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Holbrook Pond, Hebron

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2004 Aquatic Plant Survey Map of Holbrook Pond

(1.5 MB, .pdf format*)

Transect Data (243 KB, .pdf format*) | Water Data

Aquatic plants grow densely throughout Holbrook Pond, an 83.3-acre water body in Salmon River State Forest. The pond supports a very diverse community of aquatic plants. A total of 23 species were found during a 2004 survey, including three invasive species. The most abundant species recorded during the survey were Nymphaea odorata and the invasive Cabomba caroliniana.  Other abundant species included Nuphar variegata, primarily along the shore, and Brasenia schreberi, which extended into the middle of the shallow lake, which has a maximum depth of 7.5 feet and a mean depth of 4.9 feet.

The western shore of the pond was choked with vegetation.  Nuphar variegata and Nymphaea odorata were the most abundant species, extending from the shore into water as much as 5 feet deep.  Brasenia schreberi, Utricularia vulgaris, U. purpurea and U. gibba also were recorded.  Cabomba caroliniana grew under the floating-leaved species through much of the area, along with individual plants and small patches of Potamogeton pulcher, P. natans, Ceratophyllum demersum, Elodea canadensis and an invasive hybrid of Myriophyllum heterophyllum and a Southern species, M. laxum.

           

The two northern coves of the pond also supported dense vegetation.  Both were dominated by Brasenia schreberi and Nymphaea odorata. Submerged species, including Cabomba caroliniana, the Myriophyllum hybrid and Potamogeton natans, were recorded only in the southern end of the northwestern cove. Cabomba caroliniana was found under the floating-leaved species in the northeastern cove. The two coves supported several bladderwort species.

           

Nymphaea odorata, Brasenia schreberi and Cabomba caroliniana were the most abundant species on the eastern side of Holbrook Pond. Occurring with these species were individual plants or small patches of Myriophyllum, Potamogeton natans, P. pulcher, P. robbinsii, P. epihydrus, Elodea canadensis and Vallisneria americana.  Four bladderworts – Utricularia vulgaris, U. radiata, U. purpurea and U. gibba – were recorded on the eastern side as well.

A dam and state boat ramp are located on the southern end of the lake, where Cabomba caroliniana was abundant, growing with Nymphaea odorata, Brasenia schreberi and Nuphar variegata.  Small patches or individual plants of Potamogeton natans, P. epihydrus, P. pulcher, P. pusillus, an Eleocharis sp., Vallisneria americana, Utricularia vulgaris and U. purpurea also were found.  Patches of P. bicupulatus and Najas guadalupensis were found near the boat launch. Deeper water in the middle of the pond was occupied by Cabomba caroliniana. 

Find Common Plant Names

(65 KB, .pdf format*)

Species recorded in our 2004 survey of Holbrook Pond. Click on plant to view herbarium mount. (invasive species in bold).

SUBMERGED SPECIES

Cabomba caroliniana

Ceratophyllum echinatum

Eleocharis sp.

Elodea canadensis

Myriophyllum heterophyllum X laxum

Najas gracillima

Najas guadalupensis

Potamogeton bicupulatus

Potamogeton crispus

Potamogeton epihydrus

Potamogeton natans

Potamogeton pulcher

Potamogeton pusillus

Potamogeton robbinsii

Utricularia gibba

Utricularia minor

Utricularia purpurea

Utricularia radiata

Utricularia vulgaris

Vallisneria americana

FLOATING-LEAVED SPECIES

Brasenia schreberi

Nuphar variegata

Nymphaea odorata


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