Stochastic nature of larval dispersal at sea

Saenz‐Agudelo, Pablo; Harrison, Hugo B.

doi:10.1111/mec.15927

Cited by 2 publications

(2 citation statements)

References 17 publications

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“…However, processes occurring in the transition between larval and adult stages in stream insects that could generate density dependence need more study. Thus, although we should not discount a role for density‐dependent processes (Lowe & McPeek, 2014), our findings reflect the high likelihood that stochastic density‐independent processes can strongly affect the reproductive dispersal of organisms with open populations (Saenz‐Agudelo & Harrison, 2021).…”

Section: Discussionmentioning

confidence: 74%

“…Gaining better knowledge of both the mechanisms and organismal stage(s) involved in the regulation of the open populations of complex life cycle organisms has been hampered by the difficulty of empirical study (Saenz‐Agudelo & Harrison, 2021). Cohorts of organisms with such life cycles are notoriously difficult to follow because their transitions between habitats and small body sizes typically make quantitative evaluations of feedback processes involved in dynamics difficult to impossible (Lancaster & Downes, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Regulation of open populations of a stream insect through larval density dependence

McIntosh

Greig

Howard

2022

Journal of Animal Ecology

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In organisms with complex life cycles, the various stages occupy different habitats creating demographically open populations. The dynamics of these populations will depend on the occurrence and timing of stochastic influences relative to demographic density dependence, but understanding of these fundamentals, especially in the face of climate warming, has been hampered by the difficulty of empirical studies. Using a logically feasible organism, we conducted a replicated density‐perturbation experiment to manipulate late‐instar larvae of nine populations of a stream caddisfly, Zelandopsyche ingens, and measured the resulting abundance over 2 years covering the complete life cycle of one cohort to evaluate influences on dynamics. Negative density feedback occurred in the larval stage, and was sufficiently strong to counteract variation in abundance due to manipulation of larval density, adult caddis dispersal in the terrestrial environment as well as downstream drift of newly hatched and older larvae in the current. This supports theory indicating regulation of open populations must involve density dependence in local populations sufficient to offset variability associated with dispersal, especially during recruitment, and pinpoints the occurrence to late in the larval life cycle and driven by food resource abundance. There were large variations in adult, egg mass and early instar abundance that were not related to abundance in the previous stage, or the manipulation, pointing to large stochastic influences. Thus, the results also highlight the complementary nature of stochastic and deterministic influences on open populations. Such density dependence will enhance population persistence in situations where variable dispersal and transitioning between life stages frequently creates mismatches between abundance and the local availability of resources, such as might become more common with climate warming.

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Section: Discussionmentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Regulation of open populations of a stream insect through larval density dependence

McIntosh

Greig

Howard

2022

Journal of Animal Ecology

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Species' attributes predict the relative magnitude of ecological and genetic recovery following mass mortality

et al. 2022

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Theoretically, species' characteristics should allow estimation of dispersal potential and, in turn, explain levels of population genetic differentiation. However, a mismatch between traits and genetic patterns is often reported for marine species, and interpreted as evidence that life-history traits do not influence dispersal. Here, we couple ecological and genomic methods to test the hypothesis that species with attributes favouring greater dispersal potential-e.g., longer pelagic duration, higher fecundity and larger population size-have greater realized dispersal overall. We used a natural experiment created by a large-scale and multispecies mortality event which created a "clean slate" on which to study recruitment dynamics, thus simplifying a usually complex problem. We surveyed four species of differing dispersal potential to quantify the abundance and distribution of recruits and to genetically assign these recruits to probable parental sources. Species with higher dispersal potential recolonized a broader extent of the impacted range, did so more quickly and recovered more genetic diversity than species with lower dispersal potential. Moreover, populations of taxa with higher dispersal potential exhibited more immigration (71%-92% of recruits)than taxa with lower dispersal potential (17%-44% of recruits). By linking ecological with genomic perspectives, we demonstrate that a suite of interacting life-history and demographic attributes do influence species' realized dispersal and genetic neighbourhoods. To better understand species' resilience and recovery in this time of global change, integrative eco-evolutionary approaches are needed to more rigorously evaluate the effect of dispersal-linked attributes on realized dispersal and population genetic differentiation.

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Stochastic nature of larval dispersal at sea

Cited by 2 publications

References 17 publications

Regulation of open populations of a stream insect through larval density dependence

Regulation of open populations of a stream insect through larval density dependence

Species' attributes predict the relative magnitude of ecological and genetic recovery following mass mortality

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