Thursday, December 9, 2010

ENSO across eastern tropical Pacific

Weekly averaged sea surface temperatures (top, °C) and anomalies (bottom, °C) for the past twelve weeks. SST analysis is the optimum interpolation (OI) analysis, while anomalies are departures from the adjusted OI climatology (Reynolds and Smith 1995, J. Climate, 8, 1571-1583).

Lo último sobre el ENOS
Fuente: NOAA (

Monday, December 6, 2010


March 16-20, 2011
Renaissance Riverview Plaza and Battle House Hotel

Key dates: Early Registration Deadline, February 1, 2011
Hotel Reservation by February 12, 2011.
Abstract Submission Deadline, January 21, 2011.


The 2nd "Beneath the Waves Film Festival" will be held at the Benthic Ecology Meeting, For more information please visit
Organizers:  Sean Powers, John Valentine and Kenneth Heck
Dauphin Island Sea Lab and the University of South Alabama


The 2011 Benthic Ecology Meeting will accept abstracts for oral presentations on the following topics:

Chemical Ecology
Physical Processes
Physiological and Molecular Ecology
Introduced species
Life History Strategies
Recruitment/Larval Ecology
Trophic Relationships
Community Ecology
Ecosystem Functioning
Parasite-Host Relationships
Anthropogenic Impacts
Oil Spill Impacts

The deadline to submit abstracts for oral and poster presentations at the 2011 BEM will be January 21, 2011 at 5:00 PM CST.

Abstract Guidelines
Please follow these instructions carefully.  Abstracts must be in English, use metric units, and italics for scientific name.  Do not include illustrations, figures, or photos.

Oral presentations will be 15 minutes (approximately 12 minutes with 3 minutes for questions) and strictly adhered to.  Microsoft Powerpoint (version 2007) will be used and it is suggested that all videos be in the format of .avi, .mpg, or wmv.  Note that all presentations will be given on supplied windows xp laptops.  Personal laptops will not be allowed for presenting presentations. Presentations should be uploaded at registration or during breaks on the day before your scheduled presentation time. A practice room will be available.

Please Click Here to submit your abstract
For information on submitting a film, please visit or contact Austin Gallagher.
DISL                   USA

Mais informações no site oficial

Thursday, November 25, 2010

3er Congresso Brasileiro de Biologia Marinha / Maio 2011

Centro de Convenções
do Hotel Praiamar

Natal - RN       
Fone/fax: (21) 2629-2307    

More information HERE

Monday, November 22, 2010

2nd International Congress on Invertebrate Morphology, June 20-23, 2011

Welcome to the 2nd International Congress on Invertebrate Morphology (ICIM), the venue that interconnects researchers from the International Society for Invertebrate Morphology and other societies interested in the morphology and evolution of invertebrate animals. The 2nd ICIM will be hosted by the Museum of Comparative Zoology, the Department of Organismic and Evolutionary Biology, and the Harvard Museum of Natural History, at Harvard University, from June 20th to June 23rd 2011.
 More information HERE

Wednesday, October 27, 2010

Cirratulidae & Spionidae Identification Workshop 26th to 28th November 2010 in Bath

This course will enable participants to gain experience and develop confidence in the identification of species of Spionidae and Cirratulidae, two common families of marine annelids. The course will include an introductory talk on each of the groups covering body parts, terminology and use of the important dichotomous keys for each group. The main focus of the weekend will be microscope work, allowing students to work through specimens from the two families at their own speed. Participants will carry out identification using industry standard keys and papers with the assistance of two professional marine biologists who between them have over fifteen years experience of processing benthic samples. Specimens from the majority of British genera will be available. Time will be allocated at the end of the course for participants to look at their own specimens with assistance from the course leaders.
Course fees include membership to the Marine Biological Association of the UK.  Existing members of the Marine Biological Association are entitled to a 10% discount on the rate.

Download 26th to 28th November 2010 booking form here

Introduction to Benthic Taxonomy
A two week course to be held at the Marine Biological Association in Plymouth. This course is aimed at undergraduates and recent graduates wishing to develop their benthic identification skills. The course will ;

    * introduce students to  the concepts and uses of benthic taxonomy
    * provide experience of both intertidal and subtidal sample collection, preservation and analysis
    * provide training in the use and construction of dichotomous keys (including online resources)
    * develop taxonomic understanding and exposure

 Specialist Taxonomy Short Courses
Short courses concentrating on particular phyla, families or interest groups. These courses are aimed at graduates and practising taxonomists wishing to enhance their knowledge of marine taxonomy.  Demonstrable experience in marine taxonomy or completion of the Introduction to Marine Taxonomy is a prerequisite to these courses. You will only be awarded a place on a particular course if we are happy that you have the required  prior knowledge.

Download this document for further details

More information:

Tuesday, October 19, 2010

Friday Harbor Laboratories SUMMER 2011 COURSEWORK

Applications for Summer 2011 courses will be accepted starting in October, 2010 until the following deadline:
*Applications will be accepted past the deadline if space available. For information please contact Stacy Markman, FHL Student Coordinator.

FHL SUMMER A TERM: June 20-July 22 (5 weeks)
Students arrive Sunday, June 19 after 3:00 p.m., depart Friday, July 22 after lunch.

FHL SUMMER B TERM: July 25-August 26 (5 weeks)
Students arrive Sunday, July 24 after 3:00 p.m., depart Friday, August 26 after lunch.

Summer classes held Monday-Saturday:
Mon-Fri 8 am-5 pm, plus Sat morning 8 am-noon, except final week no Saturday meeting.
The 5-week courses in summer are intended primarily for graduate students, with the exception of Marine Invertebrate Zoology. Courses may be taken sequentially, i.e., one in each summer session, but not concurrently. Well-qualified undergraduates may be admitted to graduate level courses with the consent of the FHL Director and the faculty involved.
In Summer 2011 FHL is offering one undergraduate-level course and five graduate-level courses. Each course is 9 credits.

More details and further information on web site

Friday, September 3, 2010

Vacancy: Senior Marine Macrobenthic Taxonomist

(From Annelida group)
Dear Colleagues,

We have the following vacancy at Marine Ecological Surveys Ltd (MESL).

Deadline for applications has already expired, but we would be happy to consider further applications until the 15th of September 2010.

Kind regards,
Sara Marzialetti

Vacancy: Senior Marine Macrobenthic Taxonomist
The MESL laboratory specialises in analysis of benthic and epibenthic samples from a wide variety of environments ranging from estuarine to offshore.  Primarily our work consists of monitoring for the aggregate industry and, more recently, the renewable energy sector.  Our staff comprise of an experienced team of marine biologists who are self-motivated and work to tight deadlines.
We are looking for a senior marine macrobenthic taxonomist whose primary role will be to undertake analysis of benthic samples and identification of all taxonomic groups, together with training of junior staff in benthic taxonomy.  You will be educated to at least degree level in marine biology or a related discipline and also have at least two years experience in marine invertebrate analysis and taxonomic identification.  While you will be mostly lab-based, you will also be required to participate in fieldwork.  
MESL participates in the NMBAQC scheme, and in conjunction with this, we run our own internal training scheme to develop the taxonomic skills of our laboratory staff.  We also encourage continued professional development for all our staff.
Please email your CV to
Sara Marzialetti PhD
Senior Marine Ecologist

Marine Ecological Surveys Limited
3 Palace Yard Mews

Tel: 01225 442211
Fax: 01225 444411


Tuesday, August 24, 2010

I Simposio de Biodiversidad Marina y Costera de Latinoamerica y El Caribe

                          Del 9 al 12 de diciembre del 2010
                                             Manta – EcuadorManta – Ecuador

More information HERE

Monday, August 23, 2010

More Publications

The ISME Journal advance online publication 15 July 2010; doi: 10.1038/ismej.2010.106

Big sulfur bacteria

Bo Barker Jørgensen1
1Department of Biological Sciences, Center for Geomicrobiology, Aarhus University, Aarhus, Denmark
Correspondence: BB Jørgensen, E-mail:

Donwload here

The ISME Journal , (5 August 2010) doi:10.1038/ismej.2010.121

Identity of epibiotic bacteria on symbiontid euglenozoans in O2-depleted marine sediments: evidence for symbiont and host co-evolution

V P Edgcomb, S A Breglia, N Yubuki, D Beaudoin, D J Patterson, B S Leander and J M Bernhard

A distinct subgroup of euglenozoans, referred to as the ‘Symbiontida,’ has been described from oxygen-depleted and sulfidic marine environments. By definition, all members of this group carry epibionts that are intimately associated with underlying mitochondrion-derived organelles beneath the surface of the hosts. We have used molecular phylogenetic and ultrastructural evidence to identify the rod-shaped epibionts of the two members of this group, Calkinsia aureus and B.bacati, hand-picked from the sediments of two separate oxygen-depleted, sulfidic environments. We identify their epibionts as closely related sulfur or sulfide-oxidizing members of the epsilon proteobacteria. The epsilon proteobacteria generally have a significant role in deep-sea habitats as primary colonizers, primary producers and/or in symbiotic associations. The epibionts likely fulfill a role in detoxifying the immediate surrounding environment for these two different hosts. The nearly identical rod-shaped epibionts on these two symbiontid hosts provides evidence for a co-evolutionary history between these two sets of partners. This hypothesis is supported by congruent tree topologies inferred from 18S and 16S rDNA from the hosts and bacterial epibionts, respectively. The eukaryotic hosts likely serve as a motile substrate that delivers the epibionts to the ideal locations with respect to the oxic/anoxic interface, whereby their growth rates can be maximized, perhaps also allowing the host to cultivate a food source. Because symbiontid isolates and additional small subunit rDNA gene sequences from this clade have now been recovered from many locations worldwide, the Symbiontida are likely more widespread and diverse than presently known.

Recent Publications On Meiofauna

The ISME Journal , (13 May 2010)

Meiofauna reduces bacterial mineralization of naphthalene in marine sediment

Johan Näslund, Francisco JA Nascimento and Jonas S Gunnarsson

The role of sediment-living meiofauna, benthic invertebrates smaller than 1000 μm such as nematodes and ostracods, on the mineralization of naphthalene, a common polycyclic aromatic hydrocarbon (PAH) in marine sediments, was studied in microcosms using radiorespirometry. A method to extract live meiofauna was developed and used in order to experimentally manipulate meiofauna abundance and group diversity. Higher abundances of meiofauna were found to significantly decrease naphthalene mineralization. Furthermore, a change in the bacterial community composition (studied using terminal restriction fragment length polymorphism) was also observed in presence of higher meiofauna abundance, as well as a lower number of cultivable naphthalene-degrading bacteria. The reduced mineralization of naphthalene and the altered bacterial community composition in the presence of increased meiofauna abundance is likely the result of top-down control by meiofauna. This study shows that higher abundances of meiofauna can significantly decrease the microbial mineralization of PAHs such as naphthalene and also significantly modify the bacterial community composition in natural marine sediments.

Thursday, July 15, 2010

ICES Marine Conference

ICES Annual Science Conference 2010 will be held at la Cité des Congrès in Nantes, France, between 20 and 24 September.

ICES Annual Science Conference provides a forum in which an international community of marine scientists, professionals, and students gather to share their work in theme-based series of oral and poster presentations. Each year, the Conference is hosted by one of our 20 Member Countries, and has a unique website to handle electronic submissions and registration.

Visit the website in the coming months as further details are made available.

Organised by ICES
Hosted by IFREMER


Plenary Lectures

Open Lecture

Jane Lubchenco, The Honorable Dr. Jane Lubchenco, Under Secretary of Commerce for Oceans and Atmosphere & NOAA Administrator, USA
Managing marine biodiversity: an emerging consensus

Invited Plenary Lectures

Myriam Sibuet, Vice –Chair CoML International Scientific Steering Committee, France

Impact of “Census of Marine Life” on development of marine sciences

Philippe Cury, IRD senior Scientist

Director of the UMR-EME 212 (Exploited Marine Ecosystems)-IRD/Ifremer and University Montpellier 2 Director of CRH (Centre de Recherches Méditerranéenne et Tropicale) Scientific Director of the Eur-Oceans Consortium
Building scenarios for marine ecosystems under anthropogenic and natural forcing in the XXI Century: are we getting ready?

Peter Herman, Professor, Dr, Head of Department 'Spatial Ecology', Netherlands Institute of Ecology

From conflicts to solutions. The role of science in Dutch coastal planning issues


Neobiota, Trilateral Conference, Wadden Sea

Trilateral Conference on
Neobiota in the Wadden Sea -Challenges for Nature Conservation
26 August 2010

Das Wattemeerhaus

The 5th Wadden Sea Day on 26 August 2010 has the theme "Neobiota in the Wadden Sea" and is organized by the National Park Administration Wadden Sea Lower Saxony together with the Common Wadden Sea Secretariat.

Background and Objective
For centuries, alien species have been introduced to new areas in which they were previously absent and to which they have been introduced by humans as mediator. With increasing global trade the introduction, both intentional and unintentional, has increased concomitantly and has increased in complexity. Next to global habitat loss and climate change, this biological globalization has become a key process in altering the biosphere.

The Quality Status Report for the Wadden Sea 2009 has shown that in the Wadden Sea, a diverse range of alien species has established permanent populations. The rate of alien species is continuously increasing. Many of the species have become abundant and several can be regarded as invasive in the sense of having a significant effect on the recipient ecosystem.
Furthermore, with inscription of the Wadden Sea on the World Heritage List in June 2009, the World Heritage Committee encourage the State Parties to implement a strict monitoring program to control invasive species associated with ballast water, marinas and aquaculture in the property.
The conference has the aim to provide insights in recent research and management projects along the Wadden Sea coast, to assess the possible threat to the World Heritage and to discuss with scientists and managers how new challenges by marine alien species can be met by trilateral policy and management.

The Program
The sessions of the workshop will focus on Status of marine neobiota in the Wadden Sea
Monitoring and assessment of aliens (“rapid assessment” project, beach explorer, TMAP)
Management (eradication, control) and prevention of introduction (shipping, aquaculture, marinas) and communication (awareness, qualification of guides)

preliminary program
travel information

Who shall attend?
Invited are policy makers, conservation managers, scientists, and non-governmental organizations. The number of participants is limited to 80 persons.

Further information and registration
Please confirm your attendance until 15 August 2010

By mail, email or fax to:

Dr. Gerald Millat
National Park Lower Saxon Wadden Sea,
Virchowstr. 1,
26382 Wilhelmshaven
Tel. +49 4421-911-298, Fax +49 04421-911-280,

Friday, July 9, 2010


Saturday 27 November 2010
The programme for 27 November 2010 is yet to be decided. If you would like a particular subject dealt with, please contact Judith.
The annual workshop held in Woking offers members the opportunity to receive tuition in identification. In the past there has been a tendency to concentrate on the so-called "difficult groups", but if you are a beginner do not be put off by that. Beginners are always welcome, especially if they give prior notice so that arrangements may be made for the use of a stereo microscope if they do not have one of their own.
Bookings to Judith Nelson (01483 761210) (home). A fee of £5 will be charged to cover expenses. PLEASE BOOK EARLY.
This meeting  is being held by kind invitation of Judith Nelson at Hilbre House, Pembroke Road, Woking, Surrey GU22 7ED (01483 761210) from 10:00 h prompt until approximately 17:00 h.

Please note Hilbre is a no-smoking property.
Those attending should please bring a microscope and lamps (a few microscopes are available if booked in advance), Petri dishes or other dishes for sorting purposes, a fine water colour paint brush (00), tweezers/forceps, dissecting tools, if possible an extension lead and/or double electric plug, books to help identification, and a packed lunch. Coffee, tea and biscuits are provided.
As numbers for the workshop are limited, please confirm any booking made by 1 November so that it can be checked whether there are any places vacant. Those NOT confirming by 1 November will be taken as not wishing to attend and their place will go to someone else. No reminders will be given.

Further information HERE

Wednesday, July 7, 2010

Modern Taxonomy Course Programme 2010-2011

Further information here

Aquatic Invasive Species (Short Course)

Course Overview

This course will allow you to develop an applied understanding of the ecology and management of aquatic invasive species through a series of lectures and a field visit. Concentrating primarily on freshwater environments, you will be able to demonstrate a critical understanding of survey techniques relevant to invasive species ecology, monitoring and research. Material covered will be highly appropriate for underpinning management strategies and protocols.

How to apply

  1. Complete the application form (MS Word document)
  2. Save the completed form to your computer
  3. Log-in to your email account and open new message
  4. Attach the application form
  5. Send email to

Contact us ...

If you have any questions or would just like to register your interest in the course:
  • Give us a call (Monday - Friday 8am - 8pm) on 08456 501 501* or (0)1202 961916 (UK and International/EU alternative number) 
  • Drop us an email:
* BU does not profit from this number
Duration: 6-9 September 2010


Next Meeting on 2011 - Congress on Malacology

The Congress will be held on the Campus of Álava of the University of the Basque Country and in the 'Palacio de Congresos Europa'.

Updated information will be available at the Congress website


Oceans Past III: Stories from the sea - history of marine animal populations and their exploitation


The first decade of international, multi-disciplinary “History of Marine Animal Populations” (HMAP) research program culminates in 2010. At this juncture, it is appropriate to reflect on the project’s major achievements, to look ahead and consider the future of marine environmental history and historical ecology, and to consider how the knowledge assembled to date can be applied to marine resource management and conservation.

Questions regarding the program schould be directed to Project Coordinator Anne Husum Marboe:

Questions concerning local issues should be send to Trinity Long Room Hub, Eva Muhlhause:


Download registration form here: Word or pdf
E-mail, Fax or mail the registrationform to:
Fax: 00353 (1) 896 4220
Mail: Ocean's Past III, Trinity Long Room Hub, Trinity College Dublin, Dublin 2, Ireland.

California and the World Ocean 2010

The co-chairs of the international California and the World Ocean Conference 2010 (CWO ’10), Secretary for Natural Resources Lester Snow, State Controller John Chiang, and Secretary for Environmental Protection Linda Adams invite you to participate in CWO ‘10. This conference, organized by the California Ocean Protection Council, the California Natural Resources Agency, and the California Environmental Protection Agency, will be held September 7-10, 2010 at the Hyatt Regency, San Francisco, California, U.S.A.

As with the previous CWO conferences, CWO ‘10 will seek the experience, views and innovative ideas of experts throughout California, the United States, and the international community in addressing ocean and coastal resource management issues facing California and other states and nations. In addition, the conference will provide an opportunity to bring together representatives from government, academia, industry, and the public to share ideas and formulate action strategies for the 21st century. CWO ’10 will take place as President Obama begins the implementation of a new national ocean policy and national framework for marine spatial planning. This is an exciting time for ocean and coastal policy in this nation and throughout the world, and participants should use this conference as an opportunity to help stimulate creative approaches to address the ecological, environmental and economic challenges that we face.

Presentations at CWO ’10 will address all ocean and coastal subjects that can be applied to resource management and policy. Emerging topics such as climate change impacts, marine spatial planning, marine protected areas, regional ocean governance, and renewable offshore energy will be featured, among other important topics. Presentations will focus on actions that can be taken at the local, state, regional, national, and international levels.

We hope to use this conference to help build on work accomplished through Governor Schwarzenegger’s Ocean Action Plan and help inform our efforts to update the strategic plan for the California Ocean Protection Council. Similarly, we believe CWO ‘10 will help inform our actions with Oregon and Washington in the West Coast Governors’ Agreement on Ocean Health and nationally with President Obama’s new national ocean policy. This information exchanged at CWO ‘10 should be useful to participants from California, other states, and other nations.

CWO ’10 promises to be an enlightening and engaging opportunity for all. We look forward to your participation and hope to see you there.

Lester Snow
Secretary for Natural Resources
John Chiang
State Controller
Linda Adams
Secretary for Environmental Protection

Further information HERE

International Conference on Invertebrate Reproduction and Development in the Age of Genetic Modifications (New information)


1.Genomes, genes, and worms (J.L. Ram)

2.The impacts of climate change and pollution on reproductive processes in marine invertebrates (C.N. Lewis)

3.Biochemistry and molecular biology of molting in crustacaea and insects (H. Laufer)

4.Daphnia and other cladocerans as model organisms (J. Seďa, A. Petrusek)

5.Dormancy and developmental arrests in invertebrates (V. Košťál)

6.Impact of genetically modified crops on arthropod development and reproduction (A. Gatehouse)

7.Miscellaneous reports on invertebrate reproduction and development
Preliminary time schedule - lectures
Preliminary list - posters
More information here

Friday, July 2, 2010

Exhibition Foraminifera of Northern Germany

(Information from:

Saturday, 7th of August 2010 at 14.00h

Ice Age Museum Lütjenburg/Germany

Foraminifera objects
by artist Anna Mandel

Contact me, if you want to organize an exhibition where you are. Michael:

Más información aquí


Discoveries of the Census of Marine Life
Paul V. R. Snelgrove
Cambridge University Press, 2010.

Citizens of the Sea
Nancy Knowlton
National Geographic Society, 2010.

Life in the World's Oceans
Alasdair D. McIntyre, editor
Blackwell Publishing, 2010.

Schatzkammer Ozean
Darlene Trew Crist, Gail Scowcroft, James M. Harding, Jr.
Spektrum Publishing, 2010.


Thursday, July 1, 2010

XI Congresso Brasileiro de Ecotoxicologia (Brazilian Congress on Ecotoxicology)

A Sociedade Brasileira de Ecotoxicologia (ECOTOX-BRASIL) anuncia a décima primeira edição do Congresso Brasileiro de Ecotoxicologia – XI ECOTOX, que será realizada entre os dias 19 a 23 de setembro de 2010 na cidade de Bombinhas - SC. A sede do XI ECOTOX será na Pousada Vila do Farol.

Visite o site do evento para obter mais informações.


XIV International Symposium on Amphipoda (New Information)

The proceedings of the Colloquium will be published in a special volume of the international journal Zoologica Baetica ( Authors interested in publishing their work in this journal are urged to carefully read the Instructions for authors and send their manuscrips before 13th September 2010 (by e-mail to No manuscript will be accepted after this date. If manuscripts do not follow the guidelines of the journal, they will be returned to the author for revision to conform to the style. Papers will be review by two referees (mainly members of the scientific committee) before final publication. The volumen is expected to be published by the beggining of 2011.

Más información AQUÍ

Wednesday, June 23, 2010

49th Annual Meeting. Society of Nematologists. Boise, Idaho


Abstract Submission Deadline has passed.


  • Time for oral presentations = 12 minutes, plus 3 minutes for discussion.

  • Posters must be 46 inches (height) x 36 inches (width) 
    More information here

Friday, June 18, 2010

Workshop on meiofauna from chemosynthetic deep-sea environments

The Census of Marine Life project ChEss (Biogeography of Deep-Water Chemosynthetic Ecosystems) is organizing a workshop on ‘Meiofauna from chemosynthetic deep-sea environments’ in conjunction with the 14th International Meiofauna Conference at Ghent University July, 17 2010. This workshop is organized by Monika Bright and Ann Vanreusel and we would like to invite you to attend for free.
The aim of this workshop is to bring together meiofauna researchers who are interested in any biological aspect concerning deep- sea reducing environments, such as hydrothermal vents, cold seeps, whale falls, sunken wood, and areas of low oxygen that intersect with continental margins and seamounts.
We will have sessions in which we will discuss the current state of knowledge of biogeography, biodiversity and abundance, ecology, origin and evolution, morphological and molecular phylogeny, and taxonomy, and future plans. Further we will discuss the possiblities of multidisciplinary and integrative research, building a platform of researchers to combine our efforts in databases, field programmes, and outreach activities.
Registration deadline: June 30, 2010

Any questions and suggestions: email to Monika Bright

Wednesday, June 16, 2010

12th Deep Sea Biology Symposium (Event recently finalized)


Reykjavík, Iceland, 7-11 June 2010
The 12th Deep-sea Biology Symposium is going to be held in Reykjavík, Iceland from June 7-11 (with a time-saving early sign-in on June 6th for those who wish to come the day before and sign in rather that doing it early on Monday morning). The University of Iceland will be hosting the event and there will be at least two excursions: one full day and one evening (we are still working out details of the rest of the social aspect of the week). The convener is Professor Jörundur Svavarsson.
We welcome you to the symposium home page and look forward to seeing you in June.

Photo top left - Organisms on bottom: Copyright, Centre for Geobiology, University of Bergen.

Program Book as a .pdf

June 8th, 2010
Well, the symposium is half finished, but it was brought to our atention that we needed to post the final copy of the book of abstracts here. Because of its size and the fact that it had to be sent in e-mail to me for upload, it is in three parts.
Program Book-part 1
Program Book-part 2
Program Book-part 3

More information here

Tuesday, June 15, 2010

Recent Publications On Meiofauna


Dongsung Kim1 and Yoshihisa ShirayamaContact Information
(1)  Marine Living Resources Research Division, Korea Ocean Research & Development Institute, Ansan P.O. Box 29, Seoul, 425-600, Korea
(2)  Seto Marine Biological Laboratory, Graduate School of Science, Kyoto University, Shirahama-cho, Wakayama 649-2211, Japan

Received: 10 September 2009  Revised: 24 November 2009  Accepted: 24 November 2009  Published online: 25 March 2010
Ingestion rates of free-living marine nematodes were measured using colloidal iron as a tracer. Detritus labeled with colloidal iron was fed to the dominant nematode species and cultured. The iron ingested by the animals was quantified using a scanning electron microscope equipped with differential X-ray energy analyzer (EDX). Average ingestion rates (µgC ind.−1day−1) measured were 0.28 for Symplocostoma sp., 0.29 for Polygastrophora sp., 0.73 for Mesacanthion sp. and 0.15 for Metachromadora sp. These values were higher than the values determined using radioactive organic materials as tracers, though the present method is considered to provide conservative values. This result thus strongly suggests that the ingestion rates of nematodes measured so far were underestimated, and the use of colloidal iron has advantages over the use of radioactive organic matter as a tracer.
Keywords  Ingestion rates - nematodes - colloidal iron - EDX - subtidal

Maria BalsamoContact Information, L. Guidi1, M. Ferraguti2, L. Pierboni1 and R. M. Kristensen3
(1)  Dipartimento di Scienze dell’Uomo, dell’Ambiente e della Natura, Università di Urbino, Urbino, Italy
(2)  Dipartimento di Biologia, Università di Milano, Via Celoria 26, 20133 Milan, Italy
(3)  Zoological Museum, Natural History Museum, University of Copenhagen, Universitetsparken 15, 2100 Copenhagen OE, Denmark

Received: 4 February 2009  Revised: 30 April 2009  Accepted: 11 May 2009  Published online: 30 June 2009
Communicated by H.-D. Franke.
Abstract  The genus Diuronotus (Gastrotricha Chaetonotida) includes two species, D. aspetos and D. rupperti; its morphological affinity with the genus Musellifer has been pointed out. Here, new morphological data from light and electron microscopy and the description of the spermatozoon of D. aspetos are reported, with the aim of clarifying the phylogenetic position of the genus. The mouth cavity has a wreath of stout, protrusible processes. The two secondary furcal tubes are inserted ventrally and are covered with elongate scales. All the caudal tubes contain a duo-gland adhesive system. Three kinds of ciliated sensory receptors are described for the first time in Diuronotus. The filiform spermatozoon consists of an acrosome, a nuclear-mitochondrial complex, and a flagellum. The acrosome including two long and different cones, the single, giant mitochondrion surrounding the nuclear base, and the axoneme arising from a deep nuclear ‘fossa’ appear as autapomorphic characters. The keeled, solid cuticular body scales and the spermatozoon with a supernumerary membrane are features shared with Musellifer delamarei. The structure of the accessory fibres is a strong spermatological similarity between the families Muselliferidae and Xenotrichulidae. Thus morphological and spermatological characters support the inclusion of D. aspetos and M. delamarei into the family Muselliferidae recently described. The comparative spermatology also suggests that Xenotrichulidae may be the sister group of Muselliferidae.

Keywords   Diuronotus aspetos  - Gastrotricha - Chaetonotida - Ultrastructure - Spermatozoon 


Ilse BartschContact Information
(1)  Forschungsinstitut Senckenberg, DZMB, c/o DESY, Notkestr. 85, 22607 Hamburg, Germany
Received: 9 April 2009  Revised: 14 October 2009  Accepted: 2 November 2009  Published online: 24 November 2009
Isobactrus is a worldwide-spread genus. Most species live in the upper and middle area of a more or less regularly emerged zone. The species diversity is distinctly higher in the northern than in the southern hemisphere. At present, the genus consists of 29 species. An analysis of the geographical distribution of 36 external morphological characters revealed a uniformity in the combination of states of northern Pacific species, but a heterogeneity in the characters of northern Atlantic species. Several character states demonstrate a distinct north/south or north/tropics/south distribution. A parsimony analysis revealed basal northern Atlantic clades, a northern Pacific clade that also includes Northern Atlantic species and an Indo-Pacific clade with a tropical area cluster. The present data suggest that the genus Isobactrus evolved in the Palaearctic Ocean and might represent a basal lineage within the family Halacaridae.

Keywords  Halacaroidea - Characters - Distribution - Phylogeny - Palaearctic Ocean 

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