[MARMAM] New publication: Intra- and interspecific niche partitioning in striped and common dolphins inhabiting the southwestern Mediterranean Sea

Joan Giménez Verdugo joan.gimenez at csic.es
Tue Mar 28 07:42:23 PDT 2017

Dear all,

We are pleased to announce the publication of the following paper in
"Marine Ecology Progress Series":

Giménez, J., Cañadas, A., Ramírez, F., Afán, I., García-Tiscar, S.,
Fernández-Maldonado, C., Castillo, JJ & de Stephanis, R. (2017). Intra-and
interspecific niche partitioning in striped and common dolphins inhabiting
the southwestern Mediterranean Sea. *Marine Ecology Progress Series*, *567*,

*Abstract:*Community structure and functioning is shaped by resource
partitioning between co-occurring species. Niche differentiation among
sympatric species can be reached through trophic, spatial or temporal
segregation to avoid competitive exclusion. Intraspecific segregation in
the use of habitats and resources might determine, in turn, a population’s
niche width and interspecific segregation. The Alboran Sea is the only area
in the Mediterranean where common and striped dolphins coexist abundantly.
Therefore, these putative competing species provided the opportunity to
investigate niche partitioning through spatial modelling and trophic
analysis. Density surface modelling and nitrogen and carbon stable isotopes
(δ15N and δ13C) were used to investigate spatial and trophic niche
partitioning at inter- and intraspecific levels. The 2 species showed high
isotopic overlap. However, we could not rule out the possibility of
interspecific trophic segregation, as isotopic similarity does not
necessarily mean true ecological or dietary similarity. Among conspecifics,
variations in δ15N and δ13C values with dolphin length pointed to
ontogenetic dietary changes in striped dolphins, while sex played only a
minor role in δ13C values. Spatially, these species tended to segregate
their core areas of distribution, with common dolphins being more coastal
than striped dolphins, which occupied adjacent, deeper waters. Overall, the
main enabler for the coexistence of common and striped dolphins in the
Alboran Sea was spatial segregation.
You can download the paper in:
 or visit my ResearchGate (https://www.researchgate.net/profile/Joan_Gimenez

Kind Regards,

*Joan Giménez Verdugo*
*PhD Student* *Severo Ochoa*
Estación Biológica de Doñana (EBD-CSIC)
Department of Conservation Biology
Americo Vespucio Ave, s/n
41092 Sevilla (Spain)
Research Gate: Joan Giménez
Phone: +34 619 176 849
ü Please consider the environment before printing this E-mail

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