111年度的藻礁生態調查主要是針對桃園市三個主要藻礁海域的六個測站：觀新藻礁三個測站（永安、永興、保生）、大潭藻礁二個測站（G1、G2）及白玉藻礁一個測站，進行共四季的殼狀珊瑚藻的藻種組成及覆蓋率季節性變化的生態調查，並進行新竹縣的新豐藻礁的一次調查。四季調查結果顯示，各季的殼狀珊瑚藻的藻種數紀錄差異不大。整體而言，111年度桃園藻礁海域共計發現殼狀珊瑚藻21種藻種，六個測站中以觀新藻礁海域的保生測站最高（13種），而以大潭藻礁區的G1較低（8種）。各個測站的主要藻種組成是以藻種紀錄分布較廣的哈維石藻屬和孢石藻屬的藻種為主。在潮間帶上半部四季調查的殼狀珊瑚藻平均覆蓋率，以觀新藻礁海域的永興測站為最高（4月，41.4%±16.2%），以大潭藻礁海域的G1測站為最低（7月，3.1%±4.1%）。除了永興測站與白玉測站的最高平均覆蓋率出現在春季（4月），其他各測站的最高平均覆蓋率大都出現在冬季（1月）。另一方面，除了保生測站的最低平均覆蓋率出現在秋季（10月），其他測站的最低平均覆蓋率大都出現在夏季（7月）。其中有關大潭藻礁海域兩個測站（G1、G2）的殼狀珊瑚藻平均覆蓋率變化，在前二季（冬季及春季）調查，G1測站（1月：24.2%±19.4%；4月：15.3%±12.7%）皆高於G2測站（1月：19.0%±13.9%；4月：12.9%±12.9%），但在夏季（7月）與秋季（10月初），受到夏季高溫與愈來愈多的積沙影響，G1測站的殼狀珊瑚藻平均覆蓋率（7月，3.1%±4.1%；10月，6.3%±7.8%）下跌幅度較G2測站大（7月，4.2%±4.3%；10月，7.9%±6.3%）。在潮間帶下半部四季調查的殼狀珊瑚藻平均覆蓋率，以觀新藻礁海域的永興測站為最高（4月，44.3%±24.8%），以大潭藻礁海域的G1測站為最低（7月，6.7%±4.7%）。除了永興測站的最高平均覆蓋率出現在春季（4月）和白玉測站的最高平均覆蓋率出現在秋季（10月）之外，其他測站的最高平均覆蓋率大都出現在冬季（1月），而所有測站的最低平均覆蓋率都出現在夏季（7月）。其中，有關大潭藻礁海域以第一季至第三季（春季至秋季）調查時G1測站與G2測站的殼狀珊瑚藻平均覆蓋率差異不大，但在第四季調查時，各測站覆蓋率普遍回升的情況下，G1測站的殼狀珊瑚藻平均覆蓋率增加幅度（秋季，約增加1.2%）明顯低於G2測站（秋季，平均覆蓋率約增加7.1%）。
　　108年度至111年度在桃園藻礁海域殼狀珊瑚藻藻種組成方面，過去三年多期間共計發現殼狀珊瑚藻27種藻種，其中有5個測站皆發現有19種殼狀珊瑚藻（包括觀新藻礁海域的3個測站—永安、永興與保生；大潭藻礁海域的2個測站—G2與G1），而白玉測站也有15種。在桃園藻礁海域六個測站的藻種組成分析結果顯示有8種殼狀珊瑚藻為桃園藻礁海域常見藻種，依序為哈維石藻sp.1、孢石藻sp.1、玫瑰哈維石藻、膨石藻sp.3、張伯倫氏藻sp.2、波緣膨石藻、膨石藻sp.4與太平洋殼葉藻。有關近三年多來殼狀珊瑚藻的平均覆蓋率變化中，以4季皆有調查的年度相比，在潮間帶上半部與下半部的殼狀珊瑚藻年度平均覆蓋率皆以109年度（上半部，28.9%±19.7%；下半部，40.6%±25.4%）平均覆蓋率高於111年度（上半部，21.2%±18.5%；下半部，31.2%±24.1%）。
　　新竹縣新豐藻礁111年3月的調查顯示潮間帶上半部由岸邊的成片泥沙灘至中潮帶變化為逐漸有不連續礁體露出，在不同區塊的殼狀珊瑚藻覆蓋率變化極大（0%~51%），平均覆蓋率為6.9%±13.5%，且南側礁體的殼狀珊瑚藻覆蓋率為零。潮間帶下半部礁體也是受到泥沙與鵝卵石覆蓋，但露出較多藻礁體，不同點位的殼狀珊瑚藻覆蓋率變化雖然也大（1%~89%），但平均覆蓋率較潮間帶上半部高出許多（31.6%±27.4%）。與110年度5月份調查結果相比，在潮間帶上半部兩次調查平均覆蓋率差異不大，潮間帶下半部平均覆蓋率則是以111年3月（31.6%±27.4%）高於110年5月（5.8%±8.7%）。新豐藻礁在過去二年的調查發現的殼狀珊瑚藻共有4種（波緣膨石藻、膨石藻sp. 3、膨石藻sp. 4、張伯倫氏藻sp. 2），這些藻種也是在桃園藻礁海域常見的殼狀珊瑚藻種類。有關111年度精進藻礁科普教案更新部分：今年度教案內容包含更新桃園藻礁常見造礁珊瑚藻描述及分布以及增加桃園藻礁常見的其他無脊椎動物和常見的魚類介紹等內容。
  　　In the algal reef ecological survey of 2022, we continued to investigate the species composition and seasonal changes of crustose coralline algae (= CCA) in the three major algal reefs in Taoyuan City. The six investigation sites in the three algal reef areas are three in Guanxin (Yong'an, Yongxing, Baosheng), two in Datan (G1, G2) and one in Baiyu. The species composition between the first (Jan-Feb), second (Mar-Apr), third (July) and fourth (Sep-Oct) investigations were slightly different. In total, 21 CCA species were recorded from the six sites in the three major algal reefs. Among the 6 investigation sites, Baosheng station was shown to have the highest CCA species (13 spp.), whereas G1 station in Datan algal reefs was shown to have the least species (8 spp.). Among the recorded 21 CCA species, Harveylithon sp. 1 and Sporolithon sp. 1 were the widest distributed species in the investigation sites. In the upper parts of the investigated sites, the Yongxin station in Guanxin algal reefs was shown to have the highest CCA average coverage (Apr, 41.4%±16.2%), whereas the G1 station in Datan algal reefs was shown to have the lowest CCA average coverage (Jul, 3.1%±4.1%). Except the two stations (Yongxin and Baiyu, appearing in spring, Apirl), the highest CCA average coverage mostly appeared in the winter (Jan-Feb) in the other stations. On the other hand, the lowest CCA average coverage appeared in the summer (July), except the lowest CCA coverage appeared in the fall (Sep-Oct) at Baosheng station. In Datan algal reef area, the CCA average coverages in the first two seasons (winter-24.2%±19.4% and spring-15.3%±12.7%) in G1 station were higher than those in G2 station (winter-19.0%±13.9% and spring-12.9%±12.9%), whereas the CCA average coverages of the summer (3.1%±4.1%) and fall (6.3%±7.8%) in G1 station were lower than those in G2 (summer-4.2%±4.3%; fall-7.9%±6.3%). This situation might be due to the influence of heavily accumulated sand, which were distributed in the G1 algal reefs. In the lower parts of the investigated algal reefs, the Yongxin station in Guanxin algal reefs was shown to have the highest CCA average coverage (Apr, 44.3%±24.8%), whereas the G1 station in Datan algal reefs was shown to have the lowest CCA average coverage (Jul, 6.7%±4.7%). For most investigation stations, the highest CCA average coverage appeared in the winter (Jan-Feb); however, the highest average coverage in Yongxin and Baiyu stations appeared in spring (Apr) and in fall (Sep-Oct), respectively. Nevertheless, the lowest CCA average coverage for all the investigation sites all appeared in the summer (Jul). In Datan algal reef area, the CCA average coverages of the first three seasons (winter, spring, summer) showed no obvious differences between G1 and G2 stations (the differences more or less than 1%), whereas the average coverage in fall at G2 station (increased around 7.1%) is much higher than that recorded at G1 station (increased 1.2%).
　　During 2019-2022, 27 CCA species in total were recorded from the six investigation sites19 species appeared in five stations (YA, YX, BS, G2 & G1), whereas 15 species were recorded in BY station. Among the recorded CCA species, 8 species were shown to be commonly found in the six investigations sites of Taoyuan algal reefs including Harveylithon sp.1, Sporolithon sp.1, Harveylithon rosea, Phymatolithon sp.3, Chamberlainium sp.2, Phymatolithon margoundulatus, Phymatolithon sp.4 and Crustaphytum pacificum in sequence. As to the seasonal changes of coverages during 2019-2022, in the upper parts of the investigated algal reefs, the highest CCA yearly average coverage was recorded in 2020, the second appeared in 2019 and 2022, and the lowest occurred in 2021. In the lower parts of the investigated algal reefs, the highest CCA yearly average coverage appeared in 2019, the second appeared in 2020 and 2022, and the lowest occurred in 2021.
　　In March of 2022, we also investigated the species composition and coverages of CCA in Xingfeng algal reefs (Hsinchu county). In 2022, the upper parts of the algal reefs were heavily covered by sands and some patched algal reefs dispersed in the mid-tidal zone. As a result, the CCA mean coverage was relatively lower (6.9%±13.5%) than that observed in the lower tidal zone (31.6%±27.4%). On the other hand, in the lower parts of the algal reefs, although the reefs were also covered by a mixture of accumulated sands and pebble stones, the CCA coverages in different spots were very variable ranging from 1% to 89%. In 2021 and 2022, only four CCA species were found in Xingfeng algal reefs, including three species of Phymatolithon (P. margoundulatus, Phymatolithon sp. 3 & Phymatolithon sp. 4) and one species of Chamberlainium (Chamberlainium sp. 2). In the lower tidal zone, the CCA mean coverage in 2022  (31.6%±27.4%) is higher than that recorded in 2021 (5.8%±8.7%). About the guided science of algal reefs in 2022, we updated the description of common CCA species found in Taoyuan algal reefs as well as adding general introduction for some species of invertebrates (not described in 2021) and fishes frequently seen in the algal reefs.