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CETACEAN ABUNDANCE IN HAWAIIAN WATERS ESTIMATED FROM A SUMMER/FALL SURVEY IN 2002
- J. Barlow
- 1 April 2006
The overall density of cetaceans is low in the study area, especially for delphinids, and the precision of density and abundance estimates is generally low for all species because of the low number of sightings.
A NEW BIRTH-INTERVAL APPROACH TO ESTIMATING DEMOGRAPHIC PARAMETERS OF HUMPBACK WHALES
A demographic model is developed based on interbirth intervals and is applied to estimate the population growth rate of humpback whales in the Gulf of Maine, and female survival rates are estimated from these same sighting data using a modified Jolly–Seber method.
LESSONS FROM MONITORING TRENDS IN ABUNDANCE OF MARINE MAMMALS
Scientists’ ability to detect declines of marine mammal stocks based on recent levels of survey effort is assessed, when the actual decline is precipitous, and alternatives to improve performance are recommended.
Techniques for cetacean-habitat modeling
Cetacean-habitat modeling, although still in the early stages of development, represents a potentially powerful tool for predicting cetacean distributions and understanding the ecological processes…
MODELING AGE‐SPECIFIC MORTALITY FOR MARINE MAMMAL POPULATIONS
A method is presented for estimating age-specific mortality based on minimal information: a model life table and an estimate of longevity. This approach uses expected patterns of mammalian…
ACOUSTIC IDENTIFICATION OF NINE DELPHINID SPECIES IN THE EASTERN TROPICAL PACIFIC OCEAN
Acoustic methods may improve the ability to identify cetacean species during shipboard surveys by adding prior probabilities that reflect species distribution to classification models, measuring alternative whistle variables, using alternative classification techniques, and by localizing vocalizing dolphins when collecting data for classification models.
Abundance and population density of cetaceans in the California Current ecosystem
This study provides the longest time series of abundance estimates that includes all the cetacean species in any marine ecosystem and will be used to interpret the impacts of human-caused mortality (such as that documented in fishery bycatch and that caused by ship strikes and other means) and to evaluate the ecological role of cetACEans in the California Current ecosystem.
A MODEL LIFE TABLE FOR BOTTLENOSE DOLPHINS (TURSIOPS TRUNCATUS) FROM THE INDIAN RIVER LAGOON SYSTEM, FLORIDA, U.S.A.
It is estimated that the overall annual mortality rate for this population of stranded bottlenose dolphins was 9.8% per year, and sex-specific differences in survivorship were apparent with females outliving males.
Design and field methods for sighting surveys of cetaceans in coastal and riverine habitats
Dolphins and porpoises in coastal and/or riverine habitats face serious conservation threats, yet surveys of their abundance are often especially difficult due to the challenges imposed by the…
Seasonal patterns in the abundance and distribution of California cetaceans
A method of drying synthetic rubber materials, which comprises contacting a moisture-containing synthetic rubber material with superheated steam at a temperature which is higher than the condensing…