An improved model life table for the Indian River Lagoon bottlenose dolphin population and remarks on early mortality

Manfredi, Piero; Marangi, Luigi; Rossi, Alessia; Santangelo, Giovanni

doi:10.1111/mms.12334

Cited by 2 publications

(3 citation statements)

References 9 publications

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“…common bottlenose dolphins (Tursiops truncatus) (Manfredi, Marangi, Rossi, & Santangelo, 2016). Juvenile survival was similar to values found in the Faroe Islands, which ranged from 0.886 for 1 year olds to 0.947 for 5 year olds (Bloch et al, 1993).…”

Section: Survival Rate Estimatessupporting

confidence: 70%

“…Survival rate of younger age classes was lower than that for adults. The pattern of increasing survival rate with age classes is generally observed in long‐lived species such as killer whales ( Orcinus orca ) (Esteban et al, 2016) and common bottlenose dolphins ( Tursiops truncatus ) (Manfredi, Marangi, Rossi, & Santangelo, 2016). Juvenile survival was similar to values found in the Faroe Islands, which ranged from 0.886 for 1 year olds to 0.947 for 5 year olds (Bloch et al, 1993).…”

Section: Discussionmentioning

confidence: 99%

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Demographic parameters of a free‐ranging deep‐diving cetacean, the long‐finned pilot whale

Verborgh

Gauffier

Esteban

et al. 2020

Marine Mammal Science

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Demographic parameters provide baselines to estimate future population trajectories which can then be used in management decisions. The aim here was to estimate demographic parameters of long-finned pilot whale (Globicephala melas) from the Strait of Gibraltar by fitting mark-recapture models to photo-identification data of primary and secondary marked individuals. These parameters were used to forecast the future population trajectories in a population viability analysis (PVA) given different scenarios of demographic rates. Survival rate increased with age from 0.629, 95% CI [0.409, 0.805] for calves, 0.869, 95% CI [0.758, 0.934] for juveniles, to 0.972, 95% CI [0.953, 0.983] for adults. A preliminary mean observed interval of viable calves was 4.5 years. The PVA estimated the population would persist over 100 years with a 100% probability for all scenarios except those with lower 95% CI survival values, for which the probability of extinction reached 100%. Population growth rate was negative in all scenarios except those with 95% CI upper survival values. Interbirth interval and juvenile survival were found most influential and depended on the correct identification of secondary marked (e.g., calves and juveniles) individuals on a long-term basis.This population was found in a precarious state prior to a morbillivirus outbreak that might even more endanger its long-term viability.

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Section: Survival Rate Estimatessupporting

confidence: 70%

Section: Discussionmentioning

confidence: 99%

Demographic parameters of a free‐ranging deep‐diving cetacean, the long‐finned pilot whale

Verborgh

Gauffier

Esteban

et al. 2020

Marine Mammal Science

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show abstract

“…Life tables can also summarize birth and death rates of organisms in different stages of their lives, which therefore requires detailed knowledge of the reproduction, reproductive rates and early mortality rates occurring in the population under exam. By way of example, the following presents the results of studies (Manfredi et al, 2016; on female reproductive parameters and early mortality in the Eastern Ligurian Sea (Northwest Mediterranean) population of the bottlenose dolphin (Tursiops truncatus, Montagu, 1821).…”

Section: Life-history Tables Population Age Sex Structure and Reprodu...mentioning

confidence: 99%

Conservation of Long-Lived Marine Species: Some Hints for Adopting a Population Approach

Santangelo

2022

ACMAR

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Long-lived species, whose life-span can amply exceed one century, play a fundamental role within marine communities. However, due to the short time windows covered by most research our knowledge of their demography is quite limited, consequently severely limiting the possibility of understanding their complex dynamics over the long run. Moreover, several aspects of the life-history of long-lived populations are largely unknown. This short review describes some examples of demographic analyses in terrestrial ecology, which are then applied to long-lived marine species. The ultimate aim is to suggest that wider application of demographic concepts and models could improve our ability to understand how these populations might respond to unusual increases in mortality rates due to Global Climate Changes and other sources of anthropogenic disturbance. In this framework, close, continuous, reciprocal and dialectic interaction between population mathematicians and field marine ecologists could greatly help to both design the necessary research and set out improved population dynamic models for such species. Such models would constitute an important first step in increasing our knowledge, and thereby implementing management plans for fostering the conservation of long-lived marine species, which too frequently have been defined by international conservation authorities. Keywords: demography, mortality tables, life-tables, gorgonian corals, cetaceans.

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An improved model life table for the Indian River Lagoon bottlenose dolphin population and remarks on early mortality

Abstract: not uploaded because this is a short technical note to MMS for which abstract are not required

Cited by 2 publications

References 9 publications

Demographic parameters of a free‐ranging deep‐diving cetacean, the long‐finned pilot whale

Demographic parameters of a free‐ranging deep‐diving cetacean, the long‐finned pilot whale

Conservation of Long-Lived Marine Species: Some Hints for Adopting a Population Approach

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