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journal article Open Access Feb 01, 2023

Immigration as the main driver of population dynamics in a cryptic cetacean

Simone Tenan ORCID Aurelie Moulins Paola Tepsich Alessandro Bocconcelli Alessandro Verga Marco Ballardini Barbara Nani Daniela Papi Gabriella Motta Ana Sanz Aguilar Massimiliano Rosso
Ecology and Evolution Vol. 13 No. 2 · Wiley
View at Publisher Save 10.1002/ece3.9806
Abstract
AbstractEmpirical evidence about the role and interaction of immigration with local demographic processes in shaping population dynamics is still scarce. This knowledge gap limits our capability to derive a conceptual framework that can be used to inform conservation actions. Populations exposed to nonstationary environment do not converge to a stable stage distribution, implying the need for evaluating the demographic role of both vital rates and stage distribution using appropriate tools. This is particularly important for species with larger generation times like cetaceans. We explored the relative demographic role of vital rates and population structure of a poorly known cetacean, the Mediterranean Cuvier's beaked whale, while accounting for the exposure to nonstationary environments. We performed a retrospective analysis through transient life table response experiments (tLTRE) using demographic rates and population structure of both sexes obtained from an integrated population model. The contribution of immigration to variation in realized population growth rates was 4.2, 7.6, and 12.7 times larger than that of female apparent survival, proportional abundance of breeding females with a 2‐year‐old calf, and proportional abundance of breeding females with a 3‐year‐old calf, respectively. Immigration rate and proportional abundance of breeding females with a 2‐ or 3‐year‐old calf explained, respectively, 65% and 20% of total temporal variability in realized population growth rates. Changes in realized population growth rate between successive years were mainly driven by changes in immigration and population structure, specifically the proportional abundance of breeding females with a 2‐year‐old calf. Our study provides insight into the demographic processes that affect population dynamics and in a cryptic cetacean. We presented an analytical approach for maximizing the use of available data through the integration of multiple sources of information for individuals of different distinctiveness levels.
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14
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63
References
Details
Published
Feb 01, 2023
Vol/Issue
13(2)
License
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Authors
S
Simone Tenan

Institute of Marine Sciences (CNR‐ISMAR) National Research Council Venezia Italy

A
Aurelie Moulins

CIMA Research Foundation Savona Italy

P
Paola Tepsich

CIMA Research Foundation Savona Italy

A
Alessandro Bocconcelli

Advanced Ocean Physics Engineering Woods Hole Oceanographic Institution Woods Hole Massachusetts USA

A
Alessandro Verga

Golfo Paradiso srl Camogli (GE) Italy

M
Marco Ballardini

bluWest Imperia Italy

B
Barbara Nani

bluWest Imperia Italy

D
Daniela Papi

Golfo Paradiso srl Camogli (GE) Italy

G
Gabriella Motta

Consorzio Liguria Via Mare Genoa Italy

A
Ana Sanz Aguilar

Animal Demography and Ecology Unit, GEDA ‐ IMEDEA (CSIC‐UIB) Esporles Spain; Applied Zoology and Conservation Group University of the Balearic Islands Palma Spain

M
Massimiliano Rosso

CIMA Research Foundation Savona Italy

Cite This Article
Simone Tenan, Aurelie Moulins, Paola Tepsich, et al. (2023). Immigration as the main driver of population dynamics in a cryptic cetacean. Ecology and Evolution, 13(2). https://doi.org/10.1002/ece3.9806
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