• Issue

    Journal of Animal Ecology: Volume 87, Issue 3

    527-889
    May 2018

IN FOCUS

Free Access

Hunger makes apex predators do risky things

  • Pages: 530-532
  • First Published: 13 April 2018
Hunger makes apex predators do risky things

Apex predators living near patches of residential housing switch from strong avoidance of these areas when hunting is good (well-fed) to no avoidance when they have not killed for some time (hungry), making them more likely to become involved in a human–carnivore conflict.

REVIEW

Free Access

A computer vision for animal ecology

  • Pages: 533-545
  • First Published: 07 November 2017
A computer vision for animal ecology

Ecologists are increasingly using image capture to bolster data collection. However, reviewing these images remains a bottleneck. Computer vision can increase the accuracy and efficiency of image review. The author outlines the goals, tools and applications of ecological computer vision to animal ecology.

Free Access

Disease implications of animal social network structure: A synthesis across social systems

  • Pages: 546-558
  • First Published: 15 December 2017
Disease implications of animal social network structure: A synthesis across social systems

Unique social network structures associated with species sociality mediate infectious disease risks. The authors perform a large-scale meta-analysis across social networks of 47 species, including mammals, birds, reptiles and fish to provide new perspectives on the disease costs of group living.

Open Access

Dynamic, spatial models of parasite transmission in wildlife: Their structure, applications and remaining challenges

  • Pages: 559-580
  • First Published: 25 September 2017
Dynamic, spatial models of parasite transmission in wildlife: Their structure, applications and remaining challenges

This paper provides a comprehensive overview of dynamic, spatial models and how they have contributed to understanding pathogen transmission in wildlife. It highlights patterns in the literature, possible integration with other ecological disciplines, and shows how spatial models can contribute to understanding changes in transmission patterns resulting from anthropogenic activity.

SYNTHESIS

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Novel insights on population and range edge dynamics using an unparalleled spatiotemporal record of species invasion

  • Pages: 581-593
  • First Published: 11 September 2017
Novel insights on population and range edge dynamics using an unparalleled spatiotemporal record of species invasion

The gypsy moth Slow the Spread programme has resulted in one of the most spatially and temporally detailed population datasets in existence. This paper reviews the profound opportunity this research has provided to the fields of population dynamics and invasion biology and appeals to a broad audience by showing the wide variety of research areas and ecological theory facilitated by a well-known invasive species. This synthesis also highlights how important ecological questions can be answered by thinking more broadly about monitoring data.

‘HOW TO ...’

Free Access

A practical guide for inferring reliable dominance hierarchies and estimating their uncertainty

  • Pages: 594-608
  • First Published: 30 October 2017
A practical guide for inferring reliable dominance hierarchies and estimating their uncertainty

Dominance hierarchies are widespread in nature. However, there are no clear guidelines about the sampling effort necessary for inferring reliable hierarchies, nor are there established tools for quantifying their uncertainty. The authors fill this gap of knowledge and provide researchers with an easy step-by-step guide on how to analyse dominance hierarchies.

BEHAVIOURAL ECOLOGY

Free Access

Hunger mediates apex predator's risk avoidance response in wildland–urban interface

  • Pages: 609-622
  • First Published: 30 January 2018
Hunger mediates apex predator's risk avoidance response in wildland–urban interface

Generalities portrayed in risk-avoidance response studies indicate that large mammalian predators normally avoid residential development, but do not explain the occasional conflict event in which predators utilize backyards. The authors demonstrate that residential development presents a risk-reward trade-off to puma and that risk avoidance behavior declines as hunger level increases.

Free Access

Sexual signal loss: The link between behaviour and rapid evolutionary dynamics in a field cricket

  • Pages: 623-633
  • First Published: 08 February 2018
Sexual signal loss: The link between behaviour and rapid evolutionary dynamics in a field cricket

A cricket unable to call is like a peacock without a tail. Nonetheless a trait silencing males has spread rapidly in Hawai'i, abetted by pre-existing behavioural plasticity manifest as flexible responses to social (particularly acoustic) information in the environment. Differential success of the trait in turn alters the social environment itself. The authors thank Norman Lee for the photograph.

CLIMATE ECOLOGY

Open Access

Soil temperature effects on the structure and diversity of plant and invertebrate communities in a natural warming experiment

  • Pages: 634-646
  • First Published: 25 January 2018
Soil temperature effects on the structure and diversity of plant and invertebrate communities in a natural warming experiment

The authors use a broad temperature gradient provided by indirect geothermal heating of the soil to show that diversity of plant and invertebrate communities decreases with warming. Moreover, invertebrate mean body size decreases and abundance increases, mediated by changes in plant community composition and differences in thermal tolerances of individual populations.

Free Access

Decreases in beetle body size linked to climate change and warming temperatures

  • Pages: 647-659
  • First Published: 30 January 2018
Decreases in beetle body size linked to climate change and warming temperatures

The study uses long-term collections of museum specimens to demonstrate that decreases in ground beetle body size over time are linked to increases in autumn temperatures. Field-collected beetles have decreased in size at a faster rate than predicted by laboratory experiments.

Free Access

Under the weather?—The direct effects of climate warming on a threatened desert lizard are mediated by their activity phase and burrow system

  • Pages: 660-671
  • First Published: 15 February 2018
Under the weather?—The direct effects of climate warming on a threatened desert lizard are mediated by their activity phase and burrow system

Whether the behavioural attributes of an organism can mitigate the effects of climate warming is critical knowledge when predicting its impact. The authors highlight the importance of considering the extent to which activity phase and microclimate can buffer individuals against thermal extremes when assessing the direct impacts of climate warming.

POPULATION ECOLOGY

Open Access

Density regulation in Northeast Atlantic fish populations: Density dependence is stronger in recruitment than in somatic growth

  • Pages: 672-681
  • First Published: 30 January 2018
Density regulation in Northeast Atlantic fish populations: Density dependence is stronger in recruitment than in somatic growth

This study compares for the first time systematically the strength of two major sources of density regulation in fish populations, recruitment and growth, revealing that density-dependent recruitment is dominating yet density-dependent growth is also common. These results are relevant for determining sustainable harvest and thus management of marine resources.

Free Access

Rethinking “normal”: The role of stochasticity in the phenology of a synchronously breeding seabird

  • Pages: 682-690
  • First Published: 26 December 2017
Rethinking “normal”: The role of stochasticity in the phenology of a synchronously breeding seabird

Changes in the timing of ecological events (phenology) are apparent in many systems. The role of stochastic factors in phenological processes, however, is often ignored. This study shows that breeding phenology varies over time in a colonial seabird, even in the absence of environmental variation.

Free Access

Validating dispersal distances inferred from autoregressive occupancy models with genetic parentage assignments

  • Pages: 691-702
  • First Published: 14 February 2018
Validating dispersal distances inferred from autoregressive occupancy models with genetic parentage assignments

This article provides an important contribution to metapopulation ecology because it is one of only a few studies that have validated dispersal distances inferred from occupancy data with direct measures of dispersal distance. Further, it presents methodology for a novel autoregressive occupancy modeling approach that accounts for imperfect detection and unsurveyed sites that could be used to improve estimates of occupancy, colonization, and extinction in future metapopulation studies.

PARASITE AND DISEASE ECOLOGY

Open Access

Experimental investigation of alternative transmission functions: Quantitative evidence for the importance of nonlinear transmission dynamics in host–parasite systems

  • Pages: 703-715
  • First Published: 07 November 2017
Experimental investigation of alternative transmission functions: Quantitative evidence for the importance of nonlinear transmission dynamics in host–parasite systems

The authors tested 10 candidate functions representing the transmission of trematode parasites to amphibian hosts using laboratory experiments varying the duration of exposure, numbers of parasites, numbers of hosts and parasite density. Nonlinear functions outperformed classical frequency- and density-dependent transmission functions and may provide more realistic predictions for infection.

Free Access

Invasion history alters the behavioural consequences of immune system activation in cane toads

  • Pages: 716-726
  • First Published: 30 January 2018
Invasion history alters the behavioural consequences of immune system activation in cane toads

The process of invasion is expected to alter the immune system of introduced species. The authors used a combination of field and laboratory experiments to compare the effect of immune system activation on dispersal of cane toads from range-edge and range-core populations.

EVOLUTIONARY ECOLOGY

Free Access

Ecological determinants of avian malaria infections: An integrative analysis at landscape, mosquito and vertebrate community levels

  • Pages: 727-740
  • First Published: 01 March 2018
Ecological determinants of avian malaria infections: An integrative analysis at landscape, mosquito and vertebrate community levels

Vector, host community and habitat characteristics have important but different impacts on the prevalence, richness and evenness of vector-borne parasites. However, the joint impact of these factors has been neglected. The authors’ results highlight the key role of biotic and abiotic variables in explaining the transmission dynamics of these pathogens.

Free Access

Why are tropical mountain passes “low” for some species? Genetic and stable-isotope tests for differentiation, migration and expansion in elevational generalist songbirds

  • Pages: 741-753
  • First Published: 06 November 2017
Why are tropical mountain passes “low” for some species? Genetic and stable-isotope tests for differentiation, migration and expansion in elevational generalist songbirds

Janzen's Rule predicts restricted elevational ranges for tropical montane species. On the west slope of the Peruvian Andes, a handful of songbird species defy this prediction. Tests of recent expansion, elevational movement and genetic divergence reveal that elevational generalism is unstable and fleeting. The exceptions prove Janzen's Rule. (Photo credits: Tom Kennedy, Troglodytes aedon; Dario Sanches, Zonotrichia capensis).

Free Access

Current spring warming as a driver of selection on reproductive timing in a wild passerine

  • Pages: 754-764
  • First Published: 16 January 2018
Current spring warming as a driver of selection on reproductive timing in a wild passerine

This paper shows a strong spring warming (+2°C) in a wild Mediterranean passerine bird population. This warming strengthens the selection to breed earlier, which could favour an adaptive response in avian breeding phenology since laying date is a heritable trait.

Free Access

Cuckoos host range is associated positively with distribution range and negatively with evolutionary uniqueness

  • Pages: 765-773
  • First Published: 22 January 2018
Cuckoos host range is associated positively with distribution range and negatively with evolutionary uniqueness

The authors showed that more generalist brood parasites occupied very different positions in a phylogenetic tree, suggesting that they have evolved independently within the Cuculiformes order. They provided new evidence that generalist species tend to occupy larger distribution ranges than more specialist species and also demonstrated that specialist cuckoo species represent more evolutionary heritage in the Cuculiformes order. The present study results highlight how species, which represent a larger evolutionary heritage within the order Cuculiformes, are also potentially more subject to conservation threats.

Free Access

Competition-driven niche segregation on a landscape scale: Evidence for escaping from syntopy towards allotopy in two coexisting sibling passerine species

  • Pages: 774-789
  • First Published: 11 February 2018
Competition-driven niche segregation on a landscape scale: Evidence for escaping from syntopy towards allotopy in two coexisting sibling passerine species

By exploiting a unique dataset on bird abundances combining large spatial coverage and fine resolution, the study using two sibling passerine species, the Thrush Nightingale (left) and the Common Nightingale (right), as a model system provides important insights into the role of interspecific competition in shaping species’ habitat preferences and hence distribution patterns and rules governing species’ coexistence.

COMMUNITY ECOLOGY

Free Access

Understanding the role of parasites in food webs using the group model

  • Pages: 790-800
  • First Published: 08 November 2017
Understanding the role of parasites in food webs using the group model

Arranging species into groups based on the similarity of their interactions yields a surprising overlap with classifications of trophic strategy. Remarkably, this level of similarity is not attainable by using any of the commonly appreciated local structural differences between parasites and species employing other trophic strategies, but instead requires incorporation of the global network structure.

Free Access

Related herbivore species show similar temporal dynamics

  • Pages: 801-812
  • First Published: 08 February 2018
Related herbivore species show similar temporal dynamics

In this article, the authors show that more closely related insect species have more similar temporal dynamics. Surprisingly, shared natural enemies and shared life-history traits did not explain similarity in the temporal dynamics. This finding has important implications for predicting insect outbreaks and for informing insect conservation.

Free Access

Dynamic occupancy modelling reveals a hierarchy of competition among fishers, grey foxes and ringtails

  • Pages: 813-824
  • First Published: 28 December 2017
Dynamic occupancy modelling reveals a hierarchy of competition among fishers, grey foxes and ringtails

Interspecific interactions among small carnivores are rarely studied, despite these animals being some of the most numerous carnivores in many ecosystems. The authors identified that small carnivores exhibit some degree of spatial partitioning and organize themselves in a hierarchy within their guild. Photo by Cale Myers.

SPATIAL ECOLOGY

Free Access

A camera-based method for estimating absolute density in animals displaying home range behaviour

  • Pages: 825-837
  • First Published: 15 December 2017
A camera-based method for estimating absolute density in animals displaying home range behaviour

The authors demonstrate from a theoretical perspective that the average number of animals counted per frame in a video recording survey is itself an unbiased estimate of animal density in the case of animals displaying home range behaviour, by overcoming the scepticism that recounting the same individuals could bias the estimates.

Free Access

Socially informed dispersal in a territorial cooperative breeder

  • Pages: 838-849
  • First Published: 18 January 2018
Socially informed dispersal in a territorial cooperative breeder

After leaving their natal territory, dispersing meerkats selectively use areas where they are less likely to encounter unrelated resident groups. This result stresses the importance of social circumstances for decision-making during dispersal, particularly in species where encounters with resident conspecifics are antagonistic.

TROPHIC INTERACTIONS

Free Access

More invaders do not result in heavier impacts: The effects of non-native bullfrogs on native anurans are mitigated by high densities of non-native crayfish

  • Pages: 850-862
  • First Published: 28 December 2017
More invaders do not result in heavier impacts: The effects of non-native bullfrogs on native anurans are mitigated by high densities of non-native crayfish

This paper represents a novel and important contribution to the ecological literature because it is the first to test the combined effects of two global invaders with different trophic positions on other native species by linking long-term field data in China and global trophic niche analyses.

Free Access

Foraging responses of sheep to plant spatial micro-patterns can cause diverse associational effects of focal plant at individual and population levels

  • Pages: 863-873
  • First Published: 11 February 2018
Foraging responses of sheep to plant spatial micro-patterns can cause diverse associational effects of focal plant at individual and population levels

This study provided experimental evidence that diverse associational effects of focal plants can result from the multiple-scale foraging decisions by large herbivores in response to plant within-patch distributions and can operate at plant individual and population scales. These results have important implications for understanding species coexistence and plant–herbivore interactions.

Free Access

Spatiotemporal heterogeneity in prey abundance and vulnerability shapes the foraging tactics of an omnivore

  • Pages: 874-887
  • First Published: 16 February 2018
Spatiotemporal heterogeneity in prey abundance and vulnerability shapes the foraging tactics of an omnivore

The authors provide evidence that predators can dynamically adjust their foraging tactics in response to changing prey abundance and vulnerability. Their work demonstrates the utility of integrating temporal dynamics of prey availability into investigations of predator–prey interactions, and moves towards a mechanistic understanding of the foraging tactics of an omnivore.

ERRATA

Free Access

Erratum

  • Pages: 888
  • First Published: 19 February 2018
Free Access

Erratum

  • Pages: 889
  • First Published: 19 February 2018