Survival of Marbled Teal (Marmaronetta angustirostris) released back into the wild

Green, Andy J.; Fuentes, Cristina; Figuerola, Jordi; Viedma, Covadonga; Ramón, Natalia

doi:10.1016/j.biocon.2004.06.010

Cited by 27 publications

(26 citation statements)

References 27 publications

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“…The probability of metapopulation persistence was similar whether juveniles or adults were released, but the cost of releasing juvenile coots was almost half (if start‐up costs were included) to a quarter (after start‐up costs) of the cost of releasing adults. Managers overseeing the project had released juveniles because the behavior of other threatened waterbirds after long periods in captivity was different than that of wild birds (Green et al 2005), possibly leading to decreased survival and fecundity on release into the wild. Our results show that not only is it more prudent to release juveniles than adults for behavioral reasons, it is also cheaper.…”

Section: Discussionmentioning

confidence: 99%

Cost-Effectiveness of Translocation Options for a Threatened Waterbird

Martínez‐Abraín

Regan

Viedma

et al. 2011

Conservation Biology

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: Reintroduction of captive‐reared animals has become increasingly popular in recent decades as a conservation technique, but little is known of how demographic factors affect the success of reintroductions. We believe whether the increase in population persistence associated with reintroduction is sufficient to warrant the cost of rearing and relocating individuals should be considered as well. We examined the trade‐off between population persistence and financial cost of a reintroduction program for Crested Coots (Fulica cristata). This species was nearly extirpated from southern Europe due to unsustainable levels of hunting and reduction in amount and quality of habitat. We used a stochastic, stage‐based, single‐sex, metapopulation model with site‐specific parameters to examine the demographic effects of releasing juveniles or adults in each population for a range of durations. We parameterized the model with data from an unsuccessful reintroduction program in which juvenile captive‐bred Crested Coots were released between 2000 and 2009. Using economic data from the captive‐breeding program, we also determined whether the strategy that maximized abundance coincided with the least expensive strategy. Releasing adults resulted in slightly larger final abundance than the release of nonreproductive juveniles. Both strategies were equally poor in achieving a viable metapopulation, but releasing adults was 2–4 times more expensive than releasing juveniles. To obtain a metapopulation that would be viable for 30 years, fecundity in the wild would need to increase to the values observed in captivity and juvenile survival would need to increase to almost unity. We suggest that the most likely way to increase these vital rates is by increasing habitat quality at release sites.

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Section: Discussionmentioning

confidence: 99%

Cost-Effectiveness of Translocation Options for a Threatened Waterbird

Martínez‐Abraín

Regan

Viedma

et al. 2011

Conservation Biology

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“…Consequently, we have been unable to analyse the relationship between survival rates and clutch size, and how well interspecific variation in clutch characteristics is compatible with the life-time reproduction model. However, it is noteworthy that the species with the highest clutch size in the Old World (the marbled teal Marmaronetta angustirostris) appears to have an extremely low survival rate (Green 1998;Green et al 2005).…”

Section: Discussionmentioning

confidence: 99%

A comparative study of egg mass and clutch size in the Anseriformes

Figuerola

Green

2006

J Ornithol

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The factors explaining interspecific differences in clutch investment in precocial birds are poorly understood. We investigated how variations in clutch characteristics are related to environmental factors in a comparative study of 151 extant species of ducks, geese and swans (Anseriformes). Egg mass was negatively related to clutch size in a phylogenetic regression, a relationship that was much stronger when controlling for female mass. Nest placement was related to both egg size and clutch size, with cavity-nesting species laying more but smaller eggs. Egg size was positively correlated with incubation period and with female mass, and also with sexual size dimorphism (i.e. male mass relative to that of the female). Clutch size was not related to female mass. Species with long term pair bonds laid smaller clutches and larger eggs. The size of the breeding range was strongly positively correlated with clutch size and clutch mass, and its inclusion in multivariate models made other biogeographical variables (hemisphere, breeding latitude or insularity) non-significant. The small clutches in insular species appear to be a product of small range size rather than insularity per se. Our results suggest there is an evolutionary trade-off between clutch and egg size, and lend support to Lack's resource-limitation hypothesis for the waterfowl.

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“…The low mortality rate in comparison with other reintroduction projects (Green et al, 2005;Teixeira et al, 2007;Jule et al, 2008;Hamilton et al, 2010) may be a result of the close monitoring and high levels of individual care. Interactions with fisheries can also be an important threat to captiveraised manatees, and tracking teams should monitor spatialuse data closely.…”

Section: Discussionmentioning

confidence: 95%

Eighteen years of Antillean manatee Trichechus manatus manatus releases in Brazil: lessons learnt

Normande

Luna

Malhado

et al. 2014

Oryx

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The Antillean manatee Trichechus manatus manatus was once widespread from the south-eastern coast of Brazil to Central America and the Caribbean. In Brazil habitat destruction and overhunting severely reduced and fragmented the wild population, restricting extant subpopulations to the north and north-east coast. In response to these threats an ambitious government-led programme was initiated in 1994, with the aim of rehabilitating orphaned manatee calves and releasing them into the southernmost subpopulation. The programme is unique within Brazil, and has invested unprecedented resources in post-release monitoring. So far 30 manatees have been released at three sites, with a high rate of success (. 75%).Time in captivity appears to be a key variable determining post-release success: too long or too short a time in captivity decreasing the probability of survival. We describe the main features of this long-term programme and identify six key lessons learnt: (1) close monitoring, health assessments and rescues can significantly increase the success of releases, (2) combining different monitoring techniques results in high-quality data and reduces tracking costs, (3) long-term studies are needed to effectively evaluate the results, (4) releasing manatees at c. 5 years of age can increase chances of success, (5) soft-release is important to aid acclimatization, and (6) the programme has been effective in raising awareness among the general public, supporting education and fund-raising. This paper contains supplementary material that can be found online at

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Survival of Marbled Teal (Marmaronetta angustirostris) released back into the wild

Cited by 27 publications

References 27 publications

Cost-Effectiveness of Translocation Options for a Threatened Waterbird

Cost-Effectiveness of Translocation Options for a Threatened Waterbird

A comparative study of egg mass and clutch size in the Anseriformes

Eighteen years of Antillean manatee Trichechus manatus manatus releases in Brazil: lessons learnt

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