The degree to which fine-scale habitat use by salmonid species and stocks varies within habitat types such as estuaries is not fully resolved.We sampled shallow shoreline and deeper main-stem channel habitats in the Columbia River estuary over 3 years to compare salmon species composition, migration timing, density, size, and production type (hatchery or natural). Results indicated a high degree of spatial heterogeneity in habitat occupancy by the five salmonid species that are native to the basin. Salmonid communities at two channel habitat sites were much more similar to each other than to the community at a shoreline site. Salmonids sampled at the shoreline site were primarily subyearling Chinook Salmon Oncorhynchus tshawytscha and Chum Salmon O. keta and yearling Coho Salmon O. kisutch, with few other salmonids present. In contrast, channel habitat contained a higher diversity of salmon species, with samples representing all species of anadromous salmonids, including Sockeye Salmon O. nerka and steelhead O. mykiss. Salmonids in deeper channel habitat were generally larger than salmonids found along the shore, and the proportion of hatchery-origin salmon was also higher in deep channel habitats. On a per-area basis, we also found much higher densities of salmon along the shoreline than in channel habitats. For Chinook Salmon, habitat use also differed by genetic stock of origin: upper-river stocks primarily used deeper channels, while lower-river populations used both channel and shoreline areas. We concluded that sampling at both habitat types is required to fully encompass the migration patterns of all salmon evolutionarily significant units in the Columbia River basin. These spatial and temporal variations in salmon timing and density have ramifications for feeding, growth, and competitive interactions. This study provides information that is relevant for conservation efforts targeting specific fish populations and efforts to evaluate the potential impacts of in-water activities in the Columbia River estuary.
Food provisioning of wildlife is a major concern for management and conservation agencies worldwide because it encourages unnatural behaviours in wild animals and increases each individual's risk for injury and death. Here we investigate the contribu...
Marine and Coastal Fisheries: Dynamics, Management, and Ecosystem Science 8(1), 522–535
Description:
An understanding of temporal patterns of migration and spatial connectivity between home ranges and spawning sites is necessary for effective management of species that form transient spawning aggregations. The Nassau Grouper Epinephelus striatus is ...
Lomeli, Mark J. M.; Hamel, Owen S.; Wakefield, W. Waldo;
Published Date:
2017
Source:
Marine and Coastal Fisheries: Dynamics, Management, and Ecosystem Science 9(1), 149–160
Description:
The limitedâ€entry bottom trawl fishery for groundfish along the U.S. West Coast operates under a catch share program, which is implemented with the intention of improving the economic efficiency of the fishery, maximizing fishing opportunities, and...
Leo, Jennifer P.; Minello, Thomas J.; Grant, William E.;
Published Date:
2018
Source:
Marine and Coastal Fisheries: Dynamics, Management, and Ecosystem Science 10(3), 347–356
Description:
Brown shrimp Farfantepenaeus aztecus support a commercially important fishery in the northern Gulf of Mexico, and the juvenile shrimp use coastal estuaries as nurseries. Production of young shrimp from these nurseries, and hence commercial harvest of...
Murawski, Steven A.; Peebles, Ernst B.; Gracia, Adolfo;
Published Date:
2018
Source:
Marine and Coastal Fisheries: Dynamics, Management, and Ecosystem Science 10(3), 325–346
Description:
We analyzed the results of the first comprehensive, systematic, fisheryâ€independent survey of Gulf of Mexico (GoM) continental shelves using data collected from demersal longline sampling off the United States, Mexico, and Cuba. In total, 166 speci...
Altenritter, Megan N.; Zydlewski, Gayle Barbin; Kinnison, Michael T.;
Published Date:
2017
Source:
Marine and Coastal Fisheries: Dynamics, Management, and Ecosystem Science 9(1), 216–230,
Description:
Atlantic Sturgeon Acipenser oxyrinchus oxyrinchus were recently listed as threatened in the Gulf of Maine and endangered in the rest of their U.S. range. Continued research priorities include long-term population monitoring, identifying the speciesâ€...
Marine and Coastal Fisheries: Dynamics, Management, and Ecosystem Science 9(1), 1–12
Description:
While Pacific salmon are known for their extensive marine migrations, some species display much more limited alternative patterns, including residence within interior marine waters. To more clearly define the scale of movement of these residents, we ...
Tuckey, Troy D.; Fabrizio, Mary C.; Norris, Alicia J.;
Published Date:
2017
Source:
Marine and Coastal Fisheries: Dynamics, Management, and Ecosystem Science 9(1), 564–572
Description:
Blue Catfish Ictalurus furcatus were purposefully introduced into freshwater tributaries to Chesapeake Bay in the past, and populations have subsequently spread to new areas, negatively impacting native communities and causing concern for resource ma...
McClatchie, Sam; Field, John; Thompson, Andrew R.;
Published Date:
2016
Source:
Royal Society Open Science, 3(3), 1-9
Description:
California sea lions increased from approximately 50 000 to 340 000 animals in the last 40 years, and their pups are starving and stranding on beaches in southern California, raising questions about the adequacy of their food supply. We investiga...
Lomeli, Mark J. M.; Wakefield, W. Waldo; Herrmann, Bent;
Published Date:
2017
Source:
Marine and Coastal Fisheries: Dynamics, Management, and Ecosystem Science 9(1), 597–611
Description:
In the U.S. West Coast limited-entry (LE) groundfish bottom trawl fishery, catches of stocks with restrictive harvest limits (e.g., Darkblotched Rockfish Sebastes crameri, Sablefish Anoplopoma fimbria, and Pacific Halibut Hippoglossus stenolepis) con...
Assessing the movement patterns and key habitat features of breeding humpback whales is a prerequisite for the conservation management of this philopatric species. To investigate the interactions between humpback whale movements and environmental con...
Tellus B: Chemical and Physical Meteorology, 68(1), 1-10
Description:
GasEx-98 was the first open-ocean process study where gas transfer velocity measurements were made with several robust techniques, including airside eddy covariance of CO2 and deliberate injection of 3He and SF6. While the CO2 eddy covariance results...
Harford, W. J.; Smith, S. G.; Ault, J. S.; Babcock, E. A.;
Published Date:
2016
Source:
Marine and Coastal Fisheries: Dynamics, Management, and Ecosystem Science 8(1), 147–159
Description:
In the Florida Keys coral reef ecosystem, delineation of reef fish distributions in relationship to habitat patterns is important for improving the design characteristics of fishery-independent surveys. Efficient survey design depends on analysis of ...
Acoustic communication is an important aspect of reproductive, foraging and social behaviours for many marine species. Northeast Pacific blue whales (Balaenoptera musculus) produce three different call types—A, B and D calls. All may be produced as...
Jackson, Jennifer A.; Carroll, Emma L.; Smith, Tim D.;
Published Date:
2016
Source:
Royal Society Open Science, 3(3), 1-16
Description:
Accurate estimation of historical abundance provides an essential baseline for judging the recovery of the great whales. This is particularly challenging for whales hunted prior to twentieth century modern whaling, as population-level catch records a...
Sagarese, Skyler R.; Frisk, Michael G.; Cerrato, Robert M.;
Published Date:
2016
Source:
Marine and Coastal Fisheries: Dynamics, Management, and Ecosystem Science 8(1), 244–262
Description:
This study examines the potential uncertainty in survey biomass estimates of Spiny Dogfish Squalus acanthias in the Northeast U.S. Continental Shelf Large Marine Ecosystem (NES LME). Diel catch-per-unit-effort (CPUE) estimates are examined from the N...
Marine and Coastal Fisheries: Dynamics, Management, and Ecosystem Science 8(1), 1–15
Description:
The spatial and temporal extent of summer hypoxia (dissolved oxygen [DO] concentration ≤ 2 mg/L) in Chesapeake Bay and its tributaries has been increasing for decades, consequently affecting fish distribution and abundance by shifting biomass to no...
Parsons, Kim M.; Everett, Meredith; Dahlheim, Marilyn;
Published Date:
2018
Source:
Royal Society Open Science, 5(8), 1-12
Description:
Determining management units for natural populations is critical for effective conservation and management. However, collecting the requisite tissue samples for population genetic analyses remains the primary limiting factor for a number of marine sp...
Arnold, Linsey M.; Smith, Wade D.; Spencer, Paul D.;
Published Date:
2018
Source:
Royal Society Open Science, 5(1), 1-11
Description:
Despite evidence of maternal age effects in a number of teleost species, there have been challenges to the assertion that maternal age intrinsically influences offspring quality. From an evolutionary perspective, maternal age effects result in young ...
Marine and Coastal Fisheries: Dynamics, Management, and Ecosystem Science 8(1), 595–606
Description:
The Atlantic Sturgeon Acipenser oxyrinchus has declined throughout its range, and the species is now protected under the U.S. Endangered Species Act. Information on the timing and extent of spawning migrations is essential for the development and imp...
Bett, Nolan N.; Hinch, Scott G.; Dittman, Andrew H.; Yun, Sang-Seon;
Published Date:
2016
Source:
Scientific Reports 6 (36393)
Description:
Pacific salmon (Oncorhynchus spp.) navigate towards spawning grounds using olfactory cues they imprinted on as juveniles. The timing at which imprinting occurs has been studied extensively, and there is strong evidence that salmon imprint on their na...
Murphy, Michael L.; Lorenz, Mitchel J.; Koski, K. Victor;
Corporate Authors:
Auke Bay Laboratory (Juneau, Alaska)
Published Date:
1991
Series:
NOAA technical memorandum NMFS F/NWC ; 203
File Type:
[PDF - 344.13 KB]
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