Uhlorchestia

Bousfield, 1984

beach hoppers

Species Guides

Uhlorchestia uhleri(beach hopper)

Uhlorchestia is a of talitrid amphipods to salt marshes along the Atlantic coast of North America. The genus contains two described : U. spartinophila and U. uhleri. These amphipods are closely associated with smooth cordgrass (Spartina alterniflora) and function as in salt marsh . studies indicate high turnover rates and year-round with seasonal peaks.

Uhlorchestia uhleri by (c) Dr. Andrew G. Cannizzaro, some rights reserved (CC BY), uploaded by Dr. Andrew G. Cannizzaro. Used under a CC-BY license.

Pronunciation

How to pronounce Uhlorchestia: /ˌjuːlɔːrˈkɛstiə/

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Images

Habitat

Salt marsh intertidal zones, specifically levee (vegetated creekbank), high marsh, and low marsh . Closely associated with standing-dead leaves of smooth cordgrass Spartina alterniflora.

Distribution

Salt marshes along the Atlantic coast of North America; documented from Georgia, USA and distributed more broadly along the U.S. Atlantic coast.

Seasonality

densities highest March–May and lowest November–December. occurs year-round with peak output January–May.

Diet

and dead Spartina alterniflora leaves (both and blade portions), including decomposing cordgrass with associated fungal . Laboratory studies demonstrate survival and on these natural diets, with performance varying by leaf portion and decomposition state.

Life Cycle

Growth rates decrease with increasing body size and are lowest in winter. Minimum female size 5.4 mm total length. size ranges 1–28 or young, increasing with female body size; average 7.4 young for 7.6 mm TL female. Sex ratio typically favors females.

Behavior

Functions as a trophic link to decomposition processes in detrital-based salt marsh . Access to plant production made available by decomposers is influenced by structural characteristics and fungal occupation rates within different leaf portions.

Ecological Role

contributing to salt marsh decomposition processes. Prey resource for secondary consumers. High turnover rates (production: ratios 15.4–17.3) with broad intertidal distribution suggest greater contribution to trophic dynamics than standing stock biomass alone implies.

More Details

Population dynamics

production estimated at 0.769–1.444 g AFDW m⁻², with lowest values in low marsh and highest in levee .

Laboratory performance

Six-week laboratory rearing demonstrated 56–84% survival on most natural diets; yielded only 20% survival and no offspring. Starved amphipods survived no longer than 11 days.