Is There a Latitudinal Gradient in the Importance of Biotic Interactions

@article{Schemske2009IsTA,
  title={Is There a Latitudinal Gradient in the Importance of Biotic Interactions},
  author={Douglas W. Schemske and Gary G. Mittelbach and Howard V. Cornell and James M Sobel and Kaustuv Roy},
  journal={Annual Review of Ecology, Evolution, and Systematics},
  year={2009},
  volume={40},
  pages={245-269}
}
Biotic interactions are believed to play a role in the origin and maintenance of species diversity, and multiple hypotheses link the latitudinal diversity gradient to a presumed gradient in the importance of biotic interactions. Here we address whether biotic interactions are more important at low latitudes, finding support for this hypothesis from a wide range of interactions. Some of the best-supported examples are higher herbivory and insect predation in the tropics, and predominantly… 

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References

SHOWING 1-10 OF 184 REFERENCES
Multitrophic Level Interactions: Tritrophic interactions in tropical versus temperate communities
TLDR
This chapter reviews the literature on latitudinal gradients in diversity to determine if latitudinal trends exist for trophic controls to help clarify whether ecological para­ digms developed in temperate systems are useful for understanding trop­ ical systems.
LINKING BIOGEOGRAPHY AND COMMUNITY ECOLOGY: LATITUDINAL VARIATION IN PLANT–HERBIVORE INTERACTION STRENGTH
Ecological interactions may vary geographically as a function of diversity, density, or per capita interaction strengths, but we know little about the relative importance of these three mechanisms.
Evolution and the latitudinal diversity gradient: speciation, extinction and biogeography.
TLDR
Two major hypotheses for the origin of the latitudinal diversity gradient are reviewed, including the time and area hypothesis and the diversification rate hypothesis, which hold that tropical regions diversify faster due to higher rates of speciation, or due to lower extinction rates.
Latitudinal trends in plant‐pollinator interactions: are tropical plants more specialised?
TLDR
Two independent data sets are assembled which suggest that plant-pollinator interactions are not more ecologically specialised in the tropics compared to temperate latitudes, in contrast to a prevailing view that tropical ecological interactions tend towards higher specificity than their temperate counterparts.
Herbivore damage along a latitudinal gradient: relative impacts of different feeding guilds
TLDR
This study assesses the degree of chewing, sap-sucking and mining herbivory on Acacia falcata along its entire coastal latitudinal range (1150 km) in Australia and finds significant differences in phyllode toughness and specific leaf (phyllode) area among latitudes, but no significant differences among latitude in carbon: nitrogen.
Latitudinal gradients in species diversity: the search for the primary cause
TLDR
Hypotheses that attempt to explain latitudinal gradients in species diversity are reviewed and include explanations assuming different degrees of competition, mutualism, predation, epiphyte load, epidemics, biotic spatial heterogeneity, host diversity, population size, niche width, population growth rate, environmental harshness, and patchiness at different latitudes.
The life‐history basis of latitudinal diversity gradients: how do species traits vary from the poles to the equator?
TLDR
Many of the associations between life history and latitude were not detected by traditional cross-species analyses, highlighting the importance of incorporating phylogeny and overlap in studies of geographical life-history variation.
Why Are There So Many Species of Herbivorous Insects in Tropical Rainforests?
TLDR
Findings suggest that the latitudinal gradient in insect species richness could be a direct function of plant diversity, which increased sevenfold from the authors' temperate to tropical study sites.
On the Generality of the Latitudinal Diversity Gradient
TLDR
This analysis is the first to describe these general and significant patterns, which have important consequences for models aiming to explain the latitudinal gradient, which were weaker and less steep in freshwater than in marine or terrestrial environments and differed significantly between continents and habitat types.
LATITUDINAL DIFFERENCES IN PLANT PALATABILITY IN ATLANTIC COAST SALT MARSHES
TLDR
This work directly compared the palatability of 10 salt marsh plants from seven northern and eight southern coastal salt marshes by flying fresh plant material back and forth and allowing 13 species of herbivores direct choices between northern and southern nonspecific plants in laboratory assays, providing the most comprehensive evidence to date for a latitudinal gradient in plant palatable in any community.
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