Impact of the invasive colonial tunicate Didemnum vexillum on the recruitment of the bay scallop (Argopecten irradians irradians) and implications for recruitment of the sea scallop (Placopecten magellanicus) on Georges Bank

The invasive colonial tunicate Didemnum vexillum has become widespread in New England waters, colonizing large areas of shell-gravel bottom on Georges Bank including commercial sea scallop (Placopecten magellanicus) grounds. Didemnum vexillum colonies are also fouling coastal shellfish aquaculture gear which increases maintenance costs and may affect shellfish growth rates. We hypothesized that D. vexillum will continue to spread and may affect shellfish larval settlement and survival. We conducted a laboratory experiment to assess interactions between larval bay scallops (Argopectin irradians irradians) and D. vexillum. We found that larval bay scallops avoid settling on D. vexillum colonies, possibly deterred by the low pH of the tunicate’s surface tissue. The results of this study suggest that widespread colonization of substrata by D. vexillum could affect scallop recruitment by reducing the area of quality habitats available for settlement. We propose that the bay scallop can serve as a surrogate for the sea scallop in estimating the negative impact D. vexillum could have on the recruitment of sea scallops on Georges Bank.

Morfología comparativa de las células sanguíneas del tiburón nodriza Ginglymostoma cirratum (Bonnaterre, 1788) con diversos peces.

Se llevó a cabo una comparación entre la morfología de las células de la sangre periférica de 9 tiburones nodriza, de una raya americana y 9 peces teleósteos; además, se determinó la fórmula leucocitaria y la cantidad total de eritrocitos y leucocitos/mm 3 de sangre para cada pez estudiado. English Abstract This work is a comparation of the blood cells morphology between 9 nurse sharks, southern stingray and 9 bone fishes, moreover, it was maked a differential leucocytes count, red and white cells counts by blood mm3 for any fish.

Genetic differentiation among Atlantic cod (Gadus morhua) from Browns Bank, Georges Bank, and Nantucket Shoals

This study examines genetic variation at five microsatellite loci and at the vesicle membrane protein locus, pantophysin, of Atlantic cod (Gadus morhua) from Browns Bank, Georges Bank, and Nantucket Shoals. The Nantucket Shoals sample represents the first time cod south of Georges Bank have been genetically evaluated. Heterogeneity of allelic distribution was not observed (P>0.05) between two temporally separated Georges Bank samples indicating potential genetic stability of Georges Bank cod. When Bonferroni corrections (α=0.05, P<0.017) were applied to pairwise measures of population differentiation and estimates of FST, significance was observed between Nantucket Shoals and Georges Bank cod and also between Nantucket Shoals and Browns Bank cod. However, neither significant differentiation nor significant estimates of FST were observed between Georges Bank and the Browns Bank cod. Our research suggests that the cod spawning on Nantucket Shoals are genetically differentiated from cod spawning on Browns Bank and Georges Bank. Managers may wish to consider Nantucket Shoals cod a separate stock for assessment and management purposes in the future.

Opportunistic feeding of longhorn sculpin (Myoxocephalus octodecemspinosus): Are scallop fishery discards an important food subsidy for scavengers on Georges Bank?

There has been much recent interest in the effects of fishing on habitat and non-target species, as well as in protecting certain areas of the seabed from these effects (e.g. Jennings and Kaiser, 1998; Benaka, 1999; Langton and Auster, 1999; Kaiser and de Groot, 2000). As part of an effort to determine the effectiveness of marine closed areas in promoting recovery of commercial species (e.g. haddock, Melanogrammus aegelfinus; sea scallops, Placopecten magellanicus; yellowtail flounder, Limanda ferruginea; cod, Gadus morhua), nontarget species, and habitat, a multidisciplinary research cruise was conducted by the Northeast Fisheries Science Center (NEFSC), National Marine Fisheries Service. The cruise was conducted in closed area II (CA-II) of the eastern portion of Georges Bank during 19–29 June 2000 (Fig. 1). The area has historically produced high landings of scallops but was closed in 1994 principally for groundfish recovery (Fogarty and Murawski, 1998). The southern portion of the area was reopened to scallop fishing from 15 June to 12 November 1999, and again from 15 June to 15 August 2000. While conducting our planned sampling, we observed scallop viscera (the noncalcareous remains from scallops that have been shucked by commercial fishermen at sea) in the stomachs of several fish species at some of these locations, namely little skate (Raja erinacea), winter skate (R. ocellata), red hake (Urophycis chuss), and longhorn sculpin (Myoxocephalus octodecemspinosus). We examined the stomach contents of a known scavenger, the longhorn sculpin, to evaluate and document the extent of this phenomenon.

Recovery of the Gulf of Maine--Georges Bank Atlantic herring (Clupea harengus) complex: perspectives based on bottom trawl survey data

NMFS bottom trawl survey data were used to describe changes in distribution, abundance, and rates of population change occurring in the Gulf of Maine–Georges Bank herring (Clupea harengus) complex during 1963–98. Herring in the region have fully recovered following severe overfishing during the 1960s and 1970s. Three distinct, but seasonally intermingling components from the Gulf of Maine, Nantucket Shoals (Great South Channel area), and Georges Bank appear to compose the herring resource in the region. Distribution ranges contracted as herring biomass declined in the late 1970s and then the range expanded in the 1990s as herring increased. Analysis of research survey data suggest that herring are currently at high levels of abundance and biomass. All three components of the stock complex, including the Georges Bank component, have recovered to pre-1960s abundance. Survey data support the theory that herring recolonized the Georges Bank region in stages from adjacent components during the late 1980s, most likely from herring spawning in the Gulf of Maine.

Effects of gamma radiation on nutritional and microbial quality of Pampus chinensis (Euphrasen 1788)

To evaluate the efficiency of gamma radiation in combination with low temperature Chinese pomfret, Pampus chinensis were preserved by the treatment of different doses of gamma radiation (3, 5 and 8 KGy) at freezing temperature (-20°C) during 90 days of storage period. Quality assessments for fish were carried out at an interval of 15 days during the storage period. Quality assessments were done by organoleptic, chemical (Total Volatile Nitrogen, TVN and Trimethylamine, TMA) and microbiological (Total Bacterial Count, TBC and Total Mould Count, TMC) evaluation. From the analysis of all parameters, maximum shelf-life was observed for irradiated (8 KGy) sample. It remained acceptable up to 75 days and that was the highest duration among 4 types of samples.

Louis-Napoleon Bonaparte: ?hero' or ?grotesque mediocrity'?

Price, Roger. 'Louis-Napoleon Bonaparte: ?hero' or ?grotesque mediocrity'?', In: Marx's Eighteenth Brumaire: (post) modern interpretations (London: Pluto Press, 2002), pp.145-162 RAE2008

The church's mission in the world, by Louis and Andrâe Râetif. Translated from the French by Reginald F. Trevett.

http://www.archive.org/details/churchsmissionin013224mbp

Seasonal release of the egg capsules of Anoplodium parasita Schneider, 1858, intracoelomic turbellarian (Platyhelminthes, Rhabdocoela) symbiotic of the sea cucumber Holothuria tubulosa Gmelin, 1788 (Echinodermata, Holothuroida)

info:eu-repo/semantics/published

SOLOS DE CONCOURS FOR FLUTE AT THE PARTS CONSERVATORY: TWO DECADES-1900s AND 1940s

The topic of this dissertation is the concours pieces for flute at the Paris Conservatory covering two decades. The works are used for exit examination pieces for graduating students at the conservatory. The music is chosen by the director, the professors in the performance area, and a committee of other professors. These pieces still seem to be among the more important pieces known by flutists in the twenty-first century, and they are also frequently used as required audition pieces by conservatories, orchestras, and competitions. I have performed the works used for examination in two decades separated by almost half a century: The pieces from 1900 to 1909 and from 1940-1949, This performance dissertation contains three recital programs, and the recordings of the recitals are filed electronicaIly. I have grouped them according to contrasting styles in three recitals. Works performed are Agrestide (1942) by Eugene Bozza, Andante et Scherzo (1945) by Francois J. Brun, Preude et Scherzo (1908) by Henri Busser, Concertino (1902) by Cecile Chaminade, sixth Solo (1855) by Jules Demersseman (it was on the concours of 1896, dates which are outside the scope of this dissertation), Sonatine (1943) by Henri Dutilleux, Cantabile et Presto (1904) by Georges Enesco, Andante et Scheno (1901) by Louis Ganne, Fantaisie (1920) by Philippe Gaubert, Nocturne et Allegro Scherzando (1906) by Philippe Gaubert, Chant de Linos (1944) by Andre Jolivet, Fantasiestuck (1947) by Henri Martelli, Eglogue (1909) by Jules Mouquet, Concerto in A (1945-1949) by mile Passani, Ballade (1903) by Albert Perhilou, Sonatine (1946) by Pierre Sancan, Andante Pastorale et Scherzettim (1907) by Paul Taffanel, and Concertino in E Major (1945) by Henri Tornasi. Cantabile et Presto was required in both 1904 and 1940, and Andante et Scherzo was required in both 1901 and 1905.

El problema de basilea. El año de Euler: 1707-2007

El pasado 15 de abril se cumplían 300 años del nacimiento de uno de los cuatro matemáticos más geniales de la historia, Leonhard Euler. Para mí, los otros tres, y que cada cual elija su orden, son Arquímedes, Newton y Gauss. Si la calificación la hiciésemos atendiendo a la cantidad de los trabajos de primer orden realizados por cada uno de ellos, sin duda Euler ocuparía el primer lugar. A lo largo de su extensa vida Euler produjo más de ochocientos libros y miles de artículos y trabajos. Sus obras completas Opera Omnia ocupan más de 80 volúmenes. Sin lugar a dudas es el matemático más prolífico de la Historia. Pero, con ser importante la cantidad de trabajos, el aprecio de los matemáticos contemporáneos y posteriores a él se debe más a la riqueza, originalidad, belleza y genial agudeza de su obra que a su volumen.