+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Prey capture by the Pacific angel shark, Squatina californica: Visually mediated strikes and ambush-site characteristics



Prey capture by the Pacific angel shark, Squatina californica: Visually mediated strikes and ambush-site characteristics



Copeia 199(2): 304-312



Pacific angel sharks ambush demersal fishes by rapidly lunging from the sea floor. These sharks consistently attacked rubber and plastic prey models during in situ experiments. Videotaped strikes ranged from approximately 30-100 msec in duration and included extreme cranial elevations (as much as 90degree) toward the models. Eleven of 23 sharks tested attacked a fish model from beneath a transparent partition, which was designed to block near-field mechanical cues. Head-on approaches by the model elicited a higher frequency of attacks and shorter attack latencies than caudal approaches (frequency, P = 0.04; latency, P = 0.03). Night attacks may have been facilitated by turbulence-generated bioluminescence. Resting sharks and vacated depressions were usually adjacent to reefs, either facing or aligned parallel to margins of nearby reefs, and oriented toward upslope directions. Four sharks that were identified based on natural pigment patterns returned to the near proximities (< 3 m) of previously occupied ambush sites. Based on our experiments and observations, we suggest that (1) prey movement sensed visually is the most important cue for eliciting daytime attacks, (2) the sharks probably possess an anterodorsally directed field of vision, and (3) ambush sites are selected based on substrata characteristics likely to be associated with prey availability.

Please choose payment method:






(PDF emailed within 0-6 h: $19.90)

Accession: 011196689

Download citation: RISBibTeXText

DOI: 10.2307/1447476


Related references

Prey capture by the Pacific shark, Squatina californica visually mediated strikes and ambush-site characteristics. Copeia, 1999

First case of synophthalmia and albinism in the Pacific angel shark Squatina californica. Journal of Fish Biology 85(2): 494-501, 2014

Reproductive parameters of the Pacific angel shark Squatina californica (Selachii: Squatinidae). Journal of Fish Biology 88(4): 1430-1440, 2016

Reproduction and development of the pacific angel shark squatina californica off santa barbara california usa. Copeia (4): 987-994, 1986

Reproduction and development of the Pacific angel shark, Squatina californica, off Santa Barbara, California. Copeia(4): 7-94, 1986

Growth and demography of the Pacific angel shark (Squatina californica), based upon tag returns off California. Australian Journal of Marine and Freshwater Research 435: 1313-1330, 1992

Food habits of the Pacific angel shark Squatina californica in the southern Gulf of California, Mexico. Cybium 30(4, Suppl. S): 91-97, 2006

Evolutionary aspects of gene expression in the Pacific angel shark, Squatina californica (Squatiniformes: Squatinidae). Copeia. August 18; 3: 532-554, 1995

Population structure of the Pacific angel shark, Squatina californica (Squatiniformes: Squatinidae), around the California Channel Islands. Copeia. December 9; 4: 738-744, 1997

An intrauterine leech infection Brancheiion lobata Moore, 1952 Piscicolidae in the Pacific angel shark Squatina californica. Canadian Journal of Zoology 554: 759-760, illust., 1977

An intra uterine leech infection branchellion lobata piscicolidae in the pacific angel shark squatina californica from california usa. Canadian Journal of Zoology 55(4): 759-760, 1977

Organochlorine contaminants and maternal offloading in the lecithotrophic Pacific angel shark (Squatina californica) collected from southern California. Marine Pollution Bulletin 97(1-2): 518-522, 2015

An intra-uterine leech infection: Branchellion lobata Moore, 1952 (Piscicolidae) in the Pacific angel shark (Squatina californica) from California. Canadian Journal of Zoology 55(4): 759-760, 1977

Mercury Concentrations in Pacific Angel Sharks (Squatina californica) and Prey Fishes from Southern Gulf of California, Mexico. Bulletin of Environmental Contamination and Toxicology 96(1): 15-19, 2016