The 62nd Annual Meeting of the Phycological Society of America. New Orleans, Louisiana, EUA, 27-30 de Julho de 2008

Fredericq, Suzanne

Gabriel, Daniela

Neto, Ana I.

Schils, Tom

Repositório da Universidade dos Açores

    i  The Phycological Society of America (PSA) was founded in 1946 to promote research and teaching in all fields of Phycology. The society publishes the Journal of Phycology and the Phycological Newsletter.  Annual meetings are held, often jointly with other national or international societies of mutual member interest. Phycological Society of America awards include the Bold Award for best student paper at the annual meeting, the new Student Poster Award for the best student poster at the annual meeting, the Provasoli Award for outstanding papers published in the Journal of Phycology, and the Prescott Award for the best Phycology book published within the previous two years. The society provides financial aid to graduate student members through Croasdale Fellowships for enrollment in phycology courses at biological stations, Hoshaw Travel Awards for travel to the annual society meeting, and Grants-In-Aid for supporting research. To join the Phycological Society of America, contact the membership director. Society Webpage: http://www.psaalgae.org/  LOCAL ORGANIZER FOR 2008 PSA ANNUAL MEETING:    James L. Wee, Loyola University, New Orleans  PSA EXECUTIVE COMMITTEE: President:     Robert A. Andersen, Bigelow Laboratory for Ocean Sciences Past President:   Richard E. Triemer, Michigan State University Vice President /President Elect Charles Amsler, University of Alabama, Birmingham Secretary     J. Craig Bailey, Univ. North Carolina, Wilmington Treasurer    Charles F. Delwiche, University of Maryland Membership Director   Roy L. Lehman, Texas A & M University- Corpus Christi Program Director   Terence J. Evens, USDA-Agricultural Research Service Chair, Board of Trustees  Richard McCourt, National Science Foundation Fund Manager of the Endowment Timothy A. Nelson, Seattle Pacific University Editor, Journal of Phycology  Robert Sheath, California State University San Marcos Communications Director  Juan M. Lopez-Bautista, University of Alabama, Tuscaloosa Student Representative   Daryl Lam, University of Alabama, Tuscaloosa   PSA BOARD OF TRUSTEES: Richard McCourt (Chair), National Science Foundation Timothy A. Nelson (Fund Manager), Seattle Pacific University Linda A. Franklin, Smithsonian Environmental Research Center Paul V. Zimba, USDA-Agricultural Research Service Gisèle T. Muller-Parker, Western Washington University Charles F. Delwiche*, University of Maryland Charles Amsler**, University of Alabama, Birmingham Robert A. Anderson**, Bigelow Laboratory for Ocean Sciences  *ex-officio member **ex-officio and non-voting member     ii     611:20 Physiology As A Reflection Of Habitat For Western South African Porphyra Species Michael S. Stekoll1, John J. Bolton2 and Robert J. Anderson3,2 1. Department of Natural Sciences, University of Alaska Southeast, Juneau, AK, USA; 2. Department of Botany, University of Cape Town, Cape Town, South Africa; 3. Seaweed Unit, Marine and Coastal Management, Cape Town, South Africa 11:40 A Quantitative Method for Measurement of Neutral Lipids in Chlorophycean Microalgae Wei Chen1,2, Chengwu Zhang1, Lirong Song2, Milton Sommerfeld1 and Qiang Hu1 1. Department of Applied Biological Sciences, Arizona State University, Mesa, AZ, USA; 2. State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, The Chinese Academy of Sciences, Wuhan, China 12:00 Photosynthetic response of the toxic raphidophyte Heterosigma akashiwo during the imposition of, and recovery from, light- and nutrient stress Hugh MacIntyre1,2, Marcel Babin1, Amélie Gelay1, Emily Goldman2, Yannick Huot1, Antoine Sciandra1 and Tim Sherman3 1. Laboratoire d’Oceanographie de Villefranche, Villefranche-sur-mer, France; 2. Dauphin Island Sea Lab, Dauphin Island, AL, USA; 3. University of South Alabama, Mobile, AL, USA  12:20 LUNCH BREAK  -- St. Charles Room, Danna Center Miller 114; Miller Hall, Tuesday Afternoon:      Phylogenetics & Taxonomy - II        Moderator: Juan Lopez-Bautista, University of Alabama 13:40 The correct identity of the species going under the name Schizymenia dubyi (Schizymeniaceae, Rhodophyta) in the Azores, based on molecular and morphological evidence Daniela Gabriel1,2, Tom Schils3, Ana I. Neto1 and Suzanne Fredericq2 1. Department of Biology, University of the Azores, Ponta Delgada, Portugal; 2. Department of Biology, University of Louisiana at Lafayette, Lafayette, LA, USA; 3. Marine Laboratory, University of Guam, Mangilao, GU, USA 14:00 Molecular systematics of Thorea (Rhodophyta, thoreales) in Brazil Orlando Necchi1, Patricia Salles1 and Mariana C. Oliveira2 1. Zoology and Botany, São Paulo State University, S. Jose Rio Preto, Brazil; 2. Botany, São Paulo University, São Paulo, Brazil 14:20 Phylogeography of Ishige with recognization of I. foliacea (Ishigeales, Phaeophyceae) Kyung Min Lee1, Ga Hun Boo1, Jong Arm Shin3, Rafael Riosmena-Rodriguez2 and Sung Min Boo1 1. Biology, Chungnam National University, Daejeon, South Korea; 2. Marine Biology, UABCS, Las Paz B.C.B., Mexico; 3. Fishery, Cheonnam National University, Yeosu, South Korea 14:40 Subaerial microchlorophytes from West Central Africa: morphological convergence in tropical rain forests Haj A. Allali and Juan M. Lopez-Bautista Biological Sciences, University of Alabama, Tuscaloosa, AL, USA     32assessment of intracellular neutral lipids in representative green microalgae and appears to be a useful high throughput technique for quick screening of a broader spectrum of algae for neutral lipids.  29 Photosynthetic response of the toxic raphidophyte Heterosigma akashiwo during the imposition of, and recovery from, light- and nutrient stress MacIntyre, Hugh1,2, Babin, Marcel1, Gelay, Amélie1, Goldman, Emily2, Huot, Yannick1, Sciandra, Antoine1 & Sherman, Tim3 1Laboratoire d’Oceanographie de Villefranche, Villefranche-sur-mer, France; 2Dauphin Island Sea Lab, Dauphin Island, AL, USA; 3University of South Alabama, Mobile, AL, USA  The toxic raphidophyte Heterosigma akashiwo was subjected to simultaneous nutrient- and light stress by cutting off the nitrate supply to continuous cultures that were acclimated to growth-saturating irradiance. Cell division ceased on exhaustion of available nitrate and cell volume increased by 60% over 3 days. There was a 2.5x increase in the cellular carbon quota, primarily due to a 6x increase in carbohydrate content. There were no significant changes in cellular nitrogen or chlorophyll quotas. Both the light-limited and light-saturated rates of photosynthesis declined during N-starvation. The reduction in the light-saturated rate was greater than the loss in the light-limited rate (60% vs 30%). This degradation in photosynthetic performance was correlated with losses of ATPase, the PSII reaction center protein D1 and the carboxylating enzyme Rubisco. There was a rise in the de-epoxidation state of the xanthophylls in both saturating light and darkness, in parallel with a loss of D1 relative to Rubisco. This is consistent with the reduced photosynthetic competence arising partially from slippage in the coupling between electron transport and the Calvin Cycle. The cells returned to the acclimated, nutrient-replete state within 36 hours of nitrate being re-supplied. These data suggest that this clone of H. akashiwo has a remarkable resistance to and very rapid recovery from photoinhibition arising from light stress during nutrient starvation. This may play a role in its ability to bloom in surface waters with intermittent nutrient supply.  30 The correct identity of the species going under the name Schizymenia dubyi (Schizymeniaceae, Rhodophyta) in the Azores, based on molecular and morphological evidence Gabriel, Daniela1,2, Schils, Tom3, Neto, Ana I.1 & Fredericq, Suzanne2 1Department of Biology, University of the Azores, Ponta Delgada, Portugal; 2Department of Biology, University of Louisiana at Lafayette, Lafayette, LA, USA; 3Marine Laboratory, University of Guam, Mangilao, GU, USA  Within the Nemastomatales, the genus Schizymenia (Schizymeniaceae) has the broadest geographical distribution, with other genera in the order (e.g., Platoma, Predaea, and Titanophora) mainly found in the (sub)tropics. The genus that currently comprises ten species was established by J. Agardh in 1851, with type Schizymenia dubyi (Chauvin ex Duby) J. Agardh described from Atlantic France. Seven species names have been recognized as synonyms of Schizymenia dubyi, namely Haematophloea crouaniorum; Haematocelis epiphytica; Haematocelis rubens; Schizymenia minor; Schizymenia obovata; Schizymenia undulate; and Turnerella atlantica. Comparative rbcL sequence analysis indicates that S. dubyi specimens from the Azores should be referred to as S. apoda, a species described from the Cape Province in South Africa and also known from China and Namibia. Schizymenia rbcL sequences from Japan comprise two species; S. dubyi and a species here provisionally identified as S. novae-zelandiae. S. pacifica from Washington, Pacific USA, is the fourth distinct Shizymenia species. Morphological observations on S. apoda from the Azores are provided,     33and the presence of secondary pit connections is newly reported in gametophytes within the Nemastomatales.  31 Molecular systematics of Thorea (Rhodophyta, thoreales) in Brazil Necchi, Orlando1, Salles, Patricia1 & Oliveira, Mariana C.2 1Zoology and Botany, São Paulo State University, S. Jose Rio Preto, Brazil; 2Botany, São Paulo University, São Paulo, Brazil  This study aimed at evaluate species level taxonomy and phylogenetic relationship among Thorea species in Brazil and other regions of the world using two molecular markers - RUBISCO large subunit plastid gene (rbcL) and nuclear small-subunit ribosomal DNA (SSU rDNA). Three samples of Thorea from Brazil were sequenced, one from São Paulo and two from Mato Grosso do Sul states; a sample from Dominican Republic (DR) was also sequenced for comparison. Tree based on partial rbcL sequences (1,282 bp) revealed two major clades, representing genera: Thorea and Nemalionopsis. Thorea clade had two main branches with high bootstrap support (≥ 90%), representing species: T. violacea (including T. gaudichaudii from Asia and T. riekei from U.S.A.) and T. hispida (including T. okadae from Japan). Sequences of T. gaudichaudii formed a distinct clade (100% support) and with a high variation (110-196 bp, 8.6-15.3%) in comparison to the other samples of T. violacea (3-151 bp, 0.2-11.6%); they might represent a distinct specific or infra-specific taxon. Tree based on complete SSU rDNA sequences (1,753 bp) was essentially similar to rbcL tree with two major clades with high support (≥ 95%), representing the genera T. hispida and Nemalionopsis. Two clades with high bootstrap support (≥ 95%) were recognized within Thorea clade, representing species: T. violacea and T. hispida. Brazilian specimens were recognized as T. hispida on the basis of both SSU and rbcL sequences, as well as morphological comparison. However, a relatively high variation in comparison to other samples of this species was observed (112-212 bp = 8,7-16,5% x 1-82 pb = 0,1-6,4% for rbcL; 91-158 bp = 4,5-9,5% x 14-68 pb = 0,8-3,9% for SSU). Thus, they might represent a distinct species or a infra-specific taxon of T. hispida, but they are provisionally kept as T. hispida, since there is no clear basis for distinction. DR sample grouped, as expected, with other North American populations of T. violacea. A worldwide revision of Thorea is recommended based on molecular and morphological data. Thoreales consistently appeared as monophyletic with high support (≥ 95%) in trees based on both molecular markers.  32 Phylogeography of Ishige with recognization of I. foliacea (Ishigeales, Phaeophyceae) Lee, Kyung Min1, Boo, Ga Hun1, Shin, Jong Arm3, Riosmena-Rodriguez, Rafael2 & Boo, Sung Min1 1Biology, Chungnam National University, Daejeon, South Korea; 2Marine Biology, UABCS, Las Paz B.C.B., Mexico; 3Fishery, Cheonnam National University, Yeosu, South Korea  Common species occurring between geographically isolated regions are an interesting issue for taxonomy and biogeography. Ishige Yendo, previously included two species, inhabits the warm waters of the northwest and the northeast regions of Pacific Ocean. We determined the sequences of mitochondrial cox3 and plastid rbcL from 127 samples of the genus collected over its distribution range. Analyses of the cox3 and rbcL sequences resulted in similar trees that Ishige well resolved, but I. sinicola (Setchell and Gardner) Chihara consisted of two distinct clades: one for samples from Korea and Japan and the other from Mexico. Based on this result, we reinstated I. foliacea Okamura for samples from the northwest Pacific, which was previously synonymized with I. sinicola from Mexico. Ishige foliacea is circumscribed by large and wide thalli (up to 15 cm), and an epitype for the species is 

The correct identification of the species going under the name Scizymenia dubyi (Schizymeniaceae, Rhodophyta) in the Azores, based on molecular and morphological evidences.

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The correct identification of the species going under the name Scizymenia dubyi (Schizymeniaceae, Rhodophyta) in the Azores, based on molecular and morphological evidences.

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