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Distribution and Behaviour of the Amphipod, Talorchestia Capensis (Crustacea; Talitridae)

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Distribution and Behaviour of the Amphipod, Talorchestia Capensis (Crustacea; Talitridae) Distribution and behaviour of the amphipod, Talorchestia capensis (Crustacea; Talitridae) P. van Senus and A. Mclachlan Department of Zoology, University of Port Elizabeth, Port Elizabeth Distribution of the amphipod, Talorchestia capensis Talitrid amphipods are characteristic of the supralittoral of (Crustacea; Talitridae) has been studied in a dune-beach most temperate coasts (Dahl 1952). Their distribution ~d system. The majority of amphipods occurred in dune slacks abundance is related to favourable microclimatic conditions, with fewer on the beach. No zonation of size classes such as a low rate of evaporation and the presence of organic existed, both juveniles and adults occurring throughout the slack. Amphipods were concentrated in the top soil layers, wrack, which serves both as a food source and protection where temperature fluctuations were highest and per cent against dehydration (Chelazzi & Ferrara 1978). Nocturnal moisture lowest. However, gravid females preferred slightly behaviour has been observed in many taIitrid species (Enright deeper soil layers. Studies during a spring and a neap tide 1963; Bregazzi & Naylor 1972; Benson & Lewis 1975; Muir indicated that the animals have a Circadian rhythm with a 1977), suggesting they have an endogenous circadian rhythm_ nocturnal activity phase, and a weak tidal rhythm, but no Moving around during the night the animal must have an lunar orientation mechanism. orientating mechanism to move back to suitable areas before S. Afr. J. Zool. 1985, 20: 253 - 257 sunrise. Williamson (1951) suggested animals utilize visual Verspreiding van die amfipode, Talorchestia capensis stimuli from silhouettes or sand dunes, while Papi (1960) (Crustacea; Talitridae) is bestudeer in 'n kussandduin-eko­ suggested a lunar orientation mechanism. sisteem, en toon dat meeste van die amfipode in die duin­ This paper reports on a taIitrid population inhabiting a large ) 0 trog en slegs 'n klein persentasie op die strand voorkom. coastal dunefield. The vegetation cover of the dune system 1 Volwassenes en onvolwassenes kom nie in verskillende 0 2 is restricted to damp hollows or slacks and Talorchestia sones voor nie, en is versprei deur die hele duintrog. d Meeste van die amfipode kom in die bogrondlae voor, waar capensis is associated with vegetation hummocks in these e t temperatuurfluktuasies die hoogste en voggehalte die slacks_ The aims of the present study were to investigate a d laagste is, maar eierdraende wyfies verkies die dieper ( horizontal and vertical distribution, association with vegetation r grondlae. Migrasiestudies gedurende 'n spring- en dooiegety e hummocks and migratory and activity patterns in T. capensis. h toon dat die spesies 'n daaglikse ritme, met 'n nagtelike s i l aktiwiteitsfase het asook 'n swak getyritme, maar geen Study area b ori~nteringsmeganisme relatief tot die maan nie. u The study area was the Alexandria coastal dunefield in Algoa P S.-Afr. Tydskr. Dierk. 1985, 20: 253 - 257 e Bay, which lies between the Sundays River mouth and Cape h t Padrone. Several habitat types have been described in the y b dunefield, of which slacks make up 0,1070 of the total area d & e (Mclachlan, Ascaray Du Toit 1985). Slacks can be defmed t n as low-lying ground between dunes, where the ground water a r is close to the surface (Tansley 1949) and contain vegetation g e hummocks formed by various plant species. They commence c n 50 m landward from the normal driftline and are separated e c from the beach by a ridge of sand and pebbles about 2 m i l r above mean sea leveL From this ridge a corridor leads into e d each slack, the slack lying between transverse dune ridges n u which average 5 - 7 m in height. y a Materials and Methods w e t Spatial and temporal distribution a G The temporal and horizontal distribution of T. capensis was t e determined by sampling a grid (Figure 1) every four weeks n i between February and December 1983. Pit traps, consisting b a of 5...f buckets with ethylene glycol in the bottom, were used. S P. van SemIS BDd A. McLachlan* y Department of Zoology, University of Port Elizabeth, P.O. Box Twenty such traps were placed in two separate slacks, and b 1600, Port Elizabeth, 6000 Republic of South Africa the animals caught were counted and divided into size classes. d e c To determine vertical distribution a 10 em internal diameter ·To whom correspondence should be addressed u corer was forced more than 25 em into selected vegetation d o r Received 12 November 1984; accepted 14 May 1985 hummocks_ Cores were divided into 5 em vertical sections, p e R 254 S.-Afr. Tydskr. Dierk. 1985, 20(4) which were placed in I-mm mesh bags. Temperature and Hummock preferences moisture were recorded from sand in the walls of the holes During each of the four seasons of 1983: autwnn, winter, with a mercury thermometer and Speedy Moisture Tester spring and summer, each vegetation hummock within one (Thomas Ashworth, England) respectively. The bags were slack, was checked for amphipods by looking for burrow washed and the animals in each depth layer counted, measured holes or by turning over the sand. After all the hummocks and sexed. This was done every hour for 12 h. had been checked, 40 random samples were taken in those hummocks containing amphipods. A corer with a 10 em SEA internal diameter and a length of 30 em was used. The sand HWS was wet sieved and the animals counted. 2 BERM Migratory patterns aO-100m " 3 ] To monitor migratory patterns, two 12-h surveys were r ............. COBBLE RIDGE conducted, one over a nocturnal spring-tide (full moon), and 5 the other during a nocturnal neap-tide (first quarter) cycle. e Eight traps consisting of 5...( buckets, sunk level with the sand "~'OOm 1 7 l~CK were set up in a rough grid (Figure 1). A cross-shaped device a was fitted inside each bucket subdividing it into four equal BACK DUNES (east, west, north and south) sections. These traps were based on the directional traps used by Chelazzi & Ferrara (1978). 'LAND A small volume of sea water was placed in the buckets to N prevent sandhoppers from jumping out. The traps were Figure 1 Diagram of trap grid. checked every 2 h for 12 h and the tidal level and moon 18.7.83 3.2.83 21.8.83 1.3.83 . ) 0 1 0 2 d e t a d ( r 29.3.83 e h s i l b u P e h 26.4.83 t y b d e t n a r g 24.5.83 e c n e c i l r e d n 22.6.83 u y a w _ JUVENIL S e t ADULT _ a G t e [ 100 n i b a S y b 100m 150-200m 100m 150-200m d e c u d Figure 1 Kite diagrams to show the horizontal and temporal distribution patterns for T. capensis at Sundays River beach during 1983, where o r A = high-water mark; B = boundary of cobbles and slack; C = front of slack; D = middle of slack and E = end of slack. p e R 255 position recorded. Animals were counted each time and left when temperature in the top soil layers dropped, the propor­ inside the traps. tion of amphipods in this layer increased. Contrary to expec­ tation, most amphipods occurred near the surface of the soil, Results although this is where the moisture content was always lowest Spatial and temporal distribution and temperature highest. Moisture contents ranged 0-12070 From Figure 2 it can be seen that the majority of animals and temperature 23 - 33°C during the day with surface layers occurred in the slack itself (Stations B - E), and very few on always drier and hotter. This suggests that moisture and the beach (Station A). During early summer (October - temperature do not play a major role in the vertical distri­ November), however, a large amount of driftwood was bution in the sediment. Juveniles showed a significant prefe­ deposited on the beach, and large numbers of T. copensis were rence for the top soil layers ('l test; p < 0,01), while gravid associated with this. No zonation of size classes existed. females showed a significant preference for soil layers deeper The majority of T. capensis occurred in the top 5 cm of than 15 em depth ("l test; p < 0,01). soil (Figure 3) and none were found below 20 em. At dawn, Hummock preferences Throughout the year Gazania rigens hummocks, which are the commonest hummocks in the slack, housed most animals ~:::3 MALES (Figure 4) while Arctothecea populi/olia hummocks and • FEMALES NO EGGS driftwood also contained large populations . .. FEMALES WITH EGGS Migratory patterns Migration diagrams for spring and neap-tides are presented JUVENILES ~ in Figures 5 and 6. During both periods few animals were CI) ...J caught in pit traps 1 - 4 on the beach, the majority being « ~ caught in the slack. Immediately after sunset some animals z started to emerge from the sand, although most sandhoppers « appeared later. These animals moved randomly about till u.. 0 sunrise, when they burrowed vertically in vegetation hum­ 0: w 15 mocks. ED During the spring-tide sampling period the moon was visible ~ :::J the whole night, while during the neap-tide sample the moon Z 10 appeared about midnight. No distinct orientation pattern was . found in relation to the moon. Animals were active through­ ) 0 out the night, but most especially around the high-tide period 1 0 5 on both occasions. 2 d e Discussion t a d Spatial and temporal distribution ( 5 10 o 15 20 r Craig (1973) found that there was a size gradation in the e DEPTH(cm) h distribution pattern of Orchestoidea comiculata, the larger s i l T.
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