Results 51 to 60 of about 48,587 (185)

Estimating Three‐Dimensional Posture to Correct Drone‐Based Measurements of Free‐Swimming Marine Mammals: An Application to Dugongs in Shallow Waters

Ecology and Evolution, Volume 16, Issue 10, October 2026.
Drone‐based measurements of free‐ranging aquatic wildlife are inevitably affected by posture variations, yet this issue has remained largely unaddressed. We developed a drone‐based method of estimating body measurements of dugongs using dual drones (positioned vertically and obliquely relative to the animal) whilst considering body posture.
Chiaki Yamato, Helen L. Sneath, Janet M. Lanyon   +2 more
wiley   +1 more source

Insult to Injury: Population Impacts of Sublethal Entanglement and Vessel Strikes of Common Bottlenose Dolphins (Tursiops truncatus) in Barataria Basin, Louisiana, 2011–2023

Marine Mammal Science, Volume 42, Issue 4, October 2026.
ABSTRACT Human interactions, specifically fishery entanglements (FI) and vessel strikes (VI), threaten marine mammals, including the Barataria Bay Estuarine System (BBE) Stock of common bottlenose dolphins (Tursiops truncatus). We reviewed whole‐body photographs to estimate the prevalence of sublethal entanglement and vessel strike scars for 227 ...
Eric S. Zolman, Todd Speakman, Jeanine Morey, Leslie Hart, Cynthia R. Smith, Wayne McFee, Lori Schwacke, Ryan Takeshita   +7 more
wiley   +1 more source

Acoustic parameters of Guiana Dolphin (Sotalia guianensis) whistles in the Southern Gulf of Venezuela

, 2016
The Guiana dolphin (Sotalia guianensis) is widely distributed along the coasts of Central and South America. Similar to other delphinids, this species emits echolocation clicks, burst pulses, and whistles. Although whistling seems to play a major role in
Chloe M. Nash, De Turris-Morales, Kareen, Delgado-Ortega, Gabriela, Héctor Barrios-Garrido, Espinoza-Rodríguez, Nínive, Nash, Chloe M., Barrios Garrido, Héctor, Kareen De Turris-Morales, Gabriela Delgado-Ortega, Nínive Espinoza-Rodríguez   +9 more
core   +1 more source

Behavioral event occurrence differs between behavioral states in Sotalia guianensis (Cetarctiodactyla: Delphinidae) dolphins: a multivariate approach

Zoologia (Curitiba), 2014
Difficulties in quantifying behavioral events can cause loss of information about cetacean behavior, especially behaviors whose functions are still debated.
Rodrigo H. Tardin, Míriam P. Pinto, Maria Alice S. Alves, Sheila M. Simão   +3 more
doaj   +1 more source

Capture-recapture abundance estimate of Guiana dolphins in southeastern Brazil

Ciencias Marinas, 2012
The objective of this study was to estimate the abundance of Sotalia guianensis in Sepetiba Bay, southeastern Brazil, based on photographic identification of animals. Estimates of population size were obtained using capture-recapture models for a closed population.
M Freitas-Nery, S Marino-Simão
openaire   +2 more sources

Using Aerial Photogrammetry to Estimate Body Condition and Assess Sexual Dimorphism in Narwhals

Marine Mammal Science, Volume 42, Issue 4, October 2026.
ABSTRACT The Arctic is warming rapidly, impacting ice‐dependent species and communities that rely on them for resources. Body condition indices (BCI) are widely used to assess individual health within populations. We adapted the methodology to improve accessibility for estimating narwhal body condition from drone footage, using body length, body width,
Kirsten J. Désorcy, Jane M. Waterman, Courtney R. Shuert, James D. Roth, Marianne Marcoux   +4 more
wiley   +1 more source

Reproductive Biology and Growth Patterns of Pontoporia blainvillei (Artiodactyla, Pontoporiidae) From Santa Catarina State, Southern Brazil

Marine Mammal Science, Volume 42, Issue 4, October 2026.
ABSTRACT This study evaluated reproductive parameters and growth patterns of male and female franciscana dolphins, Pontoporia blainvillei, in Santa Catarina State, southern Brazil, between Franciscana Management Area (FMA) II and III. We analyzed ovarian and testicular characteristics, counted the tooth growth layer groups, and constructed growth ...
E. Cordeiro, R. L. Paitach, V. R. M. Conversani, G. Rogge‐Renner, P. V. Castilho, M. J. Cremer   +5 more
wiley   +1 more source

O uso do espaço influencia as relações do boto-cinza, Sotalia guianensis? [PDF]

, 2015
Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências Biológicas, Programa de Pós-Graduação em Ecologia, Florianópolis, 2015.As relações sociais entre os indivíduos de uma população são parte essencial da vida de animais ...
Campos, Luiza Beirão
core  

Using a social‐ecological macrosystems framework to understand how human activities alter ecological synchrony

People and Nature, Volume 8, Issue 9, Page 2902-2924, September 2026.
Abstract Different aspects of ecological systems, biotic or abiotic, often fluctuate in coordinated patterns over space and time. Such high concordance between ecological processes is often referred to as ecological synchrony. Human activities, including and beyond climate change, have the potential to alter ecological synchrony by disrupting or ...
Yiluan Song, Mallory Barnes, K. Ann Bybee‐Finley, Kyla M. Dahlin, Travis McDevitt‐Galles, Stephan B. Munch, Guillermo E. Ponce‐Campos, Casey Youngflesh, Benjamin Zuckerberg, Kai Zhu   +9 more
wiley   +1 more source

Habitat fragmentation and species extirpation in freshwater ecosystems; causes of range decline of the indus river dolphin (Platanista gangetica minor) [PDF]

, 2014
World Wildlife Fund-Pakistan -(http://www.wwfpak.org/) funded the interview surveys with support through the Pakistan Wetlands Project. The US Marine Mammal Commission (www.mmc.gov) provided funding to GB for reporting and analysis in grant number ...
Gill T. Braulik (599125), Uzma Noureen (599127), Uzma Noureen, Northridge, S.P., Simon P. Northridge (599128), Simon P Northridge, Arshad, M., Braulik, G.T., Gill T Braulik, Noureen, U., Masood Arshad, Masood Arshad (599126), Noureen Uzma, Braulik Gill T., Arshad Masood, Northridge Simon P., Northridge, S.P.; id_orcid, Braulik, G.T.; id_orcid   +17 more
core   +1 more source