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1

Thorpe, C. William, Richard H. T. Bates, and Stephen M. Dawson. "Intrinsic echolocation capability of Hector’s dolphin, Cephalorhynchus hectori." Journal of the Acoustical Society of America 90, no. 6 (December 1991): 2931–34. http://dx.doi.org/10.1121/1.401767.

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2

Cavagnaro, Laura, Kenneth Baldwin, and Gregory Stone. "Hector’s dolphin (Cephalorhynchus hectori) vocalizations and gillnet pingers." Journal of the Acoustical Society of America 108, no. 5 (November 2000): 2636. http://dx.doi.org/10.1121/1.4743814.

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3

Brough, T., W. Rayment, E. Slooten, and S. Dawson. "Spatiotemporal distribution of foraging in a marine predator: behavioural drivers of hotspot formation." Marine Ecology Progress Series 635 (February 6, 2020): 187–202. http://dx.doi.org/10.3354/meps13198.

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Many species of marine predators display defined hotspots in their distribution, although the reasons why this happens are not well understood in some species. Understanding whether hotspots are used for certain behaviours provides insights into the importance of these areas for the predators’ ecology and population viability. In this study, we investigated the spatiotemporal distribution of foraging behaviour in Hector’s dolphin Cephalorhynchus hectori, a small, endangered species from New Zealand. Passive acoustic monitoring of foraging ‘buzzes’ was carried out at 4 hotspots and 6 lower-use, ‘reference areas’, chosen randomly based on a previous density analysis of visual sightings. The distribution of buzzes was modelled among spatial locations and on 3 temporal scales (season, time of day, tidal state) with generalised additive mixed models using 82000 h of monitoring data. Foraging rates were significantly influenced by all 3 temporal effects, with substantial variation in the importance and nature of each effect among locations. The complexity of the temporal effects on foraging is likely due to the patchy nature of prey distributions and shows how foraging is highly variable at fine scales. Foraging rates were highest at the hotspots, suggesting that feeding opportunities shape fine-scale distribution in Hector’s dolphin. Foraging can be disrupted by anthropogenic influences. Thus, information from this study can be used to manage threats to this vital behaviour in the locations and at the times where it is most prevalent.
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4

Thorpe, C. William, and Stephen M. Dawson. "Automatic measurement of descriptive features of Hector’s dolphin vocalizations." Journal of the Acoustical Society of America 89, no. 1 (January 1991): 435–43. http://dx.doi.org/10.1121/1.400477.

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5

Seabrook-Davidson, Mark N. H., and Dianne H. Brunton. "Public attitude towards conservation in New Zealand and awareness of threatened species." Pacific Conservation Biology 20, no. 3 (2014): 286. http://dx.doi.org/10.1071/pc140286.

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A survey was conducted amongst a sample (n = 3 000) of the New Zealand public to gauge their perception of government spending on conservation. The survey also obtained an understanding of the level of awareness the public has of New Zealand threatened species. Respondents ranked eight areas of government spending, namely health, education, superannuation, law and order, defence, conservation of native species, primary industry research & development and tourism. From a response rate of n = 131 (4.5%), health and education were ranked the highest, followed by law and order with conservation in fourth position. Except for conservation of native species, these rankings by respondents closely aligned with priorities of average annual government spending. Awareness was the highest for endemic species such as kiwi Apteryx spp, Hector’s dolphin Cephalorhynchus hectori, kokako Callaeas cinerea cinerea, kakapo Strigops habroptilus, takahe Porphyrio mantelli, Maui’s dolphin Cephalorhynchus hectori maui and tuatara Sphenodon punctatus. The awareness for these prominent species may suggest that the Department of Conservation is achieving some success in its advocacy role to increase the public’s awareness of species threatened with extinction. With awareness of threatened species and the moderate ranking given to conservation expenditure, it is evident there is a level of public support for expenditure on protection of biodiversity and natural heritage.
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6

Pichler, F. B., S. M. Dawson, E. Slooten, and C. S. Baker. "Geographic Isolation of Hector’s Dolphin Populations Described by Mitochondrial DNA Sequences." Conservation Biology 12, no. 3 (July 7, 2008): 676–82. http://dx.doi.org/10.1111/j.1523-1739.1998.96390.x.

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7

Conroy, Michael J., Richard J. Barker, Peter W. Dillingham, David Fletcher, Andrew M. Gormley, and Ian M. Westbrooke. "Application of decision theory to conservation management: recovery of Hector's dolphin." Wildlife Research 35, no. 2 (2008): 93. http://dx.doi.org/10.1071/wr07147.

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Decision theory provides an organised approach to decision making in natural resource conservation. The theory requires clearly stated objectives, decision alternatives and decision-outcome utilities, and thus allows for the separation of values (conservation and other societal objectives) from beliefs. Models express belief in the likely response of the system to conservation actions, and can range from simple, graphical representations to complex computer models. Models can be used to make predictions about likely decision-outcomes, and hence guide decision making. Decision making must account for uncertainty, which can be reduced but never eliminated. Uncertainty can be described via probabilities, which in turn can be used to compute the expected value of alternative decisions, averaging over all relevant sources of uncertainty. Reduction of uncertainty, where possible, improves decision making. Adaptive management involves the reduction of uncertainty via prediction under two or more alternative, structural models, comparison of model predictions to monitoring, and feedback via Bayes’ Theorem into revising model weights, which in turn influences decision making. As part of a 3-day workshop on structured decision making (SDM) and adaptive resource management (ARM), we constructed a prototypical decision model for the recovery for Hector’s dolphin (Cephalorynchus hectori), an endangered dolphin endemic to New Zealand coastal waters. Our model captures several steps in the process of building an SDM/ARM framework, and should be useful for managers wishing to apply these principles to dolphin conservation or other resources problems.
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8

Middleton, DAJ, PJ Starr, and DJ Gilbert. "Modelling the impact of fisheries bycatch on Hector’s dolphin: comment on Slooten (2007)." Endangered Species Research 3 (December 11, 2007): 331–34. http://dx.doi.org/10.3354/esr00057.

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9

S. Stone, Gregory, and Austen Yoshinaga. "Hector's Dolphin Cephalorhynchus hectori calf mortalities may indicate new risks from boat traffic and habituation." Pacific Conservation Biology 6, no. 2 (2000): 162. http://dx.doi.org/10.1071/pc000162.

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Two Hector's Dolphin calves Cephalorhynchus hectori were killed by probable boat collision in 1999, indicating that boat strikes may pose more of a threat to the species than previously thought. When discovered, one dead calf was still tended by its mother. After recovery, both animals were necropsied with trauma from boat strikes as the most likely cause of death. These deaths are discussed in the context of increasing human contact with Hector's Dolphins in Akaroa Harbour, and risks to the dolphins caused by this habituation.
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10

Slooten, Elisabeth, and Frank Lad. "Population biology and conservation of Hector's dolphin." Canadian Journal of Zoology 69, no. 6 (June 1, 1991): 1701–7. http://dx.doi.org/10.1139/z91-235.

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During the past decade, Hector's dolphins, Cephalorhynchus hectori, have suffered an alarming level of mortality due to entanglement in commercial and amateur gill nets. In this paper we study two Leslie matrix population models that incorporate known features of dolphin fertility and mortality, focussing on the information they provide regarding age distributions and maximum population growth rates. The simplest model specifies constant survival rates over many age-classes. The second model uses more realistic curves of age-specific survival rates. The results indicate that Hector's dolphin, like most other small cetaceans, has a low potential for population growth. Growth rates of 1.8–4.9% per year are likely to be the maximum possible for Hector's dolphin populations, and C. hectori (and C. commersonii) populations are likely to be declining under recent levels of net entanglement. Survival rate estimates from free-living populations, subject to natural and net-entanglement mortality, showed decreasing populations. Even with the most optimistic reproductive parameters, survival rates would need to be some 5–10% higher than those observed in populations subject to gill-net entanglement before population growth could occur. The likely consequences of a reduction in entanglement mortality through conservation management are explored using the survivorship curve model. These simulations show that the age structure of the population can have an important effect on changes in the size and growth rate of the population during the recovery phase following a reduction in entanglement mortality.
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11

Bräger, Stefan. "Association patterns in three populations of Hector's dolphin, Cephalorhynchus hectori." Canadian Journal of Zoology 77, no. 1 (July 1, 1999): 13–18. http://dx.doi.org/10.1139/z98-192.

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Most delphinids are very social and spend much time in the presence of conspecifics. The proportion of co-occurrences of any two individuals is usually measured by means of association indices. In this study, the "half-weight index" was used to describe the association patterns in three previously unstudied populations of Hector's dolphin, Cephalorhynchus hectori, around the South Island of New Zealand. For inclusion in this analysis individuals were photoidentified repeatedly over a 2-year study period. Only about 1% of the individual associations of dolphin pairs (dyads) tested were found to be significantly different (p less than or equal to 0.01) from random distributions derived from a new constrained Monte Carlo randomisation. The overall association patterns in the two study populations off Kaikoura ( n = 48 individuals) and Moeraki (n = 24) did not differ significantly from what could be expected by chance (p = 0.07 and 0.09, respectively), whereas those in the Jackson Bay population (n = 38) were significantly different from chance (p < 0.0002). Hector's dolphins appear to have a typical fission-fusion society, with many weak associations within the wider envelope of the local population.
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12

Rayment, William, Steve Dawson, and Liz Slooten. "Trialling an automated passive acoustic detector (T-POD) with Hector's dolphins (Cephalorhynchus hectori)." Journal of the Marine Biological Association of the United Kingdom 89, no. 5 (May 27, 2009): 1015–22. http://dx.doi.org/10.1017/s0025315409003129.

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Acoustic surveys can have several advantages over visual methods in surveys of cetaceans, although verification is required that novel techniques are effective. The T-POD is an autonomous acoustic data logger with inbuilt filters that can be set to match the click characteristics of the target species. We tested the performance of the T-POD for detecting Hector's dolphins at Flea Bay, Banks Peninsula, New Zealand. Simultaneous visual surveys were conducted from a hillside overlooking the bay, with distances between the T-POD and dolphins measured using a theodolite. Wideband sound recordings confirmed that T-POD detections were echolocation clicks made by Hector's dolphins. Detection probability and click train detection rate decreased with increasing distance, with no detections made beyond 500 m. By fitting detection functions to the probability of detection versus distance we showed that the T-POD effectively detected all dolphin groups within a radius of 198–239 m, depending on the click train categories utilized. The T-POD shows considerable promise as a tool for passive acoustic surveys of Hector's dolphins, with possible applications in studies of distribution, habitat use and echolocation behaviour.
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13

Buckle, Kelly, Wendi D. Roe, Laryssa Howe, Sarah Michael, Padraig J. Duignan, E. Burrows, Hye Jeong Ha, Sharon Humphrey, and Wendy L. McDonald. "Brucellosis in Endangered Hector’s Dolphins(Cephalorhynchus hectori)." Veterinary Pathology 54, no. 5 (May 11, 2017): 838–45. http://dx.doi.org/10.1177/0300985817707023.

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14

Slooten, Elisabeth. "Age, growth, and reproduction in Hector's dolphins." Canadian Journal of Zoology 69, no. 6 (June 1, 1991): 1689–700. http://dx.doi.org/10.1139/z91-234.

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Data are provided on the reproductive biology and life history of Hector's dolphin, Cephalorhynchus hectori, a species found only in New Zealand waters. Samples were taken from 60 dolphins found beach-cast or killed incidentally in fishing gear. Male and female reproductive tracts were examined macroscopically and histologically, and tooth sections provided an age estimate for each individual. The traditional procedure for preparing dolphin teeth was simplified by using a faster stain and more readily available embedding and sectioning equipment. An important advantage of this method is that it facilitates the cutting of thinner sections, increasing the chances of obtaining a section through the centre of the pulp cavity. Sectioning revealed an open pulp cavity in all the teeth examined. The maximum observed age was 19 years for females and 20 years for males. Females reach a larger body size than males, and are apparently larger than males at any given age. Males appear to reach sexual maturity between 6 and 9 years of age, whereas females give birth to their first calf at 7–9 years of age. Mature males have extremely large testes relative to their body size. The largest male found in this study weighed 41.5 kg, with testes (including epididymides) totalling 1.21 kg.
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15

Stockin, K. A., R. J. Law, W. D. Roe, L. Meynier, E. Martinez, P. J. Duignan, P. Bridgen, and B. Jones. "PCBs and organochlorine pesticides in Hector’s (Cephalorhynchus hectori hectori) and Maui’s (Cephalorhynchus hectori maui) dolphins." Marine Pollution Bulletin 60, no. 6 (June 2010): 834–42. http://dx.doi.org/10.1016/j.marpolbul.2010.01.009.

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16

Webster, Trudi A., Stephen M. Dawson, and Elisabeth Slooten. "Evidence of Sex Segregation in Hector's Dolphin (Cephalorhynchus hectori)." Aquatic Mammals 35, no. 2 (June 1, 2009): 212–19. http://dx.doi.org/10.1578/am.35.2.2009.212.

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17

Baker, Alan N., Adam N. H. Smith, and Franz B. Pichler. "Geographical variation in Hector's dolphin: Recognition of new subspecies ofCephalorhynchus hectori." Journal of the Royal Society of New Zealand 32, no. 4 (December 2002): 713–27. http://dx.doi.org/10.1080/03014223.2002.9517717.

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18

Bräger, Stefan, and Zsuzsanna Bräger. "Range Utilization and Movement Patterns of Coastal Hector’s Dolphins (Cephalorhynchus hectori)." Aquatic Mammals 44, no. 6 (November 15, 2018): 633–42. http://dx.doi.org/10.1578/am.44.6.2018.633.

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19

Bräger, Stefan. "Association patterns in three populations of Hector's dolphin, Cephalorhynchus hectori." Canadian Journal of Zoology 77, no. 1 (1999): 13–18. http://dx.doi.org/10.1139/cjz-77-1-13.

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20

Slooten, Elisabeth, Stephen M. Dawson, and Hal Whitehead. "Associations among photographically identified Hector's dolphins." Canadian Journal of Zoology 71, no. 11 (November 1, 1993): 2311–18. http://dx.doi.org/10.1139/z93-324.

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Associations among Hector's dolphins photographically identified in the waters off Banks Peninsula, New Zealand, were studied using cluster analyses of simple and half-weight association indices. In addition, we carried out a temporal analysis of association patterns, plotting changes in the standardized reassociation rate over time. Some individually identified Hector's dolphins were photographed in the study area in successive seasons and years, and appeared to be resident in the area. Social organization was characterized by relatively fluid association patterns, with little stability over periods longer than a few days. Both male and female Hector's dolphins interacted with a large number of other individuals, males more so than females. Association patterns and other evidence support the hypothesis that Hector's dolphins have a promiscuous mating system.
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21

Weir, JS, and O. Sagnol. "Distribution and abundance of Hector's dolphins (Cephalorhynchus hectori) off Kaikoura, New Zealand." New Zealand Journal of Marine and Freshwater Research 49, no. 3 (April 16, 2015): 376–89. http://dx.doi.org/10.1080/00288330.2015.1020502.

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22

Hamner, Rebecca M., Rochelle Constantine, Marc Oremus, Martin Stanley, Phillip Brown, and C. Scott Baker. "Long-range movement by Hector's dolphins provides potential genetic enhancement for critically endangered Maui's dolphin." Marine Mammal Science 30, no. 1 (March 7, 2013): 139–53. http://dx.doi.org/10.1111/mms.12026.

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23

Burkhart, Stephanie M., and Elisabeth Slooten. "Population viability analysis for Hector's dolphin (Cephalorhynchus hectori): A stochastic population model for local populations." New Zealand Journal of Marine and Freshwater Research 37, no. 3 (September 2003): 553–66. http://dx.doi.org/10.1080/00288330.2003.9517189.

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24

Webster, Trudi, Steve Dawson, and Elisabeth Slooten. "A simple laser photogrammetry technique for measuring Hector's dolphins (Cephalorhynchus hectori) in the field." Marine Mammal Science 26, no. 2 (April 2010): 296–308. http://dx.doi.org/10.1111/j.1748-7692.2009.00326.x.

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25

Martinez, Emmanuelle, Mark B. Orams, Matt D. M. Pawley, and Karen A. Stockin. "The use of auditory stimulants during swim encounters with Hector's dolphins (Cephalorhynchus hectori hectori) in Akaroa Harbour, New Zealand." Marine Mammal Science 28, no. 3 (September 29, 2011): E295—E315. http://dx.doi.org/10.1111/j.1748-7692.2011.00528.x.

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26

Hutton, J., D. Blair, E. Slooten, and SM Dawson. "Case studies of fluke-induced lesions in mesenteric lymph nodes of Hector's dolphins Cephalorhynchus hectori." Diseases of Aquatic Organisms 2 (1986): 83–86. http://dx.doi.org/10.3354/dao002083.

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27

Bejder, Lars, and Steve Dawson. "Abundance, residency, and habitat utilisation of Hector's dolphins (Cephalorhynchus hectori) in Porpoise Bay, New Zealand." New Zealand Journal of Marine and Freshwater Research 35, no. 2 (June 2001): 277–87. http://dx.doi.org/10.1080/00288330.2001.9516998.

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28

Roe, W. D., L. Howe, E. J. Baker, L. Burrows, and S. A. Hunter. "An atypical genotype of Toxoplasma gondii as a cause of mortality in Hector's dolphins (Cephalorhynchus hectori)." Veterinary Parasitology 192, no. 1-3 (February 2013): 67–74. http://dx.doi.org/10.1016/j.vetpar.2012.11.001.

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29

Rayment, William, and Trudi Webster. "Observations of Hector's dolphins (Cephalorhynchus hectori) associating with inshore fishing trawlers at Banks Peninsula, New Zealand." New Zealand Journal of Marine and Freshwater Research 43, no. 4 (December 2009): 911–16. http://dx.doi.org/10.1080/00288330909510049.

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30

Slooten, Elisabeth, and Stephen M. Dawson. "Assessing the effectiveness of conservation management decisions: likely effects of new protection measures for Hector's dolphin (Cephalorhynchus hectori)." Aquatic Conservation: Marine and Freshwater Ecosystems 20, no. 3 (May 2010): 334–47. http://dx.doi.org/10.1002/aqc.1084.

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31

Dawson, Stephen M. "INCIDENTAL CATCH OF HECTOR'S DOLPHIN IN INSHORE GILLNETS." Marine Mammal Science 7, no. 3 (July 1991): 283–95. http://dx.doi.org/10.1111/j.1748-7692.1991.tb00103.x.

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32

Slooten, E., and S. M. Dawson. "Sustainable Levels of Human Impact for Hector's Dolphin." Open Conservation Biology Journal 2, no. 1 (October 30, 2008): 37–43. http://dx.doi.org/10.2174/1874839200802010037.

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33

Heimeier, Dorothea, C. Scott Baker, Kirsty Russell, Pádraig J. Duignan, Alistair Hutt, and Gregory S. Stone. "Confirmed expression of MHC class I and class II genes in the New Zealand endemic Hector's dolphin (Cephalorhynchus hectori)." Marine Mammal Science 25, no. 1 (January 2009): 68–90. http://dx.doi.org/10.1111/j.1748-7692.2008.00244.x.

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34

Dawson, Stephen M., and C. William Thorpe. "A Quantitative Analysis of the Sounds of Hector's Dolphin." Ethology 86, no. 2 (April 26, 2010): 131–45. http://dx.doi.org/10.1111/j.1439-0310.1990.tb00424.x.

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35

Dawson, Stephen, Franz Pichler, Elisabeth Slooten, Kirsty Russell, and C. Scott Baker. "THE NORTH ISLAND HECTOR'S DOLPHIN IS VULNERABLE TO EXTINCTION." Marine Mammal Science 17, no. 2 (April 2001): 366–71. http://dx.doi.org/10.1111/j.1748-7692.2001.tb01278.x.

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36

Slooten, E. "Behavior of Hector's Dolphin: Classifying Behavior by Sequence Analysis." Journal of Mammalogy 75, no. 4 (November 18, 1994): 956–64. http://dx.doi.org/10.2307/1382477.

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37

Stone, Gregory S., Jenny Brown, and Austen Yoshinaga. "DIURNAL MOVEMENT PATTERNS OF HECTOR'S DOLPHIN AS OBSERVED FROM CLIFFTOPS." Marine Mammal Science 11, no. 3 (July 1995): 395–402. http://dx.doi.org/10.1111/j.1748-7692.1995.tb00295.x.

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38

Rayment, William, Deanna Clement, Steve Dawson, Elisabeth Slooten, and Eduardo Secchi. "Distribution of Hector's dolphin (Cephalorhynchus hectori) off the west coast, South Island, New Zealand, with implications for the management of bycatch." Marine Mammal Science 27, no. 2 (July 15, 2010): 398–420. http://dx.doi.org/10.1111/j.1748-7692.2010.00407.x.

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39

Bräger, Stefan, Stephen M. Dawson, Elisabeth Slooten, Susan Smith, Gregory S. Stone, and Austen Yoshinaga. "Site fidelity and along-shore range in Hector's dolphin, an endangered marine dolphin from New Zealand." Biological Conservation 108, no. 3 (December 2002): 281–87. http://dx.doi.org/10.1016/s0006-3207(02)00124-6.

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Martien, Karen K., Barbara L. Taylor, Elizabeth Slooten, and Steve Dawson. "A sensitivity analysis to guide research and management for Hector's dolphin." Biological Conservation 90, no. 3 (October 1999): 183–91. http://dx.doi.org/10.1016/s0006-3207(99)00020-8.

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41

Slooten, E., and N. Davies. "Hector's dolphin risk assessments: old and new analyses show consistent results." Journal of the Royal Society of New Zealand 42, no. 1 (September 29, 2011): 49–60. http://dx.doi.org/10.1080/03036758.2011.606820.

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42

Pichler, F. B., S. M. Dawson, E. Slooten, and C. S. Baker. "Geographic Isolation of Hector's Dolphin Populations Described by Mitochondrial DNA Sequences." Conservation Biology 12, no. 3 (June 17, 1998): 676–82. http://dx.doi.org/10.1046/j.1523-1739.1998.96390.x.

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43

Buckland, S. J., D. J. Hannah, J. A. Taucher, E. Slooten, and S. Dawson. "Polychlorinated dibenzo-p-dioxins and dibenzofurans in New Zealand's Hector's dolphin." Chemosphere 20, no. 7-9 (January 1990): 1035–42. http://dx.doi.org/10.1016/0045-6535(90)90217-h.

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44

Br�ger, S., J. A. Harraway, and B. F. J. Manly. "Habitat selection in a coastal dolphin species ( Cephalorhynchus hectori )." Marine Biology 143, no. 2 (August 1, 2003): 233–44. http://dx.doi.org/10.1007/s00227-003-1068-x.

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45

Leunissen, Eva M., William J. Rayment, and Stephen M. Dawson. "Impact of pile-driving on Hector's dolphin in Lyttelton Harbour, New Zealand." Marine Pollution Bulletin 142 (May 2019): 31–42. http://dx.doi.org/10.1016/j.marpolbul.2019.03.017.

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46

Dawson, Stephen M. "Clicks and Communication: The Behavioural and Social Contexts of Hector's Dolphin Vocalizations." Ethology 88, no. 4 (April 26, 2010): 265–76. http://dx.doi.org/10.1111/j.1439-0310.1991.tb00281.x.

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47

Gormley, Andrew M., Stephen M. Dawson, Stephen M. Dawson, Elisabeth Slooten, and Stefan Brager. "CAPTURE-RECAPTURE ESTIMATES OF HECTOR'S DOLPHIN ABUNDANCE AT BANKS PENINSULA, NEW ZEALAND." Marine Mammal Science 21, no. 2 (April 2005): 204–16. http://dx.doi.org/10.1111/j.1748-7692.2005.tb01224.x.

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48

Cameron, Claire, Richard Barker, David Fletcher, Elisabeth Slooten, and Stephen Dawson. "Modelling Survival of Hector's Dolphins around Banks Peninsula, New Zealand." Journal of Agricultural, Biological, and Environmental Statistics 4, no. 2 (June 1999): 126. http://dx.doi.org/10.2307/1400593.

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49

Turek, J., E. Slooten, S. Dawson, W. Rayment, and D. Turek. "Distribution and abundance of Hector's dolphins off Otago, New Zealand." New Zealand Journal of Marine and Freshwater Research 47, no. 2 (June 2013): 181–91. http://dx.doi.org/10.1080/00288330.2013.771687.

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King, R., and S. P. Brooks. "A Classical Study of Catch-Effort Models for Hector's Dolphins." Journal of the American Statistical Association 99, no. 466 (June 2004): 325–33. http://dx.doi.org/10.1198/016214504000000304.

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