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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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