown cockroach Blattodea House Pest I Termites Blattodea Wood, stumps Pest J Praying mantids Mantodea Shrubs, vegetation Beneficial J Walkingsticks Phasmatodea Shrubs, vegetation Inconsequential I Earwigs Dermaptera Leaf litter Inconsequential I Barklice Psocoptera Tree trunk Pest I Chicken head louse Phthiraptera (Mallophaga)
    [Show full text]
  • Common Spiders (Arachnida: Araneae) in the Wichita Mountains and Surrounding Areas
    Common Spiders (Arachnida: Araneae) in the Wichita Mountains and Surrounding Areas Angel A. Chiri Entomologist and abdomen) and does not include legs. Introduction Although this guide is primarily for spiders, harvestmen, scorpions, ticks, and sun spiders are Spiders belong in the Phylum Arthropoda, Class briefly mentioned. Arachnida, Order Araneae. These common arachnids are found in grasslands, forests, orchards, cultivated fields, backyards, gardens, empty lots, parks, and homes. There are some 570 genera and 3,700 species of spiders in North America, north of Mexico. According to an Oklahoma State University checklist at least some 187 genera and 432 species were recorded in the state. Cokendolpher and Bryce (1980) examined arachnid specimens collected at the Wichita Mountains Wildlife Refuge by various groups between 1926 and 1978. Their work yielded a total of 182 arachnid species, of which 170 were spiders. Figure 1. Texas brown tarantula, Aphonopelma hentzi, male Many spiders are common and distinctive, often seen resting on their webs or crawling on the Summary of Structure and Function ground during the warmer months. The larger orb-weavers, for instance, are readily noticed in Being arthropods, spiders have a rigid external late summer and early fall because of their size skeleton, or exoskeleton, and jointed legs. The and conspicuousness. Others are uncommon or spider body consists of two segments, the seldom seen because of their secretive habits or cephalothorax (anterior segment) and the small size. For instance, some spiders that live abdomen (posterior segment), joined by a short, in leaf litter are minute, cryptic, and seldom thin, flexible pedicel. The dorsal part of the noticed without the use of special collecting cephalothorax is the carapace.
    [Show full text]
  • For Review Only Ecology Page 2 of 94
    Ecology Functional diversity positively affects prey suppression by invertebrate predators: a meta-analysis Journal: Ecology ManuscriptFor ID ECY17-0800.R3 Review Only Wiley - Manuscript type: Articles Date Submitted by the Author: n/a Complete List of Authors: Greenop, Arran; Centre for Ecology and Hydrology, ; Lancaster Environment Centre, Woodcock, Ben; CEH Wilby, Andrew; Lancaster University Cook, Sam; Rothamsted Research Pywell, Richard; Centre for Ecology and Hydrology, UK Predation < Species Interactions < Community Ecology < Substantive Area, Biological Control < Species Interactions < Community Ecology < Substantive Area: Substantive Area, Agroecosystems < Ecosystems < Substantive Area, Phylogenetics < Systematics < Population Ecology < Substantive Area, Species Interactions < Community Ecology < Substantive Area Organism: Habitat: Geographic Area: Functional diversity, Phylogenetic diversity, Predator-prey interactions, Traits, Conservation biological control, Natural enemies, Biodiversity and Additional Keywords: ecosystem functioning, Agricultural ecosystems, Ecosystem services, Species richness The use of pesticides within agricultural ecosystems has led to wide concern regarding negative effects on the environment. One possible alternative is the use of predators of pest species that naturally occur within agricultural ecosystems. However, the mechanistic basis for how species can be manipulated in order to maximise pest control remains unclear. We carried out a meta-analysis of 51 studies that manipulated predator species richness in reference to suppression of herbivore prey to Abstract: determine which components of predator diversity affect pest control. Overall, functional diversity (FD) based on predator’s habitat domain, diet breadth and hunting strategy was ranked as the most important variable. Our analysis showed that increases in FD in polycultures led to greater prey suppression compared to both the mean of the component predator species, and the most effective predator species, in monocultures.
    [Show full text]