California Sea Grant College Program最新文献

Nearshore fish assemblage patterns with respect to landscape-scale habitats in central Califonia 加利福尼亚中部景观尺度生境的近岸鱼类组合模式

California Sea Grant College Program Pub Date : 2011-08-01 DOI: 10.31979/etd.bspc-7zxa

Kristin Hunter-Thomson

{"title":"Nearshore fish assemblage patterns with respect to landscape-scale habitats in central Califonia","authors":"Kristin Hunter-Thomson","doi":"10.31979/etd.bspc-7zxa","DOIUrl":"https://doi.org/10.31979/etd.bspc-7zxa","url":null,"abstract":"In most ecosystems, the distribution of species across a landscape is greatly influenced by the type, amount, and spatial configuration of habitats. Studies in terrestrial environments have shown that species diversity, density, and length frequency often positively correlate with the size of a habitat patch, patch shape, and proximity to a patch edge. These patterns, however, have not been conclusively shown in temperate sub-tidal marine studies. Data from visual strip-transects collected from the Delta submersible were used to characterize fish assemblages with respect to rocky bank habitat patches. Specifically, the density, diversity, and length frequency of nearshore fishes were examined with respect to 1) proximity to the patch edge, 2) patch shape, and 3) patch size near Point Lobos and Point Sur, California. Diversity and length distributions of fishes were significantly greater at the edge than the interior of rocky bank patches. Therefore, landscape-scale patterns with respect to the distribution of nearshore fishes exist. However, this study also demonstrated that terrestrial paradigms are not directly applicable to temperate sub-tidal marine habitats. The relationship between species richness and patch shape was opposite of patterns observed in terrestrial systems. Additionally, patch size explained more of the variability in the nearshore fish assemblages than patch shape; however, neither were good predictive indicators of the density of fishes.","PeriodicalId":397885,"journal":{"name":"California Sea Grant College Program","volume":"337 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121244857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Diet of the Gopher Rockfish (Sebastes carnatus) Inside and Outside of Marine Protected Areas in Central California 加利福尼亚中部海洋保护区内外地鼠岩鱼(Sebastes carnatus)的饮食

California Sea Grant College Program Pub Date : 2011-08-01 DOI: 10.31979/etd.ds8c-qwga

Erin K. Loury

{"title":"Diet of the Gopher Rockfish (Sebastes carnatus) Inside and Outside of Marine Protected Areas in Central California","authors":"Erin K. Loury","doi":"10.31979/etd.ds8c-qwga","DOIUrl":"https://doi.org/10.31979/etd.ds8c-qwga","url":null,"abstract":"Marine protected areas (MPAs) can potentially impact food web dynamics by increasing the density of predatory fishes within their borders. Such increases in density can cause shifts in the prey use of generalist predators. This study investigated the effects of increased conspecific density on the diet of Gopher Rockfish (Sebastes carnatus) at a 35-year-old MPA at Point Lobos and four newly established central California MPAs at Ano Nuevo, Point Lobos, Piedras Blancas, and Point Buchon. Analysis of 710 stomachs collected in 2007-2009 indicated the most important overall prey were crabs, especially the family Pisidae and genus Cancer, as well as brittle stars and mysids. Diets did not differ inside versus outside the old Point Lobos MPA in terms of prey richness, evenness, composition, or Gopher Rockfish trophic level. Individual specialization, however, was greater outside the MPA. No consistent differences in these metrics were observed inside versus outside the four new MPAs, although prey evenness and composition did differ significantly among geographic locations. Diets at Ano Nuevo, the most northern and shallow collection location, were dominated by Cancer crabs and porcelain crabs, while diets from southern, deeper locations were dominated by brittle stars. The case study of the old Point Lobos MPA indicates that changes in fish feeding ecology in MPAs may take decades to occur, if at all. Differences in prey observed among geographic locations suggest variation in the community composition among central California’s new MPAs, which may influence the effect of each MPA on food web dynamics over time.","PeriodicalId":397885,"journal":{"name":"California Sea Grant College Program","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115561184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Effects of competition and dispersal on the recruitment of the annual kelp Nereocystis luetkeana 竞争和分散对一年生海带海带招募的影响

California Sea Grant College Program Pub Date : 2010-08-01 DOI: 10.31979/etd.4wps-e3hp

Matthew S. Suskiewicz

{"title":"Effects of competition and dispersal on the recruitment of the annual kelp Nereocystis luetkeana","authors":"Matthew S. Suskiewicz","doi":"10.31979/etd.4wps-e3hp","DOIUrl":"https://doi.org/10.31979/etd.4wps-e3hp","url":null,"abstract":"In central California, the role of algal assemblages on the recruitment of the canopy producing annual kelp Nereocystis luetkeana was examined by experimentally manipulating canopy and understory algae within 1) a Macrocysits bed and 2) a Nereocystis bed. Nereocystis reproductive material was introduced in some plots to examine the role of dispersal distance on recruitment. Nereocystis recruitment at both sites was significantly higher during spring compared to recruitment observed later in the study. Recruitment continued throughout the fall, however, suggesting a broad recruitment window. Recruitment success increased dramatically when understory algae were removed. Presence of a canopy (Nereocystis or Macrocystis) did not affect Nereocystis recruitment, suggesting that Nereocystis was not directly competitively inferior to Macrocystis. Greater recruitment was observed in areas seeded with Nereocystis propagules. Ultimately, recruitment of Nereocystis was controlled by understory algal assemblages and by the relatively short dispersal distance of its propagules. Additionally, the broad recruitment window for Nereocystis described here suggests that summer recruits can contribute to population resilience to late spring disturbances. This study indicates that given sufficient disturbance to the benthos and ample propagule supply, Nereocystis should be able to recruit and colonize new areas, regardless of the presence of Macrocystis.","PeriodicalId":397885,"journal":{"name":"California Sea Grant College Program","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133605342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Assessing Withering Syndrome Resistance in California Black Abalone: Implications for Conservation and Restoration 评估加州黑鲍鱼对枯萎综合症的抵抗力:对保护和恢复的影响

California Sea Grant College Program Pub Date : 2009-01-29 DOI: 10.21236/ada514157

H. Lenihan

引用次数: 0

Biology of the Red Abalone, Haliotis rufescens, in Northern California 北加利福尼亚红鲍鱼的生物学

California Sea Grant College Program Pub Date : 2005-12-01 DOI: 10.31979/etd.acv5-87gh

R. Leaf

引用次数: 3

Long-Term Changes in Biological Characteristics and Fishery of Loligo opalescens 乳白螺生物学特性和渔业的长期变化

California Sea Grant College Program Pub Date : 1900-01-01 DOI: 10.31979/etd.r67q-fyv5

Briana C. Brady

引用次数: 4