Predation on Nautilus

Saunders, W. Bruce; Spinosa, Claude; Davis, Larry E.

doi:10.1007/978-1-4899-5040-6_12

Cited by 24 publications

(20 citation statements)

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“…Considering their predatory behaviour on modern Nautilus , fish would have attacked ammonoids from the apertural side (Saunders et al . ; Martill ). Therefore, as Landman et al .…”

Section: Discussionmentioning

confidence: 99%

Durophagous predation on scaphitid ammonoids in the Late Cretaceous Western Interior Seaway of North America

Takeda

Tanabe

Sasaki

et al. 2016

LET

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This study is the first to report a trend of predation intensity on scaphitid ammonoids from the Turonian to the Maastrichtian (Late Cretaceous) on the basis of analysis of ventral shell breakage in large samples from the US Western Interior Province. Analysis of 835 adult specimens revealed ventral shell breakage in 50 specimens. In most of the damaged specimens, the breakage occurred in a preferred position at the rear part of the body chamber. Ventral breakage is rare in the Turonian specimens, whereas it is common in the Campanian and Maastrichtian specimens. The shell diameter of adult scaphitid ammonoids tends to increase with time. The position of the breakage and the absence of repairs indicate that the ventral breakage resulted from lethal predation. Based on the incidence of breakage and the size and shape of the breaks, possible predators include fish, reptiles and cephalopods such as Placenticeras, Eutrephoceras and coleoids. Our statistical analysis of ventral shell breakage indicates that the incidence of lethal predation increased in conjunction with an increase in adult shell size, suggesting that the body size of the prey was an important factor in predator–prey interactions. In addition, the predatory damage is more extensive in larger adults.

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“…Considering their predatory behaviour on modern Nautilus , fish would have attacked ammonoids from the apertural side (Saunders et al . ; Martill ). Therefore, as Landman et al .…”

Section: Discussionmentioning

confidence: 99%

Durophagous predation on scaphitid ammonoids in the Late Cretaceous Western Interior Seaway of North America

Takeda

Tanabe

Sasaki

et al. 2016

LET

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“…Many observed shell injuries in fossil cephalopods were apparently caused by predators (Kauffman & Kesling 1960; Saunders et al. 1987; Doguzhaeva 2002; Kauffman 2004; Keupp 2006; Turek & Manda 2010).…”

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confidence: 99%

Biological response to experimental damage of the phragmocone and siphuncle in Nautilus pompilius Linnaeus

Tsujino

Shigeta

2012

LET

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Tsujino, Y & Shigeta, Y. 2012: Biological response to experimental damage of the phragmocone and siphuncle in Nautilus pompilius Linnaeus. Lethaia, Vol. 45, pp. 443–449. Three adult specimens of Nautilus pomplilius Linnaeus from the Philippines were experimented on to estimate the biological response to damage of the phragmocone and siphuncle in this cephalopod mollusc. In addition, the data obtained from the experiments were used for discussion of shell damage in ammonoids and in other extinct cephalopods. Specimen’s phragmocone and siphuncle were perforated and severed artificially, followed by observations in the laboratory tank during periods of 75 and 132 days. For at least 2 or 3 months, all individuals survived after damage to the phragmocone and siphuncle despite loss of neutral buoyancy. Based on our observations after completion of the experiments, the severed adoral remaining part of siphuncle healed by the siphunclar epithelium. In addition, perforation of the phragmocone was partly repaired by shell secretion from the dorsally extending mantle due to subsequent volution of shell growth. Our experiments revealed that damage to the phragmocone and siphuncle in Nautilus was not necessarily a lethal injury. It may be possible that such biological response also applies to extinct ammonoids and nautiloids. In a similar case of extinct ammonoids and nautiloids, damage to their phragmocone and siphuncle may also not have been a lethal injury as with Nautilus. However, some factors leading to death are likely to be dependent on the degree of damage to the phragmocone and siphuncle and influence of hydraulic pressure. □Ammonoids, injury, nautiloids, Nautilus, phragmocone, repair, siphuncle.

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“…Yet Nautilus is a high-drag, low-speed propulsor with comparatively poor maneuverability living in a world dominated by low-drag, high-speed, highly maneuverable swimmers. Observations of encounters between Nautilus and such animals, reported by Saunders et al (1987), leave little doubt that Nautilus is completely outclassed by them. Against attacks by triggerfish and groupers, Nautilus is distressingly helpless and cannot escape the fish by either flight or maneuver.…”

Section: Propulsion and Ecologymentioning

confidence: 90%

“…Nautilus normally inhabits depths (150-500 m) into . which aggressive shallow-water teleosts do not generally venture (Saunders 1984;Saunders et al 1987). There is growing awareness (Ward 1984Saunders 1984) that the upper depth limit for Nautilus is defined at least partly by the habitat preferences of potential teleost predators and competitors.…”

Section: Propulsion and Ecologymentioning

confidence: 98%

Jet propulsion of Nautilus: a surviving example of early Paleozoic cephalopod locomotor design

Chamberlain¹

1990

Can. J. Zool.

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Like its coleoid relatives, Nautilus swims by jet propulsion. However, in the structure and functioning of its motor, Nautilus differs markedly from its contemporaries. Compared with that of squids, Nautilus locomotion is based on small propellant volume, low mantle cavity pressure, low propellant velocity, and small propulsive muscle mass. Propulsive performance of Nautilus is consequently unspectacular, with as little as one-eighth the thrust and one-tenth the burst speed observed in squids of equivalent size. Nautilus survives as a result of its slow-moving, vertically mobile, foraging life-style limited to habitats where competition with fast-moving, agile swimmers is minimal. Fossil cephalopods faced similar design constraints, which may have contributed to their decline, but nonbiologic factors such as sea level fluctuations may also have been important in directing the course of cephalopod evolution.

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Predation on Nautilus

Cited by 24 publications

References 0 publications

Durophagous predation on scaphitid ammonoids in the Late Cretaceous Western Interior Seaway of North America

Durophagous predation on scaphitid ammonoids in the Late Cretaceous Western Interior Seaway of North America

Biological response to experimental damage of the phragmocone and siphuncle in Nautilus pompilius Linnaeus

Jet propulsion of Nautilus: a surviving example of early Paleozoic cephalopod locomotor design

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