Influence of intra- and interspecific competition on periphyton biomass and growth performance of Holothuria scabra juveniles

IF 1.5 4区地球科学 Q3 MARINE & FRESHWATER BIOLOGY

Bulletin of Marine Science Pub Date : 2021-01-01 DOI:10.5343/bms.2020.0048

Jay R Gorospe, M. A. Juinio-Meñez, P. Southgate

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引用次数: 1

Abstract

The effects of sea cucumber (Holothuria scabra) juvenile density and interspecific competition from the opisthobranch Stylocheilus striatus (SS) on periphyton biomass and growth performance of H. scabra (HS) were assessed. The number of H. scabra juveniles (15, 50, 100) in net enclosures (treatments HS15, HS50, and HS100) was varied and feeding activity of S. striatus was assessed at a density of 15 individuals per net enclosure (treatment SS15), and in co-culture with H. scabra (treatment HS15/SS15). A control treatment without H. scabra or S. striatus was included in the 28-d experiment. Highest and lowest growth rates of H. scabra occurred in the lowest (HS15) and highest (HS100) stocking density treatments, respectively, on days 14 and 28. Growth of H. scabra juveniles in the HS15 treatment was more than double that of those in the HS15/SS15 treatment. Juvenile survival was significantly higher in the HS15 treatment on days 14 and 28, but did not differ significantly from that of juveniles in the HS15/SS15 and HS50 treatments on day 14. Grazing activity of sea cucumber juveniles and S. striatus resulted in a decline in periphyton biomass (AFDW) after day 7. Differences in food consumption (based on faecal production) among treatments were significant only on days 1 and 21 with the greatest consumption (17.5 mg periphyton ind−1 d−1) by S. striatus in the SS15 treatment. Holothuria scabra juveniles in the HS15 treatment consumed 4.9 mg ind−1 d−1, while those in the HS100 treatment consumed only 1.8 mg ind−1 d−1 after 24 hrs.

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种内和种间竞争对黄颡鱼幼鱼周围生物量和生长性能的影响

研究了海参(Holothuria scabra)幼鱼密度和海参科Stylocheilus striatus (SS)种间竞争对糙海参(H. scabra, HS)外周生物量和生长性能的影响。不同网箱(HS15、HS50和HS100处理)中褐条黄颡鱼幼鱼数量(15、50、100)不同，以15尾/网箱(SS15处理)和与褐条黄颡鱼共培养(HS15/SS15处理)的方式评价纹状条黄颡鱼的取食活性。在28 d的试验中，采用不含糙皮霉和纹状霉的对照处理。最低放养密度处理(HS15)和最高放养密度处理(HS100)在第14天和第28天的生长速率最高和最低。在HS15处理下，黄痂疮幼虫的生长速度是HS15/SS15处理的两倍以上。在第14天和第28天，HS15处理的幼鱼存活率显著高于HS15/SS15和HS50处理的幼鱼存活率，但在第14天与HS15/SS15和HS50处理的幼鱼存活率无显著差异。在第7天，海参幼鱼和纹状体的放牧活动导致其周围植物生物量(AFDW)下降。不同处理间的食用量差异(基于粪便产量)仅在第1天和第21天显著，其中SS15处理的纹状体食用量最大(17.5 mg周菌和- 1 d - 1)。24小时后，HS15处理的糙斑全息图幼虫消耗4.9 mg / d−1，而HS100处理的幼虫消耗1.8 mg / d−1。

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来源期刊

Bulletin of Marine Science 地学-海洋学

CiteScore

2.90

自引率

6.70%

发文量

审稿时长

6-12 weeks

期刊介绍： The Bulletin of Marine Science is a hybrid open access journal dedicated to the dissemination of research dealing with the waters of the world’s oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine policy, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, meteorology, and physical oceanography. In most regular issues the Bulletin features separate sections on new taxa, coral reefs, and novel research gear, instrument, device, or system with potential to advance marine research (“Research Tools in Marine Science”). Additionally, the Bulletin publishes informative stand-alone artwork with accompany text in its section "Portraits of Marine Science."