Sabre D. Mahaffy
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View article: Accounting for spatiotemporal sampling bias in a long-term dataset establishes a decline in abundance of endangered false killer whales Pseudorca crassidens in the main Hawaiian Islands
Accounting for spatiotemporal sampling bias in a long-term dataset establishes a decline in abundance of endangered false killer whales Pseudorca crassidens in the main Hawaiian Islands Open
View article: Dynamics of foraging interactions between cookiecutter sharks (Isistius spp.) and short-finned pilot whales (Globicephala macrorhynchus) in Hawaiʻi
Dynamics of foraging interactions between cookiecutter sharks (Isistius spp.) and short-finned pilot whales (Globicephala macrorhynchus) in Hawaiʻi Open
Cookiecutter sharks ( Isistius spp. ) are small pelagic squaloid sharks found throughout tropical and sub-tropical waters that are known to feed opportunistically on a range of prey, including animals much larger than themselves. Short-fin…
View article: False killer whales and fisheries in Hawaiian waters: evidence from mouthline and dorsal fin injuries reveal ongoing and repeated interactions
False killer whales and fisheries in Hawaiian waters: evidence from mouthline and dorsal fin injuries reveal ongoing and repeated interactions Open
Monitoring bycatch in fisheries is essential for effective conservation and fisheries sustainability. False killer whales Pseudorca crassidens in Hawaiian waters are known to interact with both commercial and recreational fisheries, but li…
View article: Incorporating telemetry information into capture‐recapture analyses improves precision and accuracy of abundance estimates given spatiotemporally biased recapture effort
Incorporating telemetry information into capture‐recapture analyses improves precision and accuracy of abundance estimates given spatiotemporally biased recapture effort Open
Natural populations that are rare, cryptic or inaccessible provide a monumental challenge to monitoring, as adequate data are extremely difficult to collect. Surveys often encompass only a small portion of a population's range due to diffi…
View article: Dynamics of foraging interactions between cookiecutter sharks (Isistius spp.) and short-finned pilot whales (Globicephala macrorhynchus) in Hawaiʻi
Dynamics of foraging interactions between cookiecutter sharks (Isistius spp.) and short-finned pilot whales (Globicephala macrorhynchus) in Hawaiʻi Open
Cookiecutter sharks (Isistius spp.) are small pelagic squaloid sharks found throughout tropical and sub-tropical waters that are known to feed opportunistically on a range of prey, including animals much larger than themselves. Short-finne…
View article: False killer whales (Pseudorca crassidens Cetacea: Delphinidae) along the Pacific coast of Central America and Mexico: Long-term movements, association patterns and assessment of fishery interactions
False killer whales (Pseudorca crassidens Cetacea: Delphinidae) along the Pacific coast of Central America and Mexico: Long-term movements, association patterns and assessment of fishery interactions Open
Introduction: Worldwide, false killer whales (Pseudorca crassidens) are infrequently encountered, yet long-term studies have shown strong site fidelity as well as long-term associations among individuals in several locations. Detailed stud…
View article: A deep learning approach to photo–identification demonstrates high performance on two dozen cetacean species
A deep learning approach to photo–identification demonstrates high performance on two dozen cetacean species Open
Researchers can investigate many aspects of animal ecology through noninvasive photo–identification. Photo–identification is becoming more efficient as matching individuals between photos is increasingly automated. However, the convolution…
View article: Identifying social clusters of endangered main Hawaiian Islands false killer whales
Identifying social clusters of endangered main Hawaiian Islands false killer whales Open
The presence of distinct social groups within an animal population can result in heterogeneity in many aspects of its life history and ecology. The ability to accurately assess social group membership increases with the number of times ind…
View article: Biologically Important Areas II for cetaceans within U.S. and adjacent waters – Hawaiʻi Region
Biologically Important Areas II for cetaceans within U.S. and adjacent waters – Hawaiʻi Region Open
In this assessment we incorporated published and unpublished information to delineate and score Biologically Important Areas (BIAs) for cetaceans in the Hawaiʻi region following standardized criteria. Twenty-six cetacean species have been …
View article: Sexually dimorphic characteristics of short‐finned pilot whales, false killer whales, pygmy killer whales, and melon‐headed whales assessed using fin and body morphometrics from photographs taken at sea
Sexually dimorphic characteristics of short‐finned pilot whales, false killer whales, pygmy killer whales, and melon‐headed whales assessed using fin and body morphometrics from photographs taken at sea Open
Adults of many free‐ranging delphinid species cannot be reliably sexed at sea. Sexually mature, known‐sex adult short‐finned pilot, pygmy killer, melon‐headed, and false killer whales were profiled from at‐sea photos to assess proportional…
View article: Site fidelity, spatial use, and behavior of dwarf sperm whales in Hawaiian waters: using small‐boat surveys, photo‐identification, and unmanned aerial systems to study a difficult‐to‐study species
Site fidelity, spatial use, and behavior of dwarf sperm whales in Hawaiian waters: using small‐boat surveys, photo‐identification, and unmanned aerial systems to study a difficult‐to‐study species Open
Dwarf sperm whales ( Kogia sima ) have been studied rarely at sea. We used photo‐identification, boat‐ and drone‐based behavioral observations, and citizen science photo contributions to examine site fidelity, spatial use, and behavior in …
View article: Life history and social structure as drivers of persistent organic pollutant levels and stable isotopes in Hawaiian false killer whales (Pseudorca crassidens)
Life history and social structure as drivers of persistent organic pollutant levels and stable isotopes in Hawaiian false killer whales (Pseudorca crassidens) Open
View article: Fidelity to natal social groups and mating within and between social groups in an endangered false killer whale population
Fidelity to natal social groups and mating within and between social groups in an endangered false killer whale population Open
Most mammals exhibit natal dispersal of one or both sexes, a behavior that likely evolved in part to reduce the chances of breeding with close relatives. When natal social group fidelity of both sexes has been documented, the risk of inbre…
View article: Abundance estimates for management of endangered false killer whales in the main Hawaiian Islands
Abundance estimates for management of endangered false killer whales in the main Hawaiian Islands Open
Effectively using the best available data to meet management mandates for endangered populations is a common conservation challenge. False killer whales Pseudorca crassidens occur as 3 distinct populations in Hawaiian waters, including a r…
View article: Familial social structure and socially driven genetic differentiation in Hawaiian short‐finned pilot whales
Familial social structure and socially driven genetic differentiation in Hawaiian short‐finned pilot whales Open
Social structure can have a significant impact on divergence and evolution within species, especially in the marine environment, which has few environmental boundaries to dispersal. On the other hand, genetic structure can affect social st…