Scartella cristata - Amazon S3

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64 changes in the composition of the fouling community (Topolski and Szedlmayer 2000). The structure of blenny assemblages also may indicate the development an artificial habitat functionally equivalent to a natural one (Topolski and Szedlmayer 2000). Blennies also may serve as important indicators of environmental quality due to their habit of establishing populations in close proximity to human impacts on the marine environment. Viviparous blennies, Zoarces viviparous, have been found to be useful indicators of petroleum contamination from oil platforms (Celander et al. 1994) and industrial chemical effluents (Vetemaa et al. 1997) in the North Sea. Blennies may be useful environmental indicators of jetty habitats on the Texas coast as well as oil platforms. Over 13,000 commercial vessels and an even larger number of smaller recreational and fishing boats annually pass through channels protected by jetties at the three sites utilized in the study (Port of Houston Authority 2001, Port of Corpus Christi Authority 2001). More than 1,000 of these commercial vessels were tankers carrying 75.5 million tons of petroleum and 1.94 million tons of assorted chemicals through Aransas Pass alone (Port of Corpus Christi Authority 2001). Blennies on jetties may be useful as models to study the chronic effects of long-term sub-lethal exposures to petroleum and other chemicals. The data presented in this study should serve as the foundation for continued examination of the utility of blennies to fisheries biologists and resource managers. Conclusions The major findings of the present study are as follows: • Four species of blenniids and one labrisomid species reside on Texas jetties. These species formed geographically distinct assemblages at the three study sites but further work is needed to determine if these sites are representative of the Texas coast. • The blenny assemblages at each site appeared to be relatively stable in species composition over time. Observed fluctuations in CPUE were driven primarily by temperature and may be an artifact of sampling bias. • Scartella cristata is the dominant blenny on Texas jetties. It is a short-lived species that spawns throughout most of the year. Further research questions should focus
65 on why this species is so abundant on Texas jetties by addressing information voids on growth rates of other blenny species; physiological tolerances and requirements; and interactions between S. cristata and other constituent species. • Texas jetties represent a convergence of at least two genetically distinct populations of Scartella cristata. The local population of S. cristata at Galveston had close ties with Florida indicating its origins lie in the eastern Gulf. Port Aransas and South Padre Island do not share this affinity with Florida. These local populations were closely related to each other suggesting a source population in the southern Gulf or Caribbean. Future work should include samples from a wider geographical range and incorporate investigations into cohort effects on the genetic structure of local populations.
Page 1 and 2:
TEMPORAL AND SPATIAL VARIABILITY OF
Page 3 and 4:
3 ABSTRACT Temporal and Spatial Var
Page 5 and 6:
5 ACKNOWLEDGMENTS No journey of dis
Page 7 and 8:
7 and Moore (1998) indicate that Hy
Page 9 and 10:
9 and larvae of organisms that must
Page 11 and 12:
11 METHODS Study Areas Blenny assem
Page 13 and 14: 13 29° 18.8’ 29° 16.2’ Galves
Page 15 and 16: 15 each worked a different 15-m tra
Page 17 and 18: 17 for the same time period by the
Page 19 and 20: 19 μL of Proteinase K (10mg/ml) an
Page 21 and 22: 21 where n is the total number of b
Page 23 and 24: 23 RESULTS Habitat Characterization
Page 25 and 26: 25 the Galveston beachfront were la
Page 27 and 28: 27 Species Composition A total of 4
Page 29 and 30: 29 and declined quickly by mid wint
Page 31 and 32: 31 60 n=195 50 TL (mm) 40 30 n=1867
Page 33 and 34: 33 Hypsoblennius hentz and Hypsoble
Page 35 and 36: 35 0.8 0.7 H’ J’ H’ and J’
Page 37 and 38: 37 Mean age of individuals from the
Page 39 and 40: 39 2.5 2.0 1999 n=52 1.5 1.0 0.5 %
Page 41 and 42: 41 100 80 SLOPE INT ERCE PT R 2 Gal
Page 43 and 44: 43 elated haplotypes (B, D, E) acco
Page 45 and 46: 45 A H I H F D D C F Florida n=9 B
Page 47 and 48: 47 45 Florida n=9 45 Port Aransas n
Page 49 and 50: 49 during early life stages of thes
Page 51 and 52: 51 on these jetties exhibited a fai
Page 53 and 54: 53 Hypsoblennius ionthas=2.82 mm (C
Page 55 and 56: 55 Scartella cristata is a wide-ran
Page 57 and 58: 57 source for Port Aransas and Sout
Page 59 and 60: 59 The subpopulations Scartella cri
Page 61 and 62: 61 more robust population. The catc
Page 63: 63 The last comprehensive survey in
Page 67 and 68: 67 Crabtree RE, Middaugh DP (1982)
Page 69 and 70: 69 Hubbs CL (1939) The characters a
Page 71 and 72: 71 Santos RS, Nash RDM (1996) Seaso
Page 73 and 74: APPENDIX A 73
Page 75 and 76: 75 100 100 75 NOVEMBER 2000 n=7 75
Page 77 and 78: 77 100 100 75 NOVEMBER 2000 n=3 75
Page 79 and 80: 79 100 100 75 MAY 2000 n=23 75 AUGU
Page 81 and 82: 81 100 JUNE 2001 n=525 100 AUGUST 2
Page 83 and 84: 83 100 100 75 FEBRUARY 2001 n=7 75
Page 85 and 86: 85 100 75 JULY 2000 n=81 100 75 OCT
Page 87 and 88: 87 100 100 75 MARCH 2001 n=1 75 JUN
Page 89 and 90: 89 100 100 75 JUNE 2001 n=7 75 AUGU
Page 91 and 92: 91 APPENDIX B. Sequences for each h
Page 93 and 94: 93 HAPLOTYPE K CTGAC_TTGAAAAGTTGGGA
Page 95 and 96: 95 HAPLOTYPE V CTGCC_TTTAAAAGTT_GGA
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Scartella cristata - Amazon S3

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