Relevant bibliographies by topics / Dolphins

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Dolphins'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 August 2024

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Dolphins.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Dolphins"

1

Wright, Katherine A. "Decreased ability to acquire food of a captive deaf dolphin (Tursiops truncatus): Slower reaction times and lower success rates." SURG Journal 4, no. 2 (March 11, 2011): 63–70. http://dx.doi.org/10.21083/surg.v4i2.1253.

Full text
Abstract:
Oceanic anthropogenic noise, such as naval sonar, can cause temporary hearing loss in cetaceans, but it is not known to what extent hearing loss affects cetacean behaviours such as feeding. This study used a captive deaf Atlantic bottlenose dolphin (Tursiops truncatus) to test the hypothesis that hearing loss would decrease a dolphin’s ability to acquire food by preventing echolocation (using echoes to locate fish). Reaction time (time to acquire dropped fish) and success rate (percentage of successfully acquired fish) were measured for the deaf dolphin and for two dolphins with no known hearing disabilities at Dolphins Plus in Florida in May 2009. The deaf dolphin had a significantly slower mean reaction time and a significantly lower mean success rate than those of the two other dolphins. A hydrophone suggested that the deaf dolphin could not echolocate, and thus relied mainly on vision. The results illustrate that hearing loss can negatively affect a dolphin’s ability to acquire food. Therefore, sources and effects of dolphin hearing loss require further investigation in order to provide targets for anthropogenic noise levels.
APA, Harvard, Vancouver, ISO, and other styles
2

Rossbach, Kelly A., and Denise L. Herzing. "Inshore and offshore bottlenose dolphin (Tursiops truncatus) communities distinguished by association patterns near Grand Bahama Island, Bahamas." Canadian Journal of Zoology 77, no. 4 (September 15, 1999): 581–92. http://dx.doi.org/10.1139/z99-018.

Full text
Abstract:
Little is known about the behavior of offshore dolphin populations. Our purpose was to distinguish and describe stable social groups of bottlenose dolphins (Tursiops truncatus) between inshore and offshore West End, Grand Bahama Island (26°42'N, 79°00'W). Photoidentification was conducted from May to September, 1994 to 1996. A simple ratio index described association patterns between dolphins. Multidimensional scaling of association indices (n = 1711 dolphin pairs) distinguished two dolphin communities consisting of 28 dolphins (19 of known sex) found inshore and 15 dolphins (12 of known sex) found greater than or equal to 27 km offshore. Eight of the 15 offshore dolphins were opportunistically photographed in the same region between 1986 and 1990. The two communities were found at different water depths (Mann-Whitney U test, p < 0.01), over distinct bottom types (Kruskal-Wallis test, p < 0.01), and used different bottom-foraging strategies. Long-term site fidelity of up to 10 years and repeated dolphin associations of up to 8 years occurred greater than or equal to 27 km from shore. Dolphins sighted greater than or equal to 15 times averaged 48 associates (SD = 11, n = 28). A dolphin's closest associate was of the same gender 74% of the time. This study is the first to report long-term site fidelity and association patterns of bottlenose dolphins found far from shore.
APA, Harvard, Vancouver, ISO, and other styles
3

Platto, Sara, and Agathe Serres. "A Quantitative Assessment of Trainers-Dolphins’ Interactions in the Absence of Food Reward." Animals 13, no. 10 (May 16, 2023): 1651. http://dx.doi.org/10.3390/ani13101651.

Full text
Abstract:
All the studies that have considered the motivation of the dolphins to interact with their trainers as a possible welfare indicator have been carried out in facilities where the trainer-dolphin interactions (TDIs) sessions were reinforced with food. Therefore, in these specific circumstances, it was difficult to separate the motivation of the dolphins interacting with the trainers from the food drive. The current study aims to assess the interaction between the trainers and the dolphins in the absence of food rewards. The research was carried out at The Dolphin Reef (Eilat, Israel), a facility where the interaction between the trainers and 14 bottlenose dolphins of different sex and age classes did not involve food rewards. A total of 531 TDIs were recorded, with dolphins participating in 94.5% of the sessions and an average of three dolphins per session. The dolphins participated in a higher number and more frequently in the TDIs when toys were provided by the trainers. Diel and seasonal differences were also observed, with the dolphins participating more during the morning sessions and the neutral season. The latency of response of the dolphins to the presence of the trainers on the platform or in the water, whether or not advertised by the trainers’ signal (“call” or “no-call”), was very short (usually less than 1 min), and the dolphins often anticipated the beginning of the sessions by arriving at the trainers’ location before or upon the caretakers’ arrival (96% of the time). Individual differences in the participation in the TDIs were also recorded, which might be linked to both the dolphin’s health/welfare status or their personality. The current study shows that the separation of the TDIs from the food reward allows for a better understanding of the willingness of dolphins under human care to interact with their trainers. In addition, the results presented in this paper show that such TDIs are an important part of these dolphins’ lives, which suggests that these interactions might be an additional tool to improve the animals’ social environment and monitor their welfare.
APA, Harvard, Vancouver, ISO, and other styles
4

Rossi-Santos, Marcos R., Leonardo L. Wedekin, and Emygdio L. A. Monteiro-Filho. "Residence and site fidelity of Sotalia guianensis in the Caravelas River Estuary, eastern Brazil." Journal of the Marine Biological Association of the United Kingdom 87, no. 1 (February 2007): 207–12. http://dx.doi.org/10.1017/s0025315407055683.

Full text
Abstract:
Between April 2002 and April 2005, 210 estuarine dolphin groups were sighted, with 58 animals individually identified. Fifteen dolphins were photo-identified just once, while only two animals were sighted in 15 different months. Some individuals showed long-term residence (more than 3 y). Residence rates showed heterogeneity in the dolphin's permanence of the estuary, with 60% of the individuals with low numbers (<10) and only 7% showing high values for residence (maximum=45.9). Continued resightings of some dolphins support the regular use of the study area by the animals, despite some individuals that, after a long time without resightings were registered again. Individual range analysis showed that dolphins shared the same common area, the Caravelas River Estuary. A marked fluctuation in the number of photo-identified dolphins was observed in the study area, revealed by the high number of individuals with just a few resightings. The majority of the dolphins (60%) present a yearly residence pattern, as observed in other areas, suggesting that a few individuals show high fidelity for the area, while many other dolphins move constantly between different areas for unknown reasons.
APA, Harvard, Vancouver, ISO, and other styles
5

Degrati, Mariana, Silvana L. Dans, Griselda V. Garaffo, and Enrique A. Crespo. "Seabird and dolphin associations: do seabirds benefit from feeding in association with dusky dolphins in Patagonia?" Journal of the Marine Biological Association of the United Kingdom 94, no. 6 (August 7, 2013): 1147–53. http://dx.doi.org/10.1017/s0025315413000945.

Full text
Abstract:
The objective of this study was to describe associations between several species of seabirds and dusky dolphins. We investigated during what dolphin activities seabirds were most commonly associated, and the size of flock in relation to the number of dolphins in a group. Since both seabirds and dolphins may display different feeding strategies, we also investigated if benefits differed among seabird species. Data were collected in Golfo Nuevo (42°20′S65°00′W) on-board a research vessel between 2001 and 2008. A total of 224 mixed groups of seabirds were encountered during this study. The seabird–dolphin associations were mainly observed during dusky dolphin surface feeding. Shearwaters and kelp gulls were mainly observed in flocks that were associated with dolphins, while Magellanic penguins and cormorants were mainly observed without dolphins. Seabirds may be conditioned to the foraging strategy of dolphins, since birds are associated with dolphins only during dolphin surface feeding. This association probably helped seabirds to find prey, but there were no obvious benefits to dolphins.
APA, Harvard, Vancouver, ISO, and other styles
6

Park, Nam Kyu, and Yohan An. "Estimation of LNG Dolphin Capacity: Dolphins of Different Size in Republic of Korea." Journal of Marine Science and Engineering 10, no. 12 (December 19, 2022): 2031. http://dx.doi.org/10.3390/jmse10122031.

Full text
Abstract:
The LNG terminals are characterized by a large number of ships entering the port during the winter season due to the seasonality of rapidly increasing demand for heating. In winter, there is a shortage of dolphin jetty wharf (dolphins), which increases the waiting rate for ships. Therefore, there is a practical argument that dolphins should be additionally built to solve the ship standby problem. This study proposes the proper LNG handling capacity of a terminal with multiple dolphins of different size. Studies on calculating the LNG handling capacity of LNG terminal dolphins have been proposed by UNCTAD and Ministry of Transport of China (MTC). The formula-based calculation of LNG handling capacity has the advantage of being simple, but it has the disadvantage of not reflecting the actual operation. In this study, the proper LNG handling capacity is measured using a simulation method to overcome the limitations of formula-based calculation for Incheon port in South Korea. In order to check whether the method by simulation is justified, it is compared with the unloading capacity by the calculation formula. This study finds that the proper (or optimal) LNG handling capacity of Incheon port is determined by a dolphin occupancy of 49%, where the dolphin’s profits are maximized. As the results of simulation model, the proper (or optimal) loading capacity is 38.5 million m3 when dolphin occupancy is 49%. The capacity of individual dolphin is estimated at 17.0 million m3 for 70,000 DWT dolphin and 21.2 million m3 for 120,000 DWT dolphin, respectively. The main points of this study to use simulation model are as follows: First, the number of non-working days should be considered. Second, the optimal dolphin occupancy should be determined by finding the maximum profit point of using the pier. Third, if the size of the dolphin is different, an appropriate simulation will be implemented. Fourth, the data of the peak season should be analyzed. Finally, it should be checked whether the ship waiting rate is acceptable level or not.
APA, Harvard, Vancouver, ISO, and other styles
7

Martha Purwahita, Anak Agung Ayu Ribeka, Anak Agung Sagung Srikandi, I. Gusti Agung Budiasih, and I. Wayan Arka. "WISATA LUMBA-LUMBA DI PANTAI LOVINA DESA KALIBUKBUK, KABUPATEN BULELENG (STUDI KASUS ATRAKSI LUMBA-LUMBA DI HOTEL MELKA)." Forum Manajemen 20, no. 2 (August 23, 2022): 99–107. http://dx.doi.org/10.61938/fm.v20i2.481.

Full text
Abstract:
Dolphin tourist attraction at Lovina Beach is one of the attractions to see dolphins on the high seas which is able to attract tourists to visit, as well as being a tourist attraction in North Bali. The development of dolphin tourism attractions has been shown in the swimming pool, but the survival of the dolphins is threatened. This case study discusses the exploitation of dolphins at the Melka Excelsior Hotel. This study aims to identify and analyze problems related to the exploitation of dolphins. Dolphin tourism attractions have positive and negative impacts and follow-up is needed to enjoy safe and comfortable dolphin tourism, especially dolphin conservation. The research method used is the field observation method and literature study obtained from journals and the internet. The placement of dolphins in the pond due to conditions that are not in accordance with their natural habitat will have a direct impact on these mammals. The activity of this dolphin attraction is more directed towards exploitation so that the need for dolphin conservation for commercial purposes does not have a positive effect on the dolphins themselves and lacks attention to these mammals.
APA, Harvard, Vancouver, ISO, and other styles
8

Mujiyanto, Mujiyanto, Riswanto Riswanto, Dharmadi Dharmadi, and Wildan Ghiffary. "COMPOSITION AND DISTRIBUTION OF DOLPHIN IN SAVU SEA NATIONAL MARINE PARK, EAST NUSA TENGGARA." Indonesian Fisheries Research Journal 23, no. 2 (February 12, 2018): 55. http://dx.doi.org/10.15578/ifrj.23.2.2017.55-67.

Full text
Abstract:
Dolphins are one of the most interesting cetacean types included in family Delphinidae or known as the oceanic dolphins from genus Stenella sp. and Tursiops sp. Migration and abundance of dolphins are affected by the presence of food and oceanographic conditions. The purpose of this research is to determine the composition and distribution of dolphins in relation to the water quality parameters. Benefits of this research are expected to provide information on the relationship between distributions of the family Delphinidae cetacean (oceanic dolphins) and oceanographic conditions. The method for this research is descriptive exploratory, with models onboard tracking survey. Field observations were done in November 2015 and period of March-April 2016 outside and inside Savu Sea National Marine Park waters. The sighting of dolphin in November and March-April found as much seven species: bottlenose dolphin, fraser’s dolphin, pantropical spotted dolphin, risso’s dolphin, rough-toothed dolphin, spinner dolphin and stripped dolphin. The highest species distribution noted in the Savu Sea is spinner dolphin, pantropical spotted dolphin, rough-toothed dolphin and frazer’s dolphin. The existence of dolphins in Savu Sea is more related with sea surface temperature than others oceanographic parameters. This condition is suspected due to the influence of sea surface temperature to body temperature of dolphin especially for foraging activities. The habit of dolphin is more active around Sumba Island and Daratan Timor waters while in the evening the animal is usually going to Manggarai and Rote Ndao Islands waters to rest.
APA, Harvard, Vancouver, ISO, and other styles
9

Branstetter, Brian K., Rachel Brietenstein, Gavin Goya, Megan Tormey, Teri Wu, and James J. Finneran. "Spatial acuity of the bottlenose dolphin (Tursiops truncatus) biosonar system with a bat and human comparison." Journal of the Acoustical Society of America 151, no. 6 (June 2022): 3847–57. http://dx.doi.org/10.1121/10.0011676.

Full text
Abstract:
Horizontal angular resolution was measured in two bottlenose dolphins using a two-alternative forced-choice, biosonar target discrimination paradigm. The task required a stationary dolphin positioned in a hoop to discriminate two physical targets at a range of 4 m. The angle separating the targets was manipulated to estimate an angular discrimination threshold of 1.5°. In a second experiment, a similar two-target biosonar discrimination task was conducted with one free-swimming dolphin, to test whether its emission beam was a critical factor in discriminating the targets. The spatial separation between two targets was manipulated to measure a discrimination threshold of 6.7 cm. There was a relationship between differences in acoustic signals received at each target and the dolphin's performance. The results of the angular resolution experiment were in good agreement with measures of the minimum audible angle of both dolphins and humans and remarkably similar to measures of angular difference discrimination in echolocating dolphins, bats, and humans. The results suggest that horizontal auditory spatial acuity may be a common feature of the mammalian auditory system rather than a specialized feature exclusive to echolocating auditory predators.
APA, Harvard, Vancouver, ISO, and other styles
10

Avila, Isabel Cristina, Carolina Garcia, and Juan Carlos Bastidas. "A note on the use of dolphins as bait in the artisanal fisheries off Bahía Solano, Chocó, Colombia." J. Cetacean Res. Manage. 10, no. 2 (February 15, 2023): 179–82. http://dx.doi.org/10.47536/jcrm.v10i2.652.

Full text
Abstract:
Dolphin hunting for fishing bait in Bahía Solano, Chocó, Colombia, was evaluated during eight months, between July 2005 and April 2006. Interviews were conducted with 122 fishermen (18.2% of the registered fishermen in the zone), who cover at most 890km2 when fishing (approximately 2.3% of the Pacific Territorial Sea of Colombia), and data obtained from landings at a fishing company. Only fishermen using longlines (37.3%) confirmed using dolphins as bait. It was not possible to obtain additional information about date, specific location or dolphin species, but the most probable captured species were common bottlenose dolphin and pantropical spotted dolphin. Nine dolphins were killed during the study period (1.1 dolphins/month) and extrapolating these numbers to all fishermen using longlines in the region (250), 24 dolphins might have been taken during the study period (3 dolphins/month). Fish species caught using dolphin bait include Pacific bearded brotula, groupers and smooth-hound.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Dolphins"

1

Jennings, Jennifer L. "Mountain dolphins." Connect to this title online, 2008. http://etd.lib.clemson.edu/documents/1211389267/.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Reddy, Kasturi. "The reproduction biology of four species of South African dolphins." Thesis, Rhodes University, 1996. http://hdl.handle.net/10962/d1005441.

Full text
Abstract:
Seasonality of reproduction in common dolphins (Delphinus delphis), bottlenosed dolphins (Tursiops aduncus), striped dolphins (Stenella coeruleoalba) and humpbacked dolphins (Sousa chinensis) was examined using standard light microscope techniques. In the males four stages of testicular development could be identified. Individuals less than 2.26m in length and 105kg in mass had testes that contained small seminiferous tubules (0.048mm ± O.Olmm in diameter) and were classified either as juveniles (gonocytes present) or inactive (no gonocytes). Adults whose testes contained spermatozoa were said to be in late spermatogenesis while those whose testes contained no spermatids or spermatozoa were referred to as being in early spermatogenesis. In the males of D. delphis, T. aduncus and S. chinensis, late spermatogenesis occurred throughout the year and there was no significant difference in the monthly mean seminiferous tubule diameters (p > 0.05) within species. I conclude therefore that in these three species spermatogenesis is aseasonal. No conclusions about seasonality of spermatogenesis could be made for S. coeruleoalba owing to the small sample size. Large Graafian follicles occurred in the ovaries of all four species in most months of the year. However, the presence of Graafian follicles can not be taken as an indication of timing of reproduction since they may be remnants of follicles that have not yet degenerated. In D. delphis, T. aduncus and S. coeruleoalba luteal bodies (corpora albicans or corpora lutea) occurred in most months of the year. Active corpora lutea will be present in all months, in some members of the population, since gestation is approximately 12 months. The sperm structure of D. delphis was examined by scanning electron microscopy. The sperm of D. delphis is essentially similar to that described for two other species of Cetacea (Physeter catodon and Tursiops aduncus), having an ellipsoidally shaped head and a short mid-piece with nine mitochondria. The sperm dimensions for D. delphis were head length, 4.4pm; head width, 2.0pm and mid-piece length, 2.4pm. An analysis of foetal age in D. delphis showed that the majority of the foetuses were conceived in January with birth occurring the following summer (December), suggesting that reproduction is seasonal. Neonates of T. aduncus were found throughout the year suggesting aseasonal reproduction. Foetal material was not available for S. coeruleoalba and S. chinensis. Seasonality of reproduction in the four species of dolphins studied has been discussed in relation to feeding, migration and worldwide distribution of the species.
APA, Harvard, Vancouver, ISO, and other styles
3

Fleming, Kimberly Hoover. "The social structure, behavior, and occurrence of bottlenose dolphins in relation to shrimp trawlers in Southport, North Carolina /." Electronic version (PDF), 2004. http://dl.uncw.edu/etd/2004/flemingk/kimfleming.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Heinrich, Sonja. "Ecology of Chilean dolphins and Peale's dolphins at Isla Chloé, southern Chile /." St Andrews, 2006. http://hdl.handle.net/10023/365.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Heinrich, Sonja. "Ecology of Chilean dolphins and Peale's dolphins at Isla Chiloe, southern Chile." Thesis, University of St Andrews, 2006. http://hdl.handle.net/10023/365.

Full text
Abstract:
Information on the ecology of sympatric species provides important insights into how different animals interact with their environment, with each other, and how they differ in their susceptibility to threats to their survival. In this study habitat use and population ecology of Chilean dolphins (Cephalorhynchus eutropia) and sympatric Peale's dolphins (Lagenorhynchus australis) were investigated in the Chiloe Archipelago in southern Chile from 2001 to 2004. Distribution data collected during systematic boat-based sighting surveys revealed a distinct pattern of small-scale habitat partitioning, probably reflecting differences in foraging strategies and habitat preference. Chilean dolphins were sighted consistently in the same selected bays and channels in southern Chiloe. Peale's dolphins were distributed over wider areas, and were more frequently encountered in central Chiloe. Spatial overlap between both dolphin species and mariculture farms (for mussels and salmon) was extensive. Predictive habitat modelling using logistic regression in a model selection framework proved a useful tool to determine critical habitat from absence-presence data and enviromental parameters. Chilean dolphins preferred shallow waters (< 20 m) close to shore (< 500 m) with estuarine influence. Peale's dolphins also occurred predominantly in shallow nearshore waters, but preferred more exposed shores with sandy shoals and were found further from rivers and mussel farms than Chilean dolphins. Analysis of ranging and movement patterns revealed small-scale site fidelity and small ranging patterns of individually identifiable Chilean dolphins. Individuals differed in their site preference and range overlap suggesting spatial partitioning along environmental and social parameters within the population. Individual Peale's dolphins were resighted less regularly, showed only limited or low site fidelity and seemed to range beyond the boundaries of the chosen study areas. Mark-recapture methods applied to photo-identification data produced estimates of local population sizes of 59 Chilean dolphins (95% CI= 54 - 64) and 78 Peale's dolphins (95% CI= 65 - 95) in southern Chiloe, and 123 Peale's dolphins (95% CI= 97 - 156) in central Chiloe. An integrated precautionary approach to management is proposed based on scientific monitoring, environmental education in local schools, and public outreach to promote appropriate conservation strategies and ensure the dolphins' continued occupancy of important coastal habitat.
APA, Harvard, Vancouver, ISO, and other styles
6

Heithaus, Michael R. "Habitat use decisions by bottlenose dolphins (Tursiops aduncus) and tiger sharks (Galeocerdo cuvier) in a subtropical seagrass ecosystem." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/NQ61648.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Chen, Ing. "Population genetics of Risso's dolphins (Grampus griseus), Fraser's dolphins (Lagenodelphis hosei) and bottlenose dolphins (Tursiops spp.) in the North Pacific Ocean." Thesis, Durham University, 2016. http://etheses.dur.ac.uk/11590/.

Full text
Abstract:
Cetaceans are highly mobile mammals, but many species still exhibit degrees of population structure while inhabiting seemingly boundary-free open waters. Resource specialisation is hypothesized as one of the main drivers of population structure. Using multiple diploid and haploid genetic markers, this study reveals, for the first time, the population genetic structure of Risso’s dolphins, Fraser’s dolphins and common bottlenose dolphins in the tropical-temperate regions of the western North Pacific Ocean. For the Risso’s dolphins, the results showed that there are at least three populations in the North Pacific Ocean, by-and-large parallel to the existing biogeographic provinces; and the direction of gene flow corresponds with the direction of the mainstream currents. Mitochondrial DNA (mtDNA) data showed that the Pacific populations are genetically different from the three populations in the eastern North Atlantic Ocean and the Mediterranean Sea. For the Fraser’s dolphins, the genetic differentiation between Japanese and Philippine waters is consistent with the differentiation suggested in an earlier skull morphometric study. For the common bottlenose dolphins, the results suggested that there are at least four populations in the western and central North Pacific Ocean, and the differentiation appears to correspond to habitat types, resembling the scenario of inshore-offshore differentiation seen in other populations of the same species in other regions. The analysis also confirmed that there is no evident gene flow between the two “sister species”, the common bottlenose dolphin and the Indo-Pacific bottlenose dolphin (T. aduncus), occurring sympatrically in the region. The mtDNA data suggested that the Risso’s and Fraser’s dolphin populations in the western North Pacific experienced an episode of expansion in the last 10,000 years. Genetic diversity is high in most of the population examined in this study; however, a relatively low effective population size is found in some populations and that may require further conservation attention.
APA, Harvard, Vancouver, ISO, and other styles
8

Brensing, Karsten. "Approaches to the behavior of dolphins Tursiops truncatus during unstructured swim with dolphin programs." [S.l. : s.n.], 2004. http://www.diss.fu-berlin.de/2004/164/index.html.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Bishop, Amy Ruth. "Age, growth, reproduction and sexual dimorphism of the striped dolphin, Stenella coeruleoalba, off the south-east coast of southern Africa." Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1011600.

Full text
Abstract:
The striped dolphin, Stenella coeruleoalba, is an oceanic dolphin found worldwide in tropical to warm temperate waters. Globally populations are threatened through direct fishing, bycatch and pollution. Little is known about the life history of this species in South African waters and it is currently listed as ‘Data Deficient’ by the International Union for Conservation of Nature (IUCN). Critical to the conservation and management of this species is an understanding of basic life history parameters. For the present study, metadata and tissues from 101 stranded S. coeruleoalba along the south-east coast of southern Africa between 1969 and 2012 were analyzed to examine age and growth, male and female reproduction and sexual dimorphism. Age and growth were determined by counting the number of growth layer groups (GLG’s) present in their teeth. A von Bertalanffy growth curve gave the best fit to the data and indicated that physical maturity was reached around 21 years in males and 18 years in females. Additionally, asymptotic lengths were reached at 231cm and 224cm in males and females, respectively. The maximum ages obtained were 21 years for males and 20 years for females. Length at birth was estimated to be between 116cm and 119cm for males and between 112cm and 114cm for females. The reproductive status of the adult dolphins was assessed by histological and macroscopic analyses of gonadal tissue. Sexual maturity was attained before physical maturity in both sexes. The males reached sexual maturity between 8 and 12 years of age and between 209 and 224cm in total body length. The maximum combined testis weight comprised about 0.24% of the total body weight and sexual maturity was reached between a combined testis weight of 16 and 41g, a mean testis length of 8 and 10cm, and a mean seminiferous tubule diameter of 44 and 70μm. Females attained sexual maturity between 7 and 8 years of age and between 213 and 216 cm in total body length. The ovulation rate was 0.32 per year and the majority of ovulations occurred in the left ovary, with ovulations occurring in the right ovary only in individuals older than 10 years of age. The annual pregnancy rate was calculated to be 26%. Reproductive seasonality could not be established due to the small sample size and the absence of samples throughout the year. However, both conceptions and births appear to occur in both August and December/January. Additionally, testis weight and seminiferous tubule diameters appear to fluctuate throughout the year, which could suggest reproductive seasonality in this species. Sexual size dimorphism in mature adults was evident for a number of external measurements, however, sexual shape dimorphism was not present in this species. Mature males had significantly longer and wider pectoral fins, dorsal fins and flukes than females (p<0.05 in all cases). It was suggested that the larger appendages are required for male on male combat during intraspecific competition for females. Additionally, larger appendages aid in thermoregulation, propulsion and maneuverability. Females had a significantly greater distance between the tip upper jaw and the genital aperture and anus, which was expected due to differences in anatomy between male and female genital openings. Overall, S. coeruleoalba did not exhibit distinct sexual dimorphism and together with the relatively small testes in relation to the total body weight (0.24%) it was proposed that this species demonstrates a less extreme form of polygyny. Additionaly, the results of this study are important to the understanding of the basic biology of the species.
APA, Harvard, Vancouver, ISO, and other styles
10

Fortuna, Caterina Maria. "Ecology and conservation of bottlenose dolphins (Tursiops truncatus) in the north-eastern Adriatic Sea." Thesis, St Andrews, 2007. http://hdl.handle.net/10023/157.

Full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Dolphins"

1

Society, Cousteau, ed. Dolphins. New York: Little Simon, 1992.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

Corrigan, Patricia. Dolphins: Dolphin magic for kids. Milwaukee, Wis: Gareth Stevens Pub., 1995.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Loh-Hagan, Virginia. Discover bottlenose dolphins. Ann Arbor, Michigan: Cherry Lake Publishing, 2016.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

Rake, Jody Sullivan. Bottlenose dolphins up close. Mankato, Minn: Capstone Press, 2009.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Riggs, Kate. Dolphins. Mankato, MN: Creative Paperbacks, 2015.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

Skog, Jason. Dolphins. Mankato, MN: Creative Education, 2009.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

Herriges, Ann. Dolphins. Minneapolis, MN: Bellwether Media, 2007.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

Simon, Seymour. Dolphins. New York, NY: Collins, 2009.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

1947-, Kalman Bobbie, ed. Dolphins. New York, N.Y: Crabtree Pub. Co., 1995.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

illustrator, Blasius Diane, ed. Dolphins. New York: McGraw-Hill School Division, 2002.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "Dolphins"

1

Neri, Alessandra, Cecilia Mancusi, Letizia Marsili, Paolo Sartor, and Alessandro Voliani. "Stomach contents of bottlenose dolphin Tursiops truncatus (Montagu, 1821): first results from specimens stranded in the Tuscan Archipelago in the period 1990–2021." In Ninth International Symposium “Monitoring of Mediterranean Coastal Areas: Problems and Measurement Techniques”, 738–46. Florence: Firenze University Press, 2022. http://dx.doi.org/10.36253/979-12-215-0030-1.70.

Full text
Abstract:
Bottlenose dolphin Tursiops truncatus (Montagu, 1821) is a cosmopolitan species; it is found in all tropical and temperate coastal waters of the world. The bottlenose dolphins in the Mediterranean Sea mainly show coastal habits, which often lead it to interact with fishing activities. In this study, first data on the diet of specimens of T. truncatus stranded in Tuscany, north-western Mediterranean, are provided. The stomachs contents of thirty-five bottlenose dolphins were analysed; this allowed characterising the main aspects of the trophic spectrum of this coastal cetacean.
APA, Harvard, Vancouver, ISO, and other styles
2

da Silva, Vera M. F., and Lucas G. Spinelli. "Play, Sexual Display, or Just Boredom Relief?" In Sex in Cetaceans, 153–71. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-35651-3_8.

Full text
Abstract:
AbstractCetaceans use objects and interact with conspecifics for play and socializing, often exhibiting complex behaviors that we do not understand. A few seconds of activity on the water’s surface rarely indicates intraspecific behaviors and interactions. What has already been described chiefly for common bottlenose dolphins (Tursiops truncatus) has been extrapolated to other species, with little information on river dolphins despite their accessibility. In this chapter, we review what is known about sexually related behaviors in different contexts, such as learning, play, sexual display, aggression, and boredom (weariness and restlessness through a lack of interest) among cetacean species, especially the Amazon river dolphin (Inia geoffrensis).
APA, Harvard, Vancouver, ISO, and other styles
3

Crow. "Design approach for flexible dolphin design." In Flexible Dolphins, 121–44. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003175001-6.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Crow. "Introduction." In Flexible Dolphins, 9–10. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003175001-1.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Crow. "Design aspects and methods." In Flexible Dolphins, 21–84. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003175001-3.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Crow. "Evaluation of design methods." In Flexible Dolphins, 85–100. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003175001-4.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Crow. "Construction aspects." In Flexible Dolphins, 145–62. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003175001-7.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Crow. "Sustainability." In Flexible Dolphins, 177–80. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003175001-9.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Crow. "Lessons Learned." In Flexible Dolphins, 181–90. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003175001-10.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Crow. "Special design conditions for dolphins." In Flexible Dolphins, 101–20. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003175001-5.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Dolphins"

1

Li, Rijie, Jiajun Chen, Yushen Huang, Liwei Liu, and Xianzhou Wang. "Numerical Simulation of Hydrodynamic Performance of Dolphin Fluke Motion." In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-77472.

Full text
Abstract:
The dolphins’ cruising, generally, with an extremely high thrust efficiency and low drag, which attracted many researchers’ wide attention. It is hoped that we can improve the hydrodynamic performance of underwater vehicle by studying the thrust characteristics of dolphin’s kick and the relationship between the formation of vortex and the thrust generation. However, previous work is mostly focused on investigation of hydrodynamic performance of dolphin fluke motion with a rigid tail which means that the locomotion of caudal fin is defined only by the oscillating motion, without the chordwise deformation. In this paper, the dolphin’s fluke motion is realized by a flexible caudal fin which is defined by a combination of oscillating motion and chordwise deformation. The simulation of the dolphin fluke motion is achieved by STRA-CCM, and dynamic moving mesh is implemented for different stroke functions. This paper primarily analyzed the thrust characteristics and the formation of vortex of dolphin fluke motion, then compared with the available data from previous work with rigid tail. It can be found that the structure of the vortex generated by the dolphin fluke motion with flexible caudal fin is different from a rigid one. Finally, by analyzing the instantaneous flow condition behind the dolphin caudal fin, it can get the reason why the thrust generated by the flexible caudal fin is larger than rigid one.
APA, Harvard, Vancouver, ISO, and other styles
2

Namba, Yasuhiro, Shunji Kato, Masami Iwai, Hiroshi Sato, Kentaroh Kokubun, and Sotaro Masanobu. "Prediction of Cumulative Fatigue Damage of Mooring Dolphins." In ASME 2004 23rd International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2004. http://dx.doi.org/10.1115/omae2004-51362.

Full text
Abstract:
Very Large Floating Structures, so-called Mega-Floats, are the kind of social infrastructures. They are generally expected to keep their integrity for a long period, for example, more than 100 years. So, it is necessary to develop Long-Term Integrity Prediction and Diagnosis System to diagnose the soundness of Mega-Floats. In the present study, we paid our attention to dolphin-fender type mooring devices that pontoon type VLFS are equipped with. As a part of Long-Term Integrity Prediction and Diagnosis System, we developed a long-term integrity prediction code (Cumulative Fatigue Damage Prediction Code) to predict damage of these dolphins. We made an at-sea experiment with pontoon type VLFS model of 201.5 [m] length, 100 [m] breadth, and 3 [m] depth (We call this “At-Sea Experiment for Verifying Functions of Mega-Float Information Data Center”). The model had two dolphin-fender type mooring devices and we applied Cumulative Fatigue Damage Prediction Code to these devices.
APA, Harvard, Vancouver, ISO, and other styles
3

Kurihara, Tsuneya. "Artificial dolphins." In ACM SIGGRAPH 96 Visual Proceedings: The art and interdisciplinary programs of SIGGRAPH '96. New York, New York, USA: ACM Press, 1996. http://dx.doi.org/10.1145/253607.253656.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Watanabe, Yoshiyasu. "Behaviors of a Very Large Floating Structure Supported With Dolphins Under Earthquake Loading." In ASME 2003 22nd International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2003. http://dx.doi.org/10.1115/omae2003-37160.

Full text
Abstract:
In recent years, tremendous research efforts have been directed toward developing very large floating structures (VLFSs) for the purposes of airports, terminals etc. on the sea to utilize ocean space. There is a VLFS which has a pontoon type structure supported with many dolphins and it is important to investigate sufficiently the behaviors of such VLFSs under earthquake loading, because large reaction forces will be exerted on the dolphins and fenders that connect the dolphins and the floating structure. This paper reports the results of the time history response analyses of a VLFS supported with dolphins with varying the period and velocity of the applied sinusoidal waves as an earthquake loading when gaps between fenders and dolphins are equal to zero. In the analyses, the floating structure supported with dolphins is modeled as a horizontally elastic plate and a rigid plate both supported with springs and dashpots through gap elements.
APA, Harvard, Vancouver, ISO, and other styles
5

Watanabe, Yoshiyasu. "Behaviors of a Very Large Floating Structure Supported With Dolphins Under Earthquake Loading: The Second Report — In Cases of Actual Earthquake Wave and Existence of Gaps Between Fenders and Dolphins." In 25th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/omae2006-92065.

Full text
Abstract:
In recent years, tremendous research efforts have been directed toward developing very large floating structures (VLFSs) for the purposes of airports, terminals etc. on the sea to utilize ocean space. There is a VLFS which has a pontoon type structure supported with many dolphins and it is important to investigate sufficiently the behaviors of such VLFS under earthquake loading, because large reaction forces will be exerted on the dolphins and fenders that connect the dolphins and the floating structure. The preceding paper reported the behaviors of the floating structure, fenders and dolphins obtained from the time history response analyses of the structure with varying the period and velocity of the sinusoidal earthquake wave, when the horizontal rigidity of the floating structure was elastic and rigid and when the gaps between the fenders and dolphins were assumed to be zero. This paper reports, succeeding to the preceding paper, the results of the time history response analyses of a VLFS supported with 49 dolphins with varying the period and velocity of the applied actual earthquake wave in both cases where gaps between the fenders and dolphins are equal to zero and non-zero. In the analyses, the floating structure supported with dolphins is modeled as both a horizontally elastic and rigid plate supported with linear springs and dashpots through gap elements.
APA, Harvard, Vancouver, ISO, and other styles
6

Moharrami, Mohammad Reza, Ehssan Zargar, and Mahdi Mirzaei. "An Investigation on Nonlinear Effects of Gaps in Dolphin Structures Analysis." In ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/omae2010-21030.

Full text
Abstract:
Dolphins are essential structures used in gas and oil terminals for berthing and mooring purposes. In essence, design of these structures is mostly based on linear analysis, so that the effect of nonlinearity on the actual responses is not considered. In this paper, the effect of nonlinearity caused by the gap modeling between parts of the structure is investigated and the modeling is carried out using accurate and efficient finite element software. As a case study, a mooring dolphin located in the Persian Gulf is simulated in order to demonstrate the nonlinear analysis effects. In contrary to the most common mooring dolphins, the dolphin is designed to have flexible structural behavior. As a result, it is comprised of three short piles connected by a triangle-shape box girder from the top. The box girder is composed of two triangle plates as flanges, which are connected by means of vertical stiffeners acting as web. Besides, three torsion bars are used to change the direct shear to a torsion shear to get a more efficient force transmission. In the piles-box girder connection, where piles pass through the holes prepared in the flanges, there is a considerable difference between the diameter of piles and holes as a tolerance (gap) for construction and codes provisions (BS 6349). The nonlinear effects are mainly caused by the gap in this connection besides the vertical supports of the box girder and the torsion bars. This paper contains the results of a nonlinear static analysis in which the gap between different parts is modeled using nonlinear spring elements to reach a convergence in solving the equations. Results are then compared with the linear static analysis of a similar dolphin, which gaps are not modeled in it and nonlinear effects are presented.
APA, Harvard, Vancouver, ISO, and other styles
7

Shaeffer, R. E., and Hugh Bradford Nicholson. "Structure for Twelve Dolphins." In Structures Congress 2006. Reston, VA: American Society of Civil Engineers, 2006. http://dx.doi.org/10.1061/40889(201)187.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Bruijn, E., J. D. Terpstra, A. M. Gresnigt, and W. F. Molenaar. "Plastic Design of Flexible Breasting Dolphins." In ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2005. http://dx.doi.org/10.1115/omae2005-67552.

Full text
Abstract:
In the development of design methods for single-pile flexible dolphins used for the berthing of bulk carriers, the design stress has been gradually increased to the yield stress to employ the elastic energy absorption capacity of the pile more optimally. In recent guidelines, e.g. EAU 1996 [3] and PIANC 2002 [5], also the plastic yielding capacity is implicitly or explicitly included in the ultimate load-bearing capacity. This movement towards plastic design is not accompanied by the development of calculation models and design criteria to assess the plastic load-bearing capacity and relevant failure modes such as local buckling and ovalisation of the cross-section. To investigate the nonlinear load-deflection behaviour of a dolphin, a numerical model was developed based on the Beam on Nonlinear Winkler Foundation (BNWF) method [7] and extended for the plastic range of the steel pile using plasticity theory, which has been verified and confirmed by FEM analysis. The resulting Bruijn model enables the assessment of the elastic and plastic load-bearing capacity in terms of energy absorption including all significant failure modes, resulting in an improved assessment of the safety against failure and allowing more optimal designs. Case study calculations with the Bruijn model show that buckling, and to a lesser degree ovalisation, are significant failure modes for a diameter-wall thickness (D/t) ratio of 62 and 83, and should therefore be included in the design guidelines. The use of the plastic yielding capacity is limited to a low diameter-wall thickness ratio (about 40), where an increase in the elastic energy absorption capacity of up to 1,37 times the original elastic energy absorption capacity can be obtained after some plastic yielding. At a larger D/t ratio the buckling sensitivity reduces the advantages of plastic design.
APA, Harvard, Vancouver, ISO, and other styles
9

Wang, Junshi, Vadim Pavlov, Zhipeng Lou, and Haibo Dong. "Computational Investigation of Thrust Production of a Dolphin at Various Swimming Speeds." In ASME 2021 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/fedsm2021-65792.

Full text
Abstract:
Abstract Dolphins are known for their outstanding swimming performance. However, the difference in flow physics at different speeds remains elusive. In this work, the underlying mechanisms of dolphin swimming at three speeds, 2 m/s, 5 m/s, and 8 m/s, are explored using a combined experimental and numerical approach. Using the scanned CAD model of the Atlantic white-sided dolphin (Lagenorhynchus acutus) and virtual skeleton-based surface reconstruction method, a three-dimensional high-fidelity computational model is obtained with time-varying kinematics. A sharp-interface immersed-boundary-method (IBM) based direct numerical simulation (DNS) solver is employed to calculate the corresponding thrust production, wake structure, and surface pressure at different swimming speeds. It is found that the fluke keeps its effective angle of attack at high values for about 60% of each stroke. The total pressure force coefficient along the x-axis converges as the speed increase. The flow and surface pressure analysis both show considerable differences between lower (2 m/s) and higher (5 m/s and 8 m/s) speeds. The results from this work help to bring new insight into understanding the force generation mechanisms of the highly efficient dolphin swimming and offer potential suggestions to the future designs of unmanned underwater vehicles.
APA, Harvard, Vancouver, ISO, and other styles
10

Zorikov and Dubrovsky. "Echo-processing procedure in bottlenose dolphins." In Oceans 2003. Celebrating the Past ... Teaming Toward the Future. IEEE, 2003. http://dx.doi.org/10.1109/oceans.2003.178577.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Dolphins"

1

Jazmin Garcia, Jazmin Garcia. Human Impacts on Bottlenose Dolphins in Belize. Experiment, December 2014. http://dx.doi.org/10.18258/4151.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Joshua D. McInnes, Joshua D. McInnes. Population Ecology of Risso's Dolphins in Monterey Bay, California. Experiment, April 2018. http://dx.doi.org/10.18258/11114.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Holt, Marla M., Dawn P. Noren, and Terrie M. Williams. The Metabolic Cost of Click Production in Bottlenose Dolphins. Fort Belvoir, VA: Defense Technical Information Center, September 2012. http://dx.doi.org/10.21236/ada573487.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Williams, Terrie M. Dolphins as Models for Cost Efficient Autonomous Underwater Vehicles. Fort Belvoir, VA: Defense Technical Information Center, March 2000. http://dx.doi.org/10.21236/ada390058.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Holt, Marla M., Dawn P. Noren, and Terrie M. Williams. The Metabolic Cost of Click Production in Bottlenose Dolphins. Fort Belvoir, VA: Defense Technical Information Center, September 2014. http://dx.doi.org/10.21236/ada616390.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Houser, Dorian S., James J. Finneran, and Laura Yates. Behavioral Response of Dolphins to Signals Simulating Mid-Frequency Sonar. Fort Belvoir, VA: Defense Technical Information Center, September 2010. http://dx.doi.org/10.21236/ada541587.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Au, W. W., and D. L. Herzing. Real - Time Acquisition of Echolocation Signals by Wild Atlantic Spotted Dolphins. Fort Belvoir, VA: Defense Technical Information Center, November 1997. http://dx.doi.org/10.21236/ada362339.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Samuels, Amy. A Systematic Approach to Measuring the Social Behavior of Bottlenose Dolphins. Fort Belvoir, VA: Defense Technical Information Center, September 1996. http://dx.doi.org/10.21236/ada330452.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Branstetter, Brian K. Auditory Masking Patterns in Bottlenose Dolphins from Anthropogenic and Natural Noise Sources. Fort Belvoir, VA: Defense Technical Information Center, September 2012. http://dx.doi.org/10.21236/ada573319.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Fair, Patricia A., and Gregory D. Bossart. Pathophysiology of Stress in Wild and Managed-Care Bottlenose Dolphins (Tursiops truncatus). Fort Belvoir, VA: Defense Technical Information Center, September 2012. http://dx.doi.org/10.21236/ada578414.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Dolphins' for particular source types:
Journal articles Dissertations / Theses Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography