DOCSLIB.ORG

DOCTORAL THESIS the Influence of Hydrogeology and the Devensian

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
DOCTORAL THESIS the Influence of Hydrogeology and the Devensian DOCTORAL THESIS The influence of hydrogeology and the Devensian glaciation on hyporheic communities of the UK Dunscombe, Mark Award date: 2012 General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. • Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Download date: 06. Oct. 2021 The influence of hydrogeology and the Devensian glaciation on hyporheic communities of the UK Mark Dunscombe BSc MSc A thesis submitted in partial fulfilment of the requirements for the degree of PhD Department of Life Sciences Roehampton University University of Surrey 2011 1 Abstract Ecologically, the hyporheic zone (HZ) performs numerous roles within stream ecosystems (e.g. habitat, refugia from floods and droughts, nutrient cycling, pollution attenuation) with the dominant control on these various roles sediment composition. Recently, the body of literature on the role of sediment in the HZ has grown, though these studies rarely extend beyond the reach scale with little regional scale research undertaken in England and Wales. In this thesis, meio- and macrofaunal hyporheic assemblages at two depths (20cm and 50cm) across four geological regions (chalk – fine sediment, sandstone - fine to medium sediment and limestone – coarse sediment) two seasons (summer (n = 396) and winter (n = 192)) are described. The influence of recent glaciations (Devensian) on the distribution of stygobite fauna (summer (n = 192) and winter (n = 98)) is also considered. A reach scale experimental manipulation of sediment composition in the HZ of a highly dynamic, species rich and diverse study site (limestone) was also undertaken. I found the influence of glaciation on stygobite fauna still apparent in the two limestone areas with macrofaunal sized stygobite species rare or absent in both limestone areas. Meiofaunal sized stygobite fauna Antrobathynella stammeri (Crustacea: Syncarida) were recorded from the glaciated limestone site. These results suggest large stygobite fauna are rare or absent in the limestone areas of Northern England with meiofaunal stygobites possibly surviving in sub-glacial refugia. Stygobite fauna were abundant in southern England with alternative migratory routes north discussed (e.g. River Severn catchment and chalk aquifers). Geological regions had characteristic fauna with species richness and abundance of meio- and macrofauna high in the HZ of both limestone areas. Conversely, species richness and abundance was low in the chalk and sandstone HZ. The chalk HZ had a high abundance of macrofaunal sized Crustacea (Gammarus pulex) and low abundance of meiofaunal sized Crustacea (Copepoda). This suggested mechanical properties (burrowing) rather than morphology (body size and shape) was important in fine sediments, whereas in the limestone HZ morphology rather than mechanical properties was important. In the experimental study results were more intuitive with meiofauna abundant across all sediment treatments (fine, mixed, coarse and natural) with macrofauna abundant in sediment treatments containing a high proportion of coarse material. These results suggest Copepoda assume a greater role in ecological processes in fine sediment patches within a dynamic HZ, whereas when fine sediment dominates a system (e.g. chalk HZ) then the role of Copepoda is reduced. One implication could be the use of Copepoda as indicators of colmation and hydrologic exchange in the assessment of ecosystem health and give an indication of the refugial capacity of the HZ from projected high and low flow events in light of UK climate change forecasts. 2 Contents Abstract ............................................................................................................................. 2 Contents ............................................................................................................................ 3 List of Tables ..................................................................................................................... 7 List of Figures ................................................................................................................... 9 List of Appendices ........................................................................................................... 14 Acknowledgements .......................................................................................................... 15 Chapter I: The influence of climate and hydrogeology on the hyporheos of groundwater dominated streams in the UK ........................................................................................... 16 General introduction ............................................................................................................. 16 Glacial influence on UK Rivers ............................................................................................. 23 Hydrogeology: influence of groundwater-surfacewater interactions on rivers in the UK .... 24 Groundwaters of the UK ............................................................................................................................... 24 Primary aquifers of the UK ........................................................................................................................... 28 Cretaceous Chalk ..................................................................................................................................... 29 Permo-Triassic sandstone ........................................................................................................................ 29 Limestone ................................................................................................................................................. 30 Hydrogeological influences on hyporheic ecology ................................................................. 30 Groundwater-surfacewater interactions ........................................................................................................ 30 Hydraulic conductivity .................................................................................................................................. 31 Nutrients ........................................................................................................................................................ 35 Oxygen .......................................................................................................................................................... 36 Disturbance .................................................................................................................................................... 37 Hyporheic ecology ................................................................................................................. 39 Hyporheic assemblages (hyporheos)...................................................................................... 40 Hypogean fauna ............................................................................................................................................ 41 Epigean fauna ................................................................................................................................................ 44 Hyporheic research in the UK ............................................................................................... 45 Aims and objectives of the thesis ........................................................................................... 47 Chapter II: Methodology ................................................................................................. 49 Introduction ........................................................................................................................... 49 Study sites .............................................................................................................................. 52 Carboniferous limestone ............................................................................................................................... 53 Yorkshire dales– glaciated ............................................................................................................................ 54 Ure catchment .......................................................................................................................................... 55 Wharfe catchment .................................................................................................................................... 56 Carboniferous limestone – unglaciated ........................................................................................................ 58 Dove catchment ........................................................................................................................................ 58 Derwent catchment .................................................................................................................................
Load more

Recommended publications
  • Biological and Landscape Diversity in Slovenia
    MINISTRY OF THE ENVIRONMENT AND SPATIAL PLANNING ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA Biological and Landscape Diversity in Slovenia An overview CBD Ljubljana, 2001 MINISTRY OF THE ENVIRONMENTAL AND SPATIAL PLANNING ENVIRONMENTAL AGENCY OF THE REPUBLIC OF SLOVENIA Published by: Ministry of the Environment and Spatial Planning - Environmental Agency of the Republic of Slovenia Editors in chief and executive editors: Branka Hlad and Peter Skoberne Technical editor: Darja Jeglič Reviewers of the draft text: Kazimir Tarman Ph.D., Andrej Martinčič Ph.D., Fedor Černe Ph.D. English translation: Andreja Naraks Gordana Beltram Ph.D. (chapter on Invasive Species, ......., comments on the figures), Andrej Golob (chapter on Communication, Education and Public Awareness) Revision of the English text: Alan McConnell-Duff Ian Mitchell (chapter on Communication, Education and Public Awareness) Gordana Beltram Ph.D. Designed and printed by: Littera Picta d.o.o. Photographs were contributed by: Milan Orožen Adamič (2), Matjaž Bedjanič (12), Gordana Beltram (3), Andrej Bibič (2), Janez Božič (1), Robert Bolješič (1), Branka Hlad (15), Andrej Hudoklin (10), Hojka Kraigher (1), Valika Kuštor (1), Bojan Marčeta (1), Ciril Mlinar (3), Marko Simić (91), Peter Skoberne (57), Baldomir Svetličič (1), Martin Šolar (1), Dorotea Verša (1) and Jana Vidic (2). Edition: 700 copies CIP - Kataložni zapis o publikaciji Narodna in univerzitetna knjižnica, Ljubljana 502.3(497.4)(082) 574(497.4)(082) BIOLOGICAL and landscape diversity in Slovenia : an overview / (editors in chief Branka Hlad and Peter Skoberne ; English translation Andreja Naraks, Gordana Beltram, Andrej Golob; photographs were contributed by Milan Orožen Adamič... et. al.). - Ljubljana : Ministry of the Environment and Spatial Planning, Environmental Agency of the Republic of Slovenia, 2001 ISBN 961-6324-17-9 I.
    [Show full text]
  • Fell Cottage, Marsett, Nr Lake Semerwater (Lot 3/3)
    Hawes 01969 667744 Bentham 01524 26 2044 Leyburn 01969 622936 Settle 01729 825311 www.jrhopper.com Market Place, Leyburn London 02074 098451 North Yorkshire DL8 5BD [email protected] “For Sales In The Dales” 01969 622936 Fell Cottage, Marsett, Nr Lake Semerwater (lot 3/3) Barn Conversion Low Maintenance Garden Excellent Bolt Hole Or Multi-Fuel Stove Parking For 2 Cars Holiday Let Two Double Bedrooms Rural Location With Viewing Highly Both En-suite Stunning Views Recommended Offers Around £205,000 RESIDENTIAL SALES • LETTINGS • COMMERCIAL • PROPERTY CONSULTANCY Valuations, Surveys, Planning, Commercial & Business Transfers, Acquisitions, Conveyancing, Mortgage & Investment Advice, Inheritance Planning, Property, Antique & Household Auctions, Removals J. R. Hopper & Co. is a trading name for J. R. Hopper & Co. (Property Services) Ltd. Registered: England No. 3438347. Registered Office: Hall House, Woodhall, DL8 3LB. Directors: L. B. Carlisle, E. J. Carlisle Fell Cottage, Marsett, Nr. Lake Semerwater DESCRIPTION Fell Cottage is a delightful barn conversion in the tiny hamlet of Marsett up in Raydale, at the southern end of Lake Semerwater, the largest natural lake in Yorkshire, but quite undiscovered. The property is tucked away down a private track. Marsett itself has 3 working farms in and around the hamlet as well as a seasonal campsite for tents only. The hamlet also benefits from high speed broadband. Raydale is a little Dale of Wensleydale and Marsett and lies only 3.5 miles from the village of Bainbridge and 5.5 miles from the popular market town of Hawes. It enjoys an abundance of wildlife and is great for bird watching, fishing and walkers wishing to set off straight from the cottage doorstep! Hawes is a thriving market town with a good range of shops, restaurants, tea rooms and pubs.
    [Show full text]
  • Stable Cottage, Barn & Campsite, Marsett, Nr Lake Semerwater
    Hawes 01969 667744 Bentham 01524 26 2044 Leyburn 01969 622936 Settle 01729 825311 www.jrhopper.com Market Place, Leyburn London 02074 098451 North Yorkshire DL8 5BD [email protected] “For Sales In The Dales” 01969 622936 Stable Cottage, Barn & Campsite, Marsett, Nr Lake Semerwater (lot 2/3) Dales House, Land & Stables Dining Room Detached Barn/Stables Delightful Barn Conversion Modern Fitted Kitchen Ample Parking Rural Yet Accessible Location Boot Room Double Glazing 3 Double Bedrooms Wet Room & Downstairs WC Patio & Garden Living Room with Bi-Fold Doors Ap prox 5 Acres Of Land used as Fantastic Views & Multi Fuel Stove a Tented Campsite Ideal Family Home Or Business Opportunity Offers Around £500,000 RESIDENTIAL SALES • LETTINGS • COMMERCIAL • PROPERTY CONSULTANCY Valuations, Surveys, Planning, Commercial & Business Transfers, Acquisitions, Conveyancing, Mortgage & Investment Advice, Inheritance Planning, Property, Antique & Household Auctions, Removals J. R. Hopper & Co. is a trading name for J. R. Hopper & Co. (Property Services) Ltd. Registered: England No. 3438347. Registered Office: Hall House, Woodhall, DL8 3LB. Directors: L. B. Carlisle, E. J. Carlisle Stable Cottage, Barn & Campsite, Marsett, Nr Lake Semerwater DESCRIPTION Lot 1 – Stable Cottage, Fell Cottage, Barn and Campsite/land Lot 2 – Stable Cottage, Barn & Campsite/land Lot 3 – Fell Cottage Stable Cottage is a fantastic Small Holding located in the hamlet of Marsett in Raydale which is being offered in 3 lots. Raydale is situated at the southern end of Lake Semerwater, the largest natural lake in Yorkshire, but quite undiscovered. The property itself is down a private track beyond the main village green. Raydale is a little Dale off Wensleydale.
    [Show full text]
  • 9 a New Record of Burrowing Mayfly, Anthopotamus Neglectus Neglectus
    Ohio Biological Survey Notes 10: 9–12, 2021. © Ohio Biological Survey, Inc. A New Record of Burrowing Mayfly, Anthopotamus neglectus neglectus (Traver, 1935) (Ephemeroptera: Potamanthidae), from Ohio, USA DONALD H. DEAN1 1Departments of Entomology and Chemistry & Biochemistry, 484 W. 12th Ave., The Ohio State University, Columbus, OH USA 43214. E-mail: [email protected] Abstract: A new state record for a mayfly (Ephemeroptera) was collected on the Olentangy River, Delaware County, Ohio, USA. Anthopotamus neglectus Traver (1935) were collected as nymphs and subsequently reared to adults. Keywords: Olentangy River, Delaware County, Ohio Introduction The neglected hackle-gilled burrowing mayfly, or the golden (or yellow) drake to fly fishers, Anthopotamus neglectus was first described by Traver (1935) as Potomanthus neglectus. Bae and McCafferty (1991) reorganized the family Potomanthidae and placed the taxon in a new genus, Anthopotamus McCafferty and Bae (1990). They further divided the species into two subspecies, A. neglectus neglectus and A. neglectus disjunctus. The geographic range of the former species was originally given as a small circle centered in New York. The latter species was centered in the south-central United States. More recently, A. neglectus neglectus has been reported in eastern North America including Ontario, Alabama, Arkansas, Maryland, Missouri, Mississippi, New York, Oklahoma, Tennessee, Virginia, and West Virginia (Randolph, 2002). The online database NatureServe Explorer (2019) lists the range of A. neglectus neglectus as previously stated, with the addition of Georgia and Pennsylvania (but it includes the caveat “Distribution data for U.S. states and Canadian provinces is known to be incomplete or has not been reviewed for this taxon”).
    [Show full text]
  • Part 1 Rea Ch Classifica Tion
    RIVER QUALITY SURVEY NATIONAL RIVERS AUTHORITY NORTHUMBRIA & YORKSHIRE REGION GQA ASSESSMENT 1994 PART 1 REA CH CLASSIFICA TION FRESHWATER RIVERS AND CANALS VERSION 1: AUGUST 1995 GQA ASSESSMENT 1994 \ NORTHUMBRIA & YORKSHIRE REGION To allow the development of a National method of evaluating water quality, the rivers in all the NRA regions of England and Wales have been divided into reaches, which are numbered using a coding system based on the hydrological reference for each river basin. Each classified reach then has a chemistry sample point assigned to it and these sample points are regularly monitored for Biochemical Oxygen Demand (BOD), Dissolved oxygen (DO) and Total Ammonia. The summary statistics calculated from the results of this sampling are sent to a National Centre where the GQA Grades are calculated. A National report is produced and each region can then produce more detailed reports on the quality of their own rivers. For Northumbria and Yorkshire Region, this Regional Report has been divided into two parts. PARTI: REACH CLASSIFICATION This report contains a listing of the river reaches within the region, with their start and finish grid reference, approximate length, and the 1990 and 1994 GQA class for each reach. The reference code of the chemistry sample point used to classify the reach is also included. A sample point may classify several reaches if there are no major discharges or tributaries dividing those reaches. The sample point used to classify a reach may change and the classification is therefore calculated using the summary statistics for each sample point that has been used over the past three years.
    [Show full text]
  • The Role of Predation in the Diet of Niphargus (Amphipoda: Niphargidae)
    Fišer et al. The role of predation in the diet of Niphargus (Amphipoda: Niphargidae) Cene Fišer, Žana Kovačec, Mateja Pustovrh, and Peter Trontelj Oddelek za biologijo, Biotehniška fakulteta, Univerza v Ljubljani, Večna pot 111, Ljubljana, Slovenia. Emails: [email protected], [email protected], [email protected]; [email protected] Key Words: Niphargus balcanicus, Niphargus timavi, Dinaric Karst, Vjetrenica, feeding, foraging. Niphargus (Amphipoda: Niphargidae) is the largest genus of freshwater amphipods1, with over 300 described species. Recently, it was identified as important for addressing ecological and evolutionary questions2. Nevertheless, the exploration of these issues critically depends on understanding the biology of individual species, which is mostly unknown. For instance, utilization of food sources has rarely been studied. Laboratory observations3,4 acknowledged a broad spectrum of foraging behaviors in N. virei Chevreux 1896 and N. fontanus Bate 1859, ranging from limnivory, detritivory, predation on oligochaetes and arthropods, feeding on decayed leaves and carrion, and fish flakes. Sket5 briefly mentioned how N. krameri Schellenberg 1935 fed on dead conspecifics. Finally, Mathieu et al. speculated that adult N. rhenorhodanesis Schellenberg 1937 could prey upon their own conspecifics6. Here we report on dietary data of two species from the Dinarc Karst. In 2001, we held several individuals of the troglobiotic Niphargus balcanicus Absolon 1927 in an aquarium. Unlike many other amphipods, this large (about 30 mm) species retains an upright position during activity (swimming, walking on ground) and rest. The animals were kept in the speleological laboratory in permanent darkness at 8 ºC. After a few days, we dropped a live isopod Asellus aquaticus (about 10 mm long) into the tank.
    [Show full text]
  • Issue 258 June 2019
    THE UPPER WENSLEYDALE NEWSLETTER Issue 258 June 2019 Stacey Moore Donation please 50p suggested Covering Upper Wensleydale from Wensley to Garsdale Head plus Walden and Bishopdale, Covering UpperSwaledale Wensleydale from from Keld Wensley to Gunnerside to Garsdale plus Cowgill Head, within Upper Walden Dentdale. and Bishopdale, Swaledale from Keld to Gunnerside plus Cowgill in Upper Dentdale. Guest Editorial why would anyone put up with the less attractive features of the life? When Alan Watkinson first asked me to write an occasional guest editorial he told me to avoid Similarly it has always seemed odd and unfair religion and politics. That was and, I think, to criticise politicians for wanting to win remains the Newsletter’s sensible policy. I hope elections. I have come across politicians who that no-one will think that I am breaching that may just have tossed a coin to decide which policy by writing about politicians. party to join but generally they are in the party that comes closest to representing their values Politicians in general come in for a lot of and convictions. In practice on most issues for stick. Unsurprisingly many of us are critical of most of the time, it therefore follows naturally politicians who don’t share our own views. that securing a majority for their party at the Often our fiercest criticism is reserved for next election is for them the same as serving the politicians on our own side who disappoint us or national interest. Just occasionally there are with whom we disagree about a specific detail. moments when it seems right to a responsible The successful expose of the abuse of politician that the national interest and the expenses by MPs didn’t help.
    [Show full text]
  • 21. Yorkshire Dales Area Profile: Supporting Documents
    National Character 21. Yorkshire Dales Area profile: Supporting documents www.gov.uk/natural-england 1 National Character 21. Yorkshire Dales Area profile: Supporting documents Introduction National Character Areas map As part of Natural England’s responsibilities as set out in the Natural Environment 1 2 3 White Paper , Biodiversity 2020 and the European Landscape Convention , we North are revising profiles for England’s 159 National Character Areas (NCAs). These are East areas that share similar landscape characteristics, and which follow natural lines in the landscape rather than administrative boundaries, making them a good Yorkshire decision-making framework for the natural environment. & The North Humber NCA profiles are guidance documents which can help communities to inform their West decision-making about the places that they live in and care for. The information they contain will support the planning of conservation initiatives at a landscape East scale, inform the delivery of Nature Improvement Areas and encourage broader Midlands partnership working through Local Nature Partnerships. The profiles will also help West Midlands to inform choices about how land is managed and can change. East of England Each profile includes a description of the natural and cultural features that shape our landscapes, how the landscape has changed over time, the current key London drivers for ongoing change, and a broad analysis of each area’s characteristics and ecosystem services. Statements of Environmental Opportunity (SEOs) are South East suggested, which draw on this integrated information. The SEOs offer guidance South West on the critical issues, which could help to achieve sustainable growth and a more secure environmental future.
    [Show full text]
  • The Ecology of Cowside Beck, a Tributary of the River Skirfare in the Malham Area of Yorkshire
    The ecology of Cowside Beck, a tributary of the River Skirfare in the Malham area of Yorkshire Oliver Gilbert, Helen Goldie, David Hodgson, Margaret Marker, Allan Pentecost, Michael Proctor and Douglas Richardson Dedicated to the memory of Oliver Lathe Gilbert 7th September 1936 - 15th May 2005 Published by Field Studies Council, Malham Tarn Field Centre, Settle, North Yorkshire BD24 9PU. Tel: 01729-830331 E-mail: [email protected] www.field-studies-council.org Copies of this report may be purchased from the Field Centre. This report can also be consulted on the website above. Contributors The late Oliver L. Gilbert (formerly Department of Landscape, University of Sheffield) Helen Goldie (Department of Geography, University of Durham) 2 Springwell Road, Durham DH1 4LR David Hodgson (The Craven Pothole Club) 9 Craven Terrace, Settle, North Yorkshire BD24 9DF Margaret Marker (formerly School of Geography and Environmental Science, Oxford University) 5 Wytham Close, Eynsham, Oxon OX29 4NS Adrian Norris (formerly The Leeds Museum Resource Centre) 17 West Park Drive, Leeds LSl6 5BL Allan Pentecost School of Health and Life Sciences, Kings College, University of London, 150 Stamford Street, London SE1 9NH Michael C. F. Proctor School of Biosciences, University of Exeter, Hatherly Laboratories, Prince of Wales Road, Exeter EX4 4PS Douglas T. Richardson (formerly Department of Earth Sciences, University of Leeds) 5 Calton Terrace, Skipton, North Yorkshire BD23 2AY If you would like to be involved in this work please contact: Cowside Beck
    [Show full text]
  • Microsoft Outlook
    Joey Steil From: Leslie Jordan <[email protected]> Sent: Tuesday, September 25, 2018 1:13 PM To: Angela Ruberto Subject: Potential Environmental Beneficial Users of Surface Water in Your GSA Attachments: Paso Basin - County of San Luis Obispo Groundwater Sustainabilit_detail.xls; Field_Descriptions.xlsx; Freshwater_Species_Data_Sources.xls; FW_Paper_PLOSONE.pdf; FW_Paper_PLOSONE_S1.pdf; FW_Paper_PLOSONE_S2.pdf; FW_Paper_PLOSONE_S3.pdf; FW_Paper_PLOSONE_S4.pdf CALIFORNIA WATER | GROUNDWATER To: GSAs We write to provide a starting point for addressing environmental beneficial users of surface water, as required under the Sustainable Groundwater Management Act (SGMA). SGMA seeks to achieve sustainability, which is defined as the absence of several undesirable results, including “depletions of interconnected surface water that have significant and unreasonable adverse impacts on beneficial users of surface water” (Water Code §10721). The Nature Conservancy (TNC) is a science-based, nonprofit organization with a mission to conserve the lands and waters on which all life depends. Like humans, plants and animals often rely on groundwater for survival, which is why TNC helped develop, and is now helping to implement, SGMA. Earlier this year, we launched the Groundwater Resource Hub, which is an online resource intended to help make it easier and cheaper to address environmental requirements under SGMA. As a first step in addressing when depletions might have an adverse impact, The Nature Conservancy recommends identifying the beneficial users of surface water, which include environmental users. This is a critical step, as it is impossible to define “significant and unreasonable adverse impacts” without knowing what is being impacted. To make this easy, we are providing this letter and the accompanying documents as the best available science on the freshwater species within the boundary of your groundwater sustainability agency (GSA).
    [Show full text]
  • Filter-Feeding Habits of the Larvae of Anthopotamus \(Ephemeroptera
    Annls Limnol. 28 (1) 1992 : 27-34 Filter-feeding habits of the larvae of Anthopotamus (Ephemeroptera : Potamanthidae) W.P. McCaffertyl Y.J. Bae1 Keywords : Ephemeroptera, Potamanthidae, Anthopotamus, filter feeding, behavior, morphology, detritus. A field and laboratory investigation of the food and feeding behavior of larvae of the potamanthid mayfly Anthopo­ tamus verticis (Say) was conducted from 1989 to 1991 on a population from the Tippecanoe River, Indiana (USA). Gut content analyses indicated that all size classes of larvae are detritivores, with over 95 % of food consisting of fine detrital particles. Videomacroscopy indicated that all size classes of larvae are filter feeders, able to utilize both active deposit filter feeding and passive seston filter feeding cycles in their interstitial microhabitat. Deposit filter feeding initially incor­ porates the removal of loosely deposited detritus with the forelegs. Seston filter feeding initially incorporates filtering by long setae on the forelegs and palps. Mandibular tusks are used to help remove detritus from the foreleg setae. A SEM examination of filtering setae indicated they are hairlike and bipectinate, being equipped with lateral rows of setu- les. The results show that previous assumptions that potamanthid larvae were collector/gatherers are erroneous. The results are applicable to congeners, and all potamanthids, including Palearctic and Oriental elements, are hypothesized to be filter feeders, differing only in some details of behavior. Le régime trophique de type filtreur des larves d'Anthopotamus (Ephemeroptera : Potamanthidae) Mots clés : Ephemeroptera, Potamanthidae, Anthopotamus, type trophique filtreur, comportement, morphologie, débris particulates. Une investigation sur le régime alimentaire et le comportement trophique des larves de l'Ephémère Potamanthidae Anthopotamus verticis (Say) a été menée à la fois sur le terrain et expérimentalement au laboratoire de 1989 à 1991, sur une population de la rivière Tippecanoe, Indiana (USA).
    [Show full text]
  • Donation Please: 30P Suggested Or More If You Wish
    THE UPPER WENSLEYDALE NEWSLETTER Issue 246 May 2018 Donation please: 30p suggested or more if you wish Bolton Castle Covering Upper Wensleydale from Wensley to Garsdale Head plus Walden and Bishopdale, Covering UpperSwaledale Wensleydale from from Keld Wensley to Gunnerside to Garsdale plus Cowgill Head, within Upper Walden Dentdale. and Bishopdale, Swaledale from Keld to Gunnerside plus Cowgill in Upper Dentdale. Guest Editorial These are the people who, like me, didn’t have it easy in our childhood or our working lives. Bashing the baby boomers has become a Holidays were Filey, or Falmouth if you were popular sport. From David Willetts, former Tory really adventurous. As children we were not the government minister, and his endearingly titled be-all and end-all of our parents’ lives. We had book “The Pinch: How the baby boomers took to be disciplined and constrained: if we were their children’s future - and why they should bad it was our fault and if we were good it was give it back” to American Bruce Gibney’s “A because we’d had the badness knocked out of Generation of Sociopaths: How the baby us. Then, by the time we had children of our boomers betrayed America” you, or rather we own, the tables had turned: only bad parents who are those very boomers, born in the make bad children became the received wisdom, - immediate post war period, get the message. while John Bowlby’s “Childcare and the We are selfish, greedy, pension-pampered Growth of Love” (still etched on my brain) thieves who stole all the best houses and now warned of the dangers of “maternal live lives of unequalled comfort and privilege, deprivation.” with a sense of entitlement and no care for our But even if we’d dared to leave our children communities or even our own children and and go to work, there was neither maternity grandchildren who are forced to pay the price of leave nor nursery provision, so little hope of a - our gross self indulgence.
    [Show full text]