Dietary Similarity of Some Primary Consumers

Ecology ◽  
1970 ◽  
Vol 51 (4) ◽  
pp. 640-648 ◽  
Author(s):  
R. M. Hansen ◽  
D. N. Ueckert
Keyword(s):  
Primary Consumers ◽  
Dietary Similarity

Primary consumers and particulate organic matter: Isotopic evidence of strong selectivity in the estuarine transition zone

2004 ◽  
Vol 49 (5) ◽  
pp. 1679-1686 ◽  
Author(s):  
Christine Martineau ◽  
Warwick F. Vincent ◽  
Jean-Jacques Frenette ◽  
Julian J. Dodson
Keyword(s):  
Organic Matter ◽  
Transition Zone ◽  
Particulate Organic Matter ◽  
Isotopic Evidence ◽  
Primary Consumers

Nitrogen-stable isotopic signatures of basal food items, primary consumers and omnivores in rivers with different levels of human impact

2008 ◽  
Vol 24 (1) ◽  
pp. 127-136 ◽  
Author(s):  
Ayato Kohzu ◽  
Ichiro Tayasu ◽  
Chikage Yoshimizu ◽  
Atsushi Maruyama ◽  
Yukihiro Kohmatsu ◽  
...  
Keyword(s):  
Human Impact ◽  
Isotopic Signatures ◽  
Food Items ◽  
Stable Isotopic ◽  
Primary Consumers ◽  
Different Levels

Behavioural observations on the scavenging fauna of the Patagonian slope

1999 ◽  
Vol 79 (6) ◽  
pp. 963-970 ◽  
Author(s):  
Martin A. Collins ◽  
Cynthia Yau ◽  
Conor P. Nolan ◽  
Phil M. Bagley ◽  
Imants G. Priede
Keyword(s):  
Soft Tissues ◽  
Deep Ocean ◽  
Rapid Response ◽  
The Other ◽  
Falkland Islands ◽  
Antimora Rostrata ◽  
Consumption Rates ◽  
Patagonian Toothfish ◽  
Primary Consumers ◽  
Dissostichus Eleginoides

The scavenging fauna of the Patagonian slope (900–1750 m), east of the Falkland Islands was investigated using the Aberdeen University Deep Ocean Submersible (AUDOS), an autonomous baited camera vehicle designed to photograph scavenging fish and invertebrates. The AUDOS was deployed on ten occasions in Falkland waters. Nine experiments were of 10–14 h duration and baited with 800 g of squid and one experiment lasted six days, baited with a 10 kg toothfish (Dissostichus eleginoides). Analysis of photographs revealed considerable patchiness in the composition of the scavenging fauna. Hagfish (Myxine cf. fernholmi) dominated three of the shallower experiments including the 6-d experiment, arriving quickly from down-current, holding station at the bait and consuming the soft tissues first, with consumption rates of up to 200 g h−1. In the other experiments, stone crabs (Lithodidae), the blue-hake (Antimora rostrata) and amphipods were the primary consumers, but the rate of bait consumption was lower. Patagonian toothfish (D. eleginoides) were attracted to the bait at each experiment, but did not attempt to consume the bait. The patchiness in the fauna may be a result of depth, substratum and topography, but in general the rapid response of the scavenging fauna indicates that carrion is rapidly dispersed, with little impact on the local sediment community.

From Lists to Literature

2019 ◽  
pp. 70-94
Author(s):  
William M. Schniedewind
Keyword(s):  
Bronze Age ◽  
Direct Evidence ◽  
Late Bronze Age ◽  
Biblical Literature ◽  
Primary Consumers ◽  
Biblical Texts

Spelling and vocabulary were taught though lexical lists. Fragments of at least two, perhaps three, of these lists are present at Kuntillet ʿAjrud. The standardization of spelling reflects the growth and centralization in government and bureaucracy, which were the primary consumers of writing. Fragments of cuneiform lists found in Israel dating to the Late Bronze Age give direct evidence of a vector of transmission for the cuneiform lexical tradition into early Israel. In fact, they provide a key for interpreting the Gezer Calendar as well as biblical texts. Lexical lists taught standardized spelling, but they also classified knowledge. In everyday commerce, lists were critical to administration and bureaucracy. In biblical literature, lists were adapted in a number of ways and incorporated into biblical literature.

scholarly journals Stable Isotope Food Web Analysis of a Large Subtropical Lake: Alternative Explanations for15N Enrichment of Pelagic vs. Littoral Fisheries

2003 ◽  
Vol 3 ◽  
pp. 613-622 ◽  
Author(s):  
Karl E. Havens ◽  
Binhe Gu ◽  
Brian Fry ◽  
Carol Kendall
Keyword(s):  
Stable Isotope ◽  
Food Web ◽  
Food Webs ◽  
Trophic Level ◽  
Stable Isotope Ratio ◽  
Pelagic Zone ◽  
Primary Producers ◽  
Subtropical Lake ◽  
Primary Consumers ◽  
Habitat Enrichment

The food webs of littoral, pelagic, and littoral-pelagic ecotone (interface) regions of a large subtropical lake were investigated using stable isotope ratio methods, expanding the focus of a previous fish-only study to include other food web components such as primary producers and invertebrates. In these food webs, δ13C increased ~4o/oo and δ15N increased ~10o/oo from primary producers to fish. The δ15N of fish was ~9o/oo in the littoral zone, ~10 o/oo in the ecotone, and ~12o/oo in the pelagic zone. The cross-habitat enrichment in fish15N corresponded with both an increase in the size of fish and an increase in the δ15N of primary consumers (mollusks). Despite larger body size in the pelagic zone, fish in all three habitats appear to occur at the same average trophic level (TL = 4), assuming an enrichment factor of 3.4o/oo per trophic level, and normalizing to the δ15N of primary consumers.

Primary Consumer Body Size and Food-Chain Length in Terrestrial Communities

2009 ◽  
Vol 55 (4) ◽  
pp. 329-343 ◽  
Author(s):  
Yoram Ayal ◽  
Elli Groner
Keyword(s):  
Body Size ◽  
Chain Length ◽  
Food Chain ◽  
Energetic Efficiency ◽  
Food Chains ◽  
Food Chain Length ◽  
Primary Consumer ◽  
Size Limitation ◽  
Energy Limitation ◽  
Primary Consumers

Using 21 community food webs, we tested Elton's two hypotheses regarding the main factors limiting food-chain length in terrestrial communities, namely, energy (energy limitation hypothesis—ELH) and body size (size limitation hypothesis—SLH). As predators tend to be larger than their prey, food-chains are size-structured: animal size increases with trophic position. We found a negative correlation between the size of the primary consumer and the length of the chain. Food-chains based on small primary consumers are longer than those based on large primary consumers, and size rather than energetic efficiency is the main contributing factor. We found no correlation between habitat productivity and mean food-chain length. All these findings support the SLH over the ELH. Our results suggest that, as in aquatic communities, a single factor—a predator/prey size-ratio greater than 1—governs the structure of terrestrial communities.

Sign in / Sign up

Export Citation Format

Share Document