Ecological Survey of Cibolo Creek at Jacob's Crossing, Cibolo Nature Center, (1/3/2108)

On Wednesday, January 3rd, I took a limited sampling of aquatic invertebrates, several fish, and flying insects. I will expand on this in the near future.

Aerial net was swept at a height of 1-8 feet above the surface of the water over an area of roughly 1000 square feet for a total of about 10 minutes.

Dip net used with kick method in very shallow riffle below water ford at Jacob's Crossing for roughly 10 minutes. Incidentally captured one male Orangethroat Darter.

Dip net was used to sweep through aquatic vegetation in slower, deeper pools and kicked-up leafpacks for total of roughly 10 minutes.

Samples collected from riffle and from pools were kept separate.

Preliminary observations:

Midge larvae were present in both riffle and pools, but were remarkably abundant in pools. Midges seemed to be the predominant taxa, followed closely by small mayflies.

Amphipods were notably absent.

Two apparently different net-spinning caddisfly taxa were abundant in the riffle, more so than in other localities in the Boerne area sampled so far.

Posted on January 08, 2018 03:18 AM by mattgeo1990 mattgeo1990

Observations

Photos / Sounds

What

Orangethroat Darter (Etheostoma spectabile)

Observer

mattgeo1990

Date

January 3, 2018 05:55 PM CST

Description

Healthy and prompt release after observation

Photos / Sounds

What

Dancers (Genus Argia)

Observer

mattgeo1990

Date

January 3, 2018 07:17 PM CST

Description

Collected from fast, shallow riffle.

Photos / Sounds

What

Net-spinning Caddisflies (Family Hydropsychidae)

Observer

mattgeo1990

Date

January 3, 2018 07:23 PM CST

Description

Collected from fast, shallow riffle.

Photos / Sounds

What

Net-spinning Caddisflies (Family Hydropsychidae)

Observer

mattgeo1990

Date

January 3, 2018 07:25 PM CST

Description

Collected from fast, shallow riffle.

Photos / Sounds

What

Dancers (Genus Argia)

Observer

mattgeo1990

Date

January 3, 2018 07:32 PM CST

Description

Collected from fast, shallow riffle.

Photos / Sounds

Observer

mattgeo1990

Date

January 3, 2018 07:41 PM CST

Description

Collected from fast, shallow riffle.

Photos / Sounds

What

Mayflies (Order Ephemeroptera)

Observer

mattgeo1990

Date

January 3, 2018 07:44 PM CST

Description

Collected from fast, shallow riffle.

Photos / Sounds

What

Mayflies (Order Ephemeroptera)

Observer

mattgeo1990

Date

January 3, 2018 07:46 PM CST

Description

Collected from fast, shallow riffle.

Photos / Sounds

What

Narrow-winged Damselflies (Family Coenagrionidae)

Observer

mattgeo1990

Date

January 3, 2018 07:52 PM CST

Description

Leafpack, slow pool.

Photos / Sounds

What

Emerald Dragonflies (Family Corduliidae)

Observer

mattgeo1990

Date

January 3, 2018 07:54 PM CST

Description

Leafpack, slow pool.

Photos / Sounds

What

Mayflies (Order Ephemeroptera)

Observer

mattgeo1990

Date

January 3, 2018 08:05 PM CST

Description

Leafpack, slow pool.

Photos / Sounds

What

Skimmers (Family Libellulidae)

Observer

mattgeo1990

Date

January 3, 2018 08:08 PM CST

Description

Leaf pack, slow pool.

Photos / Sounds

Observer

mattgeo1990

Date

January 3, 2018 05:30 PM CST

Description

Captured at Cibolo Creek at dusk. Grid is 5x5mm

Photos / Sounds

Observer

mattgeo1990

Date

January 3, 2018 09:33 PM CST

Description

Captured at Cibolo Creek at dusk. Grid is 5x5mm

Photos / Sounds

Observer

mattgeo1990

Date

January 3, 2018 05:36 PM CST

Description

Captured at Cibolo Creek at dusk. Grid is 5x5mm

Photos / Sounds

Observer

mattgeo1990

Date

January 3, 2018 05:39 PM CST

Description

Captured at Cibolo Creek at dusk. Grid is 5x5mm

Photos / Sounds

What

Dancers (Genus Argia)

Observer

mattgeo1990

Date

January 3, 2018 08:12 PM CST

Photos / Sounds

What

Bladder Snails (Family Physidae)

Observer

mattgeo1990

Date

January 3, 2018 08:14 PM CST

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