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Diversity of Protists II01:27

Diversity of Protists II

Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...
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Related Experiment Video

Updated: Jun 27, 2026

VacuSIP, an Improved InEx Method for In Situ Measurement of Particulate and Dissolved Compounds Processed by Active Suspension Feeders
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Published on: August 3, 2016

Why do dolphins carry sponges?

Janet Mann1, Brooke L Sargeant, Jana J Watson-Capps

  • 1Department of Biology, Georgetown University, Washington, DC, USA. mannj2@georgetown.edu

Plos One
|December 11, 2008
PubMed
Summary
This summary is machine-generated.

Bottlenose dolphins in Shark Bay use sponges as tools, a rare behavior offering insights into animal cognition. Despite costs like solitary living, tool-using dolphins show similar calving success, suggesting complex trade-offs in this learned behavior.

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Published on: January 11, 2015

Area of Science:

  • Marine biology
  • Animal behavior
  • Cognitive ethology

Background:

  • Tool use in wild animals is rare and linked to cognition, social learning, and culture.
  • Quantifying tool use costs and benefits is challenging due to population-wide behavior.

Purpose of the Study:

  • To investigate the costs and benefits of marine sponge tool use in bottlenose dolphins.
  • To document transmission patterns of tool use within a dolphin population.
  • To understand the ecological and social drivers of tool use variation.

Main Methods:

  • Comparison of "sponger" (tool-using) and "non-sponger" female bottlenose dolphins.
  • Analysis of social structure, habitat use, diving behavior, foraging effort, and calving success.
  • Assessment of the ontogeny and transmission of sponging behavior.

Main Results:

  • Sponger females exhibited more solitary behavior, utilized deep water channels, and spent more time foraging and diving.
  • Calving success did not significantly differ between sponger and non-sponger females.
  • Sponging behavior showed a clear female bias in its development and was primarily transmitted vertically.

Conclusions:

  • Tool use in dolphins involves trade-offs between ecological demands and social factors.
  • The specialized behavior and associated costs help explain behavioral variation within the population.
  • Vertical transmission constrains the spread of this learned innovation.