[MARMAM] New publication: Behavioral event occurrence differs between behavioral states in Sotalia guianensis (Cetarctiodactyla: Delphinidae) dolphins: a multivariate approach

Rodrigo Tardin rhtardin at gmail.com
Mon Mar 24 11:30:14 PDT 2014

Dear all,

We are very happy to announce the following publication:

Tardin, R.H.; Plaza-Pinto, M.; Alves, M.A.S. & Simão, S.M. 2014. Behavioral
event occurrence differs between behavioral states in Sotalia guianensis
(Cetarctiodactyla: Delphinidae) dolphins: a multivariate approach. ZOOLOGIA

Abstract below. PDFs available upon request (Rodrigo Tardin -
rhtardin at gmail.com) or at ZOOLOGIA website (

ABSTRACT. Difficulties in quantifying behavioral events can cause loss of
information about cetacean behavior, especially behaviors whose functions
are still debated. The lack of knowledge is greater for South American
species such as
Sotalia guianensis (Van Benédén, 1864). Our objective was to contextualize
the behavioral events inside behavioral states using a Permutational
Multivariate Analysis of Variance (MANOVA). Three events occurred in the
Feeding, Socio-
Sexual and Travelling states (Porpoising, Side flop, Tail out dive), and
five events occurred in the Feeding and Travelling states (Back flop,
Horizontal jump, Lobtail, Spy-hop, Partial flop ahead). Three events (Belly
exposure, Club, and Heading) occurred exclusively in the Socio-sexual
state. Partial Back flop and Head flop occurred exclusively in the Feeding
state. For the events that occurred in multiple states, we observed that
some events occurred more frequently in one of the states (p < 0.001), such
as Lobtail, Tail out dive horizontal Jump, Partial flop ahead and Side
flop. Our multivariate analysis, which separated Socio-sexual behavior from
Feeding and Travelling, showed that the abundance of behavioral
events differs between states. This differentiation indicates that some
events are associated with specific behavioral states. Almost 40% of the
events observed were exclusively performed in one state, which indicates a
high specialization for some events. Proper discrimination and
contextualization of behavioral events may be efficient tools to better
understand dolphin behaviors. Similar studies in other habitats and with
other species, will help build a broader scenario to aid our understanding
of the functions of dolphin behavioral events.

Best regards,
Rodrigo Tardin

Doutorando em Ecologia e Evolução - IBRAG - UERJ
M.Sc em Biologia Animal - PPGBA - UFRRJ
Especialista em Docência do Ensino Superior - IAVM
Laboratório de Bioacústica e Ecologia de Cetáceos - UFRRJ/ IF/ DCA
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