Diurnal feeding rhythms in north sea copepods measured by Gut fluorescence, digestive enzyme activity and grazing on labelled food

Baars, M.A.; Oosterhuis, S.

doi:10.1016/0077-7579(84)90027-9

Cited by 102 publications

(54 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The observed feeding rhythm was consistent with studies that describe circadian feeding rhythms in several species (i.e. Mackas and Bohrer, 1976;Baars and Oosterhuis, 1984;Durbin et al, 1990;Castro et al, 1991;Checkley et al, 1992;Cervetto et al, 1993), and also agrees with the persistence of circadian feeding rhythms in copepods under non limiting food supply or constant illumination (Petipa, 1958fide Stearns, 1986Mayzaud et al, 1984;Stearns, 1986;Dagg et al, 1989).…”

Section: Resultssupporting

confidence: 90%

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

Calliari¹,

Antezana²

2001

Sci. Mar.

View full text Add to dashboard Cite

SUMMARY: The feeding behaviour of the size fractionated copepod assemblage was studied over a diel cycle in Coliumo Bay. In this shallow environment the photic layer reached the bottom and salinity, temperature, and food availability were fairly homogeneous throughout the water column. All four size-fractions (250-500 µm, 500-1000 µm, 1000-2000 µm, >2000 µm) showed a period of high feeding activity during the night and low feeding activity during the day. The persistence of nocturnal feeding in the presence of high food concentration over the 24-h cycle is interpreted as a predator avoidance strategy: empty guts by day make copepods less conspicuous to their visual daytime predators.

show abstract

Section: Resultssupporting

confidence: 90%

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

Calliari¹,

Antezana²

2001

Sci. Mar.

View full text Add to dashboard Cite

show abstract

“…Differences in gut content with depth have also been reported (Baars & Oosterhuis 1984, Head et al 1984, Dam 1989. Our study was not designed to study either diel or spatial (depth-related) changes in feeding behavior.…”

Section: Discussionmentioning

confidence: 90%

“…Previous studies on feeding behavior of Temora longicomis have shown the existence of diel cycles, with gut content generally maximum at night (Baars & Oosterhuis 1984, Head et al 1984, Ki~rboe et al 1985, Dam 1986, Tiselius 1988. Differences in gut content with depth have also been reported (Baars & Oosterhuis 1984, Head et al 1984, Dam 1989.…”

Section: Discussionmentioning

confidence: 93%

In situ feeding behavior of the copepod Temora longicornis: effects of seasonal changes in chlorophyll size fractions and female size

Dam¹,

Peterson²

1991

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

We estimated in situ ingestion rates of females of the calanoid copepod Temora longicornis in Long Island Sound, New York, USA, at roughly weekly intervals, between February and August from 1985 to 1987 using the gut fluorescence technique. Variability in gut pigment content (GPC) and ~ngestion rates (IR) was examined in relation to changes in the concentration of total chlorophyll and of chlorophyll in the > 20 vm size fractions, and changes in body size. Correlations of GPC and IR with chlorophyll concentration were highest for the > 20 Km size fraction and lowest for total chlorophyll. Saturation of GPC and IR was apparent only when phytoplankton > 10 pm or > 20 pm was considered as available food. These results lend support to the notion that the degree to which herbivorous coastal copepods are food-limited may be strongly dependent on the structure of the phytoplankton assemblage Prosome length of female T long~corn~s decreased by almost a factor of 2, and dry weight by a factor of 4, from February to August Correlations between weight-specific GPC, welght-specific IR and chlorophyll concentration in all size fractions were poorer than in the cases of GPC and IR on a per mdlvidual basis However, a multivariate regression analysis indicated that most of the vanance in GPC and IR was explained by the different size fractions of chlorophyll, not body weight. Therefore, the use of weight-specific indices may not always be justified even when variation in body size is pronounced. We suggest that multivanate analysis or other statistical techniques b e employed, instead of weightspecific indices, when body size may be a confounding vanable.

show abstract

“…The second possible explanation is that the fluorometer on board the REMUS AUV was detecting fluorescence from the zooplankton guts. Zooplankton gut fluor escence has been a standard measurement for quantifying ingestion, grazing, growth, and fecundity in copepods and gelatinous zooplankton in both lab and field settings (Mackas and Bohrer, 1976;Baars and Oosterhuis, 1984;Dam et al, 1994;Pasternak, 1994;Atkinson et al, 1996;Landry et al, 1997;Harris et al, 2000). Jaffe et al (1998) and Jaffe (2001, 2008) simultaneously imaged phytoplankton and zooplankton using a fluorescence-imaging system and identified fluorescing zooplank ton guts in situ.…”

Section: Planktonic Interactionmentioning

confidence: 99%

Bioluminescence to reveal structure and interaction of coastal planktonic communities

Moline

Blackwell

Case

et al. 2009

Deep Sea Research Part II: Topical Studies in Oceanography

View full text Add to dashboard Cite

a b s t r a c tEcosystem function will in large part be determined by functional groups present in biological communities. The simplest distinction with respect to functional groups of an ecosystem is the differentiation between primary and secondary producers. A challenge thus far has been to examine these groups simultaneously with sufficient temporal and spatial resolution for observations to be relevant to the scales of change in coastal oceans. This study takes advantage of general differences in the bioluminescence flash kinetics between planktonic dinoflagellates and zooplankton to measure relative abundances of the two groups within the same-time space volume. This novel approach for distinguishing these general classifications using a single sensor is validated using fluorescence data and exclusion experiments. The approach is then applied to data collected from an autonomous underwater vehicle surveying 4500 km in Monterey Bay and San Luis Obispo Bay, CA during the summers of [2002][2003][2004]. The approach also reveals that identifying trophic interaction between the two planktonic communities may also be possible.

show abstract

Diurnal feeding rhythms in north sea copepods measured by Gut fluorescence, digestive enzyme activity and grazing on labelled food

Cited by 102 publications

References 41 publications

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

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

In situ feeding behavior of the copepod Temora longicornis: effects of seasonal changes in chlorophyll size fractions and female size

Bioluminescence to reveal structure and interaction of coastal planktonic communities

Contact Info

Product

Resources

About