Consulta: subjectFacets:"Diel vertical migration"
Registros recuperados: 8
Data/hora: 02/06/2024 07:05:13

Diel changes in acoustic and catch estimates of krill biomass
Provedor de dados: 5
Autores: Simard, Yvan; Sourisseau, Marc.
Krill-biomass estimates can be compromised by diel variabilities in acoustic backscatter and the catch efficiencies of various nets. This paper describes an effort to quantify these variabilities at fine temporal and spatial scales during a three-day experiment at a fixed location, using high-resolution, stratified Bioness samples and echo-integration, and assuming a fixed distribution of krill orientations. Night-time catches in the krill scattering layer (SL) were 15 times the acoustic estimates. The situation was reversed during daytime, when the acoustic estimates in the SL were 5 times larger than the catches. This collectively resulted in a ±10-dB gradual diel cycle in the difference of vertically integrated biomass from both sampling methods. Use of...
Tipo: Text
Palavras-chave: Thysanoessa raschi; Target strength; Strobe light; St Lawrence Estuary; Meganyctiphanes norvegica; Krill; In situ orientation; Feeding; Diel vertical migration; Avoidance.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6591.pdf

Novel use of pop‑up satellite archival telemetry in sawsharks: insights into the movement of the common sawshark Pristiophorus cirratus (Pristiophoridae)
Provedor de dados: 5
Autores: Burke, Patrick J; Mourier, Johann; Gaston, Troy F; Williamson, Jane E.
Background Understanding movement patterns of a species is vital for optimising conservation and management strategies. This information is often difficult to obtain in the marine realm for species that regularly occur at depth. The common sawshark (Pristiophorus cirratus) is a small, benthic associated elasmobranch species that occurs from shallow to deep-sea environments. No information is known regarding its movement ecology. Despite this, P. cirrata are still regularly landed as nontargeted catch in the south eastern Australian trawl fisheries. Three individuals were tagged with pop-up satellite archival tags (PSATs) off the coast of Tasmania, Australia, to test the viability of satellite tagging on these small elasmobranchs and to provide novel...
Tipo: Text
Palavras-chave: Elasmobranch; Satellite telemetry; Diel vertical migration; Tagging; Pristiophoridae; Australia; Movement.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00632/74399/74101.pdf

Detecting mesopelagic organisms using biogeochemical‐Argo floats
Provedor de dados: 5
Autores: Haëntjens, Nils; Della Penna, Alice; Briggs, Nathan; Karp‐boss, Lee; Gaube, Peter; Claustre, Hervé; Boss, Emmanuel.
During the North Atlantic Aerosols and Ecosystems Study (NAAMES) in the western North Atlantic (NAAMES), float‐based profiles of fluorescent dissolved organic matter (FDOM) and backscattering exhibited distinct spike layers at ~300 m. The locations of the spikes were at depths similar or shallower to where a ship‐based scientific echo sounder identified layers of acoustic backscatter, an Underwater Vision Profiler (UVP) detected elevated concentration of zooplankton, and mesopelagic fish were sampled by a mesopelagic net tow. The collocation of spike layers in bio‐optical properties with mesopelagic organisms suggests that some can be detected with float‐based bio‐optical sensors. This opens the door to the investigation of such aggregations/layers in...
Tipo: Text
Palavras-chave: BGC-Argo; Diel vertical migration; Mesopelagic organism; Scattering layers.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00609/72121/70869.pdf

Distribution of Pelagia noctiluca (Cnidaria, Scyphozoa) in the Ligurian Sea (NW Mediterranean Sea)
Provedor de dados: 5
Autores: Ferraris, M.; Berline, Leo; Lombard, F.; Guidi, L.; Elineau, A.; Mendoza-vera, J. M.; Lilley, M. K. S.; Taillandier, V.; Gorsky, G.
The scyphozoan Pelagia noctiluca reproduces by direct development without a benthic stage. Typically, this jellyfish is found offshore with a holoplanktonic lifecycle, vertical migration and feeding behaviours. Frequent outbreaks have been well documented on the Mediterranean shores since the 19th century; however, the offshore distribution of this species remains mostly unknown. In this study, we performed a bimonthly monitoring of P. noctiluca surface density, at high resolution, from a sailboat, along a 35-km coastal to offshore transect in the Ligurian Sea, between February and October 2011. During daylight, P. noctiluca was rarely seen. At night, offshore, P. noctiluca was always present, while within 5 km of the coast, P. noctiluca was rarely...
Tipo: Text
Palavras-chave: Jellyfish; Diel vertical migration; Mauve stinger; Blooms; Gelatinous zooplankton; Surface observations; Glider.
Ano: 2012
URL: https://archimer.ifremer.fr/doc/00192/30285/28761.pdf

Modelling for anchovy recruitment studies in the Gulf of Lions (Western Mediterranean Sea)
Provedor de dados: 5
Autores: Nicolle, Amandine; Garreau, Pierre; Liorzou, Bernard.
Anchovy (Engraulis encrasicolus) is an important commercial species and one of the most abundant pelagic fish in the Gulf of Lions and the Catalan Sea. The factors influencing its recruitment are crucial to fisheries and ecological research. Among those factors transport of larvae by hydrodynamics (currents) is important because it determines whether the organisms can reach areas favourable to recruitment or are dispersed. Therefore, the first step in anchovy recruitment modelling is to simulate North-western Mediterranean Sea circulation. Several years (2001-2008) of hydrodynamics were simulated with the MARS-3D code. The resulting simulated currents and salinity are used by Lagrangian tool, Ichthyop, to transport anchovy eggs and larvae to the Western...
Tipo: Text
Palavras-chave: Diel vertical migration; Lagrangian transport; Gulf of Lions; Numerical model; Mediterranean Sea; Anchovy.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-7394.pdf

Feeding of diving predators and diel vertical migration of prey: King penguins' diet versus trawl sampling at Kerguelen Islands
Provedor de dados: 5
Autores: Bost, Charles-andré; Zorn, T; Le Maho, Yvon; Duhamel, Guy.
The diving behavior and diet composition of King penguins were examined during summer 1995 at Kerguelen Islands. This was in relation to real-time estimations of diel prey availability during 2 sampling sessions totaling 10 d at sea. During daylight hours King penguins performed medium to deep dives of 120-250 m. At night, they dived no deeper than 60 m. Daytime, dusk and night-time sampling of prey was performed in the depth ranges corresponding to the depths of the penguins' dives in this study. The diversity in mesopelagic fish was found to be highest during the night at 0-50 m (15 vs 9 species during the day), and their number was up to 20-fold higher at these depths at night than during the day at the 150-250 m depth layer. The 3 myctophid species...
Tipo: Text
Palavras-chave: King penguins; Diet; Diel vertical migration; Myctophids; Foraging behavior.
Ano: 2002
URL: https://archimer.ifremer.fr/doc/00247/35842/34355.pdf

Biogeography of Micronekton Assemblages in the Natural Park of the Coral Sea
Provedor de dados: 5
Autores: Receveur, Aurore; Vourey, Elodie; Lebourges-dhaussy, Anne; Menkes, Christophe; Menard, Frederic; Allain, Valerie.
Mesopelagic resources are central to the ecosystem but remain poorly studied mainly due to the lack of observations. This paper investigates the assemblages of micronekton organisms and their habitat in the Natural Park of the Coral Sea around New Caledonia (southwest Pacific) using data from 141 pelagic trawls. A total of 67,130 micronekton individuals (fish, crustaceans, and mollusks) were collected with 252 species identified among 152 genus and 76 families. In the analyses, we focused on 22 species; each were present in more than 33 trawls (i.e., in more than 25% of the total number of trawls) and studied their spatial distribution and vertical dynamic behavior. Community structure was investigated through region of common profile (RCP), an innovative...
Tipo: Text
Palavras-chave: Diversity; Southwest Pacific Ocean; Mesopelagic zone; Region of common profile; Diel vertical migration; Pelagic trawl.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00644/75563/76480.pdf

Depth-selection patterns and diel vertical migration of Daphnia ambigua (Crustacea: Cladocera) in lake El Plateado
Provedor de dados: 97
Autores: RAMOS-JILIBERTO,RODRIGO; ZÚÑIGA,LUIS R.
Eutrophic temperate and sub-tropical lakes often exhibit a marked vertical structure during the warm season that involves important spatial differences of physical, chemical and biological variables. Therefore, zooplankton is exposed to a highly heterogeneous environment in the vertical dimension. In this work, We analyze the depth-distribution of the cladoceran Daphnia ambigua in the eutrophic, monomictic lake El Plateado at midday and midnight, along with its relationship with the vertical distribution of water temperature and dissolved oxygen concentration. We also attempt to define whether or not this population exhibits a diel vertical migration. The results show significant changes in the day/night vertical distribution of D. ambigua during its...
Tipo: Journal article
Palavras-chave: Chile; Daphnia; Depth-selection; Diel vertical migration; Zooplankton.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000300007