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Articles 61 - 90 of 282

Full-Text Articles in Marine Biology

A Management Strategy Evaluation Of The Impacts Of Interspecific Competition And Recreational Fishery Dynamics On Vermilion Snapper (Rhomboplites Aurorubens) In The Gulf Of Mexico, Megumi C. Oshima Dec 2020

A Management Strategy Evaluation Of The Impacts Of Interspecific Competition And Recreational Fishery Dynamics On Vermilion Snapper (Rhomboplites Aurorubens) In The Gulf Of Mexico, Megumi C. Oshima

Dissertations

In the Gulf of Mexico (GOM), Vermilion Snapper (Rhomboplites auroruben), are believed to compete with Red Snapper directly for prey and habitat. The two species share similar diets and have significant spatial overlap in the Gulf. Red Snapper are thought to be the dominate competitor, forcing Vermilion Snapper to feed on less nutritious prey when local resources are depleted. In addition to ecological pressures, GOM Vermilion Snapper support substantial commercial and recreational fisheries. Over the past decade, recreational landings have steadily increased, reaching a historical high in 2018. One cause may be stricter regulations for similar target species such as …

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The Impacts Of Fishing And Stochasticity On Saving Coral Reefs, Robyn Blevins, Jordan Penn, Christopher Stieha Nov 2020

The Impacts Of Fishing And Stochasticity On Saving Coral Reefs, Robyn Blevins, Jordan Penn, Christopher Stieha

Annual Symposium on Biomathematics and Ecology Education and Research

No abstract provided.

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Trip Bs01 - Perc Pll Trip Bs01 - Jun-July 2020 Set Data, David Kerstetter, Sean T. Wilms, Brittany N. Savercool, Ellyn Willse Jun 2020

Trip Bs01 - Perc Pll Trip Bs01 - Jun-July 2020 Set Data, David Kerstetter, Sean T. Wilms, Brittany N. Savercool, Ellyn Willse

PERC Pelagic Longline Field Datasheets

Field datasheets from pelagic longline sets in the western North Atlantic from 2020-2022.

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Trip Dk01 - Perc Pll Trip Dk01 - Jun-July 2020 Set 1, David Kerstetter, Sean T. Wilms, Brittany N. Savercool, Ellyn Willse Jun 2020

Trip Dk01 - Perc Pll Trip Dk01 - Jun-July 2020 Set 1, David Kerstetter, Sean T. Wilms, Brittany N. Savercool, Ellyn Willse

PERC Pelagic Longline Field Datasheets

Field datasheets from pelagic longline sets in the western North Atlantic from 2020-2022.

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Trip Dk01 - Perc Pll Trip Dk01 - Jun-July 2020 Set 3, David Kerstetter, Sean T. Wilms, Brittany N. Savercool, Ellyn Willse Jun 2020

Trip Dk01 - Perc Pll Trip Dk01 - Jun-July 2020 Set 3, David Kerstetter, Sean T. Wilms, Brittany N. Savercool, Ellyn Willse

PERC Pelagic Longline Field Datasheets

Field datasheets from pelagic longline sets in the western North Atlantic from 2020-2022.

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Trip Dk01 - Perc Pll Trip Dk01 - Jun-July 2020 Set 4, David Kerstetter, Sean T. Wilms, Brittany N. Savercool, Ellyn Willse Jun 2020

Trip Dk01 - Perc Pll Trip Dk01 - Jun-July 2020 Set 4, David Kerstetter, Sean T. Wilms, Brittany N. Savercool, Ellyn Willse

PERC Pelagic Longline Field Datasheets

Field datasheets from pelagic longline sets in the western North Atlantic from 2020-2022.

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Trip Bs01 - Perc Pll Trip Bs01 - Jun-July 2020 Set 1, David Kerstetter, Sean T. Wilms, Brittany N. Savercool, Ellyn Willse Jun 2020

Trip Bs01 - Perc Pll Trip Bs01 - Jun-July 2020 Set 1, David Kerstetter, Sean T. Wilms, Brittany N. Savercool, Ellyn Willse

PERC Pelagic Longline Field Datasheets

Field datasheets from pelagic longline sets in the western North Atlantic from 2020-2022.

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Trip Dk01 - Perc Pll Trip Dk01 - Jun-July 2020 Set 7, David Kerstetter, Sean T. Wilms, Brittany N. Savercool, Ellyn Willse Jun 2020

Trip Dk01 - Perc Pll Trip Dk01 - Jun-July 2020 Set 7, David Kerstetter, Sean T. Wilms, Brittany N. Savercool, Ellyn Willse

PERC Pelagic Longline Field Datasheets

Field datasheets from pelagic longline sets in the western North Atlantic from 2020-2022.

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Trip Dk01 - Perc Pll Trip Dk01 - Jun-July 2020 Set 5, David Kerstetter, Sean T. Wilms, Brittany N. Savercool, Ellyn Willse Jun 2020

Trip Dk01 - Perc Pll Trip Dk01 - Jun-July 2020 Set 5, David Kerstetter, Sean T. Wilms, Brittany N. Savercool, Ellyn Willse

PERC Pelagic Longline Field Datasheets

Field datasheets from pelagic longline sets in the western North Atlantic from 2020-2022.

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Trip Dk01 - Perc Pll Trip Dk01 - Jun-July 2020 Set 9, David Kerstetter, Sean T. Wilms, Brittany N. Savercool, Ellyn Willse Jun 2020

Trip Dk01 - Perc Pll Trip Dk01 - Jun-July 2020 Set 9, David Kerstetter, Sean T. Wilms, Brittany N. Savercool, Ellyn Willse

PERC Pelagic Longline Field Datasheets

Field datasheets from pelagic longline sets in the western North Atlantic from 2020-2022.

Go to article

Trip Dk01 - Perc Pll Trip Dk01 - Jun-July 2020 Set 10, David Kerstetter, Sean T. Wilms, Brittany N. Savercool, Ellyn Willse Jun 2020

Trip Dk01 - Perc Pll Trip Dk01 - Jun-July 2020 Set 10, David Kerstetter, Sean T. Wilms, Brittany N. Savercool, Ellyn Willse

PERC Pelagic Longline Field Datasheets

Field datasheets from pelagic longline sets in the western North Atlantic from 2020-2022.

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Trip Dk01 - Perc Pll Trip Dk01 - Jun-July 2020 Set 12, David Kerstetter, Sean T. Wilms, Brittany N. Savercool, Ellyn Willse Jun 2020

Trip Dk01 - Perc Pll Trip Dk01 - Jun-July 2020 Set 12, David Kerstetter, Sean T. Wilms, Brittany N. Savercool, Ellyn Willse

PERC Pelagic Longline Field Datasheets

Field datasheets from pelagic longline sets in the western North Atlantic from 2020-2022.

Go to article

Trip Dk01 - Perc Pll Trip Dk01 - Jun-July 2020 Set 8, David Kerstetter, Sean T. Wilms, Brittany N. Savercool, Ellyn Willse Jun 2020

Trip Dk01 - Perc Pll Trip Dk01 - Jun-July 2020 Set 8, David Kerstetter, Sean T. Wilms, Brittany N. Savercool, Ellyn Willse

PERC Pelagic Longline Field Datasheets

Field datasheets from pelagic longline sets in the western North Atlantic from 2020-2022.

Go to article

Trip Dk01 - Perc Pll Trip Dk01 - Jun-July 2020 Set 2, David Kerstetter, Sean T. Wilms, Brittany N. Savercool, Ellyn Willse Jun 2020

Trip Dk01 - Perc Pll Trip Dk01 - Jun-July 2020 Set 2, David Kerstetter, Sean T. Wilms, Brittany N. Savercool, Ellyn Willse

PERC Pelagic Longline Field Datasheets

Field datasheets from pelagic longline sets in the western North Atlantic from 2020-2022.

Go to article

Trip Dk01 - Perc Pll Trip Dk01 - Jun-July 2020 Trip Data, David Kerstetter, Sean T. Wilms, Brittany N. Savercool, Ellyn Willse Jun 2020

Trip Dk01 - Perc Pll Trip Dk01 - Jun-July 2020 Trip Data, David Kerstetter, Sean T. Wilms, Brittany N. Savercool, Ellyn Willse

PERC Pelagic Longline Field Datasheets

Field datasheets from pelagic longline sets in the western North Atlantic from 2020-2022.

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Bull Kelp (Nereocystic Lutkeana) Restoration And Management In Northern California, Olivia Johnson May 2020

Bull Kelp (Nereocystic Lutkeana) Restoration And Management In Northern California, Olivia Johnson

Master's Projects and Capstones

Northern California’s coastal marine ecosystems support one of the most productive and biodiverse habitats on the planet. Bull kelp forests (Nereocystic lutkeana) form habitats for an abundance of marine mammals, sea bird, fish, and invertebrates. In recent years, compounding ecological and climatic factors have disrupted the balance of the bull kelp forests and led to an unprecedented loss of bull kelp biomass and canopy cover. These areas that are typically teeming with marine life have shifted into a stable state of sea urchin barrens due to over grazing of bull kelp by purple sea urchins (Strongylocentrotus pupuratus). These sea urchin …

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Development Of Methods To Track Oyster Movement Under Field Conditions In North Inlet Estuary, South Carolina, Alyssa M. Leclaire May 2020

Development Of Methods To Track Oyster Movement Under Field Conditions In North Inlet Estuary, South Carolina, Alyssa M. Leclaire

Honors Theses

Eastern oyster (Crassostrea virginica) reefs provide important habitat structure and ecosystem services in saltmarsh tidal creek estuaries. Reef persistence depends on growth of resident individuals and regular recruitment to maintain suitable shell substrate. Boat wakes potentially physically displace oyster clumps. The objective of this research was to develop methods to track oyster clump position and biomass on two natural fringing oyster reefs in North Inlet estuary, South Carolina. Boat traffic (number of boats making wakes per day), oyster clump displacement (cm/d) over time, oyster biomass (g dry tissue), and condition index (biomass/g dry shell weight) were quantified from …

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Innovative Protection And Conservation Of Coral Reefs In Madagascar, Meghan Parker Apr 2020

Innovative Protection And Conservation Of Coral Reefs In Madagascar, Meghan Parker

Independent Study Project (ISP) Collection

Madagascar is home to approximately 3,450 kilometers of coral reefs, including some of the most biodiverse and valuable marine ecosystems in the Indian Ocean (Webster 2002). This online research project investigates the status of Madagascar’s coral reefs separated by region, threats that are facing the reefs and community-based solutions to protect and conserve the reefs. Conclusions of this online research suggest that most coral reefs in Madagascar are in relatively good health, although looming threats exist from overfishing, increased coastal populations, tourism, and warming waters. Community-based solutions are abundant and have proven effective, and can be implemented nation-wide, personalized to …

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Habitat Associations And Co-Occurrence Patterns Of Two Estuarine-Dependent Predatory Fishes, Mariah C. Livernois, Sean P. Powers, Mark A. Albins, John F. Mareska Jan 2020

Habitat Associations And Co-Occurrence Patterns Of Two Estuarine-Dependent Predatory Fishes, Mariah C. Livernois, Sean P. Powers, Mark A. Albins, John F. Mareska

University Faculty and Staff Publications

Estuarine-dependent fishes experience a wide range of environmental conditions, and most species exhibit distinct associations with particular habitats. However, similar species or multiple conspecifics often overlap spatiotemporally, which can result in ecological interactions that have consequences for behaviors that can shape the structure and function of ecosystems. We used a long-term gill-net data set (2001–2015) to investigate the habitat associations and cooccurrence patterns of two estuarine-dependent predatory fishes, Red Drum Sciaenops ocellatus and Spotted Seatrout Cynoscion nebulosus, in coastal Alabama, USA. Both species were associated with similar environmental conditions, primarily low dissolved oxygen and low salinity, especially when temperature was …

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Estimates Of Red Drum Mortality Via Acoustic Telemetry, T. Reid Nelson, Sean P. Powers Jan 2020

Estimates Of Red Drum Mortality Via Acoustic Telemetry, T. Reid Nelson, Sean P. Powers

University Faculty and Staff Publications

Subadult (age < 3) Red Drum Sciaenops ocellatus support a valuable recreational fishery, and mortality estimates for young Red Drum are needed for proper management. To obtain these estimates, age-1 and age-2 Red Drum were implanted with acoustic transmitters and external Floy tags in two coastal Alabama rivers (Fowl and Dog rivers). Fates of tagged fish were inferred from stationary receiver detections and active relocations over 1 year. These fates were used in a Bayesian multistate model to estimate instantaneous monthly and annual mortality and emigration rates for each river and overall from both rivers. Instantaneous monthly fishing mortality (F) ranged from 0.001 to 0.112 (annual F = 0.414) in Dog River, from 0.001 to 0.126 in Fowl River (annual F = 0.309), and was 0.001–0.054 (annual F = 0.337) overall. Instantaneous monthly natural mortality (M) ranged from 0.001 to 0.002 (annual M= 0.069) in Dog River, from 0.001 to 0.036 (annual M= 0.178) in Fowl River, and from 0.001 to 0.017 (annual M= 0.090) overall. The overall annual estimate of instantaneous total mortality (Z) was 0.435. The median escapement percentage was estimated at 36.3% (95% posterior credible interval = 19.5–56.0%) using M and Z from the overall model. Unfortunately, the error on this estimate was large and inconclusive as to whether the 30% escapement goal for juvenile Red Drum to the adult population from Dog and Fowl rivers is being met. Monthly residency estimates were typically greater than 0.90, and overall annual residency was estimated at 0.716. Fishing mortality estimates from the current study are higher than recent catch curve estimates that did not include young Red Drum. These results demonstrate that young Red Drum need to be accounted for when generating mortality estimates and provide needed data for the Red Drum recreational fishery.

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Distribution, Density, Movement, And Support For Management Of Mountain Sucker, Pantosteus Jordani, In The Black Hills Of South Dakota, Seth J. Fopma Jan 2020

Distribution, Density, Movement, And Support For Management Of Mountain Sucker, Pantosteus Jordani, In The Black Hills Of South Dakota, Seth J. Fopma

Electronic Theses and Dissertations

Mountain Sucker, Pantosteus jordani, is a cold-water species native to the Intermountain West. Fringe populations of Mountain Sucker have experienced declines in recent decades. The population of Mountain Sucker found in the Black Hills of South Dakota represents the eastern fringe of the species’ native range. Recognized as both an indicator of biologic health and as a species of greatest conservation need in South Dakota, recent studies have suggested significant declines in both distribution and abundance. Despite the recent study of Mountain Sucker in the region, increased understanding of Mountain Sucker ecology is needed to effectively manage for the conservation …

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The Vezo Communities And Fisheries Of The Coral Reef Ecosystem In The Bay Of Ranobe, Madagascar, Shane Abeare Dec 2019

The Vezo Communities And Fisheries Of The Coral Reef Ecosystem In The Bay Of Ranobe, Madagascar, Shane Abeare

LSU New Orleans Theses and Dissertations

Madagascar, a country whose extraordinary levels of endemism and biodiversity are celebrated globally by scientists and laymen alike, yet historically has received surprisingly little research attention, is the setting of the present dissertation. Here, I contribute to the need for applied research by: 1) focusing on the most intensely fished section of the Toliara Barrier Reef, the Bay of Ranobe; 2) characterizing the marine environment, the human population, and the fisheries; and 3) collecting the longest known time-series of data on fisheries of Madagascar, thereby providing a useful baseline for future analyses. In Chapter 1, the bathymetry of the Bay …

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River Report. State Of The Lower St. Johns River Basin, Florida: Water Quality, Fisheries, Aquatic Life, Contaminants, 2019, Environmental Protection Board, City Of Jacksonville, University Of North Florida, Jacksonville University, Gerry Pinto, Brian P. Zoellner, Christopher Baynard, Charles Closmann, Nisse Goldberg, Scott F. Jones, William Penwell, Radha Pyati, Adam E. Rosenblatt, Gretchen Bielmyer-Fraser Jan 2019

River Report. State Of The Lower St. Johns River Basin, Florida: Water Quality, Fisheries, Aquatic Life, Contaminants, 2019, Environmental Protection Board, City Of Jacksonville, University Of North Florida, Jacksonville University, Gerry Pinto, Brian P. Zoellner, Christopher Baynard, Charles Closmann, Nisse Goldberg, Scott F. Jones, William Penwell, Radha Pyati, Adam E. Rosenblatt, Gretchen Bielmyer-Fraser

State of the River Report

No abstract provided.

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Island Invasion: The Silent Crisis In Hawaii, Sophia Janssen Jan 2019

Island Invasion: The Silent Crisis In Hawaii, Sophia Janssen

Pomona Senior Theses

Keeping out invasive species may, upon first review, seem like a trivial environmental cry from ecologists and deep environmentalists; a belated wish to return to an undeveloped world where nature was pristine. However invasive species create problems that impact all of us and can have far more severe consequences than changing a stunning landscape. These problems are heightened in islands like Hawaii, where the fragile ecosystems have developed over centuries of evolution and adaptation. The introduction of a disease-carrying mosquito can put the people of Hawaii at risk to many vector-born illnesses and create an epidemic, taking human life. The …

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Short-Term Low Salinity Mitigates Effects Of Oil And Dispersant On Juvenile Eastern Oysters: A Laboratory Experiment With Implications For Oil Spill Response Activities, Meagan N. Schrandt, Sean Powers, F.Scott Rikard, Wilawan Thongda, Eric Peatman Sep 2018

Short-Term Low Salinity Mitigates Effects Of Oil And Dispersant On Juvenile Eastern Oysters: A Laboratory Experiment With Implications For Oil Spill Response Activities, Meagan N. Schrandt, Sean Powers, F.Scott Rikard, Wilawan Thongda, Eric Peatman

University Faculty and Staff Publications

Following the Deepwater Horizon oil spill, eastern oyster (Crassostrea virginica) reefs in the northern Gulf of Mexico were exposed to oil and various associated clean-up activities that may have compromised oyster reef health. Included in the exposure was oil, dispersant, and in some locales, atypical salinity regimes. Oil and dispersants can be detrimental to oysters and the effects of salinity depend on the level. In addition to these extrinsic factors, genetic diversity of oyster populations may help the oysters respond to stressors, as demonstrated in other systems. We used a 3×3×2 factorial design to experimentally examine the effects …

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Estimating Exploitation Rates In The Alabama Red Snapper Fishery Using A High-Reward Tag–Recapture Approach, Dana K. Sackett, Mattgew Catalano, J. Marcus Drymon, Sean P. Powers, Mark Albins Jan 2018

Estimating Exploitation Rates In The Alabama Red Snapper Fishery Using A High-Reward Tag–Recapture Approach, Dana K. Sackett, Mattgew Catalano, J. Marcus Drymon, Sean P. Powers, Mark Albins

University Faculty and Staff Publications

Accurate estimates of exploitation are essential to managing an exploited fishery. However, these estimates are often dependent on the area and vulnerable sizes of fish considered in a study. High-reward tagging studies offer a simple and direct approach to estimating exploitation rates at these various scales and in examining how model parameters impact exploitation rate estimates. These methods can ultimately provide a better understanding of the spatial dynamics of exploitation at smaller local and regional scales within a fishery—a measure often needed for more site-attached species, such as the Red Snapper Lutjanus campechanus. We used this approach to tag 724 …

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Compression And Relaxation Of Fishing Effort In Response To Changes In Length Of Fishing Season For Red Snapper (Lutjanus Campechanus) In The Northern Gulf Of Mexico, Sean P. Powers, Kevin Anson Jan 2018

Compression And Relaxation Of Fishing Effort In Response To Changes In Length Of Fishing Season For Red Snapper (Lutjanus Campechanus) In The Northern Gulf Of Mexico, Sean P. Powers, Kevin Anson

University Faculty and Staff Publications

A standard method used by fisheries managers to decrease catch and effort is to shorten the length of a fishery; however, data on recreational angler response to this simple approach are surprisingly lacking. We assessed the effect of variable season length on daily fishing effort, measured by using numbers of boat launches per day, anglers per boat, and anglers per day from video observations, in the recreational sector of the federal fishery for red snapper (Lutjanus campechanus) in coastal Alabama. From 2012 through 2017, season length fluctuated from 3 to 40 d. Daily effort, measured by using mean number of …

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River Report. State Of The Lower St. Johns River Basin, Florida: Water Quality, Fisheries, Aquatic Life, Contaminants, 2018, Environmental Protection Board, City Of Jacksonville, University Of North Florida, Jacksonville University, Gerry Pinto, Gretchen Bielmyer-Fraser, Nisse Goldberg, Anthony Ouellette, An-Phong Le, Radha Pyati, Charles Closmann, Brian P. Zoellner Jan 2018

River Report. State Of The Lower St. Johns River Basin, Florida: Water Quality, Fisheries, Aquatic Life, Contaminants, 2018, Environmental Protection Board, City Of Jacksonville, University Of North Florida, Jacksonville University, Gerry Pinto, Gretchen Bielmyer-Fraser, Nisse Goldberg, Anthony Ouellette, An-Phong Le, Radha Pyati, Charles Closmann, Brian P. Zoellner

State of the River Report

No abstract provided.

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The Utility Of Bioenergetics Modelling In Quantifying Predation Rates Of Marine Apex Predators: Ecological And Fisheries Implications, A. Barnett, M. Braccini, C. L. Dudgeon, N. L. Payne, K. G. Abrantes, M. Sheaves, E. P. Snelling Oct 2017

The Utility Of Bioenergetics Modelling In Quantifying Predation Rates Of Marine Apex Predators: Ecological And Fisheries Implications, A. Barnett, M. Braccini, C. L. Dudgeon, N. L. Payne, K. G. Abrantes, M. Sheaves, E. P. Snelling

Fisheries Research Articles

Predators play a crucial role in the structure and function of ecosystems. However, the magnitude of this role is often unclear, particularly for large marine predators, as predation rates are difficult to measure directly. If relevant biotic and abiotic parameters can be obtained, then bioenergetics modelling offers an alternative approach to estimating predation rates, and can provide new insights into ecological processes. We integrate demographic and ecological data for a marine apex predator, the broadnose sevengill shark Notorynchus cepedianus, with energetics data from the literature, to construct a bioenergetics model to quantify predation rates on key fisheries species in …

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Life History And Management Methods For Blueline Tilefish (Caulolatilus Microps) From The United States Mid-Atlantic Region, Michael A. Schmidtke Oct 2017

Life History And Management Methods For Blueline Tilefish (Caulolatilus Microps) From The United States Mid-Atlantic Region, Michael A. Schmidtke

OES Theses and Dissertations

Blueline tilefish (Caulolatilus microps) have recently undergone an increase in landings from waters off the US Mid-Atlantic region (Virginia-Massachusetts). Currently, life history characteristics of blueline tilefish in this area are undescribed. Additionally, appropriate indices of population abundance are not available for this region, necessitating the use of data-limited management methods to set restrictions for harvest of blueline tilefish in this area. This dissertation describes growth and reproductive characteristics of blueline tilefish caught off the coast of Virginia and explores improvements of data-limited management methods that have been applied to blueline tilefish in the US Mid-Atlantic. Blueline tilefish from …

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