Fincham, A.A., 1970b. Rhythmic behaviour of the intertidal amphipod Bathyporeia pelagica. Journal of the Marine Biological Association of the United Kingdom, 50, 1057-1068. Brafield, A.E., 1964. The oxygen content of interstitial water in sandy shores. Journal of Animal Ecology, 33, 97-116.

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EvidenceA decrease of two categories in the water flow rate for the duration of one year would, in the absence of wave action determining grain size, favour the deposition of finer sand, silts and clays. Bathyporeia pelagica demonstrated a habitat preference for clean, medium to fine grained sands with a minimum silt/clay content. Accumulation of finer sediments over the period of a year would alter not only the physical properties of the substratum, but also the chemical properties, especially the degree of oxygenation. Bathyporeia pelagica is probably intolerant of poorly oxygenated substrata, and smaller juveniles may be easily smothered by accretion of fine material. Again, assuming that tidal flow rate exerts an influence on sedimentation, Bathyporeia pelagica would become exposed to conditions outside its habitat preference and would probably no longer be found at such a location. Intolerance has been assessed to be high. Recovery has been assessed to be high owing to the species distribution and reproductive pattern (see additional information below), although following return to prior conditions, it may take many months for the substratum to obtain characteristics favourable for colonization by the species. STAND & DIG. This model works well for kids who just want to stand and dig and also works well when you pull up a wheel chair. Sensitivity is assessed against the available evidence for the effects of contaminants on the species (or closely related species at low confidence) or community of interest. For example:After feeding on the prey the larvae will pupate and eventually emerges from the nest as an adult wasp. This adult wasp will then look for a mate and if the wasp is a female, she will begin to prepare and provision a nest for its own eggs.

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EvidenceFor most metals, toxicity to crustaceans increases with decreased salinity and elevated temperature, consequently marine species living within their normal salinity range may be less susceptible to heavy metal pollution than those living in salinities near the lower limit of their salinity tolerance (McLusky et al., 1986). The weight limit of The Big Dig Sandbox Digger is 110 pounds. This means that our kids will be able to use this toy for years before they get too heavy for the seat. We expect that they will outgrow it based on their height and how comfortable they can be on the seat before reaching the weight limit. evidence of mass mortality of a population of the species or community of interest (either short or long term) in response to a contaminant will be ranked as high sensitivity; EvidenceAn increase of two categories in the water flow rate for the duration of one year would probably result in the winnowing away of the finest fraction of sand, leaving a coarser surface layer. Bathyporeia pilosa, a closely related species to Bathyporeia pelagica (Fish & Fish, 1996), avoided burrowing into substrata with particles > 500µm median diameter (Khayrallah & Jones, 1978a). Thus it is likely that Bathyporeia pelagica would become exposed to conditions outside its habitat preference and would probably no longer be found at such a location. Intolerance has been assessed to be high. Recovery has been assessed to be high owing to the species distribution and reproductive pattern (see additional information below), although following return to prior conditions, it may take many months for the deposition of a substratum suitable for colonization by the species e.g. Scott (1960) witnessed the deposition of a sandy beach to take 5 months following its near complete removal during storms. Khayrallah, N.H., 1977. Studies on the ecology of Bathyporeia pilosa in the Tay Estuary. , PhD thesis, University of Dundee.Fish, J.D. & Fish, S., 1996. A student's guide to the seashore. Cambridge: Cambridge University Press. Watkin, E.E., 1942. The macrofauna of the intertidal sand of Kames Bay, Millport, Buteshire. Transactions of the Royal Society Edinburgh, 60, 543-561. A short-term, acute change in temperature; e.g., a 5°C change in the temperature range for threeconsecutive days. This definition includes ‘short-term’ thermal discharges. A long-term, chronic change; e.g., a change of one category from the MNCR salinity scale for one year ( view glossary) such as from reduced to low. Further details. EvidenceDesiccation is unlikely to prove a lethal factor to a species of an established beach fauna since the risk of drying up follows a regular pattern to which the species have evolved e.g. the development of physiological adaptations to withstand the risk of desiccation (Eltringham, 1971). Bathyporeia pelagica is an intertidal species, whose distribution typically extends from above mean tide level (MTL), into the shallow sublittoral on beaches of clean medium to fine sand. Medium to fine-grained sand remains damp throughout the tidal cycle (Connor et al. 1997b) and its uppermost distribution on the shore is apparently primarily determined by its intolerance to reduced salinity (Preece, 1970). It is also a mobile species able to migrate from intolerable environmental fluctuations. If Bathyporeia pelagica were exposed to a change in desiccation equivalent to a change in position of one vertical zone on the shore, its environmental position and physiology are likely to protect it from the effects of desiccation and Bathyporeia pelagica has been assessed not to be intolerant of the benchmark change in desiccation.