to study the population structure of decapods in the intertidal zone of bushehr rocky shores, some random sample collection from four rocky and rubble shores of bushehr were done using a 50×50 quadrates sampling unit, in four successive seasons from autumn 2009 to summer 2010. totally 8 speciesbelonging to 5 family of decapods were identified and counted. in the whole course of sample collectio...

The ascidian fauna from the Southwestern Atlantic (Argentine Sea) have scarcely been studied and have rarely been sampled. The existing scanty ascidian records are from specimens collected by dredging many decades ago. During samplings in the San Matias Gulf (Río Negro, Patagonia), two new Distaplia species were found. Distaplia naufragii sp. nov. was collected in the subtidal zone attached to ...

Genetic variability at the phosphoglucose isomerase (PGI) locus was compared in Mediterranean sympatric populations of Patella aspera, P. coerulea and P. lusitan~ca. P. aspera and P. coerulea show PG1 patterns much alike, while P. lusitanica exhibits a more anodal general zone of mobility of its PG1 allozymes. The differentiation of P. lusitanica pattern may be tentatively interpreted as the re...

BACKGROUND The family Epitoniidae is a group of small to medium-sized gastropods and occurs globally from the intertidal zone to abyssal seabeds. There are 101 epitoniid species currently recorded from Taiwan. NEW INFORMATION Based on our investigations of seashores and fishing ports of Taiwan, a new species and 12 new records of Epitoniidae species are reported. Of the 12 new records, four a...

Models of population dynamics, under various distributions of environmentally-inflicted loss processes, suggest that population persistence depends on the level of synchronization of the environmental and population processes. Population growth is maximized when disturbance periodicity is an integer or fractional multiple of the population characteristic periodicity. This Resonance Phenomenon i...

Conchyliurus dispar, a new species associated with the bivalve Barnea manilensis (Philippi), is described from the intertidal zone of the Yellow Sea. The new species is distinguished from its congeners by a combination of the following characters: the absence of posterolateral processes on the male genital somite, the absence of a dorsal lobe on the female genital double-somite, and the presenc...

Atarbolana makranensis sp. n. is described from the intertidal zone of Makran along the Iranian coast of the Gulf of Oman. Atarbolana makranensis sp. n. can be recognized by the presence of a tuft of long setae on the antennal flagellum of males, elongate pleotelson with 12 robust marginal setae, pleotelson with narrowly rounded apex extending well beyond the uropodal endopod, uropodal endopod ...

In a ¢eld experiment, the accumulation of trematode (Echinostomatidae) metacercariae by the New Zealand cockle Austrovenus stutchburyi was compared among treatments with di¡erent seabed hydrodynamics and sedimentation rates. There was no signi¢cant di¡erence among the treatments in the rate at which cockles accumulated metacercariae, suggesting that infection rates are not in£uenced by water £o...

Background: Finding of a single female specimen of the African mangrove crab Perisesarma alberti Rathbun, Bull Am Mus Nat Hist 43: 379–474, 1921, in the intertidal zone of the eastern part of the Bay of Seine, English Channel, France. Result: Identification and description of the recorded crab, photographs and measurements of the single specimen. Comparison with reports from West African mangro...

A new species Nipponemertes incainca is described from the intertidal zone of Santa Marta, Colombia. A new recent approach based on both morphological and molecular characters is applied for the description. The main characteristics of the species are: red color, head shield-shaped with a mid-dorsal cephalic ridge, furrows pre-cerebral inconspicuous with few faint ridges orthogonal to furrow ax...