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ECOLOGY PROGRESS SERIES Prog. Ser. Published August Nereis diversicolo ECOLOGY PROGRESS SERIES Prog. Ser. Published August Nereis diversicolo

ECOLOGY PROGRESS SERIES Prog. Ser. Published August Nereis diversicolo - PDF document

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ECOLOGY PROGRESS SERIES Prog. Ser. Published August Nereis diversicolo - PPT Presentation

Ecol Prog a profitable al 1985 this capture during grazing excur filters food water spends near one burrow Harley When disturbed at the surface 3 longbilled curlew however wader able their b ID: 402386

Ecol. Prog. profitable al.

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ECOLOGY PROGRESS SERIES Prog. Ser. Published August Nereis diversicolor: Ecol. Prog. a profitable al. 1985, this capture during grazing excur- filters food water spends near one burrow (Harley When disturbed at the surface, 3 long-billed curlew, however, wader able their burrows the year year article]). The fraction of worms accessible to a probing wader can be calculated if its bill length and the depths of the burrows are known (Fig. 12 preys on surface-feeding burrows provides a more paper deals curlews feeding even when variation is greatly male curlews cm); the individual variation distinguish 2 prey capture: the surface the entrance late summer. 85 plots pegged out, and 400 to 800 were staked was situated cm below mean sea level, which emersion period pm), determined the substrate, median grain nearby creek mud temperature at There were between July were marked individually with consequent extreme observations concern birds which not identified was estimated was small cm, thus and unpubl.). Individual curlews water period, 2 persons using a zoom-telescope (magnification were noted colour ring reference), (4) 4 types nearest second: handling swallows a always a part curlew probes a without finding without probing study was carried out from 1979 to 1982 method (cm Pace rate length (cm) as a prey being each graph based prey. Diagonals the sequence ignored them the same classes formed 10.8 cm. were larger relative size selection after a worms passing sieve; Table selection curves (Fig. low for taken as by definition a fragment, but more pieces whether the broken, the was estimated separately summed. There small worms we assume that the mean in fact the same equals the uneaten fragment as whether the taken as dry weights differ 13-fold Hence the size (Fig. a broken by converting weight in the same intact prey. usually give a being the the same is still it is account that a curlew without success cannot search be added decreases again Seasonal variation them remained in arrival in until their this time in July during the winter (Fig. intact worms, broken also broken intact worms, Esselink: Predation a polychaete worms per area during late summers. based upon known depth sandy substrate during summer Zwarts 1989) (B) Size frequency distnbution curlews in July (open). Graphs upon running Relative selectivity panels); prey 6 cm area) are depths exceed the length, and indeed disappeared during the the autumn 0 2 6 8 16 18 Fig. 10. Numenius arquata feeding on Nereis September during allometric relations relations � 99.9%, p 0.001, n = 1682 (1979), 1219 (1980) broken prey male curlews n varies Same data the autumn that the shortened in the autumn because the to winter. No significant on average its size the year Substrate temperature on the cm is intake rate 1.9 mg simple optimal diet equation there should be a other empirical et al. the case rather there with size. model is that predators know the energy value that predators estimate prey values mistakes (Rechten et al. 1983). the surface its size usually only a part the substrate. burrow. Although we are that there is a body width correlated (Esselink 1989). The Mya arenaria the surface instead others straight it will a curlew curlews select the expected step size selection prey size. small prey search rate the encounter rate but the prey overlooked may that the prey. This has been worked out a model has been with prey with a Nereis diversicolor prey which both as the posture is hand, the search rate by a per unit the search been quantified, and appears search technique, there curlews ignore concentrate on prey type the prey. mixed, the are taken suggests that feeding search rate by a in the within a tidal the year in Fig. curlews continuously a curlew the surface, surface within always a profitable On the Search rate relative occurrence curlews on (1989). Siphon by Professor Den Burg,