scholarly journals Stone Driveline Construction and Communal Hunting Strategies at the Ross Site, Alberta, Canada

Author(s):  
Jack W. Brink
2009 ◽  
Vol 74 (2) ◽  
pp. 299-321 ◽  
Author(s):  
David A. Byers ◽  
Brenda L. Hill

In this article, we use pronghorn dental age data to document pronghorn hunting strategies at Hogup Cave, Utah, and explore their relationship with a widespread late Holocene trend in increasing large-game abundances noted in archaeofaunal contexts throughout western North America. Specifically, we test the hypothesis that at Hogup Cave, pronghorn hunting methods changed from a middle Holocene strategy dominated by encounter hunting of individual animals to a late Holocene strategy emphasizing large-scale communal hunting. Our analysis suggests that ancient hunters visiting Hogup Cave most likely employed small-scale encounter hunting during the fall and winter months and that this subsistence pattern varied little between the middle and late Holocene. Moreover, while hunting strategies appear to have remained generally similar throughout the 8,800-year occupational record at Hogup Cave, artiodactyl abundances show a dramatic increase relative to smaller, lower-ranked prey in late Holocene strata, suggesting that a temporal shift in the favored hunting strategy, by itself, cannot explain this trend in every context.


Marine Drugs ◽  
2021 ◽  
Vol 19 (4) ◽  
pp. 202
Author(s):  
Rajesh Rajaian Pushpabai ◽  
Carlton Ranjith Wilson Alphonse ◽  
Rajasekar Mani ◽  
Deepak Arun Apte ◽  
Jayaseelan Benjamin Franklin

Marine cone snails are predatory gastropods characterized by a well-developed venom apparatus and highly evolved hunting strategies that utilize toxins to paralyze prey and defend against predators. The venom of each species of cone snail has a large number of pharmacologically active peptides known as conopeptides or conotoxins that are usually unique in each species. Nevertheless, venoms of only very few species have been characterized so far by transcriptomic approaches. In this study, we used transcriptome sequencing technologies and mass spectrometric methods to describe the diversity of venom components expressed by a worm-hunting species, Conus bayani. A total of 82 conotoxin sequences were retrieved from transcriptomic data that contain 54 validated conotoxin sequences clustered into 21 gene superfamilies including divergent gene family, 17 sequences clustered to 6 different conotoxin classes, and 11 conotoxins classified as unassigned gene family. Seven new conotoxin sequences showed unusual cysteine patterns. We were also able to identify 19 peptide sequences using mass spectrometry that completely overlapped with the conotoxin sequences obtained from transcriptome analysis. Importantly, herein we document the presence of 16 proteins that include five post-translational modifying enzymes obtained from transcriptomic data. Our results revealed diverse and novel conopeptides of an unexplored species that could be used extensively in biomedical research due to their therapeutic potentials.


2017 ◽  
Vol 284 (1861) ◽  
pp. 20170859 ◽  
Author(s):  
Mauricio J. Carter ◽  
Martin I. Lind ◽  
Stuart R. Dennis ◽  
William Hentley ◽  
Andrew P. Beckerman

Inducible, anti-predator traits are a classic example of phenotypic plasticity. Their evolutionary dynamics depend on their genetic basis, the historical pattern of predation risk that populations have experienced and current selection gradients. When populations experience predators with contrasting hunting strategies and size preferences, theory suggests contrasting micro-evolutionary responses to selection. Daphnia pulex is an ideal species to explore the micro-evolutionary response of anti-predator traits because they face heterogeneous predation regimes, sometimes experiencing only invertebrate midge predators and other times experiencing vertebrate fish and invertebrate midge predators. We explored plausible patterns of adaptive evolution of a predator-induced morphological reaction norm. We combined estimates of selection gradients that characterize the various habitats that D. pulex experiences with detail on the quantitative genetic architecture of inducible morphological defences. Our data reveal a fine scale description of daphnid defensive reaction norms, and a strong covariance between the sensitivity to cues and the maximum response to cues. By analysing the response of the reaction norm to plausible, predator-specific selection gradients, we show how in the context of this covariance, micro-evolution may be more uniform than predicted from size-selective predation theory. Our results show how covariance between the sensitivity to cues and the maximum response to cues for morphological defence can shape the evolutionary trajectory of predator-induced defences in D. pulex .


Koedoe ◽  
1991 ◽  
Vol 34 (1) ◽  
Author(s):  
Ina Plug ◽  
Paul Skelton

Fish remains from Late Iron Age sites in the Transvaal are relatively scarce. It seems as if the people did not utilize the riverine resources extensively. Therefore the unique assemblage of large numbers of fish bones on a Late Iron Age site, provides some insight into the fish population of a section of the Letaba River a few hundred years ago. The presence of other faunal remains provides some information on prehistoric utilization of the environment in general. Hunting strategies and aspects of herding can also be deduced from the faunal remains.


Science ◽  
2014 ◽  
Vol 346 (6205) ◽  
pp. 79-81 ◽  
Author(s):  
David M. Scantlebury ◽  
Michael G. L. Mills ◽  
Rory P. Wilson ◽  
John W. Wilson ◽  
Margaret E. J. Mills ◽  
...  

Population viability is driven by individual survival, which in turn depends on individuals balancing energy budgets. As carnivores may function close to maximum sustained power outputs, decreased food availability or increased activity may render some populations energetically vulnerable. Prey theft may compromise energetic budgets of mesopredators, such as cheetahs and wild dogs, which are susceptible to competition from larger carnivores. We show that daily energy expenditure (DEE) of cheetahs was similar to size-based predictions and positively related to distance traveled. Theft at 25% only requires cheetahs to hunt for an extra 1.1 hour per day, increasing DEE by just 12%. Therefore, not all mesopredators are energetically constrained by direct competition. Other factors that increase DEE, such as those that increase travel, may be more important for population viability.


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