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Journal articles on the topic 'Delphus'

Author: Grafiati

Published: 29 July 2024

Last updated: 30 July 2024

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1

Романов, Б. В. "Изучение костей нижней челюсти Delphinus delphus как элемента наружного органа слуха." Труды Карадагской научной станции им. Т.И. Вяземского - природного заповедника РАН, no. 4 (16) (April 22, 2021): 68–75. http://dx.doi.org/10.21072/eco.2021.16.07.

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Процесс проведения акустических сигналов к внутреннему уху зубатых китообразных является одним из ключевых вопросов устройства сонара этих животных, но до сих пор у исследователей нет однозначного ответа на него. Основная роль в проведении высокочастотной составляющей звука отводится морфологическим структурам нижней челюсти. Считается, что звук в эти структуры проникает через «акустические окна» - область в каудальной части каждой из половин нижней челюсти. По другой версии прохождение звука начинается в ростральной части через подбородочные каналы. До сих пор изучение этого вопроса производилось только на костях нижней челюсти Tursiops truncatus. В данной работе подобные данные получены из анализа морфологии костей Delphinus delphus.

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2

Corbridge,, James N., and Daniel Tyler. "Silver Fox of the Rockies: Delphus E. Carpenter and Western Water Compacts." Western Historical Quarterly 35, no. 3 (October 1, 2004): 387. http://dx.doi.org/10.2307/25443028.

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3

Rowley, William D. "Silver Fox of the Rockies: Delphus E. Carpenter and Western Water Compacts." Agricultural History 78, no. 3 (July 1, 2004): 385–87. http://dx.doi.org/10.1215/00021482-78.3.385.

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4

STURGEON, STEPHEN C. "Silver Fox of the Rockies: Delphus E. Carpenter and Western Water Compacts." Utah Historical Quarterly 72, no. 2 (April 1, 2004): 176–77. http://dx.doi.org/10.2307/45062860.

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5

Larsen, Lawrence H. "Reviews of Books:Silver Fox of the Rockies: Delphus E. Carpenter and Western Water Compacts Daniel Tyler." American Historical Review 109, no. 4 (October 2004): 1244–45. http://dx.doi.org/10.1086/530812.

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6

Rowley, William D. "Review of Silver Fox of the Rockies: Delphus E. Carpenter and Western Water Compacts by Daniel Tyler." Agricultural History 78, no. 3 (July 2004): 385–87. http://dx.doi.org/10.1525/ah.2004.78.3.385.

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7

Davison, Nicholas J., James E. F. Barnett, Mark Koylass, Adrian M. Whatmore, Matthew W. Perkins, Robert C. Deaville, and Paul D. Jepson. "HELICOBACTER CETORUM INFECTION IN STRIPED DOLPHIN (STENELLA COERULEOALBA), ATLANTIC WHITE-SIDED DOLPHIN (LAGENORHYNCHUS ACUTUS), AND SHORT-BEAKED COMMON DOLPHIN (DELPHINUS DELPHUS) FROM THE SOUTHWEST COAST OF ENGLAND." Journal of Wildlife Diseases 50, no. 3 (July 2014): 431–37. http://dx.doi.org/10.7589/2013-02-047.

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8

Malinky, John M. "Early and Middle Cambrian Hyolitha (Mollusca) from northeastern China." Journal of Paleontology 64, no. 2 (March 1990): 228–40. http://dx.doi.org/10.1017/s0022336000018394.

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The hyolithid species Hyolithes crebescens Resser and Endo, Hyolithes cybele Walcott, and Hyolithes delphus Resser and Endo from the Middle Cambrian of China are assigned respectively to the genera Nevadotheca Malinky, Novakotheca n. gen., family Hyolithidae, and Crestjahitus Syssoiev, family uncertain, all in the order Hyolithida. Recognition of Nevadotheca extends its geographic range from North America to China, and the occurrence of Crestjahitus in the Middle Cambrian of China increases its geographic and stratigraphic distribution from the Early Cambrian of the Soviet Union.Poor preservation of the type specimens of Hyolithes? aliger Resser and Endo, H.? aplatus Resser and Endo, H.? cariniferus Resser and Endo, H.? daphnis Walcott, H.? delia Walcott, H.? endoi Howell (as H. ornatus Resser and Endo), H.? mantouensis Resser and Endo, and H.? tenuis Resser and Endo renders their generic identification uncertain. Hyolithes (Orthotheca) glabrus Resser and Endo is here transferred to the hyolith order Orthothecida Marek and referred with question to Decoritheca Syssoiev, family Novitatidae.Morphology of the types of “Hyolithes” fuchouensis Resser and Endo, “H.” kuantungensis Resser and Endo, “H.” sondai Resser and Endo, “Orthotheca” daulis Walcott, and “O.” doris Walcott does not support assignment to the Hyolitha for these species; their phylogenetic affinity is uncertain.

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9

Ilieva, Sonya. "DELPHIC ORACLE, RAND CORPORATION AND DELPHI METHOD." Journal scientific and applied research 4, no. 1 (October 10, 2013): 192–99. http://dx.doi.org/10.46687/jsar.v4i1.99.

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The point of this article is to show what binds the Delphic oracle, the RAND Corporation and Delphi method. And the connecting link is the long-term forecasting. Since ancient times, people have sought to break into the future to build a rational life in the present. It is mentioned that this was done through the intuitive forecasting. Present offers another starting point for looking into the future that combines scientific intuition plus reliable statistics and mathematics and other models such as the method for long-term forecasting - Delphi method, developed by think tank RAND Corporation - USA. Thanks to its research capacity, the corporation established for decades that a highly effective forecasting method, reflecting the overall theoretical and experimental work in a series of reports. They become a kind of milestones for researchers from around the world to successfully apply it in their scientific and practical activities.

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10

Sanino, Gian Paolo, Koen Van Waerebeek, and José Yáñez. "Revisión de la distribución del género Delphinus y primeros registros documentados de Delphinus capensis en Chile." Boletín Museo Nacional de Historia Natural 52 (December 26, 2003): 97–102. http://dx.doi.org/10.54830/bmnhn.v52.2003.311.

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El registro actualizado de delfines del género Delphinus para aguas chilenas, incluye tres avistamientos de Delphinus delphis totalizando 650 individuos, dos avistamientos de Delphinus capensis totalizando 310 individuos,14 avistamientos de Delphinus sp. totalizando 593 individuos y tres varamientos individuales de Delphinus delphis restringidos a la IV y V Regiones. Los tres varamientos estudiados, corresponden a Delphinus delphis considerando las características diagnósticas actuales. El área de distribución del género Delphinus, se mantiene en los 40º S, tanto para zonas costeras como pelágicas. Se amplía el área de distribución de D. capensis, por sobre los 28º S, pero al igual que en el Perú, limitándose a zonas cercanas a la costa y relacionado a la presencia de Lagenorhynchus obscurus. Delfines del género Delphinus, pueden presentarse y también permanecer, por un tiempo variable, en el borde costero en grupos de dos a tres individuos.

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11

Grzesik, Dominika. "The Power of Space and Memory: The Honorific Statuescape of Delphi." Antichthon 52 (2018): 23–42. http://dx.doi.org/10.1017/ann.2018.6.

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AbstractThis article discusses the evolution and main characteristics of Delphi’s statuary landscape, focussing on the process of prestige spatialisation via erection of honorific portraits within the Delphic territory. My goal is to present trends and tendencies in placing honorific portraits at Delphi from the mid-fifth centuryb.c.to the late fourth centurya.d.The article focusses on issues surrounding the locations for honorific statues and how these featured in attempts to monopolise the sanctuary’s overall lay-out throughout by vying for the most conspicuous places at Delphi. I argue that the placement of honorific statues within the Delphictemenoswas not random but was in fact a precisely planned process which was influenced by several (variable) factors. These factors included the availability of space, the visibility of the monuments, and the number of visitors that could be expected. The relationship between Delphi and the League of the Aetolians is particularly stressed in association with the question regarding the nature of the Aetolian self-representation at Delphi. I contrast Delphi with Thermos to assess the degree to which the Aetolians dominated the sanctuary and how they presented themselves to both internal and external audiences.

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12

Flower, William Henry. "5. On the Common Dolphin, Delphinus delphis. Linn." Proceedings of the Zoological Society of London 47, no. 1 (August 21, 2009): 382–84. http://dx.doi.org/10.1111/j.1096-3642.1879.tb02668.x.

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13

Oswald, Julie N., Sam F. Walmsley, Caroline Casey, Selene Fregosi, Brandon Southall, and Vincent M. Janik. "Species information in whistle frequency modulation patterns of common dolphins." Philosophical Transactions of the Royal Society B: Biological Sciences 376, no. 1836 (September 6, 2021): 20210046. http://dx.doi.org/10.1098/rstb.2021.0046.

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The most flexible communication systems are those of open-ended vocal learners that can acquire new signals throughout their lifetimes. While acoustic signals carry information in general voice features that affect all of an individual's vocalizations, vocal learners can also introduce novel call types to their repertoires. Delphinids are known for using such learned call types in individual recognition, but their role in other contexts is less clear. We investigated the whistles of two closely related, sympatric common dolphin species, Delphinus delphis and Delphinus bairdii , to evaluate species differences in whistle contours. Acoustic recordings of single-species groups were obtained from the Southern California Bight. We used an unsupervised neural network to categorize whistles and compared the resulting whistle types between species. Of the whistle types recorded in more than one encounter, 169 were shared between species and 60 were species-specific (32 D. delphis types, 28 D. bairdii types). Delphinus delphis used 15 whistle types with an oscillatory frequency contour while only one such type was found in D. bairdii . Given the role of vocal learning in delphinid vocalizations, we argue that these differences in whistle production are probably culturally driven and could help facilitate species recognition between Delphinus species. This article is part of the theme issue ‘Vocal learning in animals and humans’.

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14

Toropova, Caitlyn. "Acoustic geographic variation in two populations of Delphinus delphis." Journal of the Acoustical Society of America 102, no. 5 (November 1997): 3178–79. http://dx.doi.org/10.1121/1.420829.

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15

Tornero, V., A. Borrell, J. Forcada, and Á. Aguilar. "Tissue distribution of retinoids in common dolphins Delphinus delphis." Marine Ecology Progress Series 280 (2004): 275–83. http://dx.doi.org/10.3354/meps280275.

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16

Aroyan, James L., Ted W. Cranford, Joel Kent, and Kenneth S. Norris. "Computer modeling of acoustic beam formation in Delphinus delphis." Journal of the Acoustical Society of America 92, no. 5 (November 1992): 2539–45. http://dx.doi.org/10.1121/1.404424.

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17

Manconi, Barbara, Irene Messana, Federica Maggiani, Alessandra Olianas, Mariagiuseppina Pellegrini, Roberto Crnjar, Massimo Castagnola, Bruno Giardina, and Maria Teresa Sanna. "Structural and functional characterization of Delphinus delphis hemoglobin system." Journal of Comparative Physiology B 179, no. 8 (June 25, 2009): 971–83. http://dx.doi.org/10.1007/s00360-009-0380-2.

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18

Gaskin, David Edward. "Status of the Common Dolphin, Delphinus delphis, in Canada." Canadian field-naturalist 106, no. 1 (1992): 55–63. http://dx.doi.org/10.5962/p.356885.

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19

Bell, CH, CM Kemper, and JG Conran. "Common Dolphins (Delphinus Delphis) In Southern Australia: A Morphometric Study." Australian Mammalogy 24, no. 1 (2002): 1. http://dx.doi.org/10.1071/am02001.

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Examination of 211 Delphinus specimens from the coasts of Western Australia to New South Wales, including Tasmania, was conducted using 62 quantitative and 11 qualitative variables. After refining the dataset, multivariate analyses were performed on 130 cranially mature specimens using 21 cranial variables. MANOVA showed males to be slightly larger than females, but with substantial overlap, allowing analyses to combine genders. UPGMA Cluster Analysis and MDS Ordination showed three largely overlapping groups based on a size gradient. K-means analysis of these groups found no significant differences and confirmed a size gradient. Discriminant analysis of specimens grouped by geography and water depth showed a tendency for large skulls to be from coasts adjacent to deep water and small skulls from shallow water coasts. Cranial measurements were significant, postcranial measurements and features were not. Tooth counts were within the range for D. delphis for all specimens examined. This study confirms genetic evidence for a single continuously variable species (Delphinus delphis Linnaeus, 1758) in southern Australian waters. Compared with either D. delphis or D. capensis from the eastern North Pacific, the skulls of D. delphis in southern Australia were more variable for many characters.

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20

Rizac, R. I., A. C. Stoian, D. G. Soare, C. Gal, and T. Soare. "Incidental by-catch of Delphinus delphis in the Black Sea." Journal of Comparative Pathology 166 (January 2019): 145. http://dx.doi.org/10.1016/j.jcpa.2018.10.146.

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21

Ryan, Conor, Greig Macleod, Cameron Dinsdale, and Stuart Cook. "Long-Term Association Between a Solitary Common Dolphin (Delphinus delphis delphis) and a Harbour Porpoise (Phocoena phocoena)." Aquatic Mammals 43, no. 1 (January 15, 2017): 113–15. http://dx.doi.org/10.1578/am.43.1.2017.113.

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22

Murphy, S., A. Winship, W. Dabin, PD Jepson, R. Deaville, RJ Reid, C. Spurrier, et al. "Importance of biological parameters in assessing the status of Delphinus delphis." Marine Ecology Progress Series 388 (August 19, 2009): 273–91. http://dx.doi.org/10.3354/meps08129.

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23

Thompson, Finlay N., Edward R. Abraham, and Katrin Berkenbusch. "Common Dolphin (Delphinus delphis) Bycatch in New Zealand Commercial Trawl Fisheries." PLoS ONE 8, no. 5 (May 22, 2013): e64438. http://dx.doi.org/10.1371/journal.pone.0064438.

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24

Díaz-Delgado, J., los Espinosa de los Monter, C. Fernández-Maldonado, M. Arbelo, O. Quesada-Canales, M. Andrada, and A. Fernández. "Mixed testicular neoplasia in a short beaked common dolphin Delphinus delphis." Diseases of Aquatic Organisms 101, no. 3 (November 19, 2012): 257–60. http://dx.doi.org/10.3354/dao02525.

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25

Miclard, J., K. Mokhtari, G. Jouvion, B. Wyrzykowski, O. Van Canneyt, M. Wyers, and M. A. Colle. "Microcystic Meningioma in a Dolphin (Delphinus delphis): Immunohistochemical and Ultrastructural Study." Journal of Comparative Pathology 135, no. 4 (November 2006): 254–58. http://dx.doi.org/10.1016/j.jcpa.2006.08.005.

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26

Silva, M. A. "Diet of common dolphins, Delphinus delphis, off the Portuguese continental coast." Journal of the Marine Biological Association of the United Kingdom 79, no. 3 (June 1999): 531–40. http://dx.doi.org/10.1017/s0025315498000654.

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Diet of common dolphins off the Portuguese coast was studied based on the examination of stomach contents of 50 stranded and incidentally caught animals. The relative importance of each prey species was assessed through occurrence, numerical and biomass indices. Common dolphins preyed on a large variety of items but four fish and two cephalopod species appeared to form the basis of their diet. Overall, sardine (Sardina pilchardus) was the most important prey, as given by all the indices used to measure prey relative importance. Although common dolphins preyed mostly on pelagic species, they seemed able to explore habitats with distinct features and employ various foraging strategies. A comparison between the diet of dolphins of different sex and size groups was not indicative of major differences. Common dolphins incidentally caught in fishing nets had taken a higher proportion of sardines, the target species of the fishery.

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Sanino, Gian Paolo, Christopher Hamilton-West, Alejandra Rojas, José Yáñez, and Koen Van Waerebeek. "Estudios de restos varados de Delphinus delphis y primer registro documentado de pneumonia focal abscedativa en Chile." Boletín Museo Nacional de Historia Natural 52 (December 26, 2003): 103–17. http://dx.doi.org/10.54830/bmnhn.v52.2003.312.

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Se estudió los restos de tres especímenes de delfín común, varados en las playas de la IV y V Regiones. En base al índice entre la longitud de rostro y ancho zigomálico (RU/ZYGW, de 1.31 a 1.40) y el reducido número de alveoli (total maxilar de 72 a 90), se determinó la especie como delfín común de rostro corto Delphinus delphis. Al igual que las diferencias craneales, mandibulares y patrón de pigmentación, la diferencia morfológica interna y externa en la dentición de los restos estudiados, no es atribuible al desarrollo, pero se requieren más estudios similares para dilucidar si se trata de variaciones poblacionales. Los resultados de los análisis histopatológicos, microbiológicos, histológicos y cronométricos dentales, demuestran que el individuo CHW001, de sexo femenino, presentó heridas ulceradas en el paladar, desde donde se sugiere que una bacteria Gram y Ziehl Neelsen negativa, provocó en los pulmones, por vía hemática, una pneumonía focal abscedativa, que causó su deceso por insuficiencia respiratoria. Mediante las técnicas de cronometría dental por desgaste ácido, descalcificación y tinción, y micrografía de luz polarizada, se estimó la edad en dos D. delphis varados, MNHNI488 y CHW001, en 4.8 y 8.3 años respectivamente. L1 longitud corporal in vivo, de Delphinus delphis, podría ser determinada a partir de carcasas de restos de varamientos, al considerar un 36% de disminución del espacio intervertebral , producto de la desecación.

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28

Dayé, Christian. "How to train your oracle: The Delphi method and its turbulent youth in operations research and the policy sciences." Social Studies of Science 48, no. 6 (September 19, 2018): 846–68. http://dx.doi.org/10.1177/0306312718798497.

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Delphi is a procedure that produces forecasts on technological and social developments. This article traces the history of Delphi’s development to the early 1950s, where a group of logicians and mathematicians working at the RAND Corporation carried out experiments to assess the predictive capacities of groups of experts. While Delphi now has a rather stable methodological shape, this was not so in its early years. The vision that Delphi’s creators had for their brainchild changed considerably. While they had initially seen it as a technique, a few years later they reconfigured it as a scientific method. After some more years, however, they conceived of Delphi as a tool. This turbulent youth of Delphi can be explained by parallel changes in the fields that were deemed relevant audiences for the technique, operations research and the policy sciences. While changing the shape of Delphi led to some success, it had severe, yet unrecognized methodological consequences. The core assumption of Delphi that the convergence of expert opinions observed over the iterative stages of the procedure can be interpreted as consensus, appears not to be justified for the third shape of Delphi as a tool that continues to be the most prominent one.

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29

Galili, Ori, Oz Goffman, Mia Roditi-Elasar, Yaly Mevorach, Eyal Bigal, Yotam Zuriel, Yaron Haitovich, et al. "Two Decades of Coastal Dolphin Population Surveys in Israel, Eastern Mediterranean." Biology 12, no. 2 (February 17, 2023): 328. http://dx.doi.org/10.3390/biology12020328.

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Along the Mediterranean coast of Israel, two near-shore dolphin species are prevalent; Tursiops truncatus (least concern, IUCN) and Delphinus delphis (endangered, IUCN). Ship-board surveys and sporadic sightings over the last two decades have shown that the two differ in distribution—T. truncatus is found along the entire coast and D. delphis only in the south. The environmental and anthropological factors affecting these species’ spatial distribution and determining their habitat preferences in this area are largely unknown. This work is a first attempt at summarizing 20 years of observations and studying habitat preferences for both species, by use of Generalized Additive Models. T. truncatus was found to be present in all areas of the continental shelf where survey effort coverage was sufficient, with a high affinity towards bottom trawlers. Model results showed D. delphis distribution to be associated to (shallow) water depths, though the factors driving their limited latitudinal distribution currently remain unknown. It is evident that T. truncatus and D. delphis are present in segregated areas of the Israeli continental shelf and T. truncatus currently sustains a delicate balance with continuously shifting human activities, while the drivers of D. delphis distribution are more specified, yet still not fully understood.

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30

Cardenas, Juan Carlos, José Yáñez, Julio C. Reyes, and K. Van Waerebeek. "Nuevos registros de cetáceos para el archipiélago de Juan Fernández, Chile." Boletín Museo Nacional de Historia Natural 42 (December 28, 1991): 113–20. http://dx.doi.org/10.54830/bmnhn.v42.1991.414.

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Se presentan cuatro nuevos registros de cetáceos para el Archipiélago de Juan Fernández, correspondientes a delfín común (Delphinus delphis), ballena picuda de Cuvier (Ziphius cavirostris), delfín listado (Stenella coeruleoalba) y una ballena picuda (Mesoplodón sp.) El caso del delfín listado corresponde a la primera cita en aguas chilenas y a la observación más austral para el Pacífico suroriental.

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31

Flower, William Henry. "I. On the External Characters of two Species of British Dolphins (Delphinus delphis, Linn., and Delphinus tursio, Fabr.)." Transactions of the Zoological Society of London 11, no. 1 (July 7, 2010): 1–6. http://dx.doi.org/10.1111/j.1096-3642.1980.tb00343.x.

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32

Perryman, Wayne L., and Morgan S. Lynn. "IDENTIFICATION OF GEOGRAPHIC FORMS OF COMMON DOLPHIN (Delphinus delphis) FROM AERIAL PHOTOGRAMMETRY." Marine Mammal Science 9, no. 2 (April 1993): 119–37. http://dx.doi.org/10.1111/j.1748-7692.1993.tb00438.x.

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33

Jepson, Paul D., Robert Deaville, Karina Acevedo-Whitehouse, James Barnett, Andrew Brownlow, Robert L. Brownell Jr., Frances C. Clare, et al. "What Caused the UK's Largest Common Dolphin (Delphinus delphis) Mass Stranding Event?" PLoS ONE 8, no. 4 (April 30, 2013): e60953. http://dx.doi.org/10.1371/journal.pone.0060953.

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34

Churchill, Morgan, Jacob Miguel, Brian L. Beatty, Anjali Goswami, and Jonathan H. Geisler. "Asymmetry drives modularity of the skull in the common dolphin (Delphinus delphis)." Biological Journal of the Linnean Society 126, no. 2 (December 7, 2018): 225–39. http://dx.doi.org/10.1093/biolinnean/bly190.

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35

Jaber, J. R., J. Pérez, M. Arbelo, P. Herráez, A. Espinosa de los Monteros, F. Rodńguez, T. Fernández, and A. Fernández. "Immunophenotypic Characterization of Hepatic Inflammatory Cell Infiltrates in Common Dolphins (Delphinus delphis)." Journal of Comparative Pathology 129, no. 2-3 (August 2003): 226–30. http://dx.doi.org/10.1016/s0021-9975(03)00008-2.

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36

Monteiro, Sílvia S., Andreia T. Pereira, Élia Costa, Jordi Torres, Isabel Oliveira, Jorge Bastos-Santos, Helder Araújo, Marisa Ferreira, José Vingada, and Catarina Eira. "Bioaccumulation of trace element concentrations in common dolphins (Delphinus delphis) from Portugal." Marine Pollution Bulletin 113, no. 1-2 (December 2016): 400–407. http://dx.doi.org/10.1016/j.marpolbul.2016.10.033.

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37

Pascoe, P. L. "Size data and stomach contents of common dolphins, Delphinus delphis, near Plymouth." Journal of the Marine Biological Association of the United Kingdom 66, no. 2 (May 1986): 319–22. http://dx.doi.org/10.1017/s002531540004296x.

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INTRODUCTIONThe laboratory at Plymouth was notified of the capture of five dolphins in a commercial trawl on 9 December 1982, three of the specimens were living and therefore immediately released. The remaining two were brought to the laboratory, identified as Delphinus delphis Linnaeus, 1758, their size and sex were recorded and the stomachs removed for examination of their contents. The exact location of capture was not recorded, but is known to be within 40 miles of Plymouth.Reports of strandings of D. delphis collected by the British Museum (Natural History), (Harmer, 1914–27; Fraser, 1934, 1946, 1953, 1974) and more recent recorded sightings (Evans, 1980) show that the common dolphin is clearly not rare in British waters. Although the species has been recorded off all British coasts, sightings and strandings are concentrated off the south and south-west coasts of Britain and Ireland. The variation in their numbers and distribution both during this century and on a seasonal basis each year has been accounted for mainly by the fluctuation and movement of their food supply (Evans, 1980; Sheldrick, 1976).

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38

Caputo, M., PW Froneman, and S. Plön. "Common dolphin Delphinus delphis occurrence off the Wild Coast of South Africa." African Journal of Marine Science 42, no. 4 (October 1, 2020): 439–48. http://dx.doi.org/10.2989/1814232x.2020.1841676.

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39

Pycraft, W. P. "38. On the Genital Organs of a Female Common Dolphin (Delphinus delphis)." Proceedings of the Zoological Society of London 102, no. 3 (August 20, 2009): 807–12. http://dx.doi.org/10.1111/j.1096-3642.1932.tb01098.x.

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Borrell, A., and A. Aguilar. "Mother-Calf Transfer of Organochlorine Compounds in the Common Dolphin (Delphinus delphis)." Bulletin of Environmental Contamination and Toxicology 75, no. 1 (July 2005): 149–56. http://dx.doi.org/10.1007/s00128-005-0731-y.

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Berrow, Simon, Ronan Cosgrove, Ruth H. Leeney, Joanne O'Brien, David McGrath, Jeppe Dalgard, and Yves Le Gall. "Effect of acoustic deterrents on the behaviour of common dolphins (Delphinus delphis)." J. Cetacean Res. Manage. 10, no. 3 (February 15, 2023): 227–33. http://dx.doi.org/10.47536/jcrm.v10i3.639.

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Not all delphinids are similarly affected by acoustic deterrent devices (pingers). At-sea trials were carried out to assess a range of acoustic signals and deterrents on the behaviour of common dolphins. In initial tests two acoustic deterrent devices, which previously produced an evasive response by bottlenose dolphins, failed to elicit any similar behaviour in common dolphins. A new signal output device, which permitted a range of signals to be tested at various source levels and characteristics was subsequently developed but again no significant effects on the behaviour of common dolphins were observed. Two commercially available acoustic deterrents, which had deterred common dolphins in previous studies, produced an occasional mild evasive response. Significant modification of the signal type or source level may be more effective, but our results suggest that pingers, at their current state of development, may not provide a consistently effective deterrent signal for common dolphins.

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Kastelein, R. A., G. J. Macdonald, and P. R. Wiepkema. "A note on food consumption and growth of common dolphins (Delphinus delphis)." J. Cetacean Res. Manage. 2, no. 1 (April 1, 2000): 69–73. http://dx.doi.org/10.47536/jcrm.v2i1.490.

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Food consumption, body weight and body length were recorded in four female common dolphins (Delphinus delphis) at Marineland of New Zealand between 1974 and 1996. The study is based on historical data that were recorded for short-term husbandry purposes. The composition and caloric value of the diet sometimes varied from day to day. The food intake quantities should therefore be viewed as rough weight estimates of what wild conspecifics might eat (depending on their diet). Annual food intake of two dolphins increased to 3,300kg at around 12 years of age, after which it decreased, stabilising at around 2,200kg between the ages of 16 and 25 years. Annual food intake of the other two animals increased to 2,700kg at six/seven years of age, then declined and stabilised at around 2,100kg between the ages of seven/eight and 12 years. The weights of two of the animals were first recorded at the ages of seven and eight years. During the following 19 years, their body weight gradually increased by about 15kg. The other two animals grew from around 57kg at the age of two/three years to about 100kg at around 12 years of age. The two animals grew much in length when they were between two and eight years old. The other two animals appeared to have reached asymptotic length by 18 and 19 years of age when their length was measured for the first time. As body weight increased, daily food consumption as a percentage of body weight decreased. At a body weight of around 60kg, the dolphins consumed the equivalent of around 12% of their body weight per day. When body weight had reached around 100kg, daily consumption had fallen to around 6% of body weight.

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Karamitros, Grigorios, Georgios A. Gkafas, Ioannis A. Giantsis, Petros Martsikalis, Menelaos Kavouras, and Athanasios Exadactylos. "Model-Based Distribution and Abundance of Three Delphinidae in the Mediterranean." Animals 10, no. 2 (February 6, 2020): 260. http://dx.doi.org/10.3390/ani10020260.

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Monitoring of Delphinidae species population patterns in the Mediterranean Sea was carried out in a sequence of surveys employing different approaches. Data from seven-year surveys with small catamaran sailing boats were analyzed under model-based approaches. Density Surface Models were used to produce spatial distribution prediction of three Delphinidae species (Stenella coeruleoalba, Tursiops truncatus, and Delphinus delphis) in an extended study area covering much of the Mediterranean Sea. A classical distance sampling protocol was applied in order to calculate the detection probability of clusters. Static (depth, slope, distance from the coast, and distance from isobaths of 200 m) and nonstatic (sea surface temperature and chlorophyll) variables were used to predict the species distribution/abundance in a generalized additive model context. Stenella coeruleoalba was found to be the dominant species, with an extended distribution in the study area; its abundance was significantly affected by both depth and distance. Tursiops truncatus and Delphinus delphis illustrated a significant abundance correlation with depth and chlorophyll, respectively, while both species showed a robust longitude correlation. Our model pinpoints the significance of nondesigned transect line surveys, suggesting the importance of specific habitat areas for future monitoring and conservation aspects of marine mammals.

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Weir, Caroline R., Colin D. Macleod, and Susannah V. Calderan. "Fine-scale habitat selection by white-beaked and common dolphins in the Minch (Scotland, UK): evidence for interspecific competition or coexistence?" Journal of the Marine Biological Association of the United Kingdom 89, no. 5 (July 21, 2009): 951–60. http://dx.doi.org/10.1017/s0025315408003287.

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A decline in white-beaked dolphins Lagenorhynchus albirostris had been reported in the Minch (Scotland, UK) since the 1990s, coinciding with an increasing occurrence of short-beaked common dolphins Delphinus delphis. This has led to suggestions that rising seawater temperatures are causing D. delphis to out-compete and exclude L. albirostris in this region. A total of 793 km (66.3 hours) of survey data were collected in the Minch during August 2007, to examine fine-scale habitat selection by L. albirostris and D. delphis and investigate whether their ecological overlap is sufficient to result in interspecific competition and/or habitat partitioning. Ten sightings of L. albirostris (70 animals) were recorded in a relatively small spatial area in the northern Minch. In contrast, the eleven sightings of D. delphis (1486 animals) were more widely distributed. The relative abundance per 1/4 ICES rectangle ranged from 0.41 to 0.53 animals/km for L. albirostris and 0.13 to 6.68 animals/km for D. delphis. The mean group size and group body mass were higher for D. delphis than for L. albirostris indicating D. delphis as the dominant delphinid in the Minch during August. Lagenorhynchus albirostris occurred in waters significantly deeper and further from shore than D. delphis, suggesting interspecific differences in preferred habitat. Most dolphin schools were recorded as foraging/feeding. Behaviour and seabird associations indicated that the two species differed in diet and/or foraging strategy, with L. albirostris foraging sub-surface and D. delphis exhibiting surface-feeding with associated gannets Morus bassanus. This is consistent with published information on the stomach contents of Scottish animals. The results suggest that there are subtle differences in habitat selection and diet between these two species, which may enable L. albirostris and D. delphis to coexist in the Minch. Whether these differences result from niche partitioning arising from previous/ongoing interspecific competition or are the result of genuine differences in the habitat preferences of each species, remains unclear.

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Ford, John K. B. "First Records of Long-beaked Common Dolphins, Delphinus capensis, in Canadian Waters." Canadian Field-Naturalist 119, no. 1 (January 1, 2005): 110. http://dx.doi.org/10.22621/cfn.v119i1.88.

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The genus Delphinus has recently been determined to be comprised of two species, the Short-beaked Common Dolphin, D. delphis, and the Long-beaked Common Dolphin, D. capensis. D. delphis is regularly observed in eastern Canadian waters, but is known only from a single stranding in British Columbia. Two specimen records and a series of sightings of D. capensis in British Columbian waters during 1993-2003, detailed here, are the first for this species in Canada. D. capensis normally ranges only as far north as central California, and its abundance in those waters increases in association with warm-water oceanographic events. Although the species appears to be rare in British Columbia, future sightings during warm-water periods might be anticipated.

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Volep, E., A. R. Carroll, D. Strauss, J. O. Meynecke, and D. Kobashi. "Effect of environmental conditions on cetacean entanglements: a case study from the Gold Coast, Australia." Marine and Freshwater Research 68, no. 11 (2017): 1977. http://dx.doi.org/10.1071/mf16302.

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Entanglement of marine mammals in fishing gear is recognised worldwide and is a continuous management concern. Gill-net entanglement data from the Queensland Shark Control Program (QSCP) on the Gold Coast, Australia, from 1990 to 2012 were analysed in the present study. Environmental drivers that may affect entanglements of humpback whales (Megaptera novaeangliae) and common dolphins (Delphinus delphis) were selected. M. novaeangliae entanglements coincided with their annual migration, with the greatest occurrences in September. D. delphis were mostly entangled from March to November, with the greatest occurrences in June. For both species, entanglements primarily occurred when the wave height was between 0.5 and 1.25m, the wave power was between 0 and 5kWm–1 and the wind speed was between 12 and 19kmh–1. M. novaeangliae entanglements were significantly more likely to occur in low rainfall (<6mmh–1), and D. delphis entanglements were more likely to occur during spring tides. There was a correlation between entanglements and the position of the East Australian Current’s (EAC) maximum velocity, with 73% of M. novaeangliae entanglements and 79% of D. delphis entanglements occurring when the EAC’s maximum velocity was west (shoreward) of its average position at 154°E. The present study provides the first set of possible management intervention targets associated with environmental conditions.

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Pace, D. S., B. Mussi, J. G. Vella, and A. Vella. "Facts and outcomes of the Mediterranean short‐beaked common dolphin ( Delphinus delphis ) workshop." Aquatic Conservation: Marine and Freshwater Ecosystems 31, S1 (February 17, 2021): 5–7. http://dx.doi.org/10.1002/aqc.3549.

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O’Callaghan, Seán A., and Nick Massett. "Short-Beaked Common Dolphins (Delphinus delphis) Observed Bow-Riding Basking Sharks (Cetorhinus maximus)." Aquatic Mammals 46, no. 5 (September 15, 2020): 461–65. http://dx.doi.org/10.1578/am.46.5.2020.461.

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Long, J. H., D. A. Pabst, W. R. Shepherd, and W. A. McLellan. "Locomotor design of dolphin vertebral columns: bending mechanics and morphology of Delphinus delphis." Journal of Experimental Biology 200, no. 1 (January 1, 1997): 65–81. http://dx.doi.org/10.1242/jeb.200.1.65.

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The primary skeletal structure used by dolphins to generate the dorsoventral bending characteristic of cetacean swimming is the vertebral column. In the vertebral column of the saddleback dolphin Delphinus delphis, we characterize the static and dynamic mechanical properties of the intervertebral joints, describe regional variation and dorsoventral asymmetries in mechanical performance, and investigate how the mechanical properties are correlated with vertebral morphologies. Using a bending machine that applies an external load (N m) to a single intervertebral segment, we measured the resulting angular deformation (rad) of the segment in both dorsal extension and ventral flexion. Intervertebral segments from the thoracic, lumbar and caudal regions of the vertebral column were tested from five individuals. Using quasi-static bending tests, we measured the initial (low-strain) bending stiffness (N m rad-1) as a function of segment position, direction of bending (extension and flexion) and sequential cutting of intervertebral ligaments. We found that initial bending stiffness was significantly greater in the lumbar region than in adjacent thoracic and caudal regions, and all joints were stiffer in extension than is predicted (r2 = 0.554) by the length and width of the intervertebral disc and the length of the cranial vertebral body in the segment. Stiffness in flexion is predicted (r2 = 0.400) by the width of the nucleus pulposus, the length of the caudal vertebral body in the segment and the height of the transverse processes from the ventral surface of the vertebral body. We also performed dynamic bending tests on intervertebral segments from the lumbo-caudal joint and the joint between caudal vertebrae 7 and 8. Dynamic bending stiffness (N m rad-1) increases with increasing bending amplitude and is independent of bending frequency. Damping coefficient (kg m2 rad-2 s-1) decreases with increasing bending amplitude and frequency. Resilience (% energy return) increases from approximately 20% at low bending amplitudes (+/-0.6 degree) to approximately 50% at high bending amplitudes (+/-2.9 degrees). Based on these findings, the dolphin's vertebral column has the mechanical capacity to help control the body's locomotor reconfigurations, to store elastic energy and to dampen oscillations.

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Josue, Diaz-Delgado, Sierra Eva, Vela Ana Isabel, Dominguez Lucas, Andrada Marisa, Arbelo Manuel, and Fernandez Antonio. "Endocarditis Associated with Wohlfahrtiimonas chitiniclastica in a Short-beaked Common Dolphin (Delphinus delphis)." Journal of Wildlife Diseases 51, no. 1 (January 2015): 283–86. http://dx.doi.org/10.7589/2014-03-072.

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