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https://www.readbyqxmd.com/read/28905373/interactions-between-range-expanding-tropical-fishes-and-the-northern-gulf-of-mexico-red-snapper-lutjanus-campechanus
#1
A R Marshak, K L Heck
Experimental investigation of the intensity of potential competitive interactions among increasingly abundant tropically-associated grey Lutjanus griseus and lane snapper Lutjanus synagris and resident northern Gulf of Mexico (nGOM) red snapper Lutjanus campechanus was undertaken in large outdoor mesocosms. In pair-wise interaction trials, compared with L. synagris, L. campechanus demonstrated significantly increased roving behaviour and predatory activity. While no significant difference in these activities was observed between L...
September 14, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28902904/assessing-coastal-wetland-vulnerability-to-sea-level-rise-along-the-northern-gulf-of-mexico-coast-gaps-and-opportunities-for-developing-a-coordinated-regional-sampling-network
#2
Michael J Osland, Kereen T Griffith, Jack C Larriviere, Laura C Feher, Donald R Cahoon, Nicholas M Enwright, David A Oster, John M Tirpak, Mark S Woodrey, Renee C Collini, Joseph J Baustian, Joshua L Breithaupt, Julia A Cherry, Jeremy R Conrad, Nicole Cormier, Carlos A Coronado-Molina, Joseph F Donoghue, Sean A Graham, Jennifer W Harper, Mark W Hester, Rebecca J Howard, Ken W Krauss, Daniel E Kroes, Robert R Lane, Karen L McKee, Irving A Mendelssohn, Beth A Middleton, Jena A Moon, Sarai C Piazza, Nicole M Rankin, Fred H Sklar, Greg D Steyer, Kathleen M Swanson, Christopher M Swarzenski, William C Vervaeke, Jonathan M Willis, K Van Wilson
Coastal wetland responses to sea-level rise are greatly influenced by biogeomorphic processes that affect wetland surface elevation. Small changes in elevation relative to sea level can lead to comparatively large changes in ecosystem structure, function, and stability. The surface elevation table-marker horizon (SET-MH) approach is being used globally to quantify the relative contributions of processes affecting wetland elevation change. Historically, SET-MH measurements have been obtained at local scales to address site-specific research questions...
2017: PloS One
https://www.readbyqxmd.com/read/28900798/phenotypic-plasticity-in-gene-expression-and-physiological-response-in-red-drum-sciaenops-ocellatus-exposed-to-a-long-term-freshwater-environment
#3
Mariel Gullian Klanian, Omar Zapata Pérez, Miguel Angel Vela-Magaña
Red drum (Sciaenops ocellatus) is a euryhaline fish commonly found in the Gulf of Mexico and along the Atlantic coast of North America. Because of high commercial demand and its euryhaline characteristics, aquaculture of this species has diversified from marine to low-salinity aquaculture systems. In recent years, interest in the feasibility of producing red drum in inland freshwater systems has grown and this prompted us to investigate its osmoregulatory capacity after rearing for 8 months in a freshwater aquaculture system...
September 12, 2017: Fish Physiology and Biochemistry
https://www.readbyqxmd.com/read/28900024/metabolic-roles-of-uncultivated-bacterioplankton-lineages-in-the-northern-gulf-of-mexico-dead-zone
#4
J Cameron Thrash, Kiley W Seitz, Brett J Baker, Ben Temperton, Lauren E Gillies, Nancy N Rabalais, Bernard Henrissat, Olivia U Mason
Marine regions that have seasonal to long-term low dissolved oxygen (DO) concentrations, sometimes called "dead zones," are increasing in number and severity around the globe with deleterious effects on ecology and economics. One of the largest of these coastal dead zones occurs on the continental shelf of the northern Gulf of Mexico (nGOM), which results from eutrophication-enhanced bacterioplankton respiration and strong seasonal stratification. Previous research in this dead zone revealed the presence of multiple cosmopolitan bacterioplankton lineages that have eluded cultivation, and thus their metabolic roles in this ecosystem remain unknown...
September 12, 2017: MBio
https://www.readbyqxmd.com/read/28898602/parallel-patterns-of-host-specific-morphology-and-genetic-admixture-in-sister-lineages-of-a-commensal-barnacle
#5
Christine Ewers-Saucedo, Benny K K Chan, John D Zardus, John P Wares
Symbiotic relationships are often species specific, allowing symbionts to adapt to their host environments. Host generalists, on the other hand, have to cope with diverse environments. One coping strategy is phenotypic plasticity, defined by the presence of host-specific phenotypes in the absence of genetic differentiation. Recent work indicates that such host-specific phenotypic plasticity is present in the West Pacific lineage of the commensal barnacle Chelonibia testudinaria (Linnaeus, 1758). We investigated genetic and morphological host-specific structure in the genetically distinct Atlantic sister lineage of C...
June 2017: Biological Bulletin
https://www.readbyqxmd.com/read/28892204/crude-oil-toxicity-to-the-fiddler-crabs-uca-longisignalis-and-uca-panacea-from-the-northern-gulf-of-mexico-impacts-on-bioturbation-oxidative-stress-and-histology-of-the-hepatopancreas
#6
Marco E Franco, Bruce E Felgenhauer, Paul L Klerks
The intensive drilling and extraction of fossil fuels in the Gulf of Mexico result in a considerable risk for oil spills impacting its coastal ecosystems. Impacts are more likely to be far-reaching if the oil affects ecosystem engineers like fiddler crabs, whose activities modify biogeochemical processes in the sediment. The present study investigated effects of oil on the fiddler crabs Uca longisignalis and Uca panacea; important as ecosystem engineers and as prey for a wide variety of species. The present study used mesocosms and microcosms to investigate effects of crude oil on fiddler crab burrowing and to assess cellular and tissue damage by the oil...
September 11, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28888711/fluorescence-characteristics-in-the-deep-waters-of-south-gulf-of-m%C3%A3-xico
#7
I Schifter, G Sánchez-Reyna, C González-Macías, L Salazar-Coria, C González-Lozano
Vertical profiles of deep-water fluorescence determined by the chlorophyll sensor, polycyclic aromatic hydrocarbons, biomarkers, and other miscellaneous parameters measured in the southern Gulf of Mexico are reported. In the course of the survey, unexpected deep fluorescences were recorded (>1100m depth) in half of the 40 stations studied, a novel finding in this area of the Gulf. Currently, the deep-water fluorescence phenomenon is not completely understood, however we observe linear correlation between the fluorescence intensity and chlorophyll-α concentrations and coincidence of higher number of hydrocarbonoclastic bacteria in samples collected precisely in the deep-water fluorescence...
September 7, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28886098/molecular-and-biochemical-responses-of-hypoxia-exposure-in-atlantic-croaker-collected-from-hypoxic-regions-in-the-northern-gulf-of-mexico
#8
Md Saydur Rahman, Peter Thomas
A major impact of global climate change has been the marked increase worldwide in the incidence of coastal hypoxia (dissolved oxygen, DO<2.0 mg l-1). However, the extent of hypoxia exposure to motile animals such as fish collected from hypoxic waters as well as their molecular and physiological responses to environmental hypoxia exposure are largely unknown. A suite of potential hypoxia exposure biomarkers was evaluated in Atlantic croaker collected from hypoxic and normoxic regions in the northern Gulf of Mexico (nGOM), and in croaker after laboratory exposure to hypoxia (DO: 1...
2017: PloS One
https://www.readbyqxmd.com/read/28881955/calling-behavior-copulation-time-and-reproductive-compatibility-of-corn-strain-fall-armyworm-lepidoptera-noctuidae-from-populations-in-mexico
#9
Samuel Cruz-Esteban, Julio C Rojas, Edi A Malo
The calling behavior, mating time, and the reproductive compatibility of virgin adults of fall armyworms, Spodoptera frugiperda (J. E. Smith), were studied in this work. Larvae were collected on maize (Zea mays L.) from six states located on the Pacific coast (Chiapas, Michoacán, and Sinaloa), on the Gulf of Mexico (Veracruz and Yucatan), and in central Mexico (Morelos). Before the experiments, insects were reared under laboratory conditions for one generation. We recorded the age at which females called for the first time, the onset time of calling, the duration of calling, the onset time of copulation, and the duration of copulation...
August 1, 2017: Environmental Entomology
https://www.readbyqxmd.com/read/28880893/trends-in-summer-bottom-water-temperatures-on-the-northern-gulf-of-mexico-continental-shelf-from-1985-to-2015
#10
R Eugene Turner, Nancy N Rabalais, Dubravko Justić
We quantified trends in the 1985 to 2015 summer bottom-water temperature on the northern Gulf of Mexico (nGOM) continental shelf for data collected at 88 stations with depths ranging from 3 to 63 m. The analysis was supplemented with monthly data collected from 1963 to 1965 in the same area. The seasonal summer peak in average bottom-water temperature varied concurrently with air temperature, but with a 2- to 5-month lag. The summer bottom-water temperature declined gradually with depth from 30 oC at stations closest to the shore, to 20 oC at the offshore edge of the study area, and increased an average 0...
2017: PloS One
https://www.readbyqxmd.com/read/28863585/geographic-variation-in-risso-s-dolphin-echolocation-click-spectra
#11
Melissa S Soldevilla, Simone Baumann-Pickering, Danielle Cholewiak, Lynne E W Hodge, Erin M Oleson, Shannon Rankin
Discrimination of bioacoustic signals to the species or population level is critical for using passive acoustic monitoring to study cetacean ecology. Risso's dolphins off southern California have distinctive peaks and notches in their echolocation clicks, but it was unknown whether Risso's dolphins from other geographic areas have similarly distinctive click spectra and whether populations are acoustically distinct. This study investigates using clicks for species and population identification by characterizing the spectral structure of Risso's dolphin echolocation clicks recorded over wide-ranging geographic regions including the U...
August 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28861249/influence-of-density-dependent-competition-on-foraging-and-migratory-behavior-of-a-subtropical-colonial-seabird
#12
Juliet S Lamb, Yvan G Satgé, Patrick G R Jodice
Density-dependent competition for food resources influences both foraging ecology and reproduction in a variety of animals. The relationship between colony size, local prey depletion, and reproductive output in colonial central-place foragers has been extensively studied in seabirds; however, most studies have focused on effects of intraspecific competition during the breeding season, while little is known about whether density-dependent resource depletion influences individual migratory behavior outside the breeding season...
August 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28858712/bioaccumulation-of-trace-metals-in-farmed-pacific-oysters-crassostrea-gigas-from-sw-gulf-of-california-coast-mexico
#13
M P Jonathan, N P Muñoz-Sevilla, Andrés Martin Góngora-Gómez, Raquel Gabriela Luna Varela, S B Sujitha, D C Escobedo-Urías, P F Rodríguez-Espinosa, Lorena Elizabeth Campos Villegas
The aim of the study was to evaluate the bioavailability of trace metals (Chromium, Copper, Nickel, Lead, Zinc, Cadmium, Arsenic, and Mercury) in the commercially consumed Crassostrea gigas oysters collected over a 12-month growth period (2011-12) from an experimental cultivation farm in La Pitahaya, Sinaloa State, Mexico. Sediment and water samples were also collected from four different zones adjacent to the cultivation area to identify the concentration patterns of metals. The results revealed that sewage disposals, fertilizers used for agricultural practices and shrimp culture are the major sources for the enrichment of certain toxic metals...
August 22, 2017: Chemosphere
https://www.readbyqxmd.com/read/28852874/body-mass-and-wing-shape-explain-variability-in-broad-scale-bird-species-distributions-of-migratory-passerines-along-an-ecological-barrier-during-stopover
#14
Jeffrey J Buler, Rebecca J Lyon, Jaclyn A Smolinsky, Theodore J Zenzal, Frank R Moore
Migrating birds are under selective pressure to complete long-distance flights quickly and efficiently. Wing morphology and body mass influence energy expenditure of flight, such that certain characteristics may confer a greater relative advantage when making long crossings over ecological barriers by modifying the flight range or speed. We explored the possibility, among light (mass <50 g) migrating passerines, that species with relatively poorer flight performance related to wing shape and/or body mass have a lower margin for error in dealing with the exigencies of a long water crossing across the Gulf of Mexico and consequently minimize their travel time or distance...
August 29, 2017: Oecologia
https://www.readbyqxmd.com/read/28843847/skin-transcriptomes-of-common-bottlenose-dolphins-tursiops-truncatus-from-the-northern-gulf-of-mexico-and-southeastern-u-s-atlantic-coasts
#15
Marion G Neely, Jeanine S Morey, Paul Anderson, Brian C Balmer, Gina M Ylitalo, Eric S Zolman, Todd R Speakman, Carrie Sinclair, Melannie J Bachman, Kevin Huncik, John Kucklick, Patricia E Rosel, Keith D Mullin, Teri K Rowles, Lori H Schwacke, Frances M Van Dolah
Common bottlenose dolphins serve as sentinels for the health of their coastal environments as they are susceptible to health impacts from anthropogenic inputs through both direct exposure and food web magnification. Remote biopsy samples have been widely used to reveal contaminant burdens in free-ranging bottlenose dolphins, but do not address the health consequences of this exposure. To gain insight into whether remote biopsies can also identify health impacts associated with contaminant burdens, we employed RNA sequencing (RNA-seq) to interrogate the transcriptomes of remote skin biopsies from 116 bottlenose dolphins from the northern Gulf of Mexico and southeastern U...
August 23, 2017: Marine Genomics
https://www.readbyqxmd.com/read/28837674/fleet-behavior-is-responsive-to-a-large-scale-environmental-disturbance-hypoxia-effects-on-the-spatial-dynamics-of-the-northern-gulf-of-mexico-shrimp-fishery
#16
Kevin M Purcell, J Kevin Craig, James M Nance, Martin D Smith, Lori S Bennear
The northwestern Gulf of Mexico shelf experiences one of the largest seasonal hypoxic zones in the western hemisphere. Hypoxia (dissolved oxygen, DO ≤ 2.0 mg·L-1) is most severe from May to August during the height of the Gulf shrimp fishery, but its effects on the fishery are not well known. Prior studies indicate that hypoxia alters the spatial dynamics of shrimp and other species through habitat loss and aggregation in nearby oxygenated refuge habitats. We hypothesized that hypoxia-induced changes in the distribution of shrimp also alter the spatial dynamics of the Gulf shrimp fleet...
2017: PloS One
https://www.readbyqxmd.com/read/28823050/a-scanning-electron-microscopy-study-of-early-development-in-vitro-of-contracaecum-multipapillatum-s-l-nematoda-anisakidae-from-a-brown-pelican-pelecanus-occidentalis-from-the-gulf-of-california-mexico
#17
Dolores Molina-Fernández, Isabel Valles-Vega, Sergio Hernández-Trujillo, Francisco Javier Adroher, Rocío Benítez
Eggs obtained from the uteri of female nematodes, genetically identified as Contracaecum multipapillatum s.l., found in a brown pelican (Pelecanus occidentalis) from Bahía de La Paz, Gulf of California, Mexico, were used to study the early developmental stages of this anisakid by scanning electron microscopy (SEM). Egg dimensions were approximately 54 × 45 μm measured by SEM. Observation of the eggs revealed an outer surface of fibrous appearance. The newly hatched larvae were ensheathed and highly motile...
August 19, 2017: Parasitology Research
https://www.readbyqxmd.com/read/28817569/long-term-assessment-of-whale-shark-population-demography-and-connectivity-using-photo-identification-in-the-western-atlantic-ocean
#18
Jennifer A McKinney, Eric R Hoffmayer, Jason Holmberg, Rachel T Graham, William B Driggers, Rafael de la Parra-Venegas, Beatriz E Galván-Pastoriza, Steve Fox, Simon J Pierce, Alistair D M Dove
The predictable occurrence of whale sharks, Rhincodon typus, has been well documented in several areas. However, information relating to their migratory patterns, residency times and connectivity across broad spatial scales is limited. In the present study photo-identification data is used to describe whale shark population structure and connectivity among known aggregation sites within the Western Central Atlantic Ocean (WCA). From 1999 to 2015, 1,361 individuals were identified from four distinct areas: the Yucatan Peninsula, Mexico (n = 1,115); Honduras (n = 146); northern Gulf of Mexico, United States (n = 112), and Belize (n = 49)...
2017: PloS One
https://www.readbyqxmd.com/read/28798467/acclimation-to-prolonged-hypoxia-alters-hemoglobin-isoform-expression-and-increases-hemoglobin-oxygen-affinity-and-aerobic-performance-in-a-marine-fish
#19
Yihang K Pan, Rasmus Ern, Phillip R Morrison, Colin J Brauner, Andrew J Esbaugh
Hemoglobin (Hb) multiplicity is common in fish, yet despite its ubiquitous nature, the functional significance is unclear. Here we explore the hypothesis that Hb multiplicity plays a role in hypoxia tolerance using the red drum (Sciaenops ocellatus). Red drum is an economically and ecologically important species native to coastal regions and estuaries of the Gulf of Mexico - habitats that routinely experience pronounced hypoxic events. Using a transcriptomic approach, we demonstrate that red drum red blood cells express 7 and 5 Hbα and Hbβ isoforms, respectively...
August 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28792415/early-development-and-life-cycle-of-contracaecum-multipapillatum-s-l-from-a-brown-pelican-pelecanus-occidentalis-in-the-gulf-of-california-mexico
#20
Isabel Valles-Vega, Dolores Molina-Fernández, Rocío Benítez, Sergio Hernández-Trujillo, Francisco Javier Adroher
The initial developmental stages of Contracaecum multipapillatum (von Drasche, 1882) Lucker, 1941 sensu lato were studied using eggs obtained from the uteri of female nematodes (genetically identified) found in a brown pelican Pelecanus occidentalis from Bahía de La Paz (Gulf of California, Mexico). Optical microscopy revealed a smooth or slightly rough surface to the eggs. Egg dimensions were approximately 53 × 43 µm, although after the larvae had developed inside, egg size increased to 66 × 55 µm. Hatching and survival of the larvae were greater at 15°C than at 24°C, and increased salinity resulted in a slight increase in hatching but seemed to reduce survival at 24°C, but not at 15°C...
August 9, 2017: Diseases of Aquatic Organisms
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