Complex demographic heterogeneity from anthropogenic impacts in a coastal marine predator

Oró, Daniel; Álvarez, David; Velando, Alberto

doi:10.1002/eap.1679

Cited by 10 publications

(8 citation statements)

References 79 publications

(147 reference statements)

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“…However, in certain ecological contexts, a rare press event may trigger an unusual long-term or permanent regime change. For instance, the arrival of a single predator to a longtime predator-free small island (that can be considered a rare event) triggers a rare perturbation regime that would last the time the predator stays on the island (Oro et al 2018(Oro et al , 2023aPayo-Payo et al 2018).…”

Section: Rare Eventsmentioning

confidence: 99%

“…That failure, together with fluctuations of fertility occurring at the Ebro Delta, which was the main demographic source and the largest world population, affected metapopulation dynamics (Genovart et al 2018). The rare event of predator invasion offered us an opportunity to explore the demographic responses for vital rates and the consequences for population and metapopulation dynamics (Oro 2020;Oro et al 2023a). We did not observe a bust of fertility or survival because breeders responded behaviourally by selecting more protected breeding habitats (Payo-Payo et al 2018).…”

Section: A Long-term Demographic Study Case: the Audouin's Gullmentioning

confidence: 99%

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Rare events, ecological dynamics, and the importance of long-term demographic studies

Oro,

Doak,

Garcia

et al. 2024

Preprint

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While multiple reasons make long-term demographic studies disproportionally valuable, much of their importance comes from the ability to detect and quantify rare events. We argue here that rare events can be critical for understanding important ecological and evolutionary processes. We highlight the additive or interactive nature of anthropogenic rare events with environmental rare events that may cause outsized changes in vital rates and therefore in population dynamics. Rare events may also generate complex responses in populations due to interactions between demographic processes and evolutionary responses. Complex, non-linear dynamics of populations may include threshold, extreme responses such as long transients, tipping points, regime shifts and collapse. When occurring locally, rare events may also exacerbate spatial heterogeneity with consequences for demographic processes. In sum, these effects represent substantial challenges for prediction, especially when considering the increase in the frequency of rare extreme events, and emphasise the need for long-term studies. Our perspective attempts to integrate the occurrence of rare events in variable environments and the consequences for the overall fitness, growth rates, and the spatial-temporal dynamics of populations.

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Section: Rare Eventsmentioning

confidence: 99%

Section: A Long-term Demographic Study Case: the Audouin's Gullmentioning

confidence: 99%

Rare events, ecological dynamics, and the importance of long-term demographic studies

Oro,

Doak,

Garcia

et al. 2024

Preprint

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“…when environmental conditions are poor and food becomes scarce (Castillo-Guerrero and Mellink 2011;Paiva et al 2017;Miller et al 2018). It is therefore important to explore the influence of climate on the foraging ecology of both sexes in seabirds, to highlight demographic heterogeneities with potential consequences for population dynamics (Oro et al 2010(Oro et al , 2018Patrick and Weimerskirch 2014).…”

Section: Electronic Supplementary Materialsmentioning

confidence: 99%

Foraging ecology of a marine top predator in the Eastern Tropical Pacific over 3 years with different ENSO phases

Lerma¹,

Castillo-Guerrero

Hernández‐Vázquez

et al. 2020

Mar Biol

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The El Niño Southern Oscillation (ENSO) is a recurrent climatic pattern with important ecological consequences for seabirds due to its impacts on the abundance and distribution of food resources. We investigated the effects of ENSO phases on the foraging ecology of a marine top predator at Clarion Island in the Eastern Tropical Pacific using GPS and time-depth recorder data and regurgitates from incubating masked boobies (Sula dactylatra) during 3 consecutive years. Foraging locations were recorded in 2016 (El Niño, one female, three males), 2017 (neutral; six females, nine males), and 2018 (La Niña; eight females, ten males). Local sea surface temperature (SST) and chlorophyll-a concentration (CHL) within the birds’ foraging range were compared among the 3 years. Regurgitates were collected opportunistically from 25 and 31 incubating adults in 2017 and 2018, respectively. Average local CHL and SST were similar among years (mean SST 25 °C; mean CHL 0.10 and of 0.09 mg m−3 in January and March, respectively). Masked boobies travelled a maximum of 66 ± 34 km from the colony. The maximum trip duration was 7.7 ± 3.4 h and total distance travelled during a foraging trip was 164 ± 73 km, with no sex- or year-related differences. Masked boobies mainly caught flying fish, but their diet also included one squid and six other fish families. In contrast to previously reported changes in foraging ecology of seabirds, masked boobies at Clarion Island seemed to be unaffected during El Niño, because the local oceanography was relatively unperturbed by ENSO oscillations.

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“…Variation in vital rates that drive population change have been studied in a wide range of bird and mammal species (e.g., Dahlgren et al., 2016 ; Dugger et al., 2016 ; Forrester & Wittmer, 2013 ; Hostetler et al., 2021 ), revealing sex‐related differences in basic biology and ecology (Clutton‐Brock et al., 2002 ; Eberhart‐Phillips et al., 2018 ). Sex‐related differences in annual survival have been well‐documented among avian taxa exhibiting a range of life‐history strategies (e.g., Ferrer & Hiraldo, 1992 ; Grüebler et al., 2008 ; Oro et al., 2018 ). Often the sex investing the most time and energy in offspring is exposed to a higher risk of mortality resulting in lower annual survival (Lack, 1968 ; Payevsky, 2021 ).…”

Section: Introductionmentioning

confidence: 99%

Sex‐specific recruitment rates contribute to male‐biased sex ratio in Adélie penguins

Morandini,

Dugger,

Schmidt

et al. 2024

Ecology and Evolution

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Sex‐related differences in vital rates that drive population change reflect the basic life history of a species. However, for visually monomorphic bird species, determining the effect of sex on demographics can be a challenge. In this study, we investigated the effect of sex on apparent survival, recruitment, and breeding propensity in the Adélie penguin (Pygoscelis adeliae), a monochromatic, slightly size dimorphic species with known age, known sex, and known breeding history data collected during 1996–2019 (n = 2127 birds) from three breeding colonies on Ross Island, Antarctica. Using a multistate capture–mark–recapture maximum‐likelihood model, we estimated apparent survival (), recapture (resighting) probability (), and the probability of transitioning among breeding states and moving between colonies (; colony‐specific non‐juvenile pre‐breeders, breeders, and non‐breeders). Survival rate varied by breeding status and colony, but not sex, and pre‐breeders had higher survival rates than breeders and non‐breeders. Females had a higher probability of recruiting into the breeding population each year and may enter the breeding pool at younger ages. In contrast, both sexes had the same probability of breeding from year to year once they had recruited. Although we detected no direct sex effects on survival, the variation in recruitment probability and age‐at‐first reproduction, along with lower survival rates of breeders compared to pre‐breeders, likely leads to shorter lifespans for females. This is supported by our findings of a male‐biased mean adult sex ratio (ASR) of 1.4 males for every female ( proportion of males = 0.57, SD = 0.07) across all colonies and years in this metapopulation. Our study illustrates how important it can be to disentangle sex‐related variation in population vital rates, particularly for species with complex life histories and demographic dynamics.

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Complex demographic heterogeneity from anthropogenic impacts in a coastal marine predator

Cited by 10 publications

References 79 publications

Rare events, ecological dynamics, and the importance of long-term demographic studies

Rare events, ecological dynamics, and the importance of long-term demographic studies

Foraging ecology of a marine top predator in the Eastern Tropical Pacific over 3 years with different ENSO phases

Sex‐specific recruitment rates contribute to male‐biased sex ratio in Adélie penguins

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