Search Results - "Orth, R. J."

Critical evaluation of the nursery role hypothesis for seagrass meadows by Heck, K. L., Hays, G., Orth, R. J.

“…The vast majority of published papers concerning seagrass meadows contain statements to the effect that seagrass beds serve as important nurseries for many…”
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Herbivory regulates the establishment of a native species of submerged aquatic vegetation (SAV) in a tidal estuary of the USA by Johnson, A. J., Orth, R. J., Moore, K. A.

“…Herbivores are a diverse group of fauna that shape the distribution and composition of plant communities. In some cases, herbivory may prevent the…”
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A sediment bioturbator bottleneck to seedling recruitment for the seagrass Posidonia australis by Johnson, A. J., Statton, J., Orth, R. J., Kendrick, G. A.

“…Bioturbating animals have the potential to influence the distribution and survival of seagrass seeds and seedlings within unvegetated substrates. Such…”
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Seed Dispersal in a Marine Macrophyte: Implications for Colonization and Restoration by Orth, Robert J., Luckenbach, Mark, Moore, Kenneth A.

“…Seagrasses rely on both vegetative (rhizome elongation) and sexual (seeds) propagation for maintenance of existing beds and colonization of new areas. Yet…”
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Operation of the xanthophyll cycle in the seagrass Zostera marina in response to variable irradiance by Ralph, P.J, Polk, S.M, Moore, K.A, Orth, R.J, Smith, W.O

“…Changes in the photobiology and photosynthetic pigments of the seagrass Zostera marina from Chesapeake Bay (USA) were examined under a range of natural and…”
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Plant species diversity and composition: experimental effects on marine epifaunal assemblages by Parker, John D., Duffy, J. Emmett, Orth, Robert J.

“…Plant diversity is believed to govern animal community structure, yet few studies have tested this relationship. We manipulated plant species diversity and…”
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Recovery Dynamics of the Seagrass Zostera marina Following Mass Mortalities from Two Extreme Climatic Events by Johnson, A. J., Shields, E. C., Kendrick, G. A., Orth, R. J.

“…The marine angiosperm, Zostera marina , utilizes both asexual and sexual reproduction to grow, persist, and recover in dynamic environments. Sexual…”
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A review of issues in seagrass seed dormancy and germination: implications for conservation and restoration by Orth, Robert J., Harwell, Matthew C., Bailey, Eva M., Bartholomew, Aaron, Jawad, Jennifer T., Lombana, Alfonso V., Moore, Kenneth A., Rhode, Jennifer M., Woods, Helen E.

“…Seagrasses have received considerable attention over the past 2 decades because of the multiple ecological roles they play in estuarine and coastal ecosystems…”
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Analysis of the Abundance of Submersed Aquatic Vegetation Communities in the Chesapeake Bay by Moore, Kenneth A., Wilcox, David J., Orth, Robert J.

“…A procedure was developed using aboveground field biomass measurements of Chesapeake Bay submersed aquatic vegetation (SAV), yearly species identification…”
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Substrate selection by blue crab Callinectes sapidus megalopae and first juvenile instars by VAN MONTFRANS, Jacques, RYER, Clifford H, ORTH, Robert J

“…Various marine and estuarine species utilize chemical cues during settlement. We investigated responses by megalopae and first juvenile (J1) blue crabs to…”
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Density-Dependent Settler-Recruit-Juvenile Relationships in Blue Crabs by Pile, Adele J., Lipcius, Romuald N., van Montfrans, Jacques, Orth, Robert J.

“…Current theory on the population dynamics of marine species with complex life history patterns posits that a suite of physical and biotic forces (e.g., habitat…”
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Development of an electrically switched ion exchange process for selective ion separations by Rassat, S.D., Sukamto, J.H., Orth, R.J., Lilga, M.A., Hallen, R.T.

“…The electrically switched ion exchange (ESIX) process, being developed at Pacific Northwest National Laboratory, provides an alternative separation method to…”
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Relative effects of nutrient enrichment and grazing on epiphyte-macrophyte (Zostera marina L.) dynamics by Neckles, H.A, Wetzel, R.L, Orth, R.J

“…The independent and interactive effects of nutrient concentration and epiphyte grazers on epiphyte biomass and macrophyte growth and production were examined…”
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Zostera marina (eelgrass) growth and survival along a gradient of nutrients and turbidity in the lower Chesapeake Bay by Moore, Kenneth A., Neckles, Hilary A., Orth, Robert J.

“…Survival of transplanted Zostera marina L. (eelgrass), Z. marina growth, and environmental conditions were studied concurrently at a number of sites in a…”
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Eelgrass restoration by seed maintains genetic diversity: case study from a coastal bay system by Reynolds, Laura K., Waycott, Michelle, McGlathery, Karen J., Orth, Robert J., Zieman, Joseph C.

“…Genetic diversity is positively associated with plant fitness, stability, and the provision of ecosystem services. Preserving genetic diversity is therefore…”
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Ontogenetic changes in habitat use by postlarvae and young juveniles of the blue crab by Pardieck, Renee A., Orth, Robert J., Diaz, Robert J., Lipcius, Romuald N.

“…Changing habitat requirements are evident during the developmental cycles of many species. In this field investigation, we attempted to distinguish between…”
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Genetic Diversity and Structure of Natural and Transplanted Eelgrass Populations in the Chesapeake and Chincoteague Bays by Williams, Susan L., Orth, Robert J.

“…The objective of this study was to gain baseline population data on the genetic diversity and differentiation of eelgrass (Zostera marina L.) populations in…”
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The Identification, Conservation, and Management of Estuarine and Marine Nurseries for Fish and Invertebrates by Beck, Michael W., Heck, Kenneth L., Able, Kenneth W., Childers, Daniel L., Eggleston, David B., Gillanders, Bronwyn M., Halpern, Benjamin, Hays, Cynthia G., Hoshino, Kaho, Minello, Thomas J., Orth, Robert J., Sheridan, Peter F., Weinstein, Michael P.

“…Nearshore estuarine and marine ecosystems-e.g., seagrass meadows, marshes, and mangrove forests-serve many important functions in coastal waters. A better…”
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Chesapeake Bay: An Unprecedented Decline in Submerged Aquatic Vegetation by Orth, Robert J., Moore, Kenneth A.

“…Data on the distribution and abundance of submerged aquatic vegetation in Chesapeake Bay indicate a significant reduction in all species in all sections of the…”
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Seed-density effects on germination and initial seedling establishment in eelgrass Zostera marina in the Chesapeake Bay region by ORTH, Robert J, FISHMAN, James R, HARWELL, Matthew C, MARION, Scott R

“…The influence of Zostera marina seed-density on germination and initial seedling success was investigated using seed-addition field experiments at 2 scales in…”
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