The Food of Some Freshwater Cyclopoid Copepods and its Ecological Significance

Fryer, Geoffrey

doi:10.2307/1747

Cited by 242 publications

(143 citation statements)

References 16 publications

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“…However, Meili et al (1996) also attributed the difference between the ␦ 15 N of the two grazers to separate primary food sources rather than to a trophic interaction. Further elevation of ␦ 15 N in C. abyssorum from Loch Ness was consistent with the omnivorous nature of this species and its predatory relationship with E. gracilis (Fryer 1957). Because the ␦ 15 N of B. longimanus was constantly above TL3 during the summer, copepods may then have been contributing a small proportion to a diet primarily of daphnids, although in experiments to examine the effect of Bythotrephes on zooplankton densities, neither cyclopoid nor calanoid copepod biomass was depleted (Wahlström and Westman 1999).…”

Section: Discussionsupporting

confidence: 60%

“…Thus, there was also likely to be an element of recycling of zooplankton exuviae and excreta. A further potentially confusing factor arises from the simultaneous presence of differing life stages of the same organism, because naupliar, copepodite, and adult stages can exhibit different feeding strategies at a microscale (Fryer 1998). Kankaala (1988) deduced from in situ grazing experiments that while algae are the principal food of adult Daphnia longispina in small humic lakes, bacterial productivity was important to the juveniles.…”

Section: Discussionmentioning

confidence: 99%

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Seasonal changes in the importance of the source of organic matter to the diet of zooplankton in Loch Ness, as indicated by stable isotope analysis

Grey

Jones

Sleep³

2001

Limnology & Oceanography

301

303

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Seasonal variations in the stable isotope composition (␦ 13 C and ␦ 15 N) of crustacean zooplankton and their putative food sources in oligotrophic Loch Ness were recorded during 1998. Bulk particulate organic matter (POM) showed ␦ 13 C values consistent with a terrestrial plant origin from the catchment and exhibited little seasonal variation, whereas POM ␦ 15 N was more variable, probably due to associated microbial action. In contrast, phytoplankton ␦ 13 C was relatively light and showed some seasonal variation, but ␦ 15 N values were more constant. The isotopic signatures of both POM and phytoplankton remained sufficiently distinct from each other throughout the period of study to allow their relative contributions to zooplankton diet to be assessed. Zooplankton isotopic signatures shifted seasonally, reflecting a dietary switch from a reliance on allochthonous carbon derived from POM during winter and early spring to heavy dependence on algal production during summer. Annually, crustacean zooplankton in Loch Ness derive approximately 40% of their body carbon from allochthonous sources, likely mediated via microbial links. Separate determination of isotope ratios for the main zooplankton species allowed a more detailed trophic investigation. The most abundant zooplankton species in the loch, Eudiaptomus gracilis, incorporated appreciable allochthonous carbon even during the peak of phytoplankton productivity. By contrast, Daphnia hyalina grew mainly in late summer and autumn and derived almost 100% body carbon from algal sources. This study is the first to quantify such a seasonal switch in zooplankton dependence between allochthonous and autochthonous sources of organic matter in a large lake.The ecological importance of terrestrially derived material to lake food webs is receiving increasing attention. Much of the impetus for this has come from studies of the dark stained waters of small, boreal forest lakes of Scandinavia resulting from humic matter originating in the catchment (Meili 1992). The staining restricts light penetration into the water column and presents an unfavorable environment for photosynthetic fixation of carbon in situ by autotrophic phytoplankton (Jones 1992). Thus, in these systems, autochthonous production is usually very low. Humic material is capable of supporting bacterial metabolism (Hessen 1992) and associated heterotrophic organisms in the microbial loop (Tranvik 1992); consequently, a significant contribution to the humic lake food web may be derived from allochthonous matter via detritus-driven food chains. Jones (1992) hypothesized that the relative importance of allochthonous organic matter to the pelagic food web of lakes should increase with decreasing lake trophy, and a survey of the balance between planktonic production : respiration ratios lent support to this hypothesis (del Giorgio andPeters 1993, 1994). In oligotrophic lakes where community respiration equals or exceeds phytoplankton production (del Giorgio et al. 1997), the heterotrophic plankton must recei...

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Section: Discussionsupporting

confidence: 60%

Section: Discussionmentioning

confidence: 99%

Seasonal changes in the importance of the source of organic matter to the diet of zooplankton in Loch Ness, as indicated by stable isotope analysis

Grey

Jones

Sleep³

2001

Limnology & Oceanography

301

303

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“…1 Predacious cyclopoids are particularly effective at eliminating newly emerged Aedes larvae from large water-storage containers and wells, and because of their broad diet, consisting of algae, protozoa, and rotifers, they do not depend on a continuous supply of mosquito larvae to maintain their numbers. 2,3 In addition, in Vietnam, the corixid bug Micronecta quadristrigata Bredd. and fish also contribute to the control of Aedes larvae.…”

Section: Introductionmentioning

confidence: 99%

Control of aedes vectors of dengue in three provinces of Vietnam by use of Mesocyclops (Copepoda) and community-based methods validated by entomologic, clinical, and serological surveillance.

Kay¹,

Nam²,

Tien³

et al. 2002

The American Journal of Tropical Medicine and Hygiene

124

125

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Abstract. We describe remarkable success in controlling dengue vectors, Aedes aegypti (L.) and Aedes albopictus (Skuse), in 6 communes with 11,675 households and 49,647 people in the northern provinces of Haiphong, Hung Yen, and Nam Dinh in Vietnam. The communes were selected for high-frequency use of large outdoor concrete tanks and wells. These were found to be the source of 49.6-98.4% of Ae. aegypti larvae, which were amenable to treatment with local Mesocyclops, mainly M. woutersi Van der Velde, M. aspericornis (Daday) and M. thermocyclopoides Harada. Knowledge, attitude, and practice surveys were performed to determine whether the communities viewed dengue and dengue hemorrhagic fever as a serious health threat; to determine their knowledge of the etiology, attitudes, and practices regarding control methods including Mesocyclops; and to determine their receptivity to various information methods. On the basis of the knowledge, attitude, and practice data, the community-based dengue control program comprised a system of local leaders, health volunteer teachers, and schoolchildren, supported by health professionals. Recycling of discards for economic gain was enhanced, where appropriate, and this, plus 37 clean-up campaigns, removed small containers unsuitable for Mesocyclops treatment. A previously successful eradication at Phan Boi village (Hung Yen province) was extended to 7 other villages forming Di Su commune (1,750 households) in the current study. Complete control was also achieved in Nghia Hiep (Hung Yen province) and in Xuan Phong (Nam Dinh province); control efficacy was Ն 99.7% in the other 3 communes (Lac Vien in Haiphong, Nghia Dong, and Xuan Kien in Nam Dinh). Although tanks and wells were the key container types of Ae. aegypti productivity, discarded materials were the source of 51% of the standing crop of Ae. albopictus. Aedes albopictus larvae were eliminated from the 3 Nam Dinh communes, and 86-98% control was achieved in the other 3 communes. Variable dengue attack rates made the clinical and serological comparison of control and untreated communes problematic, but these data indicate that clinical surveillance by itself is inadequate to monitor dengue transmission.

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“…obs.). Some cyclopoid copepods also feed mainly on algae, but others prey on small invertebrates, such as protozoans, rotifers, copepod nauplii, and copepodids, cladocerans, and dipteran larvae (Fryer 1957).…”

Section: The Large Branchiopodamentioning

confidence: 99%

Microcrustaceans (Branchiopoda and Copepoda) of Wetland Ponds and Impoundments on the Savannah River Site, Aiken, South Carolina

DeBiase¹,

Taylor²

2005

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The Food of Some Freshwater Cyclopoid Copepods and its Ecological Significance

Cited by 242 publications

References 16 publications

Seasonal changes in the importance of the source of organic matter to the diet of zooplankton in Loch Ness, as indicated by stable isotope analysis

Seasonal changes in the importance of the source of organic matter to the diet of zooplankton in Loch Ness, as indicated by stable isotope analysis

Control of aedes vectors of dengue in three provinces of Vietnam by use of Mesocyclops (Copepoda) and community-based methods validated by entomologic, clinical, and serological surveillance.

Microcrustaceans (Branchiopoda and Copepoda) of Wetland Ponds and Impoundments on the Savannah River Site, Aiken, South Carolina

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