. Bulletin. Science; Natural history; Natural history. 184 BULLETIN SOUTHERN CALIFORNIA ACADEMY OF SCIENCES VOLUME 75. ATTACK TENDENCY Figure 1. The agonistic action patterns of Hypso- blennius spp. arranged as to functional motivational context. See text for explanation. Table 1. The species of Hypsobletmius studied with notes on zoogeography and ecology. Habitat sym- patry is indicated by connecting vertical bars. H. jenkinsi (Jordan and Everman)—California and northern Baja California. Found in barnacle tests and bore holes on shallow, subtidal reefs with dis- ruptive background. _H. gentiU
. Bulletin. Science; Natural history; Natural history. 184 BULLETIN SOUTHERN CALIFORNIA ACADEMY OF SCIENCES VOLUME 75. ATTACK TENDENCY Figure 1. The agonistic action patterns of Hypso- blennius spp. arranged as to functional motivational context. See text for explanation. Table 1. The species of Hypsobletmius studied with notes on zoogeography and ecology. Habitat sym- patry is indicated by connecting vertical bars. H. jenkinsi (Jordan and Everman)—California and northern Baja California. Found in barnacle tests and bore holes on shallow, subtidal reefs with dis- ruptive background. _H. gentiUs (Girard)—California and north-central Baja California. Found in a variety of habitats from grass beds to sea walls and buoys from barely subtidal depths to at least 30 m at the southern extent of its range. It has limited habitat overlap with H. jenkinsi. H. brevipinnis (Gunther)—Southern Baja Califor- nia to Central America and northern Peru. It inhabits barnacle tests on shallow, wave-washed rocks in barren habitats. H. robustus (Hildebrand)—Central Peru. Habitat identical to H. jenkinsi. H. sordidus (Bennet)—Central Peru to central Chile. It inhabits the same areas as H. robustus as well as the habitat type of H. brevipinnis. of substrata: gravel bottom with cobble and broken shells, opaque plastic tubes, and Balanus barnacle tests resting on the bottom and mounted on vertical, artificial rock surfaces. Fish were fed an overabundance of cut frozen shrimp and living invertebrates such as brine shrimp, Enieriia sand crabs and assorted benthic amphipods in order to encourage normal foraging behavior. Fish were held under reversed photoperiod and observed from a darkened chamber through slits in a blind. Tape recorded notes were made of essentially all of the activities of groups of fish during two to five-hour observation periods. Two methods were used in order to approximate the motivational state of an individual as evidenced by its agonistic and sexual behavior.
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