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Per Berggren - One of the best experts on this subject based on the ideXlab platform.
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Description and classification of echolocation clicks of Indian Ocean humpback (Sousa plumbea) and Indo-Pacific bottlenose (Tursiops aduncus) dolphins from Menai Bay, Zanzibar, East Africa.
'Public Library of Science (PLoS)', 2020Co-Authors: Liangliang Yang, Narriman Jiddawi, Matt Sharpe, Andrew J Temple, Per BerggrenAbstract:Passive acoustic monitoring (PAM) is a powerful method to study the occurrence, movement and behavior of echolocating odontocetes (toothed whales) in the wild. However, in areas occupied by more than one species, echolocation clicks need to be classified into species. The present study investigated whether the echolocation clicks produced by small, at-risk, resident sympatric populations of Indian Ocean humpback dolphin (Sousa plumbea) and Indo-Pacific bottlenose dolphin (Tursiops aduncus) in Menai Bay, Zanzibar, East Africa, could be classified to allow species specific monitoring. Underwater sounds of S. plumbea and T. aduncus groups were recorded using a SoundTrap 202HF in January and June-August 2015. Eight acoustic parameters, i.e. -10 dB duration, peak, centroid, lower -3 and lower -10 dB frequencies, and -3 dB, -10 dB and root-mean-squared bandwidth, were used to describe and compare the two species' echolocation clicks. Statistical analyses showed that S. plumbea clicks had significantly higher peak, centroid, lower -3 and lower -10 dB frequencies compared to T. aduncus, whereas duration and bandwidth parameters were similar for the two species. Random Forest (RF) classifiers were applied to determine parameters that could be used to classify the two species from echolocation clicks and achieved 28.6% and 90.2% correct species classification rates for S. plumbea and T. aduncus, respectively. Both species were classified at a higher rate than expected at random, however the identified classifiers would only be useful for T. aduncus monitoring. The frequency and bandwidth parameters provided most power for species classification. Further study is necessary to identify useful classifiers for S. plumbea. This study represents a first step in acoustic description and classification of S. plumbea and T. aduncus in the western Indian Ocean region, with potential application for future acoustic monitoring of species-specific temporal and spatial occurrence in these sympatric species
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organohalogen compounds in blubber of indo pacific bottlenose dolphin Tursiops aduncus and spinner dolphin stenella longirostris from zanzibar tanzania
Environmental Pollution, 2010Co-Authors: Haji Mwevura, Omar A. Amir, Per Berggren, Michael Kishimba, Henrik KylinAbstract:Blubber samples of Indo-Pacific bottlenose (Tursiops aduncus) and spinner (Stenella longirostris) dolphins from Zanzibar, East Africa, were analysed for a wide range of organohalogen compounds. Met ...
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population size distribution and behavior of indo pacific bottlenose Tursiops aduncus and humpback sousa chinensis dolphins off the south coast of zanzibar
Marine Mammal Science, 2006Co-Authors: Eva Stensland, Ida Carlen, Anna Sarnblad, Anders Bignert, Per BerggrenAbstract:Indo-Pacific bottlenose (Tursiops aduncus) and humpback dolphins (Sousa chinensis) off the south coast of Zanzibar, East Africa, have been subject to both direct and indirect takes as well as distu ...
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Feeding ecology of the Indo-Pacific bottlenose dolphin (Tursiops aduncus) incidentally caught in the gillnet fisheries off Zanzibar, Tanzania
Estuarine Coastal and Shelf Science, 2005Co-Authors: Omar A. Amir, Per Berggren, Simon G. M. Ndaro, Narriman JiddawiAbstract:The stomach contents of 26 Indo-Pacific bottlenose dolphins (Tursiops aduncus) incidentally caught in gillnet fisheries around Unguja Island (Zanzibar) between February 2000 and August 2002 were examined. The relative importance of each prey species was assessed through indices of relative importance. In total, 1403 prey items comprising 50 species of bony fish and three species of squid were identified from food remains. Five species of fish, Uroconger lepturus, Synaphobranchus kaupii, Apogon apogonides, Lethrinus crocineus, Lutjanus fulvus, and three species of squid, Sepioteuthis lessoniana, Sepia latimanus and Loligo duvauceli, were the most important prey species. Based on an index that included frequency of occurrence, percentage by number and by weight, Uroconger lepturus proved to be the most important prey species of mature dolphins whereas Apogon apogonides was the preferred prey of immature dolphins. These results indicate that Indo-Pacific bottlenose dolphins off the coast of Zanzibar forage on a relatively large number of prey species, but that only a few small- and medium-sized neritic fish and cephalopods contribute substantially to the diet. Further, the ecology and behavior of the preferred fish prey species indicate that the dolphins forage over reef or soft bottom substrata and near the shore.
Lars Bejder - One of the best experts on this subject based on the ideXlab platform.
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Food-provisioning negatively affects calf survival and female reproductive success in bottlenose dolphins.
Scientific reports, 2019Co-Authors: V. Senigaglia, Fredrik Christiansen, Kate R. Sprogis, John Symons, Lars BejderAbstract:Food-provisioning of wildlife can facilitate reliable up-close encounters desirable by tourists and, consequently, tour operators. Food-provisioning can alter the natural behavior of an animal, encouraging adverse behavior (e.g. begging for food handouts), and affect the reproductive success and the viability of a population. Studies linking food-provisioning to reproductive success are limited due to the lack of long-term datasets available, especially for long-lived species such as marine mammals. In Bunbury, Western Australia, a state-licensed food-provisioning program offers fish handouts to a limited number of free-ranging bottlenose dolphins (Tursiops aduncus). Coupled with long-term historical data, this small (
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Shark bite injuries on three inshore dolphin species in tropical northwestern Australia
Marine Mammal Science, 2017Co-Authors: Felix Smith, Lars Bejder, Simon J. Allen, A. BrownAbstract:Predation risk has a profound influence on the behavior of marine mammals, affecting grouping patterns and habitat use. Dolphins frequently bear evidence of shark bites, which can provide an indirect measure of predation pressure. Using photo-identification data, we investigated the prevalence of shark bites on three sympatric species of inshore dolphin, the Australian snubfin (Orcaella heinsohni), Australian humpback (Sousa sahulensis), and Indo-Pacific bottlenose dolphin (Tursiops aduncus), among four study sites in northwestern Australia. Bite prevalence varied markedly between species, with 72% of snubfin, 46% of humpback, and 18% of bottlenose dolphins exhibiting evidence of shark bites. Binomial logistic regression confirmed a high likelihood of bite presence on snubfin dolphins, and at one particular site for snubfin and bottlenose dolphins. The prevalence of tiger shark (Galeocerdo cuvier) bites on snubfin dolphins was high, and bites attributed to other carcharhinid sharks were observed on all species. While acknowledging methodological differences with other studies, the prevalence of shark bites on snubfin dolphins is among the highest reported for any dolphins, suggesting predation risk represents an important but varying influence thereon. This study provides a baseline for future investigations into the affect of predation risk on the behavioral ecology of these sympatric species.
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in Coastal Indo-Pacific
2016Co-Authors: N. Stephens, John Bingham, Padraig J Duignan, H. Finn, J. Wang, Lars Bejder, I. Anthony, P. Patterson, C. HolyoakeAbstract:Cetacean morbillivirus (CeMV) has caused several epizootics in multiple species of cetaceans globally and is an emerging disease among cetaceans in Australia. We detected CeMV in 2 stranded coastal Indo-Pacific bottle-nose dolphins (Tursiops aduncus) in Western Australia. Preliminary phylogenetic data suggest that this virus variant is divergent from known strains. Cetacean morbillivirus (CeMV; family Paramyxoviri-dae) has caused several epizootics globally during the past 25 years. Three strains of CeMV—porpoise, dolphin, and pilot whale morbillivirus—are classified as 1 species (1). CeMV is more closely related to ruminant morbillivi-ruses and human measles virus than to canine and phocine distemper viruses (1,2). Recently, a morbillivirus with phylogenetic similar-ity to dolphin morbillivirus (DMV) caused the death o
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use of the robust design to estimate seasonal abundance and demographic parameters of a coastal bottlenose dolphin Tursiops aduncus population
PLOS ONE, 2013Co-Authors: H Smith, Kenneth H Pollock, Kelly Waples, Stuart Bradley, Lars BejderAbstract:As delphinid populations become increasingly exposed to human activities we rely on our capacity to produce accurate abundance estimates upon which to base management decisions. This study applied mark–recapture methods following the Robust Design to estimate abundance, demographic parameters, and temporary emigration rates of an Indo-Pacific bottlenose dolphin (Tursiops aduncus) population off Bunbury, Western Australia. Boat-based photo-identification surveys were conducted year-round over three consecutive years along pre-determined transect lines to create a consistent sampling effort throughout the study period and area. The best fitting capture–recapture model showed a population with a seasonal Markovian temporary emigration with time varying survival and capture probabilities. Abundance estimates were seasonally dependent with consistently lower numbers obtained during winter and higher during summer and autumn across the three-year study period. Specifically, abundance estimates for all adults and juveniles (combined) varied from a low of 63 (95% CI 59 to 73) in winter of 2007 to a high of 139 (95% CI 134 to148) in autumn of 2009. Temporary emigration rates (γ') for animals absent in the previous period ranged from 0.34 to 0.97 (mean = 0.54; ±SE 0.11) with a peak during spring. Temporary emigration rates for animals present during the previous period (γ'') were lower, ranging from 0.00 to 0.29, with a mean of 0.16 (± SE 0.04). This model yielded a mean apparent survival estimate for juveniles and adults (combined) of 0.95 (± SE 0.02) and a capture probability from 0.07 to 0.51 with a mean of 0.30 (± SE 0.04). This study demonstrates the importance of incorporating temporary emigration to accurately estimate abundance of coastal delphinids. Temporary emigration rates were high in this study, despite the large area surveyed, indicating the challenges of sampling highly mobile animals which range over large spatial areas.
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source parameters of echolocation clicks from wild bottlenose dolphins Tursiops aduncus and Tursiops truncatus
Journal of the Acoustical Society of America, 2011Co-Authors: Magnus Wahlberg, Lars Bejder, Frants H Jensen, Natacha Aguilar De Soto, Kristian Beedholm, Claudia P Oliveira, Marianne H Rasmussen, Malene Simon, Anne Villadsgaard, Peter T MadsenAbstract:The Indian Ocean and Atlantic bottlenose dolphins (Tursiops aduncus and Tursiops truncatus) are among the best studied echolocating toothed whales. However, almost all echolocation studies on bottlenose dolphins have been made with captive animals, and the echolocation signals of free-ranging animals have not been quantified. Here, biosonar source parameters from wild T. aduncus and T. truncatus were measured with linear three- and four-hydrophone arrays in four geographic locations. The two species had similar source parameters, with source levels of 177–228 dB re 1 μPa peak to peak, click durations of 8–72 μs, centroid frequencies of 33–109 kHz and rms bandwidths between 23 and 54 kHz. T. aduncus clicks had a higher frequency emphasis than T. truncatus. The transmission directionality index was up to 3 dB higher for T. aduncus (29 dB) as compared to T. truncatus (26 dB). The high directionality of T. aduncus does not appear to be only a physical consequence of a higher frequency emphasis in clicks, but may also be caused by differences in the internal properties of the sound production system.
Indrawati Agustin - One of the best experts on this subject based on the ideXlab platform.
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Bacterial Pneumonia sebagai Salah Satu Penyebab Kematian Lumba Lumba Hidung Botol Indo-Pasifik (Tursiop aduncus)
'Institut Pertanian Bogor', 2020Co-Authors: Indrawati Agustin, Maharani Jeni, Fadillah Nurul, Arum, Diah Sekar, Yenri Hamdika, Velayati, Risqika Aqla, Fadlilah, Ulfi Nurul, Naldi Jefri, Nurhasanah AfifahAbstract:Lumba-lumba hidung botol Indo-Pasifik (Tursiops aduncus) merupakan jenis lumba-lumba yang banyak ditemukan di perairan Indonesia. Kelestarian T. aduncus perlu mendapat perhatian karena populasinya yang semakin menurun. Upaya pelestarian yang telah dilakukan adalah melalui konservasi. Gangguan respirasi pada lumba-lumba sering ditemukan dan berakibat fatal, salah satu penyakit yang sering ditemukan adalah pneumonia. Pneumonia jenis bronchopneumonia merupakan salah satu gejala infeksi pada paru yang disebabkan oleh bakteri, virus ataupun jamur. Tujuan penelitian ini adalah melakukan isolasi dan identifikasi bakteri yang berperan dalam kejadian pneumonia. Sampel berasal dari seekor lumba lumba jantan yang ada di Pusat Konservasi Mamalia air. Tahapan penelitian ini antara lain isolasi dan identifikasi bakteri dari organ paru-paru yang menunjukkan gejala patologis. Hasil isolasi dan identifikasi ditemukan 2 spesies Gram positif yaitu Staphylococcus epidermidis dan Staphylococcus aureus serta 4 spesies Gram negatif, yaitu Pseudomonas alcaligenes, Actinobacillus delphinicola, Klebsiella sp. dan Serratia marcesens
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Studi Sistem Respirasi dan Kajian Mikrobiologis Lumba-lumba Hidung Botol Indo Pasifik (Tursiops aduncus) dari Perairan Laut Jawa
'Institut Pertanian Bogor', 2014Co-Authors: Mulyani, Guntari Titik, Fibrianto, Yuda Heru, Budipitojo Teguh, Indrawati AgustinAbstract:Lumba-lumba hidung botol (bottlenose dolphin) adalah spesies lumba-lumba yang paling umum danpaling dikenal orang. Gangguan sistem respirasi pada lumba-lumba sering dijumpai, sementara jenisbakteri yang sering menyerang lumba-lumba dari perairan Laut Jawa belum pernah diteliti. Penelitianini bertujuan untuk mempelajari pemeriksaan klinis sistem respirasi lumba-lumba dan melakukan isolasibakteri serta jamur pada sistem respirasi bottlenose dolphin (Tursiops aduncus) dari Perairan Laut Jawa.Penelitian dilakukan dengan studi pustaka, pemeriksaan klinis serta isolasi sampel sistem respirasi. Swabdeep blowhole dilakukan terhadap sepuluh ekor bottlenose dolphin di PT. Wersut Seguni Indonesia.Sampel dikirim ke laboratorium Mikrobiologi FKH UGM untuk isolasi dan identifikasi terhadap bakteridan jamur. Hasil penelitian menunjukan bahwa pemeriksaan klinis lumba-lumba hanya dapat dilakukansecara inspeksi. Hasil isolasi ditemukan bahwa 5 dari 10 lumba-lumba (50%) positif Staphylococcus aureus,sedangkan jamur tidak ditemukan. Berdasarkan hasil penelitian, disimpulkan bahwa pemeriksaan klinislumba-lumba dapat dilakukan dengan cara inspeksi terhadap blowhole, tingkah laku hewan, adanya“chuff” atau “honk”, frekuensi respirasi, sosialisasi hewan dan posisi hewan saat berenang. BakteriStaphylococcus aureus dijumpai pada sistem pernafasan lumba-lumba hidung botol dari perairan LautJawa di PT. Wersut Seguni Indonesia
Hestrianoto Totok - One of the best experts on this subject based on the ideXlab platform.
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KARAKTERISTIK BIOAKUSTIK DAN TINGKAH LAKU LUMBA-LUMBA JANTAN HIDUNG BOTOL (Tursiops aduncus)
'Jurnal Teknologi Perikanan dan Ilmu Kelautan', 2017Co-Authors: Lubis, Muhammad Zainuddin, Wulandari, Pratiwi Dwi, Hestrianoto TotokAbstract:Bioacoustic is the science that combines biology and acoustics are usually refers to research on sound production, dispersion through elastic media, and reception in animals, including humans .This study observed the behavior male dolphins by doing science approach bioakustik who viewed the characteristics of these dolphins. Male dolphins (Tursiops aduncus) that maintained at Taman Safari Indonesia, Cisarua Bogor has the lowest intensity value amounting to 28.03 dB and the highest amounted to 32.01 dB. Average parameters is measurable salinity of 30 ppm and a temperature of 23 °C with the depth of the pool is 4.5 meter. Range frequency clicking sound with the highest intensity value that is equal to 32 dB with a clicking sound 3 after dinner on day 2 contained in the frequency range ie 1400-1600 Hz. Click sound frequency range of male dolphins (Tursiop aduncus) in Taman Safari have frequency 1400- 1500 Hz.Bioakustik adalah ilmu yang menggabungkan biologi dan akustik yang biasanya merujuk pada penelitian mengenai produksi suara, dispersi melalui media elastis, dan penerimaan pada hewan, termasuk manusia. Penelitian ini mengamati tingkah laku lumba-lumba jantan dengan melakukan pendekatan ilmu bioakustik yang melihat karakteristik dari lumba-lumba tersebut. Lumba-lumba jantan (Tursiops aduncus) yang dipelihara di Taman Safari Indonesia, Cisarua Bogor memiliki nilai intensitas terendah sebesar 28.03 dB dan tertinggi adalah sebesar 32.01 dB. Rata-rata parameter yang terukur yaitu salinitas sebesar 30 ppm dan suhu 23 °C dengan kedalaman kolam 4,5 meter. Range frekuensi suara klik dengan nilai intensitas tertinggi yaitu sebesar 32 dB dengan suara klik 3 sesudah makan pada hari ke 2 yang terdapat pada range frekuensi yaitu 1400-1600 Hz. Range frekuensi suara klik lumba-lumba jantan (Tursiop aduncus) di Taman Safari yaitu pada frekuensi 1400- 1500 Hz
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PRODUKSI SUARA DAN TINGKAH LAKU LUMBA-LUMBA JANTAN HIDUNG BOTOL (Tursiops aduncus ) DENGAN METODE BIOAKUSTIK DI TAMAN SAFARI, CISARUA BOGOR, INDONESIA
'Badan Penerbitan Fakultas Pertanian (BPFP) Universitas Bengkulu', 2016Co-Authors: Lubis, Muhammad Zainuddin, Pujiyanti Sri, Hestrianoto Totok, Wulandari, Pratiwi Dwi, Sultan KeniAbstract:Produksi suara merupakan bagian dari metode bioakustik, yaitu menggabungkan biologi dan akustik yang biasanya merujuk pada penelitian mengenai produksi suara,dispersi melalui media elastis, dan penerimaan pada hewan, termasuk manusia. Penelitianini mengamati tingkah laku lumba-lumba jantan dengan melakukan pendekatan ilmubioakustik yang melihat karakteristik dari lumba-lumba tersebut. Lumba-lumba jantan(Tursiops aduncus) yang dipelihara di Taman Safari Indonesia, Cisarua Bogor memiliki nilaiintensitas terendah sebesar 28,03 dB dan tertinggi adalah sebesar 32,01 dB. Dengan ratarataparameter yang terukur yaitu salinitas sebesar 30 ‰ dan suhu 23 °C dengankedalaman kolam 4,5 meter. Range frekuensi suara klik dengan nilai intensitas tertinggiyaitu sebesar 32 dB dengan suara klik sesudah makan pada hari ke 2 yang terdapat padarange frekuensi yaitu 14 - 16 kHz. Range frekuensi suara klik lumba-lumba jantan hidungbotol (Tursiops aduncus) di Taman Safari, Cisarua Bogor, Indonesia yaitu pada frekuensi14,2- 15 kHz.
Lubis, Muhammad Zainuddin - One of the best experts on this subject based on the ideXlab platform.
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KARAKTERISTIK BIOAKUSTIK DAN TINGKAH LAKU LUMBA-LUMBA JANTAN HIDUNG BOTOL (Tursiops aduncus)
'Jurnal Teknologi Perikanan dan Ilmu Kelautan', 2017Co-Authors: Lubis, Muhammad Zainuddin, Wulandari, Pratiwi Dwi, Hestrianoto TotokAbstract:Bioacoustic is the science that combines biology and acoustics are usually refers to research on sound production, dispersion through elastic media, and reception in animals, including humans .This study observed the behavior male dolphins by doing science approach bioakustik who viewed the characteristics of these dolphins. Male dolphins (Tursiops aduncus) that maintained at Taman Safari Indonesia, Cisarua Bogor has the lowest intensity value amounting to 28.03 dB and the highest amounted to 32.01 dB. Average parameters is measurable salinity of 30 ppm and a temperature of 23 °C with the depth of the pool is 4.5 meter. Range frequency clicking sound with the highest intensity value that is equal to 32 dB with a clicking sound 3 after dinner on day 2 contained in the frequency range ie 1400-1600 Hz. Click sound frequency range of male dolphins (Tursiop aduncus) in Taman Safari have frequency 1400- 1500 Hz.Bioakustik adalah ilmu yang menggabungkan biologi dan akustik yang biasanya merujuk pada penelitian mengenai produksi suara, dispersi melalui media elastis, dan penerimaan pada hewan, termasuk manusia. Penelitian ini mengamati tingkah laku lumba-lumba jantan dengan melakukan pendekatan ilmu bioakustik yang melihat karakteristik dari lumba-lumba tersebut. Lumba-lumba jantan (Tursiops aduncus) yang dipelihara di Taman Safari Indonesia, Cisarua Bogor memiliki nilai intensitas terendah sebesar 28.03 dB dan tertinggi adalah sebesar 32.01 dB. Rata-rata parameter yang terukur yaitu salinitas sebesar 30 ppm dan suhu 23 °C dengan kedalaman kolam 4,5 meter. Range frekuensi suara klik dengan nilai intensitas tertinggi yaitu sebesar 32 dB dengan suara klik 3 sesudah makan pada hari ke 2 yang terdapat pada range frekuensi yaitu 1400-1600 Hz. Range frekuensi suara klik lumba-lumba jantan (Tursiop aduncus) di Taman Safari yaitu pada frekuensi 1400- 1500 Hz
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PRODUKSI SUARA DAN TINGKAH LAKU LUMBA-LUMBA JANTAN HIDUNG BOTOL (Tursiops aduncus ) DENGAN METODE BIOAKUSTIK DI TAMAN SAFARI, CISARUA BOGOR, INDONESIA
'Badan Penerbitan Fakultas Pertanian (BPFP) Universitas Bengkulu', 2016Co-Authors: Lubis, Muhammad Zainuddin, Pujiyanti Sri, Hestrianoto Totok, Wulandari, Pratiwi Dwi, Sultan KeniAbstract:Produksi suara merupakan bagian dari metode bioakustik, yaitu menggabungkan biologi dan akustik yang biasanya merujuk pada penelitian mengenai produksi suara,dispersi melalui media elastis, dan penerimaan pada hewan, termasuk manusia. Penelitianini mengamati tingkah laku lumba-lumba jantan dengan melakukan pendekatan ilmubioakustik yang melihat karakteristik dari lumba-lumba tersebut. Lumba-lumba jantan(Tursiops aduncus) yang dipelihara di Taman Safari Indonesia, Cisarua Bogor memiliki nilaiintensitas terendah sebesar 28,03 dB dan tertinggi adalah sebesar 32,01 dB. Dengan ratarataparameter yang terukur yaitu salinitas sebesar 30 ‰ dan suhu 23 °C dengankedalaman kolam 4,5 meter. Range frekuensi suara klik dengan nilai intensitas tertinggiyaitu sebesar 32 dB dengan suara klik sesudah makan pada hari ke 2 yang terdapat padarange frekuensi yaitu 14 - 16 kHz. Range frekuensi suara klik lumba-lumba jantan hidungbotol (Tursiops aduncus) di Taman Safari, Cisarua Bogor, Indonesia yaitu pada frekuensi14,2- 15 kHz.
