Environmental biology of fishes, tập 91, số 2, 2011

Environ Biol Fish (2011) 91:133–144 DOI 10.1007/s10641-010-9765-z Habitat use, feeding and territorial behavior of a Brazilian endemic damselfish Stegastes rocasensis (Actinopterygii: Pomacentridae) Allan T Souza & Martina I Ilarri & Ierecê L Rosa Received: February 2010 / Accepted: 12 December 2010 / Published online: 25 January 2011 # Springer Science+Business Media B.V 2011 Abstract This paper presents the results of the first field study of the Brazilian endemic damselfish Stegastes rocasensis Underwater data were collected at the Fernando de Noronha Archipelago (NE Brazil), where four sites were visually assayed for local territorial and feeding behaviors, as well as habitat use S rocasensis preferentially fed on turf and macroalgae, and during the afternoon period Its territory size ranged from 0.26 to 13.86 m2 (1.61± 0.23 m2) Our findings suggest that adults preferably inhabit shallow, turf-rich areas, while sub-adults and juveniles occupy deeper areas with higher percent cover of invertebrates and hard corals, respectively With regards to agonistic behaviors, pursuit of intruders was the most frequent reaction recorded (p< 0.001); the highest level of aggression was elicited by territorial herbivores (p[...]... during this study were probably due to the penetration of the waters of the Brazilian current, explaining the differences found in the otoliths from those of Area A The Brazilian southeast area (Area C) presents a group of fish non-related to those of Area A, but with a certain degree of similarity to the M hubbsi of Area B This is a consequence of the reproductive process identified in this area, spawning... and seasonal movement patterns of hammerhead sharks at Malpelo Island? Are the populations of hammerhead sharks of Malpelo connected with those of the Galapagos Archipelago and Cocos Island? This study is part of a broader, regional initiative to understand the temporal and spatial relationship between the shark populations of the oceanic MPAs of the ETP Environ Biol Fish (2011) 91:165–176 Material and... Geographical variations of marine fish populations are common and constitute a tool for stock identification (Cadrin et al 2005) in fishery science The understanding of the degree of homogeneity of fish stocks is necessary for effective fisheries management, such as the prevention of overfishing, the preservation of their reproductive and genetic diversity and the achievement of optimal strategies for... 2004), tolerance of a wide range of environmental conditions (Kolar and Lodge 2002; Marchetti et al 2004), and longevity (Vila-Gispert et al 2005) Whether a successful invader possesses a distinct suite of characteristics may be of fundamental importance to the prediction and management of further invasions Hypoxia affects life history, distribution, behavior and biotic interactions of fish (Brönmark... Received: 23 November 2009 / Accepted: 3 February 2011 / Published online: 22 February 2011 # Springer Science+Business Media B.V 2011 Abstract Morphology and morphometry of the sagittae otolith were studied in young of the year Argentine hake, Merluccius hubbsi in the Southeastern Atlantic Geographical variation in the growth pattern of the young of the year Merluccius hubbsi was correlated with the... butterflyfish Anim Behav 63:165–173 Environ Biol Fish (2011) 91:145–153 DOI 10.1007/s10641-011-9767-5 Hypoxia tolerance of three native and three alien species of bitterling inhabiting Lake Kasumigaura, Japan Takahiro Morosawa Received: 29 September 2009 / Accepted: 3 February 2011 / Published online: 2 March 2011 # Springer Science+Business Media B.V 2011 Abstract Differences in hypoxia tolerance among... as well as the formation of a new ring The otolith development of M hubbsi throughout its area of distribution accompanies an increasing northward temperature gradient, resulting in bigger otoliths and greater variability of ring position from northern to southern area The canonical discriminate analysis showed that the otolith length and height explained most of the variation of the first discriminant... low dissolved oxygen have often been observed there Differences in hypoxia tolerance among bitterling species might have affected bitterling assemblage structure in Lake Kasumigaura, which is currently characterized by the dominance of R o ocellatus T Morosawa (*) Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-85 72, Japan e-mail: tiramos_arowahoka@yahoo.co.jp... influence of tropical warmer waters of the Brazilian Current At this point Brazilian Current is poorer in nutrients and food supply Feeding conditions reflect directly on otolith growth rate, lower in spring juveniles of M hubbsi In Southern Brazil (Area B), otoliths of the Argentine hake showed the greatest variability due to transitional features of the species related to the particularities of their... Fish Biol 69:233–242 Polunin NVC, Klumpp DW (1989) Ecological correlates of foraging periodicity in herbivorous reef-fishes of the Coral Sea J Exp Mar Biol Ecol 126:1–20 Environ Biol Fish (2011) 91:133–144 Randall JE (1967) Food habits of reef fishes of the West Indies Stud Trop Oceanogr 5:665–847 Robertson DR (1984) Cohabitation of competing territorial damselfishes on a Caribbean coral reef Ecology