Home Growth, reproduction, and senescence of the epiphytic marine alga Phaeosaccion collinsii Farlow (Ochrophyta, Phaeothamniales) at its type locality in Nahant, Massachusetts, USA
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Growth, reproduction, and senescence of the epiphytic marine alga Phaeosaccion collinsii Farlow (Ochrophyta, Phaeothamniales) at its type locality in Nahant, Massachusetts, USA

  • Ashley E. Cryan

    Ashley E. Cryan is a marine scientist and educator and a specialist in algal biology and ecology. She has worked as a research assistant at Woods Hole Oceanographic Institution, Northeastern University’s Marine Science Center, and at San Francisco State University’s Romberg Tiburon Center for Environmental Studies. In 2013 she received the Physical and Life Sciences award from Northeastern University’s Center for Research Innovation for her research on harmful algal blooms and climate change in the Gulf of Maine. Ashley plans to pursue graduate study in oceanography and limnology and continue researching the effects of oceanic climate change on marine species and ecosystems.

    , Kylla M. Benes

    Kylla M. Benes is a PhD candidate at the University of California, Irvine, in the Department of Ecology and Evolutionary Biology. She was awarded a MSc from California State University, Northridge, in 2006 for research on secondary succession in kelp forest algal communities. Broadly, she is interested in causes and consequences of changes in biodiversity, particularly intraspecific diversity. Currently, her research focuses on nutrient physiology, local adaptation, and population structure of intertidal seaweeds.

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    , Brendan Gillis

    Brendan Gillis received a BA from Boston University and a MSc from Northeastern University’s Department of Biology. His research focused on the effects of climate change on seaweed biodiversity and species interactions.

    , Christine Ramsay-Newton

    Christine Ramsay-Newton was awarded a PhD in Ecology, Evolution and Marine Biology from Northeastern University’s Marine Science Center for her work on the ecology surrounding invasive seaweeds. She also received her MSc from the University of Rhode Island for her research on estuarine ecology, specifically the impacts of macroalgal blooms on salt marsh habitats. Her research interests include algal ecology, estuarine ecology, invasive species, and invertebrate ecology.

    , Valerie Perini

    Valerie Perini is an educator with expertise in marine biology and outdoor education. She earned her Bachelor and Master of Science degrees in Biology at Northeastern University. For her master’s thesis project, she worked with Dr. Matthew Bracken collecting longitudinal data documenting nutrient availability in intertidal communities in the Southern Gulf of Maine and quantifying the impacts of nutrient fluctuations on primary producers, herbivores, and community-wide nutrient cycling. Currently, as the Senior Outreach Educator at Northeastern University’s Marine Science Center, Valerie leverages her dual passions for marine biology and science communication to share cutting edge marine science research with students, educators, and the general public via planning and leading outdoor education programs and public events as well as developing web content highlighting scientific research.

    and Michael J. Wynne

    Michael J. Wynne is Emeritus Professor at the University of Michigan, Ann Arbor. He earned his PhD in Botany at the University of California, Berkeley. He spent most of his professional career at the University of Michigan, Ann Arbor. He co-authored (with H.C. Bold) the textbook Introduction to the algae: structure and reproduction (1978, 1985). He co-edited (with C.S. Lobban) the books Biology of seaweeds (1981) and (with D.J. Garbary) Prominent phycologists of the 20th century (1996). He authored Portraits of marine algae: an historical perspective (2007) and The red algal families Delesseriaceae and Sarcomeniaceae (2014). He produced A checklist of benthic marine algae of the tropical and subtropical Western Atlantic (1986, 1998, 2005, 2011).

Published/Copyright: July 8, 2015

Abstract

The growth, reproduction, and senescence patterns of the epiphytic marine alga Phaeosaccion collinsii were tracked over two consecutive seasons at its type locality of Little Nahant, Nahant, MA (USA). We investigated the potential and/or combined effects of temperature and ambient nutrient supply (NO3- and PO43-) on the phenology of this ephemeral species in its natural environment by collecting microscopic and macroscopic P. collinsii specimens from blades of eelgrass (Zostera marina) in a shallow coastal subtidal zone. Our results suggest that temperature is a strong driver of the alga’s in situ cycle and that the optimal temperature for P. collinsii growth and reproduction may be between 5 and 8°C, a narrower temperature threshold than previous laboratory studies on this subject have suggested. Several large winter storms also allowed us to observe the effect of physical disturbance on the integrity of the eelgrass beds and the population of microscopic and macroscopic P. collinsii. This study contributes the first in situ information on the abiotic conditions necessary for the successful growth and development of P. collinsii and a greater understanding of the life cycle of this unique golden brown alga.


Corresponding author: Kylla M. Benes, Northeastern University, Marine Science Center, 430 Nahant Road, Nahant, MA 01902, USA; and University of California, Department of Ecology and Evolutionary Biology, 321 Steinhaus Hall, Irvine, CA 92697-2525, USA, e-mail:

About the authors

Ashley E. Cryan

Ashley E. Cryan is a marine scientist and educator and a specialist in algal biology and ecology. She has worked as a research assistant at Woods Hole Oceanographic Institution, Northeastern University’s Marine Science Center, and at San Francisco State University’s Romberg Tiburon Center for Environmental Studies. In 2013 she received the Physical and Life Sciences award from Northeastern University’s Center for Research Innovation for her research on harmful algal blooms and climate change in the Gulf of Maine. Ashley plans to pursue graduate study in oceanography and limnology and continue researching the effects of oceanic climate change on marine species and ecosystems.

Kylla M. Benes

Kylla M. Benes is a PhD candidate at the University of California, Irvine, in the Department of Ecology and Evolutionary Biology. She was awarded a MSc from California State University, Northridge, in 2006 for research on secondary succession in kelp forest algal communities. Broadly, she is interested in causes and consequences of changes in biodiversity, particularly intraspecific diversity. Currently, her research focuses on nutrient physiology, local adaptation, and population structure of intertidal seaweeds.

Brendan Gillis

Brendan Gillis received a BA from Boston University and a MSc from Northeastern University’s Department of Biology. His research focused on the effects of climate change on seaweed biodiversity and species interactions.

Christine Ramsay-Newton

Christine Ramsay-Newton was awarded a PhD in Ecology, Evolution and Marine Biology from Northeastern University’s Marine Science Center for her work on the ecology surrounding invasive seaweeds. She also received her MSc from the University of Rhode Island for her research on estuarine ecology, specifically the impacts of macroalgal blooms on salt marsh habitats. Her research interests include algal ecology, estuarine ecology, invasive species, and invertebrate ecology.

Valerie Perini

Valerie Perini is an educator with expertise in marine biology and outdoor education. She earned her Bachelor and Master of Science degrees in Biology at Northeastern University. For her master’s thesis project, she worked with Dr. Matthew Bracken collecting longitudinal data documenting nutrient availability in intertidal communities in the Southern Gulf of Maine and quantifying the impacts of nutrient fluctuations on primary producers, herbivores, and community-wide nutrient cycling. Currently, as the Senior Outreach Educator at Northeastern University’s Marine Science Center, Valerie leverages her dual passions for marine biology and science communication to share cutting edge marine science research with students, educators, and the general public via planning and leading outdoor education programs and public events as well as developing web content highlighting scientific research.

Michael J. Wynne

Michael J. Wynne is Emeritus Professor at the University of Michigan, Ann Arbor. He earned his PhD in Botany at the University of California, Berkeley. He spent most of his professional career at the University of Michigan, Ann Arbor. He co-authored (with H.C. Bold) the textbook Introduction to the algae: structure and reproduction (1978, 1985). He co-edited (with C.S. Lobban) the books Biology of seaweeds (1981) and (with D.J. Garbary) Prominent phycologists of the 20th century (1996). He authored Portraits of marine algae: an historical perspective (2007) and The red algal families Delesseriaceae and Sarcomeniaceae (2014). He produced A checklist of benthic marine algae of the tropical and subtropical Western Atlantic (1986, 1998, 2005, 2011).

Acknowledgments

We would like to thank Dr. James Douglass for help with fieldwork and Dr. Matthew Bracken for use of field equipment and laboratory space and instrumentation. Comments from M. Dring and two anonymous reviewers greatly improved the original manuscript.

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Received: 2015-2-21
Accepted: 2015-5-28
Published Online: 2015-7-8
Published in Print: 2015-8-1

©2015 by De Gruyter

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