A5011866613- Marine animal studies overview
- Animal Vocal Communication and Behavior
- Marine and fisheries research
- Avian ecology and behavior
- Cephalopods and Marine Biology
- Underwater Acoustics Research
- Wildlife Ecology and Conservation
- Marine Biology and Ecology Research
- Animal Behavior and Welfare Studies
- Arctic and Antarctic ice dynamics
- Fish biology, ecology, and behavior
- Genetic diversity and population structure
- Fish Ecology and Management Studies
- Fish Biology and Ecology Studies
- Ichthyology and Marine Biology
- Wildlife-Road Interactions and Conservation
- International Maritime Law Issues
- Coral and Marine Ecosystems Studies
- Animal Behavior and Reproduction
- Speech and Audio Processing
- Environmental and Social Impact Assessments
- Geochemistry and Elemental Analysis
- Morphological variations and asymmetry
- Identification and Quantification in Food
- Biological Control of Invasive Species
BioConsult SH (Germany)
2022-2024
German Oceanographic Museum
2009-2024
University of Hull
2024
Edith Cowan University
2024
Whale Museum
2011-2013
University of Otago
1998-2012
Klinik Preetz
2005
Texas A&M University
1993-1994
Summary 1. Marine protected areas (MPAs) have been advocated for the protection of threatened marine mammals, but there is no empirical evidence that they are effective. In 1988, Banks Peninsula Mammal Sanctuary was established to reduce gillnet mortalities Hector’s dolphin Cephalorhynchus hectori , an endangered species endemic New Zealand. This study assesses effectiveness MPA in improving survival rate at Peninsula. 2. Over 21 years, we undertook photo‐identification surveys dolphins...
Abstract Knowledge about home ranges is essential for understanding the resources required by a species, identifying critical habitats, and revealing overlap with anthropogenic impacts. Ranging behavior of Hector's dolphins ( Cephalorhynchus hectori ) was studied via coastal photo‐ID surveys in Banks Peninsula Marine Mammal Sanctuary (BPMMS) between 1985 2006. Univariate kernel density estimates alongshore range were calculated 20 individuals 15 sightings or more. For each individual,...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 547:257-272 (2016) - DOI: https://doi.org/10.3354/meps11627 Diel and seasonal patterns in acoustic presence foraging behaviour of free-ranging harbour porpoises Tobias Schaffeld1,2,3,*, Stefan Bräger1,4, Anja Gallus1, Michael Dähne1,3, Kathrin Krügel1, Anne Herrmann1, Martin Jabbusch1, Thomas Ruf5, Ursula K....
Resightings of photographically identified bottlenose dolphins ( Tursiops truncatus ) were used to calculate association indices for a population free-ranging individuals occurring in the Galveston Bay system, Texas, and adjacent Gulf Mexico. Thirty-five individual with four or more sightings per year included analyses ensure likelihood identification comparability 1990 1991. The patterns weak, few strong associations between individuals. average 1991 similar; however, magnitude changed...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 495:275-290 (2014) - DOI: https://doi.org/10.3354/meps10538 Baltic Sea harbour porpoise populations: status and conservation needs derived from recent survey results Harald Benke1, Stefan Bräger1,2, Michael Dähne1,4, Anja Gallus1, Sophie Hansen1, Christopher G. Honnef1, Martin Jabbusch1, Jens C. Koblitz1,*,...
Populations of the once common bottlenose dolphin (Tursiops truncatus) in Argentina have precipitously declined throughout country past decades. Unfortunately, local declines species are easily overlooked when establishing priorities for conservation. In this study, demographics what may well be last remaining resident population were assessed using mark-recapture analysis (Pollock's Robust Design) a photo-identification dataset collected during 2006-2011 Bahía San Antonio (Patagonia,...
ESR Endangered Species Research Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 18:265-278 (2012) - DOI: https://doi.org/10.3354/esr00448 Theme Section: Beyond marine mammal habitat modeling: applications for ecology and conservation Use of static passive acoustic monitoring assess status 'Critically Endangered' Baltic harbour porpoise in German waters Anja Gallus 1,*, Michael Dähne1,2,*,**,...
Abstract Compared to other stretches of the New Zealand coast, very little is known about cetacean fauna off West Coast South Island. The purpose this paper describe near‐shore distribution and abundance dolphins in that area by summarising results two major studies. Between February 1995 1997, 97 day trips were undertaken from Westport, Greymouth, Jackson Bay a small boat survey dolphins. July 1994 283 field days spent on water Doubtful Sound studying local bottlenose dolphin (Tursiops...
Capture-recapture techniques have been extensively used to estimate survival rates of Hector's dolphins at Banks Peninsula, but not abundance. We analyzed nine seasons photo-identification data using a model-fitting approach in the computer program MARK, and then MARK's estimates capture probabilities calculate abundance distinctive individuals. extrapolated these include unmarked individuals five on proportion identifiable this population, obtained from "random photography." This...
I investigated the relationship between White-fronted Terns (Sterna striata) associating with Hector's dolphins (Cephalorhynchus hectori) while feeding in near-shore environment of New Zealand. Associations were observed only austral spring and early summer. At this time up to 15.7% all dolphin groups accompanied by terns. The birds usually joined surface-feeding single terns apparently hovering over dolphins. Associated tern numbers positively correlated group size increased significantly...
Generating environmental baseline knowledge is a prerequisite for evaluating and predicting the effects of future deep seabed mining on seafloor in water column. Without baselines, we lack information against which to assess impacts therefore cannot decide whether or not they pose an acceptable risk marine environment. At present, International Seabed Authority (ISA), international regulator mining, requires contractors engaged mineral exploration establish geological baselines their...
Abstract The effectiveness of conservation measures such as marine protected areas (MPAs) for the cetaceans is determined by how well their home range or critical habitat covered. present study seeks to provide information on site‐fidelity and movement patterns individual bottlenose dolphins ( Tursiops truncatus ) in central Argentina. Between 2007 2013, photo‐identification data were collected four sites some 90–200 km apart from each other along Argentinean coast. Results show long‐term...
Most delphinids are very social and spend much time in the presence of conspecifics. The proportion co-occurrences any two individuals is usually measured by means association indices. In this study, "half-weight index" was used to describe patterns three previously unstudied populations Hector's dolphin, Cephalorhynchus hectori, around South Island New Zealand. For inclusion analysis were photoidentified repeatedly over a 2-year study period. Only about 1% individual associations dolphin...
Catastrophic natural events can have major impacts on marine ecosystems, but effects mobile predators, such as cetaceans, remain poorly understood. This study investigated whether the coastal distribution patterns of Hector’s dolphins Cephalorhynchus hectori off Kaikōura, New Zealand, changed after powerful Kaikōura earthquake in November 2016. Dolphin sightings from boat-based surveys conducted before (2013-2016) and (2016-2020) were binned into 18 sectors 4 km length each. The dolphins’...
Dolphins are agile animals and very difficult to measure at sea. However, for the conservation of threatened or endangered species, measurement may be vital because it allows a demographic analysis population. Hector's dolphin (Cephalorhynchus hectori) is rare species living only in coastal waters around New Zealand where studied from small boats. This paper describes stereophotogrammetric technique developed body length accurately sea without having capture individual. Constant calibration...
Recent years have seen a rapid increase in survey and sampling expeditions to the Clarion-Clipperton Zone (CCZ) abyssal plain, vast area of central Pacific that is currently being actively explored for deep-sea minerals (ISA, 2016). Critical development evidence-based environmental policy CCZ are data on biogeography connectivity species at CCZ-regional level. The London Workshop Biogeography Connectivity was convened support integration synthesis from European Union (EU) projects, supported...