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Apr 06, 2023 185 likes •409 views

Mistletoe-host specificity can be mediated by seed predation caused by a wood borer insect Rodrigo Fadini 1, * , Ana Mellado 2 and Leidielly Ghizoni 1 1 Instituto de Biodiversidade e Florestas , Universidade Federal do Oeste do Par, Santarm,

SLIDE 1

Mistletoe-host specificity can be mediated by seed predation caused by a wood borer insect

Rodrigo Fadini1, *, Ana Mellado2 and Leidielly Ghizoni1

1 Instituto de Biodiversidade e Florestas , Universidade Federal do Oeste do Pará, Santarém, PA, Brazil 2Grupo de Ecología Terrestre, Universidad de Granada, Granada, Spain

rfadini@gmail.com www.rodrigofadini-lab.com

SLIDE 2

Introduction Host + specific* + mistletoe = 131 studies Host specificity  Mistletoe infection prevalence

SLIDE 3

Introduction

SLIDE 4

Introduction

Ehleringer et al. 1985

SLIDE 5

Photo: Alex Wild (www.alexanderwild.com)

Holes left by bark beetles

Ants colonizing a tree branch

Ants colonizing mistletoe haustorium

SLIDE 6

Insect Mistletoe seed

Photo: Ana Mellado

SLIDE 7

Pre-dispersal or post-dispersal? Seed predation differ among seeds planted on the branches of different tree species? Host defense mechanism  mistletoe-host specificity?

Our questions

SLIDE 8

SLIDE 9

Fadini and Lima 2012. Biotropica 44(1)

SLIDE 10

Planted seeds (os)

1 3 2

Intact fruits (if) Naturally dispersed seeds (nds)

Pre- or post-dispersal seed predation?

SLIDE 11

 Proportion

mistletoe seeds predated = propagule category + # propagules collected per host GLM with negative- binomial error distribution

SEED SCREENING

SLIDE 12

A. occidentale
B. virgilioides
B. crassifolia
H. fallax
L. pacari
S. convallariaeodora

Tree species planted with mistletoe seeds

SLIDE 13

Photo: Fábio Godoi

Hypothenemus sp.

SLIDE 14

fi sad snd categoria do propágulo 10 20 30 40 50 60 proporção de sementes predadas

0,5% 0,7% 18,9%

nds (Z=6,81, p˂0,001) ps (Z=-5,66, p˂0,001) if (Z=-3,4, p˂0,001)

BOTH BEETLES AND BEETLE HOLES

Proportion of seeds preyed by beetles Propagule category

If ps nds

SLIDE 15

Hypothenemus sp.

Tunnel excavated by Hypothenemus to reach the seed Region where the mistletoe seed was previously attached

SLIDE 16

Tree species

Anaocc Bowvir Byrcra Hymfal Lafpac Salcon

53% on average 26%

SLIDE 17

A host creates an enemy-free space for mistletoes by reducing seed predation caused by a woodboring beetle

Submitted to Biotropica.

SLIDE 18

SLIDE 19

Resin production by the host tree Beetle abundance

n host branches

Survivorship

f mistletoe

seeds

+ (host recognition) Our conceptual hypothesis

(mistletoe deterrence)
19

(1) (2) (3) (4)

SLIDE 20

Acknowledgements

SLIDE 21

Mistletoe-host specificity can be mediated by seed predation caused by a wood borer insect

Rodrigo Fadini1, *, Ana Mellado2 and Leidielly Ghizoni1

Introduction Host + specific* + mistletoe = 131 studies Host specificity  Mistletoe infection prevalence

Introduction

Introduction

Holes left by bark beetles

Ants colonizing a tree branch

Ants colonizing mistletoe haustorium

Pre-dispersal or post-dispersal? Seed predation differ among seeds planted on the branches of different tree species? Host defense mechanism  mistletoe-host specificity?

Our questions

Pre- or post-dispersal seed predation?

 Proportion

mistletoe seeds predated = propagule category + # propagules collected per host GLM with negative- binomial error distribution

Hypothenemus sp.

fi sad snd categoria do propágulo 10 20 30 40 50 60 proporção de sementes predadas

Proportion of seeds preyed by beetles Propagule category

Hypothenemus sp.

Tree species

A host creates an enemy-free space for mistletoes by reducing seed predation caused by a woodboring beetle

Submitted to Biotropica.

Resin production by the host tree Beetle abundance

Survivorship

seeds

+ (host recognition) Our conceptual hypothesis

Acknowledgements

Thank you!