Aspects of the reproductive biology of two pelagic sharks in the eastern Atlantic Ocean

2020 ◽  
Vol 97 (6) ◽  
pp. 1651-1661 ◽  
Author(s):  
Feng Wu ◽  
Richard Kindong ◽  
Xiaojie Dai ◽  
Ousmane Sarr ◽  
Jiangfeng Zhu ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Reproductive Biology ◽  
Eastern Atlantic Ocean

Reproductive biology of Vinciguerria nimbaria in the equatorial waters of the eastern Atlantic Ocean

2003 ◽  
Vol 62 (5) ◽  
pp. 1116-1136 ◽  
Author(s):  
B. Stequert ◽  
F. Menard ◽  
E. Marchal
Keyword(s):  
Atlantic Ocean ◽  
Reproductive Biology ◽  
Eastern Atlantic Ocean

scholarly journals Mercury in North-Eastern Atlantic Ocean Water

Nature ◽  
1971 ◽  
Vol 232 (5306) ◽  
pp. 112-112 ◽  
Author(s):  
T. M. LEATHERLAND ◽  
J. D. BURTON ◽  
M. J. MCCARTNEY ◽  
F. CULKIN
Keyword(s):  
Atlantic Ocean ◽  
Ocean Water ◽  
Eastern Atlantic Ocean ◽  
North Eastern

scholarly journals Biogeochemical controls on the bacterial populations in the eastern Atlantic Ocean

2011 ◽  
Vol 8 (12) ◽  
pp. 3747-3759 ◽  
Author(s):  
S. B. Neogi ◽  
B. P. Koch ◽  
P. Schmitt-Kopplin ◽  
C. Pohl ◽  
G. Kattner ◽  
...  
Keyword(s):  
Surface Layer ◽  
Atlantic Ocean ◽  
Chlorophyll A ◽  
Bacterial Abundance ◽  
Aquatic Organisms ◽  
Bacterial Populations ◽  
Organic C ◽  
Cultivable Bacteria ◽  
Eastern Atlantic Ocean ◽  
Vibrio Spp

Abstract. Little is known about bacterial dynamics in the oligotrophic ocean, particularly about cultivable bacteria. We examined the abundance of total and cultivable bacteria in relation to changes in biogeochemical conditions in the eastern Atlantic Ocean with special regard to Vibrio spp., a group of bacteria that can cause diseases in human and aquatic organisms. Surface, deep water and plankton (<20 μm, 20–55 μm and >55 μm) samples were collected between 50° N and 24° S. Chlorophyll-a was very low (<0.3 μg l−1) in most areas of the nutrient-poor Atlantic, except at a few locations near upwelling regions. In surface water, dissolved organic carbon (DOC) and nitrogen (DON) concentrations were 64–95 μM C and 2–10 μM N accounting for ≥90 % and ≥76 % of total organic C and N, respectively. DOC and DON gradually decreased to ~45 μM C and <5 μM N in the bottom water. In the surface layer, culture independent total bacteria and other prokaryotes represented by 4´-6-diamidino-2-phenylindole (DAPI) counts, ranged mostly between 107 and 108 cells l−1, while cultivable bacterial counts (CBC) and Vibrio spp. were found at concentrations of 104–107 and 102–105 colony forming units (CFU) l−1, respectively. Most bacteria (>99 %) were found in the nanoplankton fraction (<20 μm), however, bacterial abundance did not correlate with suspended particulates (chlorophyll-a, particulate organic C [POC] and N [PON]). Instead, we found a highly significant correlation between bacterial abundance and temperature (p < 0.001) and a significant correlation with DOC and DON (p < 0.005 and <0.01, respectively). In comparison to CBC and DAPI-stained prokaryotes, cultivable Vibrio showed a stronger and highly significant correlation with DOC and DON (p < 0.0005 and p < 0.005, respectively). In cold waters of the mesopelagic and abyssal zones, CBC was 50 to 100-times lower than in the surface layer; however, cultivable Vibrio spp. could be isolated from the bathypelagic zone and even near the seafloor (average ~10 CFU l−1). The depth-wise decrease in CBC and Vibrio coincided with the decrease in both DOC and POC. Our study indicates that Vibrio and other bacteria may largely depend on dissolved organic matter to survive in nutrient-poor oceanic habitats.

scholarly journals New records of benthic marine algae from Morocco (eastern Atlantic Ocean): morphology, taxonomy and distribution

2018 ◽  
Vol 43 ◽  
pp. 111-116
Author(s):  
Mustapha Hassoun ◽  
Hanaa Moussa ◽  
Ghizlane Salhi ◽  
Hanaa Zbakh ◽  
Hassane Riadi ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
New Record ◽  
Pacific Islands ◽  
New Records ◽  
Atlantic Coast ◽  
Marine Macroalgae ◽  
Eastern Coast ◽  
Western Coast ◽  
Eastern Atlantic Ocean ◽  
First Time

AbstractWe report new records and corological data for three Moroccan marine macroalgae that complete their distribution information. Radicilingua thysanorhizans is new record for Morocco; Champia compressa is recorded for the first time from the eastern coast of the Atlantic Ocean. Diplothamnion jolyi is widely distributed in the western coast of the Atlantic coast and Pacific Islands, and recently reported from the Mediterranean Sea; this new record from Moroccan Atlantic coast extends their distribution range.Key words: Algae, Atlantic Ocean, Champia compressa, Diplothamnion jolyi, Radicilingua thysanorhizans.ResumenSe aportan nuevos registros y datos corológicos para tres macroalgas marinas de Marruecos, que completan la información sobre su distribución. Radicilingua thysanorhizans es cita nueva para Marruecos. Champia compressa se registra por la primera vez en la costa oriental del Océano Atlántico. Diplothamnion jolyi se distribuye ampliamente en la costa occidental de la costa atlántica y las islas del Pacífico y ha sido recientemente citada en el mar Mediterráneo; esta nueva cita para costa Atlántica Marroquí amplia su rango de distribución.Palabras clave: Algae, Océano Atlántico, Champia compressa, Diplothamnion jolyi, Radicilingua thysanorhizans.

scholarly journals Environmental gradients and physical barriers drive the basin‐wide spatial structuring of Mediterranean Sea and adjacent eastern Atlantic Ocean prokaryotic communities

2021 ◽  
Author(s):  
Marta Sebastián ◽  
Eva Ortega‐Retuerta ◽  
Laura Gómez‐Consarnau ◽  
Marina Zamanillo ◽  
Marta Álvarez ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Mediterranean Sea ◽  
Environmental Gradients ◽  
Eastern Atlantic Ocean ◽  
Spatial Structuring ◽  
Physical Barriers

AGE AND GROWTH OF THE BLUE SHARK PRIONACE GLAUCA IN THE EASTERN ATLANTIC OCEAN

KSTU News ◽  
2021 ◽  
pp. 11-25
Author(s):  
Beraki Weldegiorgish Teklekhaimanot ◽  
Sergey Vadimovich Shibaev ◽  
Sergey Yurievich Gulyugin
Keyword(s):  
Atlantic Ocean ◽  
Growth Parameters ◽  
Growth Function ◽  
Age And Growth ◽  
Growth Band ◽  
Prionace Glauca ◽  
Western Africa ◽  
Eastern Atlantic Ocean ◽  
Digital Microscope ◽  
Central Atlantic

In this study, 292 blue sharks Prionace glauca (Linnaeus, 1758) (from 151 to 305 cm total length, TL) were collected off western Africa in the eastern central Atlantic Ocean between 1980 and 1982. Vertebral sections of females specimens ranged from 175 to 300 cm and males specimens ranged from 166 to 312 cm TL were processed and analyzed for age and growth parameters. Growth band pairs (translucent and opaque bands) were counted on the images photographed from the stained whole vertebrae using digital microscope called Digi Scope II. The band pairs after the birthmark were counted from 3 to 12 for males and from 4 to 13 for females. Growth parameters were derived using the Von Bertalanffy growth function (VBGF) based on FISAT and solver solution Microsoft excel and Ford Wall-Ford. VBGF was that which best fit the data. Parameters derived from the combination of observed and back-calculated lengths, K = 0.1, L_∞ = 386.4 cm and t_0 = −1.35 year for males and K = 0.12 year -1, L_∞= 355 cm and t_0 = –1.02 year for females were considered to best describe growth. The longevity was estimated to be at least 23.7 and 28.3 years for females and males respectively. The natural mortality rate was estimated to be 0.15 year - 1 and 0.18 year -1 for males and females respectively.

Crinoidea and Holothuroidea (Echinodermata) of the abyssal Angola Basin—Results of the DIVA-1 expedition of FS "Meteor" (Cruise M48/1)

Zootaxa ◽  
2006 ◽  
Vol 1276 (1) ◽  
pp. 1 ◽  
Author(s):  
JENS MICHAEL BOHN
Keyword(s):  
Atlantic Ocean ◽  
Rich Variety ◽  
South Eastern ◽  
Epibenthic Sledge ◽  
Eastern Atlantic Ocean ◽  
Agassiz Trawl

Agassiz trawl and epibenthic sledge samples taken at abyssal depths in the Angola Basin (south-eastern Atlantic Ocean) during the expedition DIVA-1 with FS "Meteor" in July 2000 yielded a rich variety of Echinodermata: inter alia one stalked crinoid (Bathycrinus cf. aldrichianus Wyville Thomson, 1876) and altogether nine holothurian species, two of which are subspecies. One of these, Achlyonice longicornis spec. nov., is new to science, while all others have been described earlier: Deima validum validum Théel, 1879, Psychropotes semperiana Théel, 1882, Peniagone purpurea (Théel, 1882), Molpadiodemas atlanticus (R. Perrier, 1898), Molpadia liska Pawson, 1977, Protankyra brychia (Verrill, 1885), Siniotrochus myriodontus Gage & Billett, 1986 and Neolepidotrochus parvidiscus angolensis Bohn, 2005. All species collected are described and their known distributions are given. Finally, two crinoids and 21 holothurian species, so far known from the abyssal Angola Basin, are listed and their zoogeographical relationships are discussed.

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