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12 results for “Coordinated hunting”
Fig. 7 in Coordinated hunting behaviors of mixed-species groups of piscivores and associated species at Isla del Coco National Park (Eastern Tropical Pacific)
Fig. 7. Cluster analysis of species co-occurrences in groups based on the Ward linkage method and Pearson distance. Abbreviations for each species are defined in Tab. 1. Note two dominant clusters (cluster 1 at left and cluster 2 at right). An asterisk below species codes indicate membership in top 10 species based on mixed-species links.
Fig. 5 in Coordinated hunting behaviors of mixed-species groups of piscivores and associated species at Isla del Coco National Park (Eastern Tropical Pacific)
Fig. 5. Network visualization of the web of associations between species (33 species with 288 pair-wise links). The size of each species node is weighted relative to the frequency of each species in any group (abbreviations for each species are defined in Tab. 1). The lines between species nodes are weighted by the relative frequency of associations between each species pair.
Fig. 3 in Coordinated hunting behaviors of mixed-species groups of piscivores and associated species at Isla del Coco National Park (Eastern Tropical Pacific)
Fig. 3. Examples of mixed-species hunting groups observed to ca. 35 m depth. (A) Caranx melampygus, Dermatolepis dermatolepis and Bodianus diplotenia at a crevice. Note D. dermatolepis and B. diplotaenia are able to maneuver deep into the crevice while C. melampygus follow from above and search for escaping prey. (B) Group composed of C. melampygus, Trianodon obesus, Cephalopholis panamensis and unidentified muraenid eel (hidden within crevices) hunt for prey within crevices amongst coral and coral rubble along reef edge. (C) Lutjanus argentiventris, D. dermatolepis, C. melampygus and B. diplotaenia hunt for prey as group traverses low relief volcanic pavement along a pinnacle. (D) Group composed of D. dermatolepis, C. melampygus and Aulostomus chinensis. Note position of A. chinensis in lead over C. melampygus. (E) C. melampygus follows above a muraenid eel hunting within narrow crevices. (F) As in previous image, D. dermatolepis follows above muraenid eel hunting within narrow crevice. (G) C. melampygus follow B. diplotaenia hunting over sand and volcanic rubble habitat. (H) B. diplotaenia and A. chinensis hunt in tandem along edge of pinnacle.
No evidence that lionfish Pterois miles coordinate and reciprocate during hunts
<p><span>Collaborative hunting can be defined as predators coordinating their movements in time and space, assuming different roles in catching prey. As lionfishes are naturally solitary hunters; an experimental study documenting active recruitment, coordination and alternating (potentially reciprocal) striking in dwarf lionfish <em>Dendrochirus zebra</em> received major attention. A hypothesis was that collaborative hunting may contribute to the successful invasion of another lionfish species, <em>Pterois miles</em>, in the Caribbean. A first study on <em>P. miles</em> in the native range, the Red Sea did not find evidence for any recruitment signaling. Here, we expand on these results, testing for coordinated movements and for alternation in strikes. We exposed subject pairs to inaccessible prey in three transparent housings. The two lionfish did not aggregate at the same prey housing or even share larger space units in the presence of prey. In a second experiment, we found that some alternation can be induced if prey items become alternatingly accessible at two corners, with each lionfish tending to monopolise one corner each. When the movement of prey is slow or even absent, we observed less alternation than expected by chance. In conclusion, <em>P. miles</em> in the Red Sea does not use any coordination to hunt prey.</span></p>
No evidence that lionfish Pterois miles coordinate and reciprocate during hunts
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Fig. 2 in Coordinated hunting behaviors of mixed-species groups of piscivores and associated species at Isla del Coco National Park (Eastern Tropical Pacific)
Fig. 2. Cumulative species richness based on consecutive samples (open circles) as well as Chao 1 (open diamonds) and Michaelis-Menton estimates of species richness (solid circles). Values calculated using Primer version 6.1.13 software.
Fig. 4 in Coordinated hunting behaviors of mixed-species groups of piscivores and associated species at Isla del Coco National Park (Eastern Tropical Pacific)
Fig. 4. Examples of mixed-species hunting groups from ca. 50-80 m depth at the Everest deep pinnacle site. (A) Caranx melampygus, Caranx lugubris, Mycteroperca olfax hunting in groups around the steep upper slope and peak, where smaller prey fish like Paranthias colonus aggregate in the water column. Periodic attacks by single fish and adjacent pairs were observed. (B) C. melampygus, C. lugubris and M. olfax move as a group but widely spaced in this setting. Individual fish attacked proximate prey that reacted to nearby predators. (C) Seriola rivoliana, D. dermatolepis, Lutjanus argentiventris, Bodianus diplotaenia and Aulostomus chinensis hunt for prey amongst corals and within crevices. (D) Image recorded soon after C (previous image) illustrating D. dermatolepis and B. diplotaenia entering, and A. chinensis emerging from a dense patch of corals to hunt while S. rivoliana maneuver above to encounter potential escaping prey. (E) M. olfax and L. argentiventris follow a moray eel (hidden within narrow crevice). (F) Large group of S. rivoliana and M. olfax move in tandem around the summit and upper slope, with occasional attacks by individuals on potential prey.
Fig. 6 in Coordinated hunting behaviors of mixed-species groups of piscivores and associated species at Isla del Coco National Park (Eastern Tropical Pacific)
Fig. 6. Relationships between three metrics of network connectivity in order to identify important species within the behavior web (species pair-wise links = open diamond and dotted line, total occurrences per species = open triangle and dashed line, network strength = solid circle and solid line). Species on x-axis in descending order based on value of pair-wise links (as in Tab. 1). Regression lines are based on the power function. Eigenvector centrality values (open circle) plotted for comparison.
Fig. 8 in Coordinated hunting behaviors of mixed-species groups of piscivores and associated species at Isla del Coco National Park (Eastern Tropical Pacific)
Fig. 8. Linear regression of total pair-wise links in the behavior web on species richness (links = -781.8 + 32.08 S; r2 = 99.1) based on fisheries removal simulation. Noteworthy is the rapid decline in linkages within the behavior web with removal of only several key species. The reduction in species richness is with the sequential removal of first Caranx melampygus and Trianodon obesus, then Dermatolepis dermatolepis, Caranx lugubris and Bodianus diplotaenia from the data set in this study (see text for detailed explanation).
Fig. 1 in Coordinated hunting behaviors of mixed-species groups of piscivores and associated species at Isla del Coco National Park (Eastern Tropical Pacific)
Fig. 1. Location map. BA = Bajo Alcyone, DA = Big Dos Amigos, CB = Chatham Bay, DR = Dirty Rock, EV = Eve- rest, IP = Isla Pájara, MC = Manuelita Channel, MG = Ma- nuelita Coral Garden, MO = Manuelita Outside, PM = Punta María, SF = Shark Fin Rock, SR = Submerge Rock, VR = Viking Rock.
Data from: Coordination strategies of chimpanzees and human children in a stag hunt game
Much of human cooperation takes place in mutualistic contexts in which the main challenge for individuals is how to coordinate decisions. In the current studies, we compared the abilities of chimpanzees and young children to coordinate with a partner in two versions of a Stag Hunt game. When risks were low (the hare was of low value) and information was cheap (the partner's behaviour was readily observable), partners of both species were able to successfully coordinate on the higher value stag more than 90% of the time. By contrast, when the risks were raised and observing the partner was more difficult, the chimpanzees became less successful, whereas the children compensated, and so remained highly successful, by communicating more often and more specifically. This pattern of results is consistent with the hypothesis that humans evolved unique skills of coordination and communication in the context of especially risky coordination problems.
Data from: Coordination strategies of chimpanzees and human children in a stag hunt game
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