Small size does not restrain frugivory and seed dispersal across the evolutionary radiation of Galapagos lava lizards

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

DOI

  • Sandra Hervias-Parejo, Inst Mediterrani Estudis Avancats CSIC UIB, Consejo Superior de Investigaciones Cientificas (CSIC), CSIC - Instituto Mediterraneo de Estudios Avanzados (IMEDEA), Global Change Res Grp
  • ,
  • Ruben Heleno, Univ Coimbra, Universidade de Coimbra, Dept Life Sci, Ctr Funct Ecol
  • ,
  • Beatriz Rumeu, Inst Mediterrani Estudis Avancats CSIC UIB, Consejo Superior de Investigaciones Cientificas (CSIC), CSIC - Instituto Mediterraneo de Estudios Avanzados (IMEDEA), Global Change Res Grp
  • ,
  • Beatriz Guzman, Real Jardin Bot CSIC RJB, Consejo Superior de Investigaciones Cientificas (CSIC), CSIC - Real Jardin Botanico de Madrid
  • ,
  • Pablo Vargas, Real Jardin Bot CSIC RJB, Consejo Superior de Investigaciones Cientificas (CSIC), CSIC - Real Jardin Botanico de Madrid
  • ,
  • Jens M. Olesen
  • Anna Traveset, Inst Mediterrani Estudis Avancats CSIC UIB, Consejo Superior de Investigaciones Cientificas (CSIC), CSIC - Instituto Mediterraneo de Estudios Avanzados (IMEDEA), Global Change Res Grp
  • ,
  • Carlos Vera, Charles Darwin Foundation, Puerto Ayora, Santa Cruz, Galapagos
  • ,
  • Edgar Benavides, Yale Univ, Yale University, Dept Ecol & Evolutionary Biol
  • ,
  • Manuel Nogales, Inst Prod Nat & Agrobiol CSIC IPNA, Consejo Superior de Investigaciones Cientificas (CSIC), Isl Ecol & Evolut Res Grp

Frugivory in lizards is often assumed to be constrained by body size; only large individuals are considered capable of consuming fruits, with the potential of acting as seed dispersers. However, only one previous study has tested the correlation of frugivory with body and head size at an archipelago scale across closely related species. All nine lava lizards (Microlophus spp.) were studied on the eleven largest Galapagos islands from 2010 to 2016 to investigate whether frugivory is related to body and head size. We also tested whether fruit abundance influences fruit consumption and explored the effect of seed ingestion on seedling emergence time and percentage. Our results showed that across islands, lava lizards varied considerably in size (64-102 mm in mean snoutvent length) and level of frugivory (1-23%, i.e., percentage of droppings with seeds). However, level of frugivory was only weakly affected by size as fruit consumption was also common among small lizards. Lava lizards consumed fruits throughout the year and factors other than fruit abundance may be more important drivers of fruit selection (e.g., fruit size, energy content of pulp). From 2,530 droppings, 1,714 seeds of at least 61 plant species were identified, 76% of the species being native to the Galapagos. Most seeds (91%) showed no external structural damage. Seedling emergence time (44 versus 118 days) and percentage (20% versus 12%) were enhanced for lizard-ingested seeds compared to control (uningested) fruits. De-pulping by lizards (i.e., removal of pulp with potential germination inhibitors) might increase the chances that at least some seeds find suitable recruitment conditions. We concluded that lizards are important seed dispersers throughout the year and across the whole archipelago, regardless of body size.

OriginalsprogEngelsk
TidsskriftCurrent Zoology
Vol/bind65
Nummer4
Sider (fra-til)353-361
ISSN1674-5507
DOI
StatusUdgivet - aug. 2019

Se relationer på Aarhus Universitet Citationsformater

ID: 162911916