Nursery provision of red-algal habitats in temperate Algoa Bay, South Africa

IF 2.1 3区 生物学 Q2 MARINE & FRESHWATER BIOLOGY Marine Biology Pub Date : 2024-08-29 DOI:10.1007/s00227-024-04506-2
N. C. James, A. G. Jacobs, M. Gayiza, L. R.D. Human, P. P. Steyn, A. T. Bernard, G. M. Rishworth
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Abstract

This study examines the importance of both macroalgal heterogeneity and specific macroalgal species or morphotypes to nursery provision for juvenile sparids (Diplodus capensis and Sarpa salpa) in a shallow (< 2 m), sheltered rocky cove in warm-temperate Algoa Bay, South Africa. The rocky cove is comprised of a mosaic of two main benthic habitats; canopy-forming Plocamium corallorhiza beds on rocky outcrops and flat reef dominated by low growing red algae morphotypes. We assessed macroalgal communities and the trophic ecology (stomach contents and isotopes), abundance and size structure of D. capensis and S. salpa in the two different benthic habitats and the resources/food associated with the dominant macroalgae species/morphotypes. We found high densities of S. salpa and D. capensis, in both high profile reef (rocky outcrops) and low profile (flat) reef. Within this habitat mosaic resources (epiphytes and macroinvertebrates) were more abundant in the non-canopy forming low growing macroalgae (Laurencia spp. and coralline turf algae) and these algae were also assimilated in the diets of both sparids. The high abundance of both juvenile S. salpa and D. capensis in high profile and low profile reef, suggests that within this mosaic of habitats these species may be using canopy-forming algae in the high profile reef for shelter and non-canopy forming algae in both the high and low profile reef for food. This shows that macroalgal habitats comprising several morphotypes have the potential to support higher juvenile diversity and abundance through both food provision and shelter.

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南非温带阿尔戈阿湾红藻栖息地的苗圃供应
本研究探讨了大型藻类异质性和特定大型藻类物种或形态对南非阿尔戈阿湾暖温带浅海(2 米)避风岩湾中幼鱼(Diplodus capensis 和 Sarpa salpa)育苗的重要性。岩石海湾由两种主要底栖栖息地拼接而成:岩石露头上的冠层形成藻床(Plocamium corallorhiza)和以低生长红藻形态为主的平礁。我们评估了两种不同底栖生境中的大型藻类群落和营养生态学(胃内容物和同位素)、D. capensis 和 S. salpa 的丰度和大小结构,以及与主要大型藻类物种/形态相关的资源/食物。我们发现,在高剖面珊瑚礁(岩石露头)和低剖面珊瑚礁(平地)中,S. salpa 和 D. capensis 的密度都很高。在这种栖息地镶嵌资源(附生植物和大型无脊椎动物)中,非冠层形成的低生长大型藻类(月桂藻属和珊瑚礁草皮藻)更为丰富,这些藻类也被这两种鱼类同化。在高剖面和低剖面礁石中都有大量的幼鱼,这表明这些物种可能利用高剖面礁石中形成冠层的藻类作为栖息地,并利用高剖面和低剖面礁石中形成非冠层的藻类作为食物。这表明,由多种形态组成的大型藻类栖息地有可能通过提供食物和庇护来支持更高的幼体多样性和丰度。
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来源期刊
Marine Biology
Marine Biology 生物-海洋与淡水生物学
CiteScore
4.20
自引率
8.30%
发文量
133
审稿时长
3-6 weeks
期刊介绍: Marine Biology publishes original and internationally significant contributions from all fields of marine biology. Special emphasis is given to articles which promote the understanding of life in the sea, organism-environment interactions, interactions between organisms, and the functioning of the marine biosphere.
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