The influence of stage-dependent dispersal on the population dynamics of three amphipod species

Munguia, Pablo; Mackie, Coleman; Levitan, Don R.

doi:10.1007/s00442-007-0762-7

Cited by 31 publications

(27 citation statements)

References 28 publications

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“…Although small juveniles are cheaper to produce (Vance ; Smith & Fretwell ; Marshall & Keough ), a small size could result in lower fecundity and reduction in mobility (Morand ; Iwasa & Wada ; Munguia et al . ). To overcome this tradeoff, many parasitic species show dramatic differences in body size at different infection stages such as host‐searching juveniles and offspring‐producing adults (Hechinger et al .…”

Section: Introductionmentioning

confidence: 97%

Sex change and morphological transitions in a marine ectoparasite

Cook

Munguia

2014

Marine Ecology

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The fitness of parasitic organisms is strongly driven by their ability to infect potential hosts. Although transmission to a host organism is a key component to the parasitic lifestyle, surviving and reproducing within a host poses additional challenges. Cymothoa excisa is a parasitic isopod that infects Atlantic croaker, Micropogonias undulatus, along the Texas coast and has evolved mechanisms to successfully survive and reproduce within its host. Cymothoa excisa is known to exhibit sex-change strategies but limited information exists on morphological changes, reproductive output and the timing at which sex change becomes optimal. This study collected Atlantic croaker during a 22-month survey period and identified parasite prevalence and intensity in the host fish population. Infection rates were constant throughout the year at 19.88% and intensity increased through the season up to a maximum of four parasites. Following collection, isopod morphological parameters were quantified for each life stage (including female, transitional, male and juvenile), identifying shape and size transitions through ontogeny and sex change. Transitional C. excisa isopods only occurred when only one isopod was present in a fish, suggesting that isopods change sex from male to female if they are the first to recruit to an uninfected host. As isopods transition to females they have a large increase in size, legs, and pleotelson (which influence fecundity and anchoring ability), whereas the gonopod, eyes and uropod show a reduction (which are no longer needed for swimming and finding hosts). Data suggest that C. excisa sex change is related to the timing of infection and brood size increases with female size and host size. Therefore, it would be advantageous to be the first isopod to infect a host, as it could change into a female and increase reproductive potential. We discuss hypotheses that could explain the mating behavior of parasitic isopods.

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Section: Introductionmentioning

confidence: 97%

Sex change and morphological transitions in a marine ectoparasite

Cook

Munguia

2014

Marine Ecology

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“…species diversity) and ecosystem (e.g. resource heterogeneity) scales, which all depend on the dispersal stage [6] and can have consequences for community composition, diversity and ecosystem function [21,27]. A temporal scale warrants attention given the short-term effects arising from temporal sinks and the effects of dispersal and quality of source populations on selection.…”

Section: Discussionmentioning

confidence: 99%

“…occurring at the source quality and number of dispersing propagules affect gene flow [23]; habitat selection and distribution [18,23]; dispersal distance [13]; demographics [19] occurring at the sink quality of the sink habitat will affect sink populations resulting in founder effects [23]; delayed population growth [6];…”

Section: Selection Forces Consequencesmentioning

confidence: 99%

“…Because both the ultimate and proximate causes of dispersal vary based on a species' life history and ecology, dispersal strategy and dispersal ability can be variable between closely related groups of species [6,14]. Species may disperse at different life-history stages, leading to differences in initial population sizes, population growth rates and habitat occupancy.…”

Section: Introductionmentioning

confidence: 99%

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Role of sources and temporal sinks in a marine amphipod

Munguia

2015

Biol. Lett.

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Spatially structured habitats challenge populations to have positive growth rates and species often rely on dispersing propagules to occupy habitats outside their fundamental niche. Most marine species show two main life stages, a dispersing stage and a sedentary stage affecting distribution and abundance patterns. An experimental study on Corophium acherusicum, a colonial tube-building amphipod, showed the strong influence that a source population can have on new habitats. More importantly, this study shows the effect of temporal sinks where newly established populations can show reduced growth rates if the propagule supply from a source is removed. Sink populations had a reduction in abundance and became male-biased as females left colonies. The consequences arising from short-term dispersal and temporal sinks could be due to different selection pressures at the source and sink populations. These consequences can become reflected in long-term dynamics of marine populations if we shift focus to non-random dispersal models incorporating behaviour and stage-dependent dispersal.

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“…Much progress has been made determining causes of dispersal in vertebrates and marine invertebrate larval stages (adults of marine invertebrate species are typically sessile, resulting in obligate larval dispersal [10], [11]), but similar information on dispersal for invertebrate taxa that are mobile throughout their life history is scarce. While it is known that certain stages of various invertebrate species move more than others (juveniles in marine amphipods [12], [13], [14], adults and juveniles in freshwater stream invertebrates [15], juveniles and sex-biased adults in land-based arthropods [16], [17], [18]), hypotheses regarding the ultimate factors causing these biases have garnered less attention. Examples, however, do include Beirinckx et al [19], who observed female-biased dispersal in damselflies, and attributed this to maturation rate and foraging behavior in females.…”

Section: Introductionmentioning

confidence: 99%

Spatial Variation in Population Structure and Its Relation to Movement and the Potential for Dispersal in a Model Intertidal Invertebrate

et al. 2013

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Dispersal, the movement of an individual away from its natal or breeding ground, has been studied extensively in birds and mammals to understand the costs and benefits of movement behavior. Whether or not invertebrates disperse in response to such attributes as habitat quality or density of conspecifics remains uncertain, due in part to the difficulties in marking and recapturing invertebrates. In the upper Bay of Fundy, Canada, the intertidal amphipod Corophium volutator swims at night around the new or full moon. Furthermore, this species is regionally widespread across a large spatial scale with site-to-site variation in population structure. Such variation provides a backdrop against which biological determinants of dispersal can be investigated. We conducted a large-scale study at nine mudflats, and used swimmer density, sampled using stationary plankton nets, as a proxy for dispersing individuals. We also sampled mud residents using sediment cores over 3 sampling rounds (20–28 June, 10–17 July, 2–11 August 2010). Density of swimmers was most variable at the largest spatial scales, indicating important population-level variation. The smallest juveniles and large juveniles or small adults (particularly females) were consistently overrepresented as swimmers. Small juveniles swam at most times and locations, whereas swimming of young females decreased with increasing mud presence of young males, and swimming of large juveniles decreased with increasing mud presence of adults. Swimming in most stages increased with density of mud residents; however, proportionally less swimming occurred as total mud resident density increased. We suggest small juveniles move in search of C. volutator aggregations which possibly act as a proxy for better habitat. We also suggest large juveniles and small adults move if potential mates are limiting. Future studies can use sampling designs over large spatial scales with varying population structure to help understand the behavioral ecology of movement, and dispersal in invertebrate taxa.

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The influence of stage-dependent dispersal on the population dynamics of three amphipod species

Cited by 31 publications

References 28 publications

Sex change and morphological transitions in a marine ectoparasite

Sex change and morphological transitions in a marine ectoparasite

Role of sources and temporal sinks in a marine amphipod

Spatial Variation in Population Structure and Its Relation to Movement and the Potential for Dispersal in a Model Intertidal Invertebrate

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