Exotic birds show lags in population growth

Aagaard, Kevin; Lockwood, Julie L.

doi:10.1111/ddi.12175

Cited by 39 publications

(32 citation statements)

References 15 publications

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“…Areas with high invasion risks where non‐native species have not been reported could be sites not yet invaded. In fact, the occurrence of lag phases typical of alien populations––estimated between 10 and 38 years for birds––suggests that currently rare alien species may exhibit a strong increase in numbers and geographic extent later (Aagaard & Lockwood ). This may explain the major role of the year of first importation in present‐day occurrences of studied species.…”

Section: Discussionmentioning

confidence: 99%

Regional Bans on Wild‐Bird Trade Modify Invasion Risks at a Global Scale

Cardador

Lattuada

Strubbe

et al. 2017

CONSERVATION LETTERS

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Wildlife trade is currently the most important and increasing source of vertebrate invasive species. However, exhaustive analyses of potential side effects of trade regulations on this pathway of introduction are lacking. We addressed this by combining environmental niche models and global trade data on parrots (Psittaciformes), one of the most widely traded and worldwide invasive taxa. We used the wild bird trade bans of United States (1992) and Europe (2005) as case-studies. Results showed that regional bans can generate geographic redirections in trade, with important consequences on worldwide invasion risk. While the amount of parrots traded internationally remained largely constant, changes in trade destination occurred. Consequently, the world surface predicted at risk of parrot invasions increased with successive bans. Of concern, a redirection of trade toward developing countries was observed. Attention should be paid on the mismatch between the global requirements of invasion management and the regional scales governing trade regulations.

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Section: Discussionmentioning

confidence: 99%

Regional Bans on Wild‐Bird Trade Modify Invasion Risks at a Global Scale

Cardador

Lattuada

Strubbe

et al. 2017

CONSERVATION LETTERS

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“…). In contrast, examples of invasive animal populations erupting in response to directional environmental change are relatively rare (Aagaard and Lockwood ).…”

Section: Introductionmentioning

confidence: 99%

Outbreak of an undetected invasive species triggered by a climate anomaly

2016

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Abstract. When an invasive species appears at a new location, we typically have no knowledge of the population dynamics leading up to that moment. Is the establishment of invasive propagules closely followed by the appearance of the population? Or alternatively, was there an established low-density population that was released from a constraint and crossed the detection threshold? The early stages of the invasion process are a critical gap in our knowledge, yet vitally important for the detection and management of invasions. Here, we present multiple lines of evidence supporting the lag scenario for an invasive species outbreak. The invasive predatory zooplankton, spiny water flea (Bythotrephes longimanus), was detected in Lake Mendota, Wisconsin (USA), in summer of 2009 and rapidly reached and sustained exceptionally high densities. To evaluate whether Bythotrephes' outbreak immediately followed introduction or erupted from an established low-density population, we constructed a population model of Bythotrephes in Lake Mendota. In the model, Bythotrephes persisted indefinitely at low levels until favorable thermal conditions in 2009, the coolest July since at least 1895, allowed it to erupt to high densities and establish a large egg bank in the lake sediments. The egg bank stabilized the population in the high-density state despite a return to nonfavorable thermal conditions, which is further supported by demographic data suggesting a constant contribution from the egg bank during the year. The prolonged lag scenario is corroborated by the detection of two individual Bythotrephes in pre-2009 archived samples, and the detection of Bythotrephes spines in lake sediment core layers dating back to 1994 (AE5 yr). Together, our results suggest that Bythotrephes persisted for at least a decade below the detection limit, until optimal thermal conditions triggered a population outbreak. This work highlights the potential for environmental conditions to trigger invasive species outbreaks from low-density populations.

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“…Mack et al 2000;Rilov et al 2004). These seemingly dormant periods may range from a few years to several centuries (Whitney and Gabler 2008) and they have been documented in taxa such as plants (Larkin 2012), invertebrates (Rilov et al 2004;Witte et al 2010), and vertebrates (Aagaard and Lockwood 2014). The notion of lag, however, has been used in different ways among authors, and it broadly refers to either the delayed onset or relatively slow rate of an invasion process (Crooks 2011).…”

Section: Introductionmentioning

confidence: 99%

Lag times in Lessepsian fish invasion

et al. 2016

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Insight from theory has shown the usefulness of considering time lags in both plant and animal invasions, but this topic has yet to be fully explored with real examples. Here we define and investigate several types of lags using Red Sea fish invasions of the Mediterranean as a case study. By exploring both conceptual and analytical aspects of time lags, we suggest that this concept can be applied to both the ecology and management of invasions. Through the review of available literature and by compiling a comprehensive geo-referenced database, we show that our understanding of the temporal nature of invasion can be confounded by our varying capability to perceive it. This deep, sometimes inextricable, connection between the temporal nature of a process and its observation represents a critical issue for our understanding of the Lessepsian phenomenon, and is a challenge for invasion biology more generally. While our case study is associated with a very specific date in which the Suez Canal opened, our framework is expected to broaden the notion of time lags in bioinvasions research.

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Exotic birds show lags in population growth

Cited by 39 publications

References 15 publications

Regional Bans on Wild‐Bird Trade Modify Invasion Risks at a Global Scale

Regional Bans on Wild‐Bird Trade Modify Invasion Risks at a Global Scale

Outbreak of an undetected invasive species triggered by a climate anomaly

Lag times in Lessepsian fish invasion

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