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The upsizing of the São Tomé seed dispersal network by introduced animals.

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Title: The upsizing of the São Tomé seed dispersal network by introduced animals.
Authors: Heleno, Ruben H.1 (AUTHOR) rheleno@uc.pt, Mendes, Filipa1 (AUTHOR), Coelho, Ana P.2,3 (AUTHOR), Ramos, Jaime A.2 (AUTHOR), Palmeirim, Jorge M.4 (AUTHOR), Rainho, Ana2 (AUTHOR), de Lima, Ricardo F.2 (AUTHOR)
Source: Oikos. Feb2022, Vol. 2022 Issue 2, p1-12. 12p.
Subjects: Introduced animals, Seed dispersal, Biological invasions, Biological extinction, Plant invasions, Seed size, Bats
Geographic Terms: Gulf of Guinea
Abstract: Biological invasions are a major threat to global biodiversity with particularly deleterious consequences on oceanic islands. The introduction of large terrestrial animals – generally absent on islands – can disrupt important ecosystem functions, such as the dispersal of native seeds. However, while the consequences of plant invasions received much attention, the potential of introduced animals to change insular seed dispersal networks remains largely unknown. Here, we collated evidence from five sampling methods to assemble qualitative and quantitative, multi‐guild seed dispersal network for the island of São Tomé (Gulf of Guinea) and explore whether native and introduced seed dispersers consistently differ in their topological roles, in their gape width and in the size of the dispersed seeds. Our network included 428 interactions between 23 dispersers (14 birds, 2 bats, 1 snake and 6 non‐flying mammals) and 133 plant species. Each method (direct observations, identification of seeds in droppings and stomachs, questionnaires and literature review) was particularly informative for a small group of dispersers, thus rendering largely complementary information. Native and introduced dispersers did not differ in their topological position in either qualitative or quantitative networks (linkage level, specialization d' and species strength). However, introduced dispersers tend to have much larger gape widths and to disperse significantly larger seeds. Our results point to a general upsizing of the seed dispersal network in the island of São Tomé driven by the recent arrival of large, introduced animals. We argue that this pattern is likely common on other oceanic islands where introduced dispersers might counteract the general pattern of seed dispersal downsizing resulting from the selective extinction of larger animals. [ABSTRACT FROM AUTHOR]
Copyright of Oikos is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: The upsizing of the São Tomé seed dispersal network by introduced animals.
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  Data: <searchLink fieldCode="AR" term="%22Heleno%2C+Ruben+H%2E%22">Heleno, Ruben H.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> rheleno@uc.pt</i><br /><searchLink fieldCode="AR" term="%22Mendes%2C+Filipa%22">Mendes, Filipa</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Coelho%2C+Ana+P%2E%22">Coelho, Ana P.</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ramos%2C+Jaime+A%2E%22">Ramos, Jaime A.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Palmeirim%2C+Jorge+M%2E%22">Palmeirim, Jorge M.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Rainho%2C+Ana%22">Rainho, Ana</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22de+Lima%2C+Ricardo+F%2E%22">de Lima, Ricardo F.</searchLink><relatesTo>2</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Oikos%22">Oikos</searchLink>. Feb2022, Vol. 2022 Issue 2, p1-12. 12p.
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  Data: <searchLink fieldCode="DE" term="%22Gulf+of+Guinea%22">Gulf of Guinea</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Biological invasions are a major threat to global biodiversity with particularly deleterious consequences on oceanic islands. The introduction of large terrestrial animals – generally absent on islands – can disrupt important ecosystem functions, such as the dispersal of native seeds. However, while the consequences of plant invasions received much attention, the potential of introduced animals to change insular seed dispersal networks remains largely unknown. Here, we collated evidence from five sampling methods to assemble qualitative and quantitative, multi‐guild seed dispersal network for the island of São Tomé (Gulf of Guinea) and explore whether native and introduced seed dispersers consistently differ in their topological roles, in their gape width and in the size of the dispersed seeds. Our network included 428 interactions between 23 dispersers (14 birds, 2 bats, 1 snake and 6 non‐flying mammals) and 133 plant species. Each method (direct observations, identification of seeds in droppings and stomachs, questionnaires and literature review) was particularly informative for a small group of dispersers, thus rendering largely complementary information. Native and introduced dispersers did not differ in their topological position in either qualitative or quantitative networks (linkage level, specialization d' and species strength). However, introduced dispersers tend to have much larger gape widths and to disperse significantly larger seeds. Our results point to a general upsizing of the seed dispersal network in the island of São Tomé driven by the recent arrival of large, introduced animals. We argue that this pattern is likely common on other oceanic islands where introduced dispersers might counteract the general pattern of seed dispersal downsizing resulting from the selective extinction of larger animals. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Oikos is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=155005473
RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1111/oik.08279
    Languages:
      – Code: eng
        Text: English
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        PageCount: 12
        StartPage: 1
    Subjects:
      – SubjectFull: Introduced animals
        Type: general
      – SubjectFull: Seed dispersal
        Type: general
      – SubjectFull: Biological invasions
        Type: general
      – SubjectFull: Biological extinction
        Type: general
      – SubjectFull: Plant invasions
        Type: general
      – SubjectFull: Seed size
        Type: general
      – SubjectFull: Bats
        Type: general
      – SubjectFull: Gulf of Guinea
        Type: general
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      – TitleFull: The upsizing of the São Tomé seed dispersal network by introduced animals.
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              Text: Feb2022
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              Y: 2022
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