Impact of habitat structure and fruit abundance on avian seed dispersal and fruit predation

2012 ◽  
Vol 13 (4) ◽  
pp. 347-354 ◽  
Author(s):  
Jörg Albrecht ◽  
Eike L. Neuschulz ◽  
Nina Farwig
Keyword(s):  
Seed Dispersal ◽  
Habitat Structure ◽  
Fruit Abundance ◽  
Avian Seed Dispersal

scholarly journals Defaunation precipitates the extinction of evolutionarily distinct interactions in the Anthropocene

2019 ◽  
Vol 5 (6) ◽  
pp. eaav6699 ◽  
Author(s):  
Carine Emer ◽  
Mauro Galetti ◽  
Marco A. Pizo ◽  
Pedro Jordano ◽  
Miguel Verdú
Keyword(s):  
Seed Dispersal ◽  
Evolutionary History ◽  
Bird Species ◽  
Forest Fragments ◽  
Ecological Interactions ◽  
Rescue Effect ◽  
History Of ◽  
Local Extinctions ◽  
Functional Features ◽  
Avian Seed Dispersal

Species on Earth are interconnected with each other through ecological interactions. Defaunation can erode those connections, yet we lack evolutionary predictions about the consequences of losing interactions in human-modified ecosystems. We quantified the fate of the evolutionary history of avian–seed dispersal interactions across tropical forest fragments by combining the evolutionary distinctness of the pairwise-partner species, a proxy to their unique functional features. Both large-seeded plant and large-bodied bird species showed the highest evolutionary distinctness. We estimate a loss of 3.5 to 4.7 × 104 million years of cumulative evolutionary history of interactions due to defaunation. Bird-driven local extinctions mainly erode the most evolutionarily distinct interactions. However, the persistence of less evolutionarily distinct bird species in defaunated areas exerts a phylogenetic rescue effect through seed dispersal of evolutionarily distinct plant species.

scholarly journals Intrinsic and extrinsic drivers of intraspecific variation in seed dispersal are diverse and pervasive

AoB Plants ◽  
2019 ◽  
Vol 11 (6) ◽  
Author(s):  
Eugene W Schupp ◽  
Rafal Zwolak ◽  
Landon R Jones ◽  
Rebecca S Snell ◽  
Noelle G Beckman ◽  
...  
Keyword(s):  
Seed Dispersal ◽  
Intraspecific Variation ◽  
Individual Variation ◽  
Habitat Structure ◽  
Ecological Context ◽  
Seed Colour ◽  
Crop Size ◽  
Starting Point ◽  
Evolutionary Consequences ◽  
Selection Of

Abstract There is growing realization that intraspecific variation in seed dispersal can have important ecological and evolutionary consequences. However, we do not have a good understanding of the drivers or causes of intraspecific variation in dispersal, how strong an effect these drivers have, and how widespread they are across dispersal modes. As a first step to developing a better understanding, we present a broad, but not exhaustive, review of what is known about the drivers of intraspecific variation in seed dispersal, and what remains uncertain. We start by decomposing ‘drivers of intraspecific variation in seed dispersal’ into intrinsic drivers (i.e. variation in traits of individual plants) and extrinsic drivers (i.e. variation in ecological context). For intrinsic traits, we further decompose intraspecific variation into variation among individuals and variation of trait values within individuals. We then review our understanding of the major intrinsic and extrinsic drivers of intraspecific variation in seed dispersal, with an emphasis on variation among individuals. Crop size is the best-supported and best-understood intrinsic driver of variation across dispersal modes; overall, more seeds are dispersed as more seeds are produced, even in cases where per seed dispersal rates decline. Fruit/seed size is the second most widely studied intrinsic driver, and is also relevant to a broad range of seed dispersal modes. Remaining intrinsic drivers are poorly understood, and range from effects that are probably widespread, such as plant height, to drivers that are most likely sporadic, such as fruit or seed colour polymorphism. Primary extrinsic drivers of variation in seed dispersal include local environmental conditions and habitat structure. Finally, we present a selection of outstanding questions as a starting point to advance our understanding of individual variation in seed dispersal.

Fruit resource tracking by hornbill species at multiple scales in a tropical forest in India

2015 ◽  
Vol 31 (6) ◽  
pp. 477-490 ◽  
Author(s):  
Rohit Naniwadekar ◽  
Charudutt Mishra ◽  
Aparajita Datta
Keyword(s):  
Seed Dispersal ◽  
Multiple Scales ◽  
Positive Association ◽  
Eastern Himalaya ◽  
Resource Tracking ◽  
Ripe Fruit ◽  
Intermediate Scale ◽  
Fruit Availability ◽  
Fruit Abundance ◽  
The Relationship

Abstract:The fruit-tracking hypothesis predicts a positive association between frugivores and fruit abundance over space and time. We documented hornbill diets and examined the relationship between fruit abundance and abundance of three hornbill species (Buceros bicornis, Rhyticeros undulatus and Aceros nipalensis) in the Eastern Himalaya from 2009–2012. The study was carried out at three scales: at the largest scale of the study area (15 km2), at the intermediate scale – eight 3-ha patches within the study area and at the smallest scale of individual fruiting trees. Ninety-one per cent of the 64 foraging sightings of the great hornbill were on figs while more than 50% of the foraging sightings of the wreathed (83) and rufous-necked hornbills (87) were on non-fig fruits. At the largest scale, wreathed hornbill abundance and ripe fruit abundance peaked in the non-breeding season. At the intermediate scale, wreathed hornbill abundance was positively associated with non-fig fruit availability while rufous-necked hornbill abundance was negatively associated with non-fig fruit availability. At the smallest scale, great and rufous-necked hornbill abundances were correlated with fig and non-fig fruit crop sizes, respectively. The three hornbill species track fruit availability at different scales based on diet, which has implications for their role in seed dispersal.

Avian Seed Dispersal in and Near Subtropical Rainforests.

1993 ◽  
Vol 20 (4) ◽  
pp. 535 ◽  
Author(s):  
RJ Green
Keyword(s):  
Seed Dispersal ◽  
National Parks ◽  
Rain Forest ◽  
New South ◽  
New South Wales ◽  
Seed Predators ◽  
South Wales ◽  
Avian Seed Dispersal ◽  
Seed Dispersers ◽  
Forest Plants

The behaviour of avian visitors to 23 species of subtropical Australian rain forest plants was observed in the Lamington and Border Ranges National Parks on the Queensland/New South Wales border to determine potentially important seed dispersers, seed predators and fruit thieves.

scholarly journals Avian seed dispersal in a mycoheterotrophic orchid Cyrtosia septentrionalis

Nature Plants ◽  
2015 ◽  
Vol 1 (5) ◽  
Author(s):  
Kenji Suetsugu ◽  
Atsushi Kawakita ◽  
Makoto Kato
Keyword(s):  
Seed Dispersal ◽  
Avian Seed Dispersal

EFFECTS OF AVIAN SEED DISPERSAL ON THE GENETIC STRUCTURE OF WHITEBARK PINE POPULATIONS

Evolution ◽  
1987 ◽  
Vol 41 (3) ◽  
pp. 607-612 ◽  
Author(s):  
Glenn R. Furnier ◽  
Peggy Knowles ◽  
Merlise A. Clyde ◽  
Bruce P. Dancik
Keyword(s):  
Genetic Structure ◽  
Seed Dispersal ◽  
Whitebark Pine ◽  
Avian Seed Dispersal
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