{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,20]],"date-time":"2026-10-20T06:59:04Z","timestamp":1792479544539,"version":"4.5.0"},"reference-count":71,"publisher":"The Company of Biologists","issue":"6","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2009,3,15]]},"abstract":"<jats:title>SUMMARY<\/jats:title>\n               <jats:p>Synchronized video and high-frequency audio recordings of two trained harbour porpoises searching for and capturing live fish were used to study swimming and echolocation behaviour. One animal repeated the tasks blindfolded. A splash generated by the fish being thrown into the pool or\u2013 in controls \u2013 by a boat hook indicated prey and stimulated search behaviour. The echolocation sequences were divided into search and approach phases. In the search phase the porpoises displayed a clear range-locking behaviour on landmarks, indicated by a distance-dependent decrease in click interval. Only in trials with fish was the search phase followed by an approach phase. In the initial part of the approach phase the porpoises used a rather constant click interval of around 50 ms. The terminal part started with a sudden drop in click interval at distances around 2\u20134 m. Close to the prey the terminal part ended with a buzz,characterized by constant click intervals around 1.5 ms. The lag time in the search and the initial part of the approach phase seems to be long enough for the porpoise to process echo information before emitting the next click (pulse mode). However, we assume that during the buzz lag times are too short for pulse mode processing and that distance information is perceived as a `pitch'with a `frequency' corresponding to the inverse of the two-way transit time(pitch mode). The swimming speed of the animal was halved when it was blindfolded, while the click intervals hardly changed, resulting in more clicks emitted per metre swum.<\/jats:p>","DOI":"10.1242\/jeb.022137","type":"journal-article","created":{"date-parts":[[2009,2,27]],"date-time":"2009-02-27T19:04:15Z","timestamp":1235761455000},"page":"823-834","source":"Crossref","is-referenced-by-count":121,"title":["Echolocation by two foraging harbour porpoises (<i>Phocoena phocoena<\/i>)"],"prefix":"10.1242","volume":"212","author":[{"given":"Ursula K.","family":"Verfu\u00df","sequence":"first","affiliation":[{"name":"Fjord & B\u00e6lt, Margrethes Plads 1, DK-5300 Kerteminde, Denmark"},{"name":"Tierphysiologie, Zoologisches Institut, Universita\u0308t Tu\u0308bingen, Auf der Morgenstelle 28, D-72076 Tu\u0308bingen, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lee A.","family":"Miller","sequence":"additional","affiliation":[{"name":"Institute of Biology, University of Southern Denmark, DK-5230 Odense M,Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peter K. D.","family":"Pilz","sequence":"additional","affiliation":[{"name":"Tierphysiologie, Zoologisches Institut, Universita\u0308t Tu\u0308bingen, Auf der Morgenstelle 28, D-72076 Tu\u0308bingen, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hans-Ulrich","family":"Schnitzler","sequence":"additional","affiliation":[{"name":"Tierphysiologie, Zoologisches Institut, Universita\u0308t Tu\u0308bingen, Auf der Morgenstelle 28, D-72076 Tu\u0308bingen, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"237","reference":[{"key":"2021042512093603700_REF1","doi-asserted-by":"crossref","unstructured":"Akamatsu, T., Wang, D., Wang, K. and Naito, Y.(2005). Biosonar behaviour of free-ranging porpoises. Proc. Biol. Sci.272,797-801.","DOI":"10.1098\/rspb.2004.3024"},{"key":"2021042512093603700_REF2","doi-asserted-by":"crossref","unstructured":"Akamatsu, T., Teilmann, J., Miller, L. A., Tougaard, J., Dietz,R., Wang, D., Wang, K., Siebert, U. and Naito, Y. (2007). Comparison of echolocation behaviour between coastal and riverine porpoises. Deep Sea Res. Part II Top. Stud. Oceanogr.54,290-297.","DOI":"10.1016\/j.dsr2.2006.11.006"},{"key":"2021042512093603700_REF3","doi-asserted-by":"crossref","unstructured":"Amundin, M. and Andersen, S. H. (1983). Bony nares air pressure and nasal plug muscle activity during click production in the harbour porpoise, Phocoena phocoena, and the bottlenosed dolphin, Tursiops truncatus.J. Exp. Biol.105,275-282.","DOI":"10.1242\/jeb.105.1.275"},{"key":"2021042512093603700_REF4","unstructured":"Andersen, S. H. and Amundin, M. (1976). Possible predator-related adaptation of sound production and hearing in the harbour porpoise (Phocoena phocoena). Aquat. Mamm.4,56-57."},{"key":"2021042512093603700_REF5","doi-asserted-by":"crossref","unstructured":"Astrup, J. (1999). Ultrasound detection in fish-a parallel to the sonar-mediated detection of bats by ultrasound-sensitive insects? Comp. Biochem. Physiol., Part A Mol. Integr. Physiol.124,19-27.","DOI":"10.1016\/S1095-6433(99)00093-8"},{"key":"2021042512093603700_REF6","doi-asserted-by":"crossref","unstructured":"Astrup, J. and M\u00f8hl, B. (1993). Detection of intense ultrasound by the cod Gadus Morhua.J. Exp. Biol.182,71-80.","DOI":"10.1242\/jeb.182.1.71"},{"key":"2021042512093603700_REF7","doi-asserted-by":"crossref","unstructured":"Astrup, J. and M\u00f8hl, B. (1998). Discrimination between high and low repetition rates of ultrasonic pulses by the cod. J. Fish Biol.52,205-208.","DOI":"10.1111\/j.1095-8649.1998.tb01562.x"},{"key":"2021042512093603700_REF8","doi-asserted-by":"crossref","unstructured":"Au, W. W. L. (1993). The Sonar of Dolphins. New York: Springer.","DOI":"10.1007\/978-1-4612-4356-4"},{"key":"2021042512093603700_REF9","doi-asserted-by":"crossref","unstructured":"Au, W. W. L. and Nachtigall, P. E. (1997). Acoustics of echolocating dolphins and small whales. Mar. Freshwater Physiol. Behav.29,127-162.","DOI":"10.1080\/10236249709379004"},{"key":"2021042512093603700_REF10","doi-asserted-by":"crossref","unstructured":"Au, W. W. L., Kastelein, R. A., Rippe, T. and Schooneman, N. M. (1999). Transmission beam pattern and echolocation signals of a harbour porpoise (Phocoena phocoena). J. Acoust. Soc. Am.106,3699-3705.","DOI":"10.1121\/1.428221"},{"key":"2021042512093603700_REF11","doi-asserted-by":"crossref","unstructured":"Barrett-Lennard, L. G., Ford, J. K. B. and Heise, K. A.(1996). The mixed blessing of echolocation: differences in sonar use by fish-eating and mammal-eating killer whales. Anim Behav.51,553-565.","DOI":"10.1006\/anbe.1996.0059"},{"key":"2021042512093603700_REF12","doi-asserted-by":"crossref","unstructured":"Beedholm, K. and Miller, L. A. (2007). Automatic gain control in harbor porpoises (Phocoena phocoena)?Central versus peripheral mechanisms. Aquat. Mamm.33, 69-75.","DOI":"10.1578\/AM.33.1.2007.69"},{"key":"2021042512093603700_REF13","doi-asserted-by":"crossref","unstructured":"Brill, R. L., Sevenich, M. L., Sullivan, T. J., Sustman, J. D. and Witt, R. E. (1988). Behavioral evidence for hearing through the lower jaw by an echolocating dolphin (Tursiops truncatus). Mar. Mamm. Sci.4, 223-230.","DOI":"10.1111\/j.1748-7692.1988.tb00203.x"},{"key":"2021042512093603700_REF14","unstructured":"Busnel, R.-G. and Dziedzic, A. (1967). Resultants metrologiques experimentaux de l'echolocation chez le Phocaena phocaena et leur comparaison avec ceux de certaines chauves-souris. In Animal Sonar System, Biology and Bionics (ed. R.-G. Busnel), pp. 307-356. Jouy-en-Josas: Laboratoire de Physiologie Acoustique."},{"key":"2021042512093603700_REF15","doi-asserted-by":"crossref","unstructured":"Canfield, J. G. and Eaton, R. C. (1990). Swimbladder acoustic pressure transduction initiates Mauthner-mediated escape. 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Evol.45,183-194.","DOI":"10.1159\/000113549"},{"key":"2021042512093603700_REF19","unstructured":"Evans, W. E. and Powell, B. A. (1967). Discrimination of different metallic plates by an echolocating delphinid. In Animal Sonar Systems: Biology and Bionics (ed. R. G. Busnel), pp. 363-382. Jouy-en-Josas: Laboratoire de Physiologie Acoustique."},{"key":"2021042512093603700_REF20","doi-asserted-by":"crossref","unstructured":"Finsterwalder, R. and Hofmann, W. (1968). Photogrammetrie. Berlin: Walter de Gruyter.","DOI":"10.1515\/9783111706627"},{"key":"2021042512093603700_REF21","unstructured":"Goodson, A. D., Klinowska, M. and Morris, R.(1988). Interpreting the acoustic pulse emissions of a wild bottlenose dolphin (Tursiops truncatus). Aquat. Mamm.14,7-12."},{"key":"2021042512093603700_REF22","unstructured":"Goodson, A. D., Klinowska, M. and Bloom, P. R. S.(1994). Enhancing the acoustic detectability of gillnets. In Gillnets and Cetaceans (ed. W. F. Perrin, G. P. Donovan and J. Barlow), pp. 585-595. Cambridge: Black Bear Press."},{"key":"2021042512093603700_REF23","unstructured":"Goodson, A. D., Flint, J. A. and Cranford, T. W.(2004). The harbour porpoise (Phocoena phocoena)modeling the sonar transmission mechanism. In Echolocation in Bats and Dolphins (ed. J. A. Thomas, C. F. Moss and M. Vater), pp.64-85. Chicago, IL: The University of Chicago Press."},{"key":"2021042512093603700_REF24","unstructured":"Griffin, D. R. (1958). Listening in the Dark. New Haven, CT: Yale University Press."},{"key":"2021042512093603700_REF25","doi-asserted-by":"crossref","unstructured":"Griffin, D. R., Webster, F. A. and Michael, C. R.(1960). The echolocation of flying insects by bats. Anim Behav.8,141-154.","DOI":"10.1016\/0003-3472(60)90022-1"},{"key":"2021042512093603700_REF26","unstructured":"Herzing, D. L. (2004). Social and nonsocial uses of echolocation in free-ranging Stenella frontalis and Tursiops truncatus. In Echolocation in Bats and Dolphins (ed. J. A. Thomas, C. F. Moss and M. Vater), pp.404-410. Chicago, IL: The University of Chicago Press."},{"key":"2021042512093603700_REF27","doi-asserted-by":"crossref","unstructured":"Jensen, M. E. and Miller, L. A. (1999). Echolocation signals of the bat Eptesicus serotinus recorded using a vertical microphone array: effect of flight altitude on searching signals. Behav. Ecol. Sociobiol.47, 60-69.","DOI":"10.1007\/s002650050650"},{"key":"2021042512093603700_REF28","unstructured":"Johnson, C. S. (1967). Discussion. In Animal Sonar Systems: Biology and Bionics (ed. R. G. Busnel), pp. 384-398. Jouy-en-Josas: Laboratoire de Physiologie Acoustique."},{"key":"2021042512093603700_REF29","doi-asserted-by":"crossref","unstructured":"Johnson, M., Madsen, P. T., Zimmer, W. M. X., Aguilar de Soto,N. and Tyack, P. L. (2004). Beaked whales echolocate on prey. Proc. Biol. 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Classification of broadband echoes from prey of a foraging Blainville's beaked whale. J. Acoust. Soc. Am.123,1753-1762.","DOI":"10.1121\/1.2828210"},{"key":"2021042512093603700_REF33","doi-asserted-by":"crossref","unstructured":"Kalko, E. K. V. and Schnitzler, H.-U. (1989). The echolocation and hunting behavior of Daubenton's bat, Myotis daubentoni.Behav. Ecol. Sociobiol.24,225-238.","DOI":"10.1007\/BF00295202"},{"key":"2021042512093603700_REF34","doi-asserted-by":"crossref","unstructured":"Kalko, E. K. V. and Schnitzler, H. U. (1993). Plasticity in echolocation signals of European pipistrelle bats in search flight: implications for habitat use and prey detection. Behav. Ecol. Sociobiol.33,415-428.","DOI":"10.1007\/BF00170257"},{"key":"2021042512093603700_REF35","unstructured":"Kalko, E. K. V. and Schnitzler, H. U. (1998). How echolocating bats approach and acquire food. In Bat Biology and Conservation (ed. T. H. Kunz and P. A. Racey), pp.197-204. Washington DC: Smithsonian Institution Press."},{"key":"2021042512093603700_REF36","unstructured":"Kastelein, R., Schooneman, N. M., Au, W. W. L., Verboom, W. C. and Vaughan, N. (1997). The ability of a harbour porpoise(Phocoena phocoena) to discriminate between objects buried in sand. In The Biology of the Harbour Porpoise (ed. A. J. Read, P. R. Wiepkema and P. E. Nachtigall), pp.329-342. Woerden, The Netherlands: De Spil."},{"key":"2021042512093603700_REF37","doi-asserted-by":"crossref","unstructured":"Kastelein, R. A., Au, W. W. L., Rippe, H. T. and Schooneman, N. M. (1999). Target detection by an echolocating harbour porpoise (Phocoena phocoena). J. Acoust. Soc. Am.105,2493-2498.","DOI":"10.1121\/1.426951"},{"key":"2021042512093603700_REF38","unstructured":"Ketten, D. R. (2004). Marine mammal auditory systems: a summary of audiometric and anatomical data and implications for underwater acoustic impacts. In Polarforschung 2\/3(ed. D. K. Fu\u0308tterer), pp. 79-92. Bremerhaven:Deutsche Gesellschaft fu\u0308r Polarforschung e.V."},{"key":"2021042512093603700_REF39","unstructured":"Lucke, K., Wilson, R., Teilmann, J., Zankl, S., Adelung, D. and Siebert, U. (2000). Advances in the elucidation of cetacean behaviour: a case study on a harbour porpoise (Phocoena phocoena). In The Behaviour and Sensory Abilities of Harbour Porpoises (Phocoena phocoena) in Relation to Bycatch in Gillnet Fishery (ed. J. Teilmann), pp. 87-105. Odense: University of Southern Denmark, Center for Sound Communication, Institute of Biology."},{"key":"2021042512093603700_REF40","doi-asserted-by":"crossref","unstructured":"Madsen, P. T., Payne, R., Kristiansen, N. U., Wahlberg, M.,Kerr, I. and M\u00f8hl, B. (2002). Sperm whale sound production studied with ultrasound time\/depth-recording tags. J. Exp. Biol.205,1899-1906.","DOI":"10.1242\/jeb.205.13.1899"},{"key":"2021042512093603700_REF41","doi-asserted-by":"crossref","unstructured":"Madsen, P. T., Johnson, M., Aguilar de Soto, N., Zimmer, W. M. X. and Tyack, P. L. (2005). Biosonar performance of foraging beaked whales (Mesoplodon densirostris). J. Exp. Biol.208,181-194.","DOI":"10.1242\/jeb.01327"},{"key":"2021042512093603700_REF42","doi-asserted-by":"crossref","unstructured":"Mann, D. A., Lu, Z., Hastings, M. C. and Popper, A. N.(1998). Detection of ultrasonic tones and simulated dolphin echolocation clicks by a teleost fish, the American shad (Alosa sapidissima). J. Acoust. Soc. Am.104,562-568.","DOI":"10.1121\/1.423255"},{"key":"2021042512093603700_REF43","doi-asserted-by":"crossref","unstructured":"Mann, D. A., Higgs, D. M., Tavolga, W. N., Souza, M. J. and Popper, A. N. (2001). Ultrasound detection by clupeiform fishes. J. Acoust. Soc. Am.101,3045-3054.","DOI":"10.1121\/1.1368406"},{"key":"2021042512093603700_REF44","unstructured":"McCullagh, P. and Nelder, J. A. (1991). Generalized Linear Models. London: Chapman &Hall."},{"key":"2021042512093603700_REF45","doi-asserted-by":"crossref","unstructured":"Melco\u0301n, M. L., Denzinger, A. and Schnitzler, H.-U.(2007). Aerial hawking and landing: approach behaviour in Natterer's bats, Myotis nattereri (Kuhl 1818). J. Exp. Biol.210,4457-4464.","DOI":"10.1242\/jeb.007435"},{"key":"2021042512093603700_REF46","doi-asserted-by":"crossref","unstructured":"Miller, L. A. and Surlykke, A. (2001). How some insects detect and avoid being eaten by bats: Tactics and countertactics of prey and predator. Bioscience51,570-581.","DOI":"10.1641\/0006-3568(2001)051[0570:HSIDAA]2.0.CO;2"},{"key":"2021042512093603700_REF47","doi-asserted-by":"crossref","unstructured":"Miller, L. A., Pristed, J., M\u00f8hl, B. and Surlykke, A.(1995). The click-sounds of narwhals (Monodon monoceros)in Inglefield Bay, Northwest Greenland. Mar. Mamm. Sci.11,491-502.","DOI":"10.1111\/j.1748-7692.1995.tb00672.x"},{"key":"2021042512093603700_REF48","doi-asserted-by":"crossref","unstructured":"Miller, P. J. O., Johnson, M. P. and Tyack, P. L.(2004). Sperm whale behaviour indicates the use of echolocation click buzzes \u201ccreaks\u201d in prey capture. Proc. Biol. Sci.271,2239-2247.","DOI":"10.1098\/rspb.2004.2863"},{"key":"2021042512093603700_REF49","doi-asserted-by":"crossref","unstructured":"Morisaka, T. and Connor, R. C. (2007). Predation by killer whales (Orcinus orca) and the evolution of whistle loss and narrow-band high frequency clicks in odontocetes. J. Evol. Biol.20,1439-1458.","DOI":"10.1111\/j.1420-9101.2007.01336.x"},{"key":"2021042512093603700_REF50","unstructured":"Morozov, V. P., Akopian, A. I., Burdin, V. I., Zaitseva, K. A. and Sokovykh, Y. A. (1972). Tracking frequency of the location signals of dolphins as a function of distance to the target. Biofizika17,139-145."},{"key":"2021042512093603700_REF51","doi-asserted-by":"crossref","unstructured":"Neuweiler, G. (1983). Echolocation and adaptivity to ecological constraints. In Neuroethology and Behavioral Physiology (ed. F. Huber and H. Markl), pp.280-302. Berlin: Springer-Verlag.","DOI":"10.1007\/978-3-642-69271-0_21"},{"key":"2021042512093603700_REF52","doi-asserted-by":"crossref","unstructured":"Nordmark, J. (1960). Perception of distance in animal echo-location. Nature188,1009-1010.","DOI":"10.1038\/1881009a0"},{"key":"2021042512093603700_REF53","doi-asserted-by":"crossref","unstructured":"Pinheiro, J. C. and Bates, D. M. (2000). Mixed-Effects Models in S and S-PLUS. New York:Springer.","DOI":"10.1007\/978-1-4419-0318-1"},{"key":"2021042512093603700_REF54","doi-asserted-by":"crossref","unstructured":"Plachta, D. T. T. and Popper, A. N. (2003). Evasive responses of American shad (Alosa sapidissima) to ultrasonic stimuli. Acoust. Res. Lett. Online. 4, 25-30.","DOI":"10.1121\/1.1558376"},{"key":"2021042512093603700_REF55","doi-asserted-by":"crossref","unstructured":"Popper, A. N. and Fay, R. R. (1995). Hearing by Bats. New York: Springer.","DOI":"10.1007\/978-1-4612-2556-0"},{"key":"2021042512093603700_REF56","unstructured":"R Development Core Team (2007). R: A Language and Environment for Statistical Computing. Vienna: R Foundation for Statistical Computing, http:\/\/www.r-project.org."},{"key":"2021042512093603700_REF57","doi-asserted-by":"crossref","unstructured":"Santos, M. B., Martin, V., Arbelo, M., Ferna\u0301ndez, A. and Pierce, G. J. (2007). Insights into the diet of beaked whales from the atypical mass stranding in Canary Islands in September 2002. J. Mar. Biol. Assoc. UK87,243-251.","DOI":"10.1017\/S0025315407054380"},{"key":"2021042512093603700_REF58","doi-asserted-by":"crossref","unstructured":"Schack, H. B., Malte, H. and Madsen, P. T.(2008). The responses of Atlantic cod (Gadus morhua) to ultrasound emitting predators: stress, behavioural changes or debilitation?J. Exp. Biol.211,2079-2086.","DOI":"10.1242\/jeb.015081"},{"key":"2021042512093603700_REF59","unstructured":"Schnitzler, H. U. (1967). Discrimination of thin wires by flying horseshoe bats (Rhinolophidae). In Animal Sonar System, Biology and Bionics (ed. R. G. Busnel), pp. 69-87. Jouy-en-Josas: Laboratoire de Physiologie Acoustique."},{"key":"2021042512093603700_REF60","unstructured":"Schnitzler, H. U. and Kalko, E. K. V. (1998). How echolocating bats search and find food. In Bat Biology and Conservation (ed. T. H. Kunz and P. A. Racey), pp.183-196. Washington, DC: Smithsonian Institution Press."},{"key":"2021042512093603700_REF61","doi-asserted-by":"crossref","unstructured":"Schnitzler, H. U., Moss, C. F. and Denzinger, A.(2003). From spatial orientation to food acquisition in echolocating bats. Trends Ecol. Evol.18,386-394.","DOI":"10.1016\/S0169-5347(03)00185-X"},{"key":"2021042512093603700_REF62","doi-asserted-by":"crossref","unstructured":"Schwidefsky, K. and Ackermann, F. (1976). Photogrammetrie. Grundlagen, Verfahren, Anwendungen. Stuttgart: Teubner.","DOI":"10.1007\/978-3-322-94008-7"},{"key":"2021042512093603700_REF63","doi-asserted-by":"crossref","unstructured":"Simon, M., Wahlberg, M. and Miller, L. A.(2007). Echolocation clicks from killer whales (Orcinus orca) feeding on herring (Clupea harengus) (L). J. Acoust. Soc. Am.121,749-752.","DOI":"10.1121\/1.2404922"},{"key":"2021042512093603700_REF64","unstructured":"Sokal, R. R. and Rohlf, F. J. (1995). Biometry: The Principles and Practice of Statistics in Biological Research. New York: Freeman."},{"key":"2021042512093603700_REF65","doi-asserted-by":"crossref","unstructured":"Surlykke, A., Miller, L. A., M\u00f8hl, B., Andersen, B. B.,Christensen-Dalsgaard, J. and Jorgensen, M. B. (1993). Echolocation in two very small bats from Thailand: Craseonycteris thonglongyai and Myotis siligorensis.Behav. Ecol. Sociobiol.33,1-12.","DOI":"10.1007\/BF00164341"},{"key":"2021042512093603700_REF66","unstructured":"Thomas, J. A., Moss, C. F. and Vater, M.(2004). Echolocation in Bats and Dolphins. Chicago: University of Chicago Press."},{"key":"2021042512093603700_REF67","unstructured":"Verfu\u00df, U. K. and Schnitzler, H.-U.(2002). F+E Vorhaben: Untersuchungen zum Echoortungsverhalten der Schweinswale (Phocoena phocoena) als Grundlage fu\u0308r Schutzma\u00dfnahmen. FKZ-Nr.: 898 86 021. Tu\u0308bingen: Universita\u0308t Tu\u0308bingen."},{"key":"2021042512093603700_REF68","doi-asserted-by":"crossref","unstructured":"Verfu\u00df, U. K., Miller, L. A. and Schnitzler, H. U.(2005). Spatial orientation in echolocating harbour porpoises(Phocoena phocoena). J. Exp. Biol.208,3385-3394.","DOI":"10.1242\/jeb.01786"},{"key":"2021042512093603700_REF69","unstructured":"Verfu\u00df, U. K., Honnef, C. G., Meding, A., Da\u0308hne, M.,Adler, S., Kilian, A. and Benke, H. (2008). The history of the German Baltic Sea harbour porpoise acoustic monitoring at the German Oceanographic Museum. In Marine Mammals and Seabirds in Front of Offshore Wind Energy, MINOS: Marine warm-blooded animals in North and Baltic Seas (ed. K. Wollny-Goerke and K. Eskildsen), pp.41-56. Wiesbaden: Teubner Verlag."},{"key":"2021042512093603700_REF70","doi-asserted-by":"crossref","unstructured":"Wilson, M., Hanlon, R. T., Tyack, P. L. and Madsen, P. T.(2007). Intense ultrasonic clicks from echolocating toothed whales do not elicit anti-predator responses or debilitate the squid Loligo pealeii.Biol. Lett.3, 225-227.","DOI":"10.1098\/rsbl.2007.0005"},{"key":"2021042512093603700_REF71","doi-asserted-by":"crossref","unstructured":"Zuur, A. F., Ieno, E. N. and Smith, G. M.(2007). Analysing Ecological Data. 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