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Journal articles on the topic 'Ommatophora'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Maxwell, Stephen J., Watt JL, and Payne MA. "Asymmetry of Eye Peduncle Length in Euprotomus Iredalei (Abbott, 1960) (Mollusca: Neostromboidae: Strombidae)." International Journal of Zoology and Animal Biology 7, no. 4 (2024): 1–3. http://dx.doi.org/10.23880/izab-16000594.

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This study examines the difference in right and left ommatophore length of Euprotomus iredalei from Karratha, Western Australia. In all specimens examined (n = 39, Males = 21, Females = 18) there was no evidence of imposex in terms of sexual organ abnormality or gonadal form, and all animals had right and left ommatophores that were of different lengths. This length difference was significant (t(38) = 10.315, p < 0.001) in the length of the ommatophore with the right longer (8.86 mm ± 0.23 SE) than the left (7.32 mm ± 0.19), and the effect size was large (d = 1.05). There was no sexual dimo

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2

Schwab, Ivan R., and David G. Heidemann. "Ommatophore (Eyestalk) Magic: Lobatus costatus." Ophthalmology 128, no. 11 (2021): 1548. http://dx.doi.org/10.1016/j.ophtha.2021.03.033.

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3

Shaughnessy, Peter D., and Robert Jones. "The size of Ross seal Ommatophoca rossii pups." Polar Biology 42, no. 10 (2019): 1931–33. http://dx.doi.org/10.1007/s00300-019-02558-5.

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4

Skinner, J. D., and L. M. Westlin-van Aarde. "Aspects of reproduction in female Ross seals (Ommatophoca rossii)." Reproduction 87, no. 1 (1989): 67–72. http://dx.doi.org/10.1530/jrf.0.0870067.

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5

Watkins, William A., and G. Carleton Ray. "In‐air and underwater sounds of the Ross seal, Ommatophoca rossi." Journal of the Acoustical Society of America 77, no. 4 (1985): 1598–600. http://dx.doi.org/10.1121/1.392003.

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6

Loza, Cleopatra Mara, Ashley E. Latimer, Marcelo R. Sánchez-Villagra, and Alfredo A. Carlini. "Sensory anatomy of the most aquatic of carnivorans: the Antarctic Ross seal, and convergences with other mammals." Biology Letters 13, no. 10 (2017): 20170489. http://dx.doi.org/10.1098/rsbl.2017.0489.

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Transitions to and from aquatic life involve transformations in sensory systems. The Ross seal, Ommatophoca rossii , offers the chance to investigate the cranio-sensory anatomy in the most aquatic of all seals. The use of non-invasive computed tomography on specimens of this rare animal reveals, relative to other species of phocids, a reduction in the diameters of the semicircular canals and the parafloccular volume. These features are independent of size effects. These transformations parallel those recorded in cetaceans, but these do not extend to other morphological features such as the red

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7

Laake, Jeff, Richard J. Guenzel, John L. Bengtson, Peter Boveng, Michael Cameron, and M. Bradley Hanson. "Coping with variation in aerial survey protocol for line-transect sampling." Wildlife Research 35, no. 4 (2008): 289. http://dx.doi.org/10.1071/wr07065.

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Altitude and flight speed affect detection probability and they typically vary during the course of most aerial surveys. We demonstrate how these sources of variation can be accommodated with covariates in a line-transect analysis using data from a pronghorn (Antilocapra americana) survey in Wyoming and a survey of Antarctic ice seals (Lobodon carcinophaga, Leptonychotes weddellii, Hydrurga leptonyx, Ommatophoca rossii). We also show how the likelihood for binned distance data can be modified to allow for variation in altitude. As an alternative, we develop an estimator for aerial line-transec

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8

Trawicki, Marek B. "Multispecies Discrimination of Seals (Pinnipeds) using Hidden Markov Models (HMMs)." International Journal of Automation, Artificial Intelligence and Machine Learning 4, no. 1 (2024): 1–9. http://dx.doi.org/10.61797/ijaaiml.v4i1.308.

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Hidden Markov Models (HMMs) were developed and implemented for the discrimination of 5 available Seals (Pinnipeds), namely the Bearded Seal (Erignathus barbatus), Harp Seal (Pagophilus groenlandicus), Leopard Seal (Hydrurga leptonyx), Ross Seal (Ommatophoca rossii), and Weddell Seal (Leptonychotes weddellii). The main objectives of the experiments were to study the impact of the frame size and step size and number of states for feature extraction and acoustic models on classification accuracy. Based on the experiments using Mel-Frequency Cepstral Coefficients (MFCCs) extracted from the vocaliz

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9

Trawicki, Marek B. "Multispecies discrimination of seals (pinnipeds) using hidden Markov models (HMMs)." Journal of the Acoustical Society of America 153, no. 3_supplement (2023): A222. http://dx.doi.org/10.1121/10.0018725.

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Hidden Markov models (HMMs) were developed and implemented for the discrimination of five available Seals (Pinnipeds), namely, the Bearded Seal (Erignathus Barbatus), Harp Seal (Pagophilus Groenlandicus), Leopard Seal (Hydrurga Leptonyx), Ross Seal (Ommatophoca Rossii), and Weddell Seal (Leptonychotes Weddellii). The main objectives of the experiments were to study the impact of the frame size and step size and number of states for feature extraction and acoustic models on classification accuracy. Based on the experimentation using Mel-Frequency Cepstral Coefficients (MFCCs) extracted from the

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10

Tedman, R. A. "Morphology of the reproductive tract of a juvenile male Ross Seal, Ommatophoca rossii (Pinnipedia: Phocidae)." Australian Mammalogy 14, no. 1 (1991): 35. http://dx.doi.org/10.1071/am91007.

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11

Torres, Alba J. Sebastián, David T. Holyoak, Geraldine A. Holyoak, Toro Francisco E. Vazquez, and Javier Ripoll. "An undescribed genus and species of Geomitridae (Gastropoda: Helicacea) from peridotite hills in Málaga Province, Spain." Iberus 36(2) (August 1, 2018): 111–23. https://doi.org/10.5281/zenodo.4765049.

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A hitherto unknown species of the family Geomitridae was discovered in 2014 on the Sierra Bermeja (Prov. Málaga, Spain). Subsequent searches in the same Province have revealed its presence at seven localities on this and other peridotite hills, but none on areas with other rock types. Its shell characters are unremarkable for a geomitrid, resembling those e.g. of <em>Helicella</em>. However, anatomical study has revealed that it has sufficiently distinctive genital anatomy for description of a new genus to be necessary. In particular, the presence of two very small vaginal appendages in

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12

Bengtson, John L., and Brent S. Stewart. "Diving patterns of a Ross seal ( Ommatophoca rossii ) near the eastern coast of the Antarctic Peninsula." Polar Biology 18, no. 3 (1997): 214–18. http://dx.doi.org/10.1007/s003000050178.

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13

Blix, Arnoldus Schytte, and Erling S. Nordøy. "Ross seal (Ommatophoca rossii) annual distribution, diving behaviour, breeding and moulting, off Queen Maud Land, Antarctica." Polar Biology 30, no. 11 (2007): 1449–58. http://dx.doi.org/10.1007/s00300-007-0306-y.

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14

Southwell, Colin. "Diving behaviour of two Ross seals off east Antarctica." Wildlife Research 32, no. 1 (2005): 63. http://dx.doi.org/10.1071/wr03090.

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The Ross seal (Ommatophoca rossii) is the least frequently sighted and least known of the Antarctic pinnipeds. Current knowledge of foraging and diving behaviour is based on observations of a single seal over <2 days. The current study provides some additional data on the diving behaviour of two Ross seals off east Antarctica over periods of 31 and 12 days during December–January 1999–2000 using satellite-linked dive recorders. Both seals remained over the continental shelf for these times, the female remaining some distance from the coast and the male moving close to the coast approximatel

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15

Southwell, Colin J., Charles G. M. Paxton, David L. Borchers, et al. "Estimating population status under conditions of uncertainty: the Ross seal in East Antarctica." Antarctic Science 20, no. 2 (2008): 123–33. http://dx.doi.org/10.1017/s0954102007000879.

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AbstractThe Ross seal (Ommatophoca rossii) is the least studied of the Antarctic ice-breeding phocids. In particular, estimating the population status of the Ross seal has proved extremely difficult. The Protocol on Environmental Protection to the Antarctic Treaty currently designates the Ross seal as a ‘Specially Protected Species’, contrasting with the IUCN's classification of ‘Least Concern’. As part of a review of the Ross seal's classification under the Protocol, a survey was undertaken in 1999/2000 to estimate the status of the Ross seal population in the pack ice off East Antarctica bet

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16

Shabangu, Fannie W., and Tracey L. Rogers. "Summer circumpolar acoustic occurrence and call rates of Ross, Ommatophoca rossii, and leopard, Hydrurga leptonyx, seals in the Southern Ocean." Polar Biology 44, no. 2 (2021): 433–50. http://dx.doi.org/10.1007/s00300-021-02804-9.

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Abstract Two of the Antarctic pack ice seals, Ross, Ommatophoca rossii, and leopard, Hydrurga leptonyx, seals, are extremely difficult to study via traditional visual survey techniques, yet are ideal for an acoustic survey as they are highly vociferous and produce an array of underwater sounds during the austral summer. To determine their acoustic occurrence in the Antarctic pack ice, we use their calls, detected within 680 acoustic recordings made between 1999 and 2009 as part of two multinational programmes. Siren calls of Ross seals were detected mainly in January, and 9.88 calls per minute

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17

Bryden, M. M., and A. W. Erickson. "Body size and composition of Crabeater seals (Lobodon carcinophagus), with observations on tissue and organ size in Ross seals (Ommatophoca rossi)." Journal of Zoology 179, no. 2 (2009): 235–47. http://dx.doi.org/10.1111/j.1469-7998.1976.tb02293.x.

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18

Arcalís-Planas, Anna, Signe Sveegaard, Olle Karlsson, et al. "Limited use of sea ice by the Ross seal (Ommatophoca rossii), in Amundsen Sea, Antarctica, using telemetry and remote sensing data." Polar Biology 38, no. 4 (2014): 445–61. http://dx.doi.org/10.1007/s00300-014-1602-y.

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19

Di Martino, Ceciia, Gustavo Daneri, and Esperanza Varela. "Morphometrics of two specimens of Ross Seal, Ommatophoca rossi, housed at the Mammals collection of the Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”." Revista del Museo Argentino de Ciencias Naturales 14 (2012): 135–41. http://dx.doi.org/10.22179/revmacn.14.213.

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20

Mphephu, Mukhethwa Micheal, Oyinlola Micheal Olaokun, Caswell Micheal Mavimbela, Greg Hofmeyer, M. Mwale, and Nqobile Monate Mkolo. "Metabolomics approach for predicting stomach and colon contents in dead Arctocephalus pusillus pusillus, Arctocephalus tropicalis, Lobodon carcinophaga and Ommatophoca rossii from sub-Antarctic region." PLOS ONE 19, no. 4 (2024): e0300319. http://dx.doi.org/10.1371/journal.pone.0300319.

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The dietary habits of seals play a pivotal role in shaping management and administration policies, especially in regions with potential interactions with fisheries. Previous studies have utilized various methods, including traditional approaches, to predict seal diets by retrieving indigestible prey parts, such as calcified structures, from intestines, feces, and stomach contents. Additionally, methods evaluating nitrogen and stable isotopes of carbon have been employed. The metabolomics approach, capable of quantifying small-scale molecules in biofluids, holds promise for specifying dietary e

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21

Oosthuizen, WC, RR Reisinger, MN Bester, et al. "Habitat-based density models of pack-ice seal distribution in the southern Weddell Sea, Antarctica." Marine Ecology Progress Series 673 (September 2, 2021): 211–27. http://dx.doi.org/10.3354/meps13787.

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Climate variability and changes in sea ice dynamics have caused several ice-obligate or krill-dependent populations of marine predators to decline, eliciting concern about their demographic persistence and the indirect ecological consequences that predator depletions may have on marine ecosystems. Pack-ice seals are dominant ice-obligate predators in the Antarctic marine ecosystem, but there is considerable uncertainty about their abundance and population trends. We modelled the density and distribution of pack-ice seals as a function of environmental covariates in the southern Weddell Sea, An

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22

Mesibov, Robert. "New records for millipedes from southern Chile (Polydesmida: Dalodesmidae; Polyzoniida: Siphonotidae)." Biodiversity Data Journal 5 (September 9, 2017): e15919. https://doi.org/10.3897/BDJ.5.e15919.

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Millipedes from 1983 collections by the author in southern Chile have been identified and registered as specimen lots at the Queen Victoria Museum and Art Gallery (QVMAG) in Launceston, Tasmania. Collection and specimen data from the new QVMAG specimen lots have been archived in Darwin Core format together with a KML file of occurrences. The 31 occurrence records in the Darwin Core Archive list 13 millipede taxa from 16 sites in Llanquihue and Osorno provinces, Chile.

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23

Zaitseva, O. V. "Comparative study of nerve elements and their relationships with Endocrine glands and muscle retractors in Ommatophores of snails and slugs." Journal of Evolutionary Biochemistry and Physiology 40, no. 6 (2004): 683–97. http://dx.doi.org/10.1007/s10893-004-0009-8.

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24

Zaitseva, O. V. "Comparative study of nerve elements and their relationships with Endocrine glands and muscle retractors in Ommatophores of snails and slugs." Journal of Evolutionary Biochemistry and Physiology 40, no. 6 (2004): 683–97. http://dx.doi.org/10.1007/s10893-005-0025-3.

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25

Miskelly, CM. "Records of three vagrant Antarctic seal species (Family Phocidae) from New Zealand: crabeater seal (Lobodon carcinophaga), Weddell seal (Leptonychotes weddellii) and Ross seal (Ommatophoca rossii)." New Zealand Journal of Marine and Freshwater Research 49, no. 4 (2015): 448–61. http://dx.doi.org/10.1080/00288330.2015.1080173.

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26

"Ommatophoca rossi." CABI Compendium CABI Compendium (January 7, 2022). http://dx.doi.org/10.1079/cabicompendium.71757.

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27

"Diving patterns of a Ross seal (Ommatophoca rossii) near the eastern coast of the Antarctic Peninsula." Oceanographic Literature Review 45, no. 2 (1998): 355. https://doi.org/10.1016/s0967-0653(98)81602-5.

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28

Skinner, J. D., and N. T. W. Klages. "On some aspects of the biology of the Ross seal Ommatophoca rossii from King Haakon VII Sea, Antarctica." Polar Biology 14, no. 7 (1994). http://dx.doi.org/10.1007/bf00239051.

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29

"On some aspects of the biology of the Ross seal Ommatophoca rossii from King Haakon VII Sea, Antarctica." Oceanographic Literature Review 42, no. 5 (1995): 396. https://doi.org/10.1016/0967-0653(95)94535-x.

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30

van den Hoff, John. "Incidental pinnipeds at high latitudes of the Vestfold Hills, Prydz Bay, East Antarctica." Antarctic Science, January 30, 2024, 1–6. http://dx.doi.org/10.1017/s0954102023000391.

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Abstract Species distributions are predicted to change with future climate-associated ecosystem changes such that so-called ‘vagrant’ individuals may become established or re-establish in areas currently thought to be beyond their principle ranges. Survey data were collated for occurrences of pinniped (seal) species at very high latitudes of the Vestfold Hills, East Antarctica. Aside from Weddell seals (Leptonychotes weddellii) and southern elephant seals (Mirounga leonina), which aggregate annually at the Vestfold Hills to breed and/or moult, three other pinniped species were observed with th

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31

Wege, Mia, Horst Bornemann, and Marthán Nieuwoudt Bester. "The nightlife of a Ross seal: diving and haul-out behaviour from the eastern Weddell Sea." Antarctic Science, January 6, 2023, 1–12. http://dx.doi.org/10.1017/s0954102022000438.

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Abstract Ross seals (Ommatophoca rossii) travel away from the pack ice and spend most of their year foraging pelagically. Here, we augment the few existing records of Ross seal diving and haul-out behaviour, providing novel insights into how these are influenced diurnally and seasonally. We used biologging devices that recorded the dive behaviour (n = 5) and/or haul-out behaviour (n = 9) of Ross seals in the eastern Weddell Sea (2016–2019). Ross seals mostly dived between 100 and 200 m deep, often > 300 m, and for 5–12 min in duration, often > 20 min. During March–July, when Ross seals f

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32

Golubev, Sergey. "Marine mammals records in the Haswell archipelago, East Antarctica." Czech Polar Reports 13, no. 1 (2023). http://dx.doi.org/10.5817/cpr2023-1-5.

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This is the first comprehensive review of marine mammal records from the Haswell archipelago (Davis Sea, East Antarctica), collected in 1912-2016. The goal of the review is to provide baseline ecological and faunal information on the marine mammals during the historical period (species diversity and status). Eight marine mammal species were recorded within the survey area. Ross seals (Ommatophoca rossii) and sei whales (Balaenoptera borealis) were seen very rarely. Killer whales (Orcinus orca), southern elephant seals (Mirounga leonina) and leopard seals (Hydrurga leptonyx) appeared rarely and

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33

"Correction: Metabolomics approach for predicting stomach and colon contents in dead Arctocephalus pusillus pusillus, Arctocephalus tropicalis, Lobodon carcinophaga and Ommatophoca rossii from sub-Antarctic region." PLOS ONE 19, no. 4 (2024): e0302976. http://dx.doi.org/10.1371/journal.pone.0302976.

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