Explorations in the Life of Fishes

Marshall, N. B.

doi:10.4159/harvard.9780674865129

Cited by 142 publications

(97 citation statements)

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“…The sagittae of both species are unusually large compared with head length and neurocranium volume, limiting the space devoted to the remaining inner ear structures and brain ( (Tables 1, 2). Other authors also highlighted that saccules are large relative to the skull in all ophidiid (Marshall, 1971;Fine et al, 1987) and carapid (Parmentier et al, 2001) species investigated to date. Unfortunately, the VolS/VolINC ratio has never been reported in previous studies.…”

Section: Discussion Sagitta Morphology: General Considerationsmentioning

confidence: 99%

Hearing capacities and otolith size in two ophidiiform species (Ophidion rocheiandCarapus acus)

Kéver

Colleye

Herrel

et al. 2014

Journal of Experimental Biology

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Numerous studies have highlighted the diversity of fish inner ear morphology. However, the function of the shape, size and orientation of the different structures remains poorly understood. The saccule (otolithic endorgan) is considered to be the principal hearing organ in fishes and it has been hypothesized that sagitta (saccular otolith) shape and size affect hearing capacities: large sagittae are thought to increase sensitivity. The sagittae of many ophidiids and carapids occupy a large volume inside the neurocranium. Hence they are a good structure with which to test the size hypothesis. The main aim of this study was to investigate hearing capacities and inner ear morphology in two ophidiiform species: Ophidion rochei and Carapus acus. We used a multidisciplinary approach that combines dissections, μCT-scan examinations and auditory evoked potential techniques. Carapus acus and O. rochei sagittae have similar maximal diameters; both species have larger otoliths than many nonophidiiform species, especially compared with the intra-neurocranium volume. Both species are sensitive to sounds up to 2100 Hz. Relative to the skull, O. rochei has smaller sagittae than the carapid, but better hearing capacities from 300 to 900 Hz and similar sensitivities at 150 Hz and from 1200 to 2100 Hz. Results show that hearing capacities of a fish species cannot be predicted only based on sagitta size. Larger otoliths (in size relative to the skull) may have evolved mainly for performing vestibular functions in fishes, especially those species that need to execute precise and complex movements.

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Section: Discussion Sagitta Morphology: General Considerationsmentioning

confidence: 99%

Hearing capacities and otolith size in two ophidiiform species (Ophidion rocheiandCarapus acus)

Kéver

Colleye

Herrel

et al. 2014

Journal of Experimental Biology

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“…The lack of primary production in the abyssal zone defines a trophic regime, which is fundamentally different from the trophic opportunities that exist in the euphotic zone. As a result, one might expect different selection pressures to hold, and this is borne out by the very marked adaptations that deep sea fish have because they live in a food poor habitat (Marshall 1971). These differences mean that in any analysis of diversity on seamounts, depth must be a prime variable, but within a given depth zone, we are claiming that the same theory can be used to predict patterns of diversity.…”

Section: Discussionmentioning

confidence: 99%

An application of the theory of island biogeography to fish speciation on seamounts

Hart¹,

Pearson²

2011

Mar. Ecol. Prog. Ser.

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Seamounts can be considered as islands in the deep. For many species, depth is just as much a barrier to dispersal as is the water between oceanic islands. This leads to the hypothesis that seamounts could be places where speciation readily occurs. Recent advances in the theory of island biogeography have allowed some detailed predictions about the degree of endemism and the diversity of species on oceanic islands. We have adapted this theory to seamounts, as underwater equivalents of islands. Three elements of this theory were tested as an illustration of what could be done, using published data on the diversity of reef-dwelling and benthic fish species found along the Hawaiian-Emperor seamount chain in the Pacific. Poor sampling makes it impossible at present to test the hypothesis that endemism is a humped function of seamount age. The data agrees with a further prediction that the total number of species is a humped function of seamount age. Finally, the prediction that fish diversity should be a function of seamount age and area is unsupported. We propose that the theory we have attempted to test could serve as a guide to what fish diversity might be expected from further sampling work.

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“…Because better resolution and sensitivity are achieved with bigger eyes, evolution has benefited animals that must perform considerable visual tasks with large eyes. Although there are many exceptions, epipelagic fishes with nocturnal activity or species inhabiting mesopelagic waters tend to have bigger eyes than diurnal shallow water species (Marshall 1971, Warrant & Locket 2004, Pulcini et al 2008, Antonucci et al 2009). In this context, the data we present here fit well with observations of the eye design in other diurnal and nocturnal teleosts.…”

Section: Sensory Specialisationmentioning

confidence: 99%

Sensory constraints in temporal segregation in two species of anglerfish, Lophius budegassa and L. piscatorius

Colmenero¹,

Aguzzi²,

Lombarte³

et al. 2010

Mar. Ecol. Prog. Ser.

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The temporal segregation of 2 ecologically equivalent and sympatric species, the black anglerfish Lophius budegassa and white anglerfish L. piscatorius, was studied in relation to day-night behaviour and the underlying morphological variation in the sensory organs. Temporally scheduled trawl sampling was conducted on the western Mediterranean shelf, and diel fluctuations in catches were used as a proxy of behavioural rhythms. L. budegassa was more abundant at night than L. piscatorius, which mostly occurred in daytime catches. The observed differences in the timing of maximum activity (i.e. catches) were consistent with differences in otolith sagittae weight, eye/lens sizes and optical sensitivity. L. budegassa presented significantly heavier otolith sagittae than L. piscatorius, indicating that the behaviour of the black anglerfish is mostly acoustically driven (a typical characteristic of species living in dim light conditions). Preference for a dim light environment was also confirmed by the high optical sensitivity observed in this species achieved by enlarging the photoreceptors' diameter. In contrast, L. piscatorius showed larger eyes and lenses than L. budegassa, but only in individuals larger than 50 cm. Large eyes usually improve photon capture and the fineness with which the image is sampled; however, relatively low values of sensitivity and resolution were observed in large L. piscatorius. This indicates that a trade-off might exist between the increase in eye size as an adaptive response to the impending deep meso-and bathypelagic life and a visual constraint imposed by the quality of the water at the bottom level where contrast can be degraded by suspended particles. These results indicate that interspecific competition with sympatric and ecologically equivalent species may result in different adaptations to diurnal/nocturnal behaviour, which are sustained by morphological specialisations in sensory organs.

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Explorations in the Life of Fishes

Cited by 142 publications

References 0 publications

Hearing capacities and otolith size in two ophidiiform species (Ophidion rocheiandCarapus acus)

Hearing capacities and otolith size in two ophidiiform species (Ophidion rocheiandCarapus acus)

An application of the theory of island biogeography to fish speciation on seamounts

Sensory constraints in temporal segregation in two species of anglerfish, Lophius budegassa and L. piscatorius

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Explorations in the Life of Fishes

Cited by 142 publications

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Hearing capacities and otolith size in two ophidiiform species (Ophidion rocheiandCarapus acus)

Hearing capacities and otolith size in two ophidiiform species (Ophidion rocheiandCarapus acus)

An application of the theory of island ­biogeography to fish speciation on seamounts

Sensory constraints in temporal segregation in two species of anglerfish, Lophius budegassa and L. piscatorius

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An application of the theory of island biogeography to fish speciation on seamounts