Gut contents and diel feeding rhythm in dominant copepods in the ice-covered Weddell Sea, March 1992

Polar Biology ◽  
1995 ◽  
Vol 15 (8) ◽  
Author(s):  
AnnaF. Pasternak
Keyword(s):  
Weddell Sea ◽  
Gut Contents ◽  
Feeding Rhythm ◽  
Diel Feeding Rhythm

Feeding and gut contents inCephalodiscus nigrescens(Hemichordata, Pterobranchia) from the Weddell Sea

1993 ◽  
Vol 230 (1) ◽  
pp. 63-67 ◽  
Author(s):  
P. N. Dilly
Keyword(s):  
Weddell Sea ◽  
Gut Contents

scholarly journals Molecular analyses of gut contents: elucidating the feeding of co-occurring salps in the Lazarev Sea from a different perspective

2014 ◽  
Vol 26 (5) ◽  
pp. 545-553 ◽  
Author(s):  
Katja Metfies ◽  
Anja Nicolaus ◽  
Lena Von Harbou ◽  
Ulrich Bathmann ◽  
Ilka Peeken
Keyword(s):  
454 Pyrosequencing ◽  
Sampling Site ◽  
Intergenic Spacer ◽  
Weddell Sea ◽  
Gut Contents ◽  
Selective Feeding ◽  
Gut Content ◽  
Molecular Analyses ◽  
Dominant Component ◽  
Ribosomal Intergenic Spacer

AbstractThe diet of Antarctic salps was elucidated by investigating their gut content using automated ribosomal intergenic spacer analysis (ARISA) and 454-pyrosequencing. Salp samples were collected during the Lazarev Sea Krill Study in the western Weddell Sea (summer 2005–06 and 2007–08, autumn 2004 and winter 2006). Two salp species,Salpa thompsoniandIhlea racovitzai, both occur in the Southern Ocean and can overlap geographically and seasonally. We provide evidence that, despite the non-selective feeding mechanism, the two co-occurring salp species might have different niches within a habitat. ARISA-patterns of 93 gut content samples revealed strong differences between the two salp species, even at the same sampling site. These differences were confirmed by 454-pyrosequencing of the V4-18S rDNA of ten salps. The pyrosequencing data indicate that flagellates, in particular dinophyceae, constitute a high proportion of the sequence reads identified in the gut content of both salp species. However, within the dinophyceae, differences in the read composition were detected between the two salp species. This supports the findings of a previous study where fatty acid signatures indicate a flagellate-based diet, even though microscopic analyses identified diatoms as the dominant component of salp gut contents.

Vertical distribution and feeding of Thalia democratica on the Agulhas Bank during march 1994

1997 ◽  
Vol 77 (2) ◽  
pp. 493-505 ◽  
Author(s):  
M.J. Gibbons
Keyword(s):  
South Africa ◽  
Vertical Distribution ◽  
Diel Vertical Migration ◽  
Passage Time ◽  
Pigment Content ◽  
Grazing Impact ◽  
Phytoplankton Productivity ◽  
Feeding Rhythm ◽  
Diel Feeding Rhythm

Diel vertical migration (DVM) and in situ feeding of Thalia democratica (Tunicata: Thaliacea) was studied in the field (Agulhas Bank, South Africa) over a 48 h period in March 1994. Thalia democratica did not display DVM, and both aggregates and solitaires were mostly confined to the upper layers of the water column throughout the study period. Thalia democratica did not display any discernible diel feeding rhythm, and pigment content increased with salp size. Individuals with greatest pigment content were found at the chlorophyll maximum. Estimates of grazing impact varied with salp abundance and gut passage time, ranging from less than 1% to greater than 100% of phytoplankton productivity.

The diel feeding rhythm of the freshwater crabTrichodactylus borellianus(Decapoda: Brachyura) in mesocosm and natural conditions

2013 ◽  
Vol 46 (2) ◽  
pp. 89-104 ◽  
Author(s):  
Débora de Azevedo Carvalho ◽  
Pablo Agustín Collins ◽  
Cristian Javier De Bonis
Keyword(s):  
Natural Conditions ◽  
Feeding Rhythm ◽  
Diel Feeding Rhythm

scholarly journals Diel Feeding Rhythm and Grazing Selectivity of Small-Sized Copepods in a Subtropical Embayment, the Northern South China Sea

2021 ◽  
Vol 8 ◽  
Author(s):  
Xuejia He ◽  
Ziyu Wang ◽  
Ziqing Bai ◽  
Liuyu Han ◽  
Mianrun Chen
Keyword(s):  
Ingestion Rate ◽  
Northern South China Sea ◽  
Standing Stock ◽  
Feeding Preference ◽  
Daya Bay ◽  
Pigment Analysis ◽  
Feeding Rhythm ◽  
Feeding Rhythms ◽  
Gut Pigment ◽  
Diel Feeding Rhythm

Small marine copepods are key components of the pelagic food webs in Chinese coastal waters, but very few studies have addressed their trophodynamics, with even fewer studies addressing their diel feeding rhythms. In this study, the diel feeding rhythm and grazing selectivity of the copepod assemblage in Daya Bay during September 30 to October 2, 2014, were studied based on gut pigment analysis. Small copepods (body length < 1.5 mm) including Paracalanus parvus, Temora turbinata, Acrocalanus gibber, Temora stylifera, Euterpe acutifrons, and Acrocalanus gracilis, accounted for 73.9–100% of the total copepod abundance. The copepod assemblage generally exhibited a diurnal feeding pattern, characterized by a higher gut pigment content and ingestion rate during the daytime, consistent with variation in the ambient Chl α concentration. Fifty-five percent of the phytoplankton standing stock per day was consumed by the copepod assemblage, wherein diatoms, prymnesiophytes, and cyanobacteria were the main prey items with average contributions of 19.4–32.9% to the gut pigment contents. The copepod assemblage showed a strong feeding preference for prymnesiophytes, a weak feeding preference for diatoms, and avoidance of cyanobacteria. These results suggest a strong top-down control on phytoplankton community, especially on small groups from small copepods in the Daya Bay ecosystem.

scholarly journals Diel feeding rhythm of copepod size-fractions from Coliumo Bay, Central Chile

2001 ◽  
Vol 65 (4) ◽  
pp. 269-274 ◽  
Author(s):  
Danilo Calliari ◽  
Tarsicio Antezana
Keyword(s):  
Central Chile ◽  
Size Fractions ◽  
Feeding Rhythm ◽  
Diel Feeding Rhythm
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